出于某种原因,如果在添加 subview 后直接将动画添加到 subview 的图层,则 CATransition 将不会设置动画:
transitionView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
[transitionView setBackgroundColor:[UIColor redColor]];
[[self contentView] addSubview:transitionView];
CATransition *animation = [CATransition animation];
[animation setDelegate:self];
[animation setType:@"cube"];
[animation setDuration:1.0];
[animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn]];
[animation setSubtype:@"fromRight"];
[[transitionView layer] addAnimation:animation forKey:nil];
但是如果动画是在稍微延迟后添加的:
transitionView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
[transitionView setBackgroundColor:[UIColor redColor]];
[[self contentView] addSubview:transitionView];
CATransition *animation = [CATransition animation];
[animation setDelegate:self];
[animation setType:@"cube"];
[animation setDuration:1.0];
[animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn]];
[animation setSubtype:@"fromRight"];
[self performSelector:@selector(animate) withObject:nil afterDelay:0.00001];
-
- (void)animate
{
CATransition *animation = [CATransition animation];
[animation setDelegate:self];
[animation setType:@"cube"];
[animation setDuration:1.0];
[animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn]];
[animation setSubtype:@"fromRight"];
[[transitionView layer] addAnimation:animation forKey:nil];
}
过渡将按预期进行。这有什么原因吗?
最佳答案
我也见过这种行为。我认为这是因为该层位于您可以访问的“模型”层层次结构中,但尚未将其添加到代表屏幕上实际内容的“真实”数据结构中。
无论如何,您可以通过使用 [CATransactionlush]
来解决这个问题,如下所示:
transitionView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
[transitionView setBackgroundColor:[UIColor redColor]];
[[self contentView] addSubview:transitionView];
// Synchronize the implementation details with my changes so far.
[CATransaction flush];
CATransition *animation = [CATransition animation];
[animation setDelegate:self];
[animation setType:@"cube"];
[animation setDuration:1.0];
[animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn]];
[animation setSubtype:@"fromRight"];
[[transitionView layer] addAnimation:animation forKey:nil];
关于iphone - 如果在添加 subview 后直接将 CATransition 添加到 subview 的图层,为什么 CATransition 不起作用?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9552400/