UIview动画中断了IOS

Question

I am moving two UIButtons with this animation:

[UIView animateWithDuration:1.0
                              delay:0.0
                            options: UIViewAnimationCurveEaseInOut
                         animations:^{

                             self.ViewA.frame = CGRectMake(self.ViewA.frame.origin.x, self.ViewA.frame.origin.y - 174, self.ViewA.frame.size.width, self.ViewA.frame.size.height);
                             self.ViewB.frame = CGRectMake(self.ViewB.frame.origin.x, self.ViewB.frame.origin.y - 174, self.ViewB.frame.size.width, self.ViewB.frame.size.height);
                         }
                         completion:^(BOOL finished){

                         }];

but as the animation runs until the user holds his finger on a UIButton, if he releases the animation is interrupted. Is there a method, or something to determine when this happens and fix the position of the buttons?

Answer 1

In your completion block, the finished parameter tells you whether your animation has completed or not. If its value is NO , then the animation has been terminated. This is how you know if you need to fix the positions, etc.