iOS：为什么对象在动画合成之后转到开始位置

Question

））我想动画UIButton（两个并行动画：改变图像和移动），如下所示，动画按钮应该移动后，但在完成动画按钮后转向开始位置。请帮助解决它！提前致谢！

- (IBAction)bugOneTapped:(id)sender 
{ 
    [UIView animateWithDuration:1.0 
       animations:^{ 
        self.bugOneButton.imageView.animationImages = 
        [NSArray arrayWithObjects:[UIImage imageNamed:@"bugOne3"],[UIImage imageNamed:@"bugOne2"],[UIImage imageNamed:@"bugOne1"],[UIImage imageNamed:@"bugOne2"],[UIImage imageNamed:@"bugOne3"],[UIImage imageNamed:@"bugOne4"],[UIImage imageNamed:@"bugOne5"],[UIImage imageNamed:@"bugOne4"],nil]; 
        self.bugOneButton.imageView.animationDuration = 0.3; 
        [self.bugOneButton.imageView startAnimating]; 


        self.bugOneButton.center = CGPointMake(self.bugOnePositionX, self.bugOneButton.center.y - 50); 
        self.bugOnePositionY = self.bugOnePositionY - 50; 


       }completion:^(BOOL finished) { 
        [self.bugOneButton.imageView stopAnimating]; 
       }]; 

self.bugOneButton.center = CGPointMake(self.bugOnePositionX, self.bugOnePositionY); 
} 

Answer 1

在你的代码删除以下行

self.bugOneButton.center = CGPointMake(self.bugOnePositionX, self.bugOnePositionY); 

它将修正..

Answer 2

@Genie诚征说的很对，删除代码

self.bugOneButton.center = CGPointMake(self.bugOnePositionX, self.bugOnePositionY) 

这将重置按钮位置！

Answer 3

re移动此两个线路

- (IBAction)bugOneTapped:(id)sender 
{ 
    [UIView animateWithDuration:1.0 
       animations:^{ 
        self.bugOneButton.imageView.animationImages = 
        [NSArray arrayWithObjects:[UIImage imageNamed:@"bugOne3"],[UIImage imageNamed:@"bugOne2"],[UIImage imageNamed:@"bugOne1"],[UIImage imageNamed:@"bugOne2"],[UIImage imageNamed:@"bugOne3"],[UIImage imageNamed:@"bugOne4"],[UIImage imageNamed:@"bugOne5"],[UIImage imageNamed:@"bugOne4"],nil]; 
        self.bugOneButton.imageView.animationDuration = 0.3; 
        [self.bugOneButton.imageView startAnimating]; 

        self.bugOneButton.center = CGPointMake(self.bugOnePositionX, self.bugOneButton.center.y - 50); 

       }completion:^(BOOL finished) { 
        [self.bugOneButton.imageView stopAnimating]; 
       }]; 


}