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我正在应用CAAnimation在屏幕上和屏幕上移动工具栏。CAAnimation持续时间不适用
当我触摸上海华，触发该下面的方法：
- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
[UIView beginAnimations:kViewerToggleToolbarAnimation context:nil];
if (self.viewerToolbarView.isVisible) {
self.viewerToolbarView.frame = CGRectMake(0, self.frame.size.height, self.viewerToolbarView.frame.size.width, self.viewerToolbarView.frame.size.height);
self.viewerToolbarView.isVisible = NO;
}
else {
self.viewerToolbarView.frame = CGRectMake(0, self.frame.size.height - kUIToolbarHeight, self.viewerToolbarView.frame.size.width, self.viewerToolbarView.frame.size.height);
self.viewerToolbarView.isVisible = YES;
}
[UIView commitAnimations];
}
这反过来触发子视图的委托方法：
- (id<CAAction>) actionForLayer:(CALayer *)layer forKey:(NSString *)key {
id<CAAction> animation = nil;
if ([key isEqualToString:kViewerToggleToolbarAnimation]) {
animation = [CABasicAnimation animation];
if (self.isVisible)
((CABasicAnimation*)animation).duration = kViewerToolbarHideAnimationDuration;
else
((CABasicAnimation*)animation).duration = kViewerToolbarShowAnimationDuration;
((CABasicAnimation*)animation).timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionDefault];
}
else {
animation = [super actionForLayer:layer forKey:key];
}
return animation;
}
kViewerToggleToolbarAnimation，kViewerToolbarHideAnimationDuration和kViewerToolbarShowAnimationDuration在别处定义为常数：
extern NSString * const kViewerToggleToolbarAnimation;
extern CGFloat const kViewerToolbarShowAnimationDuration;
extern CGFloat const kViewerToolbarHideAnimationDuration;
...
NSString * const kViewerToggleToolbarAnimation = @"kViewerToggleToolbarAnimation";
CGFloat const kViewerToolbarShowAnimationDuration = 2.50f;
CGFloat const kViewerToolbarHideAnimationDuration = 2.75f;
问题是我可以在常量文件中增加这些持续时间值，但委托方法会忽略这些持续时间并应用其自身的显着短持续时间（粗略为0.5秒）。
2.5和2.75秒是非常明显的长时间，否则动画会运行，如果它正常工作。
我在做什么错误的动作，导致这些持续时间常量被忽略？否则它会编译并运行良好，所以它不会抱怨无法找到常量。