首先在viewdidload中添加UIlable并且把其设为隐藏
然后在点击按钮后,让其弹出移动后消失
//点击按钮后:
#pragma mark 点击关注按钮
- (IBAction)guanzhuBtnClick:(id)sender { self.myAlertLabel=[[UILabel alloc] initWithFrame:CGRectMake(275, 85, 15, 15)]; //起始高度设的大点
self.myAlertLabel.text=@"+";
self.myAlertLabel.backgroundColor=[UIColor clearColor]; //背景色设为透明
self.myAlertLabel.hidden=YES;
[self.view addSubview:self.myAlertLabel];
if (self.myAlertLabel.hidden==YES) {
self.myAlertLabel.textColor=[UIColor grayColor];
self.myAlertLabel.hidden=NO;
[UIView animateWithDuration:0.5 //动画时间
delay:0.0 //开始延迟时间
options: UIViewAnimationCurveEaseInOut //弹入弹出
animations:^{
self.myAlertLabel.frame = CGRectMake(275, 75, 15, 15); //终止高度设的小于起始高度 }
completion:^(BOOL finished){
if (finished)
[self.myAlertLabel removeFromSuperview]; //移动后隐藏
}]; }
// self.myAlertLabel.hidden=YES; }
效果图: