label添加手势（触摸改变其背景颜色） àì夳堔傛蜴生んèń 2022-01-07 15:19 260阅读 0赞 \- (BOOL)application:(UIApplication \*)application didFinishLaunchingWithOptions:(NSDictionary \*)launchOptions \{ self.window = \[\[UIWindowalloc\] initWithFrame:\[\[UIScreenmainScreen\] bounds\]\]; UILabel \*lab1=\[\[UILabelalloc\]initWithFrame:CGRectMake(20, 30, 100, 30)\]; lab1.text=@"helloworld"; //设置tag属性 lab1.tag=1; UITapGestureRecognizer \*tap=\[\[UITapGestureRecognizeralloc\]initWithTarget:selfaction:@selector(randomColor:)\]; \[lab1 addGestureRecognizer:tap\]; lab1.userInteractionEnabled=YES; \[self.window addSubview:lab1\]; self.window.backgroundColor = \[UIColorwhiteColor\]; \[self.windowmakeKeyAndVisible\]; returnYES; \} \-(void)randomColor:(UITapGestureRecognizer \*)gestureRecognizer \{ //通过tag属性来获取label UILabel \*lab=(UILabel \*)\[self.window viewWithTag:1\]; lab.backgroundColor=\[UIColorcolorWithRed:arc4random()%256/255.0green:arc4random()%256/255.0blue:arc4random()%256/255.0alpha:1\]; \} 转载于:https://www.cnblogs.com/thbbsky/p/3750111.html
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