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iOS 生成图片验证码绘制实例代码
类别:IOS编程/Objective-C   作者:码皇   来源:互联网   点击:

本篇文章主要介绍了iOS 图片验证码绘制实例代码,小编觉得挺不错的,现在分享给大家,也给大家做个参考。一起跟随小编过来看看吧

登录注册时用的验证码效果图


ViewDidload调用即可

    _pooCodeView = [[PooCodeView alloc] initWithFrame:CGRectMake(50, 100, 82, 32)];
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapClick:)];
    [_pooCodeView addGestureRecognizer:tap];
    [self.view addSubview:_pooCodeView];
    #import <UIKit/UIKit.h>@interface PooCodeView : UIView@property (nonatomic, retain) NSArray *changeArray;
    @property (nonatomic, retain) NSMutableString *changeString;
    @property (nonatomic, retain) UILabel *codeLabel;
    -(void)changeCode;
    @end#import "PooCodeView.h"@implementation PooCodeView@synthesize changeArray = _changeArray;
    @synthesize changeString = _changeString;
    @synthesize codeLabel = _codeLabel;
    - (id)initWithFrame:(CGRect)frame{
    self = [super initWithFrame:frame];
    if (self) {
    // Initialization code// self.layer.cornerRadius = 5.0;
    // self.layer.masksToBounds = YES;
    float red = arc4random() % 100 / 100.0;
    float green = arc4random() % 100 / 100.0;
    float blue = arc4random() % 100 / 100.0;
    UIColor *color = [UIColor colorWithRed:red green:green blue:blue alpha:0.2];
    self.backgroundColor = color;
    [self change];
    }
    return self;
    }
    //-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event//{
    // [self change];
    // [self setNeedsDisplay];
    //}
    -(void)changeCode{
    [self change];
    [self setNeedsDisplay];
    }
    - (void)change {
    self.changeArray = [[NSArray alloc] initWithObjects:@"0",@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"A",@"B",@"C",@"D",@"E",@"F",@"G",@"H",@"I",@"J",@"K",@"L",@"M",@"N",@"O",@"P",@"Q",@"R",@"S",@"T",@"U",@"V",@"W",@"X",@"Y",@"Z",@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",@"i",@"j",@"k",@"l",@"m",@"n",@"o",@"p",@"q",@"r",@"s",@"t",@"u",@"v",@"w",@"x",@"y",@"z",nil];
    NSMutableString *getStr = [[NSMutableString alloc] initWithCapacity:5];
    self.changeString = [[NSMutableString alloc] initWithCapacity:6];
    for(NSInteger i = 0;
    i < 4;
    i++) {
    NSInteger index = arc4random() % ([self.changeArray count] - 1);
    getStr = [self.changeArray objectAtIndex:index];
    self.changeString = (NSMutableString *)[self.changeString stringByAppendingString:getStr];
    }
    }
    - (void)drawRect:(CGRect)rect {
    [super drawRect:rect];
    float red = arc4random() % 100 / 100.0;
    float green = arc4random() % 100 / 100.0;
    float blue = arc4random() % 100 / 100.0;
    UIColor *color = [UIColor colorWithRed:red green:green blue:blue alpha:0.5];
    [self setBackgroundColor:color];
    NSString *text = [NSString stringWithFormat:@"%@",self.changeString];
    CGSize cSize = [@"S" sizeWithFont:[UIFont systemFontOfSize:20]];
    int width = rect.size.width / text.length - cSize.width;
    int height = rect.size.height - cSize.height;
    CGPoint point;
    float pX, pY;
    for (int i = 0;
    i < text.length;
    i++) {
    pX = arc4random() % width + rect.size.width / text.length * i;
    pY = arc4random() % height;
    point = CGPointMake(pX, pY);
    unichar c = [text characterAtIndex:i];
    NSString *textC = [NSString stringWithFormat:@"%C", c];
    [textC drawAtPoint:point withFont:[UIFont systemFontOfSize:20]];
    }
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetLineWidth(context, 1.0);
    for(int cout = 0;
    cout < 10;
    cout++) {
    red = arc4random() % 100 / 100.0;
    green = arc4random() % 100 / 100.0;
    blue = arc4random() % 100 / 100.0;
    color = [UIColor colorWithRed:red green:green blue:blue alpha:0.2];
    CGContextSetStrokeColorWithColor(context, [color CGColor]);
    pX = arc4random() % (int)rect.size.width;
    pY = arc4random() % (int)rect.size.height;
    CGContextMoveToPoint(context, pX, pY);
    pX = arc4random() % (int)rect.size.width;
    pY = arc4random() % (int)rect.size.height;
    CGContextAddLineToPoint(context, pX, pY);
    CGContextStrokePath(context);
    }
    }
    @end

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