iOS 绘制 cell --- 新手学习笔记。

1.Animal.h 文件中

#import @interface Animal : NSObject@property (strong, nonatomic) NSString *name;
@property (strong, nonatomic) NSString *detail;
@property (strong, nonatomic) NSString *imageName;
@end

2.Animal.m 文件中

#import "Animal.h"@implementation Animal@end

3.创建一个cell继承UITableViewCell ------HRCell.h

#import @interface HRCell : UITableViewCell{
UIView *contentView;
}
- (void)drawContentView:(CGRect)rect;
@end

4.创建一个自定义的cell继承 ----HRCell 的 HRCustomCell .h 文件

#import "HRCell.h"@class Animal;
@interface HRCustomCell : HRCell@property (weak, nonatomic) NSString *nameText;
@property (weak, nonatomic) NSString *detailText;
@property (weak, nonatomic) NSString *imageName;
- (void)bindAnimal:(Animal *)animal;
@end

5.HRCustomCell.m 文件

#import "HRCustomCell.h"#import "Animal.h"#define rNameFontSize 18.0f#define rDetailFontSize 14.0fstatic UIFont *NameFont;
static UIFont *DetailFont;
@implementation HRCustomCell+ (void)initialize{
NameFont = [UIFont fontWithName:@"American Typewriter" size:rNameFontSize];
DetailFont = [UIFont fontWithName:@"American Typewriter" size:rDetailFontSize];
}
- (void)bindAnimal:(Animal *)animal{
if (_nameText != animal.name) {
_nameText = animal.name;
}
if (_detailText != animal.detail) {
_detailText = animal.detail;
}
if (_imageName != animal.imageName) {
_imageName = animal.imageName;
}
[self setNeedsDisplay];
}
- (void)drawContentView:(CGRect)rect{
static UIColor *nameColor;
nameColor = [UIColor blackColor];
static UIColor *detailColor;
detailColor = [UIColor darkGrayColor];
CGContextRef context = UIGraphicsGetCurrentContext();
CGRect cellRect = self.frame;
if (self.highlighted || self.selected) {
CGContextSetFillColorWithColor(context, [UIColor lightGrayColor].CGColor);
CGContextFillRect(context, CGRectMake(0, 0, cellRect.size.width, cellRect.size.height));
}
else {
CGContextSetFillColorWithColor(context, [UIColor whiteColor].CGColor);
CGContextFillRect(context, CGRectMake(0, 0, cellRect.size.width, cellRect.size.height));
}
UIImage *image = [UIImage imageNamed:_imageName];
[image drawInRect:CGRectMake(5, 5, 50, 50)];
[nameColor set];
[_nameText drawAtPoint:CGPointMake(65, 10) forWidth:200 withFont:NameFont fontSize:rNameFontSize lineBreakMode:NSLineBreakByWordWrapping baselineAdjustment:UIBaselineAdjustmentAlignBaselines];
[detailColor set];
[_detailText drawAtPoint:CGPointMake(180, 40) forWidth:120 withFont:DetailFont fontSize:rDetailFontSize lineBreakMode:NSLineBreakByWordWrapping baselineAdjustment:UIBaselineAdjustmentAlignBaselines];
}

6.控制器中的.h 文件

#import @interface ViewController : UITableViewController@end

7.控制器中的.m文件

#import "ViewController.h"#import "Animal.h"#import "HRCustomCell.h"#define rAnimalCount 100#define rRowHeight 60@interface ViewController (){
NSMutableArray *_animalList;
}
@endstatic NSString * const CellIdentifier = @"HRCell";
@implementation ViewController- (void)loadAnimals{
_animalList = [NSMutableArray arrayWithCapacity:rAnimalCount];
for (NSInteger i = 0;
i < rAnimalCount;
i++) {
Animal *animal = [[Animal alloc] init];
NSString *name = [NSString stringWithFormat:@"Animal-%03d", i+1];
NSString *detail = [NSString stringWithFormat:@"dog or cat?"];
NSInteger seed = arc4random()%8 + 1;
NSString *imageName = [NSString stringWithFormat:@"head%02d", seed+1];
animal.name = name;
animal.detail = detail;
animal.imageName = imageName;
[_animalList addObject:animal];
}
}
- (void)viewDidLoad{
[super viewDidLoad];
[self loadAnimals];
[self.tableView registerClass:[HRCustomCell class] forCellReuseIdentifier:CellIdentifier];
self.title = @"Animals";
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
return rRowHeight;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return _animalList.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
HRCustomCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
[cell bindAnimal:_animalList[indexPath.row]];
return cell;
}
@end