UILabel教程

为了实例化咱们的Label时必须做点啥.. 先来个协议.
.h文件

复制代码 #import @class MyLabel; @protocol MyLabelDelegate @required - (void)myLabel:(MyLabel *)myLabel touchesWtihTag:(NSInteger)tag; @end

新建类,继承UILabel.

复制代码 @interface MyLabel : UILabel {     id delegate; } @property (nonatomic, assign) id delegate; - (id)initWithFrame:(CGRect)frame; @end

.m文件

复制代码 #import "MyLabel.h" #define FONTSIZE 13 #define COLOR(R,G,B,A) [UIColor colorWithRed:R/255.0 green:G/255.0 blue:B/255.0 alpha:A] @implementation MyLabel @synthesize delegate; // 设置换行模式,字体大小,背景色,文字颜色,开启与用户交互功能,设置label行数,0为不限制 - (id)initWithFrame:(CGRect)frame {     if (self = [super initWithFrame:frame])     {         [self setLineBreakMode:UILineBreakModeWordWrap|UILineBreakModeTailTruncation];         [self setFont:[UIFont systemFontOfSize:FONTSIZE]];         [self setBackgroundColor:[UIColor clearColor]];         [self setTextColor:COLOR(59,136,195,1.0)];         [self setUserInteractionEnabled:YES];         [self setNumberOfLines:0];     }     return self; } // 点击该label的时候, 来个高亮显示 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {     [self setTextColor:[UIColor whiteColor]]; } // 还原label颜色,获取手指离开屏幕时的坐标点, 在label范围内的话就可以触发自定义的操作 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {     [self setTextColor:COLOR(59,136,195,1.0)];     UITouch *touch = [touches anyObject];     CGPoint points = [touch locationInView:self];     if (points.x >= self.frame.origin.x && points.y >= self.frame.origin.x && points.x <= self.frame.size.width && points.y <= self.frame.size.height)     {         [delegate myLabel:self touchesWtihTag:self.tag];     } } - (void)dealloc {     [super dealloc]; } @end

实例化:

复制代码 MyLabel *webSite = [[MyLabel alloc] initWithFrame:CGRectMake(10, 10, 100, 20)]; [webSite setText:@"http://www.google.com"]; [webSite  setDelegate:self]; [self.view addSubview:webSite]; [webSite  release]; #pragma mark MyLabel Delegate Methods // myLabel是你的MyLabel委托的实例, tag是该实例的tag值, 有点多余, 哈哈 - (void)myLabel:(MyLabel *)myLabel touchesWtihTag:(NSInteger)tag {     [[UIApplication sharedApplication] openURL:[NSURL URLWithString:webSite.text]]; }