IOS学习之路(二十五)UIView动画,弹出后移动然后消失

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:






原文地址:https://www.cnblogs.com/lixingle/p/3707720.html