等待动画在iOS完成？

Question

我想在动画结束后执行doSomethingElse.另一个限制是动画代码可以具有不同的持续时间.我怎样才能做到这一点？谢谢!

-(void) doAnimationThenSomethingElse {
  [self doAnimation];
  [self doSomethingElse];
}

例如,这不起作用:

animationDuration = 1;
[UIView animateWithDuration:animationDuration
    animations:^{
      [self doAnimation];
    } completion:^(BOOL finished) {
      [self doSomethingElse];
    }
];

Answer 1

如果您不是动画的作者,则可以在动画结束时使用事务完成块获取回调:

[CATransaction setCompletionBlock:^{
     // doSomethingElse
}];
// doSomething

Answer 2

使用块动画:

[UIView animateWithDuration:animationDuration
    animations:^{
        // Put animation code here
    } completion:^(BOOL finished) {
        // Put here the code that you want to execute when the animation finishes
    }
];