继苹果公司的建议，我通过把后续调用链的UIView动画-animationWithDuration:animation:在completion:块的其他的调用的aanimateWithDuration:animation:completion: ，就像这样：
[UIView animateWithDuration:scaleDuration delay:0 options:UIViewAnimationOptionCurveEaseIn animations:^{
// Scale the controllers' views down.
self.view.transform = CGAffineTransformScale(self.view.transform, 0.8, 0.8);
} completion:^(BOOL finished) {
// Transition to the new view and push on the new view controller.
[UIView transitionWithView:self.view duration:1 options:UIViewAnimationOptionCurveLinear | UIViewAnimationOptionTransitionFlipFromLeft animations:^{
[self pushViewController:viewController animated:NO];
} completion:^(BOOL finished) {
[UIView animateWithDuration:scaleDuration delay:0 options:UIViewAnimationOptionCurveLinear animations:
^{
// Scale back to the original size.
self.view.transform = CGAffineTransformScale(self.view.transform, 1.25, 1.25);
} completion:nil];
}];
}];
该动画的所有执行正确的顺序，但它们之间有一个微小的延迟，尤其是前-transitionWithView:duration:options:animations:completion:调用。 如何理顺动画步骤之间的转换？
在旁边：
有为什么要以这种方式滥用导航控制器什么特别的原因？ 你不能只是使用presentViewController:animated:completion:过渡样式设置为UIModalTransitionStyleFlipHorizontal ？
回到你的问题：
我非常肯定的口吃源于一个简单的事实pushViewController:animated:隐含有加载视图控制器是要推的观点，而这需要一些时间。
所以，如果你不能使用presentViewController:animated:completion: （或presentModalViewController：动画：如果您有支持的iOS 4）的方式，我会鼓励你去尝试这样的：
// ensure the view is already loaded when you invoke `pushViewController:animated:`
[viewController view];
// there is no strict need to calculate those in situ, so we do it up front
CGAffineTransform originalTransform = self.view.transform;
CGAffineTransform downscalingTransform = CGAffineTransformScale(originalTransform, 0.8, 0.8);
// I found it hard to read the block-in-a-block-in-a... while editing here, so I've taken them apart:
void (^scaleDownAnimation)() = ^{
self.view.transform = downscalingTransform;
};
void (^restoreScaleAnimation)() = ^{
self.view.transform = originalTransform;
};
void (^pushControllerAnimation)() = ^{
[self pushViewController:viewController animated:NO];
};
void (^pushAnimationCompletion)(BOOL) = ^(BOOL unused) {
[UIView animateWithDuration:scaleDuration
delay:0
options:UIViewAnimationOptionCurveLinear
animations:restoreScaleAnimation
completion:nil];
};
void (^downscaleCompletion)(BOOL) = ^(BOOL unused){
UIViewAnimationOptions linearFlipFromLeft = UIViewAnimationOptionCurveLinear | UIViewAnimationOptionTransitionFlipFromLeft;
[UIView transitionWithView:self.view
duration:1
options:linearFlipFromLeft
animations:pushControllerAnimation
completion:pushAnimationCompletion];
};
[UIView animateWithDuration:scaleDuration
delay:0
options:UIViewAnimationOptionCurveEaseIn
animations:scaleDown
completion:downscaleCompletion];
需要注意的是牛肉是前六行中，所有剩下的只是为了保持完整性。
因为你没有延迟形容我链式动画。
您正在使用transitionWithView：持续时间：选择：动画：完成：与动画块是给pushViewController呼叫：动画:. 这没有任何意义，我。
transitionWithView：持续时间：选择：动画：完成转变从一个子视图下。
pushViewController：动画是推动导航控制器堆栈上的视图控制器导航控制器方法。 使用这些2在一起是没有意义的我。
如果你希望你的规模的动画与推结束，那么就直接从你的完成块调用推送动画。
在我的经验中，“使用完毕块链动画”简直是有缺陷的（让子动画之间的小停顿）。 我确信没有的loadView / viewDidLoad中/ viewWillAppear中/ viewWillLayoutSubviews滥用回事。
完全相同的代码口吃与“竣工block_chainig”但如果我返工它使用关键帧作品就好。
所以，相反的（例如）...
UIView.animate(withDuration: 1, animations: {[weak self] in
...
self?.view.layoutIfNeeded()
}, completion: { [weak self] _ in
UIView.animate(withDuration: 1, animations: {
...
self?.view.layoutIfNeeded()
}, completion: { [weak self] _ in
UIView.animate(withDuration: 1, animations: {
...
self?.view.layoutIfNeeded()
}, completion: { [weak self] _ in
...
})
})
})
...我不是喜欢...
UIView.animateKeyframes(withDuration: 3, delay: 0, options: .calculationModeLinear, animations: {[weak self] in
UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 0.33, animations: {[weak self] in
...
self?.view.layoutIfNeeded()
})
UIView.addKeyframe(withRelativeStartTime: 0.33, relativeDuration: 0.33, animations: {[weak self] in
...
self?.view.layoutIfNeeded()
})
UIView.addKeyframe(withRelativeStartTime: 0.66, relativeDuration: 0.33, animations: {[weak self] in
...
self?.view.layoutIfNeeded()
})
}, completion: { [weak self] _ in
...
})
