UIView动画曲线不能正常工作

Question

我被一个非常简单的任务困扰,我希望UIView动画能够轻松进入/缓出但是尽管使用了正确的animationOption,它仍然是线性的.

这是所有帐户应该工作的代码,它是在UIViewControllerAnimatedTransitioning类中设置的,但我在之前的自定义segue类中有相同的问题;

[UIView animateWithDuration:0.4f delay:0.0f options:UIViewAnimationOptionCurveEaseInOut animations:^(void) {

        self.dimView.alpha = 1.0;
        self.imageView.frame = self.destinationRect;

    } completion:^(BOOL finished) {

        [self.imageView removeFromSuperview];
        [self.dimView removeFromSuperview];

        [transitionContext completeTransition:YES];

     }];

但是,使用以下代码的弹簧动画虽然我不愿意这样做.

[UIView animateWithDuration:0.8f delay:0 usingSpringWithDamping:0.7f initialSpringVelocity:2.0f options:UIViewAnimationOptionCurveEaseInOut animations:^(void) {

        self.dimView.alpha = 1.0;
        self.imageView.frame = self.destinationRect;

     } completion:^(BOOL finished){

        [self.imageView removeFromSuperview];
        [self.dimView removeFromSuperview];

        [transitionContext completeTransition:YES];

     }];

我在模拟器和iPad2测试设备上得到了相同的行为.难道我做错了什么？动画帧或alpha值是否存在问题？

Answer 1

你可以试试这个。-

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:0.4f];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:@selector(animationDidStop)];

self.dimView.alpha = 1.0;
self.imageView.frame = self.destinationRect;

[UIView commitAnimations];

- (void) animationDidStop {
    [self.imageView removeFromSuperview];
    [self.dimView removeFromSuperview];
    [transitionContext completeTransition:YES];
}

希望能帮助到你。