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OC&&IOS开发小技巧总结
类别：IOS编程/Objective-C   作者：码皇   来源：清风飏     点击：

1 数组遍历的三种方式2 使用 [obj class]属性获得类名成,利用类名称创建对象3 给一个UIImageView 添加一个动画数组,可以设置动画时间,循环次数

1.数组遍历的三种方式

2. 使用 [obj class]属性获得类名成,利用类名称创建对象

3.给一个UIImageView 添加一个动画数组,可以设置动画时间,循环次数

4.利用[UIImage animatedImageNamed:@“” duration:]可以达到蝴蝶翩翩飞过,的效果,不过要开一个定时器,才能让图片横向的移动

5. 给Button设置背景图片,并且button的大小跟图片的大小一样大

6.用addViewController做类似于导航控制器的作用

7.打电话

 

8.给导航栏添加图片

 

9.生成二维码图片(包含链接),并且添加视图上

10.给一个View设置层的边框颜色,边框宽度,变的圆角,

 

11.给一个Lable添加NSAttributeString,包含设置字体,字的间距,字体的颜色,字体的大小

 

12获得改字符串的大小

 

13.一个视图控制器退出的时候,要隐藏系统的底部的导航栏

14.创建前后颜色不同的字符串  

15.给UITableView去掉分割线

16.给某个View的下方添加波浪线

 

17.获得IP地址及Mac地址   18.创建一个UIImageView,并且设置渐变色

19.设置UITableView的某个cell不可选

21.隐藏和现实导航栏,只管本视图控制器的navagationController的显示和隐藏,不影响其他的视图控制器

22.原生的给设置tabBarItem设置图片,字体,以及设置,文字和图片之间距离

 

23.给字符串添加下划线

24.给导航栏的标题设置文字的颜色,字体的大小

 

25,断网的判断及处理,要包含Reachability.h的头文件

 

25,断网的判断及处理,要包含Reachability.h的头文件

26.动态将UITableViewCell滚动到指定的cell

27.一段文字设置行间距

 

28.签到动画

29.给城市排序按照拼音

30.发邮件,打电话，发短信，打开网址

31.ios 判断app程序第一次启动方法

32.判断手机网络运营商

33 NSData同步请求网络数据

34view和window之间坐标转换

 

35.ViewController的生命周期

36程序启动原理

 

37.UITableViewCell 文字位置调整

38.ios带圆角图片的拉伸

39自定义UINavigtion

 

 

 

 

1.数组遍历的三种方式(for ,for in ,枚举器)

 
    int main(int argc, const char * argv[]){
    @autoreleasepool {
    //创建一个Car类,两个属性:名字,颜色 //创建3个对象,加到数组里 //输出数组 Car *car1 = [[Car alloc] initWithName:@"宝马汽车" andColor:'
    R'
    ];
    Car *car2 = [[Car alloc] initWithName:@"奔驰汽车" andColor:'
    B'
    ];
    Car *car3 = [[Car alloc] initWithName:@"奥迪汽车" andColor:'
    W'
    ];
    NSArray *array = [NSArray arrayWithObjects:car1,car2,car3, nil];
    //循环遍历数组 [[array objectAtIndex:0] setName:@"拖拉机"];
    // for(int i = 0;
    i < [array count];
    i++)// {
    // NSLog(@"%@",[array objectAtIndex:i]);
    // }
    //for in //快速遍历数组 //从前往后 完整遍历 //数组中有多种对象的时候用id //可变数组的时候,并且要改变数组长度的时候不要用 for(Car *obj in array) {
    NSLog(@"%@",obj);
    }
    //枚举器用来遍历数组 //- (NSEnumerator *)objectEnumerator;
    //1 2 3 4 5 6 //把数组的所有元素依次存放到枚举器 NSEnumerator *enumerator = [array objectEnumerator];
    enumerator = [array reverseObjectEnumerator];
    id obj = nil;
    while(obj = [enumerator nextObject]){
    NSLog(@"%@",obj);
    }
    while(obj = [enumerator nextObject]) {
    NSLog(@"%@",obj);
    }
    枚举器block [moduleArray enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
    }
    ];
    }
    return 0;
    }

2. 使用 [obj class]属性获得类名成,利用类名称创建对象

 

    #import #import "mybuton.h"int main(int argc, const char * argv[]){
    @autoreleasepool {
    mybuton*btn=[mybuton creatBtn:SJX];
    [btn showType];
    }
    return 0;
    }
    #import typedef enum{
    SJX, YX}
    BtnType;
    @interface mybuton : NSObject-(void)showType;
    +(instancetype)creatBtn:(BtnType)type;
    @end#import "mybuton.h"#import"mybuton_SJX.h"#import "mybuton_YX.h"@implementation mybuton-(void)showType{
    NSLog(@"我是一个按钮");
    }
    +(instancetype)creatBtn:(BtnType)type{
    Class myclass[]={
    [mybuton_SJX class],[mybuton_YX class]}
    ;
    mybuton*btn=[[myclass[type]alloc]init];
    return btn;
    }
    @end#import "mybuton.h"@interface mybuton_SJX : mybuton@end#import "mybuton_SJX.h"@implementation mybuton_SJX-(void)showType{
    NSLog(@"我是一个三角形按钮");
    }
    @end

 

3.给一个UIImageView 添加一个动画数组,可以设置动画时间,循环次数

 

    images = [NSArray arrayWithObjects: [UIImage imageNamed:@"1.jpg"], [UIImage imageNamed:@"2.jpg"], [UIImage imageNamed:@"3.jpg"], [UIImage imageNamed:@"4.jpg"], [UIImage imageNamed:@"5.jpg"], nil];
    // 设置iv控件需要动画显示的图片为images集合元素 self.iv.animationImages = images;
    // 设置动画持续时间 self.iv.animationDuration = 12;
    // 设置动画重复次数 self.iv.animationRepeatCount = 999999;
    // 让iv控件开始播放动画 [self.iv startAnimating];
    可以每隔2.4s动画,更新图片,循环99999次

4.利用[UIImage animatedImageNamed:@“” duration:]可以达到蝴蝶翩翩飞过,的效果,不过要开一个定时器,才能让图片横向的移动

 

    // 定义显示图片的UIImageView控件UIImageView* iv;
    // 定义定时器NSTimer* timer;
    - (void)viewDidLoad{
    [super viewDidLoad];
    // 设置背景色为白色 self.view.backgroundColor = [UIColor whiteColor];
    // 创建UIImageView控件 iv = [[UIImageView alloc] initWithFrame:CGRectMake(0 , 30 , 41 , 43)];
    // 使用UIImageView加载文件名以butterfly_f开头的多张图片 iv.image = [UIImage animatedImageNamed:@"butterfly_f" duration:0.6];
    // 将UIImageView添加到系统界面上 [self.view addSubview: iv];
    // 启动NSTimer定时器来改变UIImageView的位置 timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(changePos) userInfo:nil repeats:YES];
    }
    - (void) changePos{
    CGPoint curPos = iv.center;
    // 计算一个-4~5之间随机数 int y = arc4random() % 10 - 4;
    // 当curPos的x坐标已经超过了屏幕的宽度 if(curPos.x > [UIScreen mainScreen].bounds.size.width) {
    // 控制蝴蝶再次从屏幕左侧开始移动 iv.center = CGPointMake(0, 30);
    }
    else {
    // 通过修改iv的center属性来改变iv控件的位置 iv.center = CGPointMake(curPos.x + 4, curPos.y + y);
    }
    }


 

5. 给Button设置背景图片,并且button的大小跟图片的大小一样大

 

    UIImage* backImg = [UIImage imageNamed:@"back_white"];
    UIButton* btn = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, backImg.size.width, backImg.size.height)];
    [btn addTarget:self action:@selector(backClick) forControlEvents:UIControlEventTouchUpInside];
    [btn setImage:backImg forState:UIControlStateNormal];
    //[btn setImage:backImg forState:UIControlStateHighlighted];
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:btn];

 

6.用addViewController做类似于导航控制器的作用

 

    ResultViewController *result = [[ResultViewController alloc] initWithNibName:@"ResultViewController" bundle:nil];
    [self.parentViewController addChildViewController:result];
    [self.parentViewController.view addSubview:result.view];
    result.view.frame = CGRectMake(WIDTH, 0, WIDTH, HEIGHT);
    [UIView animateWithDuration:0.3 delay:0.0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
    CATransition *animation = [CATransition animation];
    [animation setDuration:0.3];
    [animation setType:kCATransitionPush];
    [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
    [animation setSubtype:kCATransitionFromRight];
    [self.navigationController.view.layer addAnimation:animation forKey:nil];
    result.view.frame = CGRectMake(0, 0, WIDTH, HEIGHT);
    }
    completion:^(BOOL finished) {
    }
    ];


 

7.打电话

 

如果是飞行模式,手机系统会弹出是否停用飞行模式

如果没有卡,也会提示

如果有卡,并且不是飞行模式,程序会自动进入后台,前台会弹出拨号的界面

 

    #pragma mark - 打电话- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
    NSLog(@"打电话");
    if (buttonIndex==0) {
    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:@"tel://%@",@"4008-230-950"]]];
    }
    }


 

8.给导航栏添加图片

 

    UIImageView *imageView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, ViewWidth*0.3, 22)];
    imageView.image=[UIImage imageNamed:@"tapmoney"];
    self.navigationItem.titleView=imageView;


 

9.生成二维码图片(包含链接),并且添加视图上

前提是要导入ZBar.h和QRCodeGenerator.h头文件

 

    UIImageView *twoDimensionCode=[WNController createImageViewWithFrame:CGRectMake(ViewWidth*0.2, ViewHeight*0.02, ViewWidth*0.5, ViewHeight*0.20) ImageName:nil];
    twoDimensionCode.image=[QRCodeGenerator qrImageForString:@"www.baidu.com" imageSize:400];
    [view addSubview:twoDimensionCode];


 

10.给一个View设置层的边框颜色,边框宽度,变的圆角,

 

    UIView *view=[[UIView alloc]initWithFrame:CGRectMake(ViewWidth*0.05, 10, ViewWidth*0.9, ViewHeight*0.4)];
    view.layer.borderColor=[[UIColor blackColor]CGColor];
    view.layer.borderWidth=0.5;
    view.layer.cornerRadius=5;
    view.layer.masksToBounds=YES;
    [self.view addSubview:view];


 

 

11.给一个Lable添加NSAttributeString,包含设置字体,字的间距,字体的颜色,字体的大小

 

    NSAttributedString *attriStrTodayEarn =[[NSAttributedString alloc] initWithString:@"Today'
    s earn" attributes:@{
    NSForegroundColorAttributeName : [UIColor whiteColor],NSKernAttributeName : @(-1.3f),NSFontAttributeName:[UIFont fontWithName:@"Gill Sans" size:1.8*NormalFont]}
    ];
    [todayEarn setAttributedText:attriStrTodayEarn];


 

12获得改字符串的大小

 

    CGSize size=[middleLabel.text boundingRectWithSize:CGSizeMake(ViewWidth*0.7,NormalFont*3) options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading attributes:@{
    NSFontAttributeName:middleLabel.font}
    context:nil].size;

13.一个视图控制器退出的时候,要隐藏系统的底部的导航栏

vc.hidesBottomBarWhenPushed=YES;

14.创建前后颜色不同的字符串
    - (NSMutableAttributedString *)createAttributeStringWithStr:(NSString *)foreString withStr:(NSString *)afterString{
    NSString * joinstr = foreString;
    NSString * text = afterString;
    NSString *jointext = [NSString stringWithFormat:@"%@%@",joinstr,text];
    NSDictionary *textDic = @{
    NSForegroundColorAttributeName:[UIColor colorWithRed:0.13f green:0.65f blue:0.00f alpha:1.00f],NSFontAttributeName:[UIFont systemFontOfSize:NormalFont ]}
    ;
    NSMutableAttributedString *attributeString = [[NSMutableAttributedString alloc]initWithString:jointext];
    [attributeString addAttributes:textDic range:NSMakeRange(joinstr.length, text.length)];
    return attributeString;
    //本质是NSMutableAttributedString 给一定范围的字符做颜色属性的改变}

15.给UITableView去掉分割线

_tableView.separatorStyle=UITableViewCellSeparatorStyleNone;

cell.selectionStyle=UITableViewCellSelectionStyleNone;

16.给某个View的下方添加波浪线

 

    -(void)drawRect:(CGRect)rect{
    CGRect frame=self.frame;
    CGFloat height=frame.size.height;
    // CGFloat width =frame.size.width;
    UIColor *color = [UIColor whiteColor];
    [color set];
    //设置线条颜 UIBezierPath* aPath = [UIBezierPath bezierPath];
    aPath.lineWidth = 0.5;
    aPath.lineCapStyle = kCGLineCapRound;
    //线条拐角 aPath.lineJoinStyle = kCGLineCapRound;
    //终点处理 aPath.lineCapStyle = kCGLineCapRound;
    //线条拐角 aPath.lineJoinStyle = kCGLineCapRound;
    //终点处理 for (int i=0;
    i<50;
    ++i) {
    [aPath moveToPoint:CGPointMake(0+frame.size.width/50*i, height)];
    [aPath addQuadCurveToPoint:CGPointMake(frame.size.width/50*(i+1), height) controlPoint:CGPointMake(frame.size.width/100+frame.size.width/50*i, height-5)];
    [aPath fill];
    }


 

17.获得IP地址及Mac地址 前提要包含
    #import #import #include #include #include #include +(NSString *)getMACAddress{
    int mib[6];
    size_t len;
    char *buf;
    unsigned char *ptr;
    struct if_msghdr *ifm;
    struct sockaddr_dl *sdl;
    mib[0] = CTL_NET;
    mib[1] = AF_ROUTE;
    mib[2] = 0;
    mib[3] = AF_LINK;
    mib[4] = NET_RT_IFLIST;
    if ((mib[5] = if_nametoindex("en0")) == 0) {
    printf("Error: if_nametoindex error/n");
    return NULL;
    }
    if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
    printf("Error: sysctl, take 1/n");
    return NULL;
    }
    if ((buf = malloc(len)) == NULL) {
    printf("Could not allocate memory. error!/n");
    return NULL;
    }
    if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
    printf("Error: sysctl, take 2");
    return NULL;
    }
    ifm = (struct if_msghdr *)buf;
    sdl = (struct sockaddr_dl *)(ifm + 1);
    ptr = (unsigned char *)LLADDR(sdl);
    NSString *outstring = [NSString stringWithFormat:@"%02x:%02x:%02x:%02x:%02x:%02x", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];
    free(buf);
    return [outstring uppercaseString];
    }
    +(NSString *)getIPAddress{
    NSString *address = @"error";
    struct ifaddrs *interfaces = NULL;
    struct ifaddrs *temp_addr = NULL;
    int success = 0;
    // retrieve the current interfaces - returns 0 on success success = getifaddrs(&interfaces);
    if (success == 0) {
    //Loop through linked list of interfaces temp_addr = interfaces;
    while(temp_addr != NULL) {
    if(temp_addr->ifa_addr->sa_family == AF_INET) {
    // Check if interface is en0 which is the wifi connection on the iPhone if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
    // Get NSString from C String address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
    }
    }
    temp_addr = temp_addr->ifa_next;
    }
    }
    // Free memory freeifaddrs(interfaces);
    return address;
    }

  18.创建一个UIImageView,并且设置渐变色
    +(UIImageView *)progressiveImageframe:(CGRect)frame beginColor:(CGFloat *)Bcomponent endColor:(CGFloat*)Ecomponent {
    UIImageView *imageView=[[UIImageView alloc]initWithFrame:frame];
    UIGraphicsBeginImageContext(imageView.frame.size);
    [imageView.image drawInRect:CGRectMake(0, 0, imageView.frame.size.width, imageView.frame.size.height)];
    CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
    //设置线条终点形状 CGContextRef context =UIGraphicsGetCurrentContext();
    CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
    // 创建起点颜色 (CGFloat[]){
    0, 0.61, 0.81, 1}
    (CGFloat[]){
    0.87, 0.61, 0, 1}
    CGColorRef beginColor = CGColorCreate(colorSpaceRef,Bcomponent );
    // 创建终点颜色 CGColorRef endColor = CGColorCreate(colorSpaceRef, Ecomponent);
    // 创建颜色数组 CFArrayRef colorArray = CFArrayCreate(kCFAllocatorDefault, (const void*[]){
    beginColor, endColor}
    , 2, nil);
    // 创建渐变对象 CGGradientRef gradientRef = CGGradientCreateWithColors(colorSpaceRef, colorArray, (CGFloat[]){
    0.0f, // 对应起点颜色位置 1.0f // 对应终点颜色位置 }
    );
    // 释放颜色数组 CFRelease(colorArray);
    // 释放起点和终点颜色 CGColorRelease(beginColor);
    CGColorRelease(endColor);
    // 释放色彩空间 CGColorSpaceRelease(colorSpaceRef);
    CGContextDrawLinearGradient(context, gradientRef, CGPointMake(0, 0), CGPointMake(0, frame.size.height), 0);
    CGGradientRelease(gradientRef);
    imageView.image=UIGraphicsGetImageFromCurrentImageContext();
    return imageView;
    }

 

19.设置UITableView的某个cell不可选

为了彻底避免UITableViewCell选择，让UITableViewDelegate实现tableView:willSelectRowAtIndexPath:。如果你不希望选中行，从那个函数可以返回nil

    - (NSIndexPath *)tableView:(UITableView *)tv willSelectRowAtIndexPath:(NSIndexPath *)path{
    //根据 NSIndexPath判定行是否可选。 if (rowIsSelectable) {
    returnpath;
    }
    returnnil;
    }

  20.自定义一个CustomView给一个UIImageView添加一个点击的block

 

    #import @interface CustomImageView : UIImageView@property(nonatomic,copy)void(^touchImage)();
    @end#import "CustomImageView.h"@implementation CustomImageView- (id)initWithFrame:(CGRect)frame{
    self = [super initWithFrame:frame];
    if (self) {
    self.userInteractionEnabled=YES;
    }
    return self;
    }
    -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    if (self.touchImage) {
    self.touchImage();
    }
    }
    @end


 

21.隐藏和现实导航栏,只管本视图控制器的navagationController的显示和隐藏,不影响其他的视图控制器
    -(void)viewWillAppear:(BOOL)animated{
    [super viewDidAppear:YES];
    self.navigationController.navigationBarHidden=YES;
    }
    -(void)viewWillDisappear:(BOOL)animated{
    self.navigationController.navigationBarHidden=NO;
    }

 

22.原生的给设置tabBarItem设置图片,字体,以及设置,文字和图片之间距离

 

    nc.tabBarItem = [[UITabBarItem alloc]initWithTitle:titles[i] image:[[UIImage imageNamed:imageArr[i]] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal] selectedImage:[[UIImage imageNamed:selectedImageArr[i]] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];
    [nc.tabBarItem setTitlePositionAdjustment:UIOffsetMake(0, -4)];
    [[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor lightGrayColor], NSForegroundColorAttributeName,[UIFont systemFontOfSize:SmallFont*0.9] ,NSFontAttributeName,nil] forState:UIControlStateNormal];
    [[UITabBarItem appearance] setTitleTextAttributes: [NSDictionary dictionaryWithObjectsAndKeys:[UIColor orangeColor],NSForegroundColorAttributeName, nil]forState:UIControlStateSelected];


 

23.给字符串添加下划线

 

    UILabel * standardF = [self createSingleLabelWithFrame:CGRectMake(space*4, CGRectGetMaxY(standard.frame)+space, ViewWidth-space*4, space*3) withAttributedString:@"亚马逊礼品卡使用协议"];
    [self.view addSubview:standardF];
    UILabel * standardW = [self createSingleLabelWithFrame:CGRectMake(space*4, CGRectGetMaxY(standardF.frame), ViewWidth-space*4, space*3) withAttributedString: @"个人资料隐私及保护协议"];
    [self.view addSubview:standardW];
    }
    - (UILabel *)createSingleLabelWithFrame:(CGRect)frame withAttributedString:(NSString *)text{
    NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc]initWithString:text];
    [attributedStr addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:NSMakeRange(0, attributedStr.length)];
    UILabel *label = [WNController createLabelWithFrame:frame Font:NormalFont Text:nil];
    label.attributedText = attributedStr;
    label.textColor = [UIColor orangeColor];
    return label;
    }

 

  24.给导航栏的标题设置文字的颜色,字体的大小

 

    self.title = @"检查新版本";
    //标题栏 [[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"topback.png"] forBarMetrics:UIBarMetricsDefault];
    NSDictionary *navbarTitleTextAttributes = [NSDictionary dictionaryWithObjectsAndKeys:KDefaultTitleViewTitleColor, NSForegroundColorAttributeName, KDefaultTitleViewTitleFont, NSFontAttributeName, nil];
    [[UINavigationBar appearance] setTitleTextAttributes:navbarTitleTextAttributes]


 

25,断网的判断及处理,要包含Reachability.h的头文件

 

    Reachability *reach = [Reachability reachabilityWithHostName:@"www.baidu.com"];
    NetworkStatus status = [reach currentReachabilityStatus];
    if (status == NotReachable) {
    //没有连接到网络就弹出提实况 [[[UIAlertView alloc] initWithTitle:@"提示" message:@"网络连接失败,请稍后再试!" delegate:nil cancelButtonTitle:@"确认" otherButtonTitles:nil, nil] show];
    return;
    }


 

26.动态将UITableViewCell滚动到指定的cell

  [_tableViewscrollToRowAtIndexPath:[NSIndexPathindexPathForRow:_messageArray.count-1inSection:0]atScrollPosition:UITableViewScrollPositionNoneanimated:YES];   27.一段文字设置行间距 commentLabel.textColor=UIColorFromRGB(0x333333,1.0);

//设置行间距

NSMutableAttributedString*attributedString = [[NSMutableAttributedStringalloc]initWithString:commentLabel.text];

NSMutableParagraphStyle*paragraphStyle = [[NSMutableParagraphStylealloc]init];

[paragraphStylesetLineSpacing:lineSpace];

[attributedStringaddAttribute:NSParagraphStyleAttributeNamevalue:paragraphStylerange:NSMakeRange(0, [attributedStringlength])];

//设置昵称颜色为橘黄色

28.签到动画

 

    -(void)reallyStartAnimation{
    if ( !self.isCheckingIn ) {
    self.checkImageView.image = [UIImage imageNamed:@"checkin-2"];
    [self.checkBtn setTitle:@"签到中.." forState:UIControlStateNormal];
    [self startAnimation];
    self.isCheckingIn = YES;
    }
    }
    -(void) startAnimation{
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.01];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDidStopSelector:@selector(endAnimation)];
    self.checkImageView.transform = CGAffineTransformMakeRotation(self.angle * (M_PI / 180.0f));
    [UIView commitAnimations];
    }
    -(void)endAnimation{
    self.angle += 10;
    [self startAnimation];
    }


 

29.给城市排序安装拼音

 

    -(void)buildUpFirstLetterDictionary{
    self.citySortedCommunityDic = [[NSMutableDictionary alloc] initWithCapacity:16];
    self.citySortedHeaderTitleIndexDic = [[NSMutableDictionary alloc] initWithCapacity:16];
    for (City* city in self.cityDataSource.citys) {
    NSMutableArray* originalCommunityArray = [[NSMutableArray alloc] initWithCapacity:16];
    for ( Community* community in city.communitys.communitys ) {
    [originalCommunityArray addObject:community.name];
    }
    NSDictionary* dic = [originalCommunityArray sortedArrayUsingFirstLetter];
    [self.citySortedCommunityDic setObject:dic forKey:city.name];
    //因为字典的无序，将所有的key取出来之后，重新输出 NSArray *keys = [[dic allKeys] sortedArrayUsingSelector:@selector(compare:)];
    [self.citySortedHeaderTitleIndexDic setObject:keys forKey:city.name];
    }
    }
    ///// #import "NSArray+FirstLetterArray.h"#import "pinyin.h"@implementation NSArray (FirstLetterArray)- (NSDictionary *)sortedArrayUsingFirstLetter{
    NSMutableDictionary *mutDic = [NSMutableDictionary dictionary];
    const char *letterPoint = NULL;
    NSString *firstLetter = nil;
    for (NSString *str in self) {
    //检查 str 是不是 NSString 类型 if (![str isKindOfClass:[NSString class]]) {
    assert(@"object in array is not NSString");
    #ifdef DEBUG NSLog(@"object in array is not NSString, it'
    s [%@]", NSStringFromClass([str class]));
    #endif continue;
    }
    letterPoint = [str UTF8String];
    //如果开头不是大小写字母则读取 首字符 if (!(*letterPoint > '
    a'
    && *letterPoint < '
    z'
    ) && !(*letterPoint > '
    A'
    && *letterPoint < '
    Z'
    )) {
    //汉字或其它字符 char letter = pinyinFirstLetter([str characterAtIndex:0]);
    letterPoint = &letter;
    }
    //首字母转成大写 firstLetter = [[NSString stringWithFormat:@"%c", *letterPoint] uppercaseString];
    //首字母所对应的 姓名列表 NSMutableArray *mutArray = [mutDic objectForKey:firstLetter];
    if (mutArray == nil) {
    mutArray = [NSMutableArray array];
    [mutDic setObject:mutArray forKey:firstLetter];
    }
    [mutArray addObject:str];
    }
    //字典是无序的，数组是有序的， //将数组排序 for (NSString *key in [mutDic allKeys]) {
    NSArray *nameArray = [[mutDic objectForKey:key] sortedArrayUsingSelector:@selector(compare:)];
    [mutDic setValue:nameArray forKey:key];
    }
    return mutDic;
    }
    @end

 

30.发邮件,打电话，发短信，打开网址
    30.1、调用 自带mail[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"mailto://admin@hzlzh.com”
    ]];
    30.2、调用 电话phone[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel://8008808888"]];
    iOS应用内拨打电话结束后返回应用一般在应用中拨打电话的方式是：[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel://123456789"]];
    使用这种方式拨打电话时，当用户结束通话后，iphone界面会停留在电话界面。用如下方式，可以使得用户结束通话后自动返回到应用：UIWebView*callWebview =[[UIWebView alloc] init];
    NSURL *telURL =[NSURL URLWithString:@"tel:10086"];
    // 貌似tel:// 或者 tel: 都行[callWebview loadRequest:[NSURLRequest requestWithURL:telURL]];
    //记得添加到view上[self.view addSubview:callWebview];
    　还有一种私有方法：（可能不能通过审核）[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"telprompt://10086"]];
    30.3、调用 SMS[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"sms://800888"]];
    30.4、调用自带 浏览器 safari[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://www.hzlzh.com"]];
    调用phone可以传递号码，调用SMS 只能设定号码，不能初始化SMS内容。若需要传递内容可以做如下操作：加入：MessageUI.framework#import 实现代理：MFMessageComposeViewControllerDelegate调用sendSMS函数//内容，收件人列表- (void)sendSMS:(NSString *)bodyOfMessage recipientList:(NSArray *)recipients{
    MFMessageComposeViewController *controller = [[[MFMessageComposeViewController alloc] init] autorelease];
    if([MFMessageComposeViewController canSendText]) {
    controller.body = bodyOfMessage;
    controller.recipients = recipients;
    controller.messageComposeDelegate = self;
    [self presentModalViewController:controller animated:YES];
    }
    }
    // 处理发送完的响应结果- (void)messageComposeViewController:(MFMessageComposeViewController *)controller didFinishWithResult:(MessageComposeResult)result{
    [self dismissModalViewControllerAnimated:YES];
    if (result == MessageComposeResultCancelled) NSLog(@"Message cancelled") else if (result == MessageComposeResultSent) NSLog(@"Message sent") else NSLog(@"Message failed") }
    默认发送短信的界面为英文的，解决办法为：在.xib 中的Localization添加一組chinese就ok了

31.ios 判断app程序第一次启动方法

 

    if(![[NSUserDefaults standardUserDefaults] boolForKey:@"firstStart"]){
    [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"firstStart"];
    NSLog(@"第一次启动");
    }
    else{
    NSLog(@"不是第一次启动");
    }
32.判断手机运营商

 

    - (BOOL)checkChinaMobile{
    BOOL ret = NO;
    CTTelephonyNetworkInfo *info = [[CTTelephonyNetworkInfo alloc] init];
    CTCarrier *carrier = [info subscriberCellularProvider];
    if (carrier == nil) {
    [info release];
    return NO;
    }
    NSString *code = [carrier mobileNetworkCode];
    if (code == nil) {
    [info release];
    return NO;
    }
    if ([code isEqualToString:@"00"] || [code isEqualToString:@"02"] || [code isEqualToString:@"07"]) {
    ret = YES;
    }
    [info release];
    return ret;
    }


 

 

其它网络判断参考下表：

MCC MNC Brand Operator Status Bands (MHz) References and notes
460 00 China Mobile China Mobile Operational GSM 900 / GSM 1800 / TD-SCDMA 1880 / TD-SCDMA 2010
460 01 China Unicom China Unicom Operational GSM 900 / GSM 1800 / UMTS 2100 CDMA network sold toChina Telecom, WCDMA commercial trial started in May 2009 and in full commercial operation as of October 2009.
460 02 China Mobile China Mobile Operational GSM 900 / GSM 1800 / TD-SCDMA 1880 / TD-SCDMA 2010  
460 03 China Telecom China Telecom Operational CDMA2000 800 / CDMA2000 2100 EV-DO
460 05 China Telecom China Telecom Operational    
460 06 China Unicom China Unicom Operational GSM 900 / GSM 1800 / UMTS 2100  
460 07 China Mobile China Mobile Operational GSM 900 / GSM 1800 / TD-SCDMA 1880 / TD-SCDMA 010  
460 20 China Tietong China Tietong Operational GSM-R

33 NSData同步请求网络数据

 

    + (id)dataWithContentsOfURL:(NSURL *)url;
    + (id)dataWithContentsOfURL:(NSURL *)url options:(NSDataReadingOptions)readOptionsMask error:(NSError **)errorPtr;
    其中NSDataReadingOptions可以附加一个参数。NSDataReadingMappedIfSaf e参数。使用这个参数后，iOS就不会把整个文件全部读取的内存了，而是将文件映射到进程的地址空间中，这么做并不会占用实际内存。这样就可以解决内存满的问题。补充：url包含中文时，直接使用会出错，需要如下转换 NSURL *url = [NSURL URLWithString:[self.curTaskData.urlstringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];

 

 

34view和window之间坐标转换

 

在某UIView子函数内部，将centerPoint从子view坐标转换成appDelegate.window内的坐标：

CGPointcenterPoint = [selfgetCenterPointByCurPressPoint:pressPointer];

centerPoint = [selfconvertPoint:centerPointtoView:appDelegate.window];

 

 

35.ViewController的生命周期

loadView和viewDidLoad的区别就是，loadView时view还没有生成，viewDidLoad时，view已经生成了，loadView只会被调用一次，而viewDidLoad可能会被调用多次（View可能会被多次加载），当view被添加到其他view中之前，会调用viewWillAppear，之后会调用viewDidAppear。当view从其他view中移除之前，调用viewWillDisAppear，移除之后会调用viewDidDisappear。当view不再使用时，受到内存警告时，ViewController会将view释放并将其指向为nil。

ViewController的生命周期中各方法执行流程如下：

init—>loadView—>viewDidLoad—>viewWillApper—>viewDidApper—>viewWillDisapper—>viewDidDisapper—>viewWillUnload->viewDidUnload—>dealloc

 

36程序启动原理

UIApplication和delegate

 

所有的移动操作系统都有个致命的缺点:app很容易受到打扰.比如一个来电或者锁屏会导致app进入后台甚至被终止;

还有很多其他类似的情况会导致app受到干扰,在app受到干扰时,会产生一些系统事件,这时UIApplication会通知它的delegate对象,让delegate来处理这些系统事件.

delegate可处理的事件包括:

1> 应用程序的生命周期事件(如程序的启动和关闭);

2> 系统事件(如来电);

3> 内存警告...

UIWindow的获得:

?
1 [UIApplicationsharedApplication].windows

 

在本应用中打开的UIWindow列表,这样就可以接触应用中的任何一个UIView对象(平时输入文字弹出的键盘,就处在一个新的UIWindow中).

?
1 [UIApplicationsharedApplication].keyWindow

 

用来接收键盘以及非触摸类的消息事件的UIWindow,而且程序中每时每刻只能有一个UIWindow是keyWindow.如果某个UIWindow内部的文本框不能输入文字,可能是因为这个UIWindow不是keyWindow.

?
1 view.window

 

获得某个UIView所在的UIWindow.

 

 

37.UITableViewCell 文字位置调整 继承UITableViewCell，然后实现layoutSubviews函数，如下代码把textlabel下移了10个像素：

- (void) layoutSubviews

{

[superlayoutSubviews];

 

intcellHeight =self.frame.size.height;

intcellWidth =self.frame.size.width;

self.textLabel.frame=CGRectMake(0,10,cellWidth, cellHeight-10);

}

38.ios带圆角图片的拉伸

UIImage* aImage =[[UIImageimageNamed:@"xxx.png"]stretchableImageWithLeftCapWidth:3topCapHeight:3];

原图边框内的3个像素不拉伸，中间部分按需要拉伸，可以保持圆角不被破坏

39自定义UINavigtion

 

    1如果只是要更改left button 或者right button 的背景颜色：UINavigationBar* aNavigationBar = self.navigationController.navigationBar;
    aNavigationBar.tintColor = [UIColor lightGrayColor];
    2，如果要自定义left button 或者right button 的背景图片：UIButton* backButton = [customNavigationBar backButtonWith:[UIImage imageNamed:@"navigationBarBackButton.png"] highlight:nilleftCapWidth:14.0];
    backButton.titleLabel.textColor = [UIColor colorWithRed:254.0/255.0 green:239.0/255.0 blue:218.0/225.0 alpha:0.5];
    self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithCustomView:backButton] autorelease];
    3,如果要自定义navigation整个的背景图片：1，自定义navigationbar，然后在这个自定义类中实现如下函数- (void)drawRect:(CGRect)rect{
    if (navigationBarBackgroundImage) [navigationBarBackgroundImage drawInRect:rect];
    else [super drawRect:rect];
    ，如果只是要更改left button 或者right button 的背景颜色：UINavigationBar* aNavigationBar = self.navigationController.navigationBar;
    aNavigationBar.tintColor = [UIColor lightGrayColor];
    2，如果要自定义left button 或者right button 的背景图片：UIButton* backButton = [customNavigationBar backButtonWith:[UIImage imageNamed:@"navigationBarBackButton.png"] highlight:nilleftCapWidth:14.0];
    backButton.titleLabel.textColor = [UIColor colorWithRed:254.0/255.0 green:239.0/255.0 blue:218.0/225.0 alpha:0.5];
    self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithCustomView:backButton] autorelease];
    3,如果要自定义navigation整个的背景图片：1，自定义navigationbar，然后在这个自定义类中实现如下函数- (void)drawRect:(CGRect)rect{
    if (navigationBarBackgroundImage) [navigationBarBackgroundImage drawInRect:rect];
    else [super drawRect:rect];


 


 

 

 

 

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