cocoa - 未调用核心动画委托(delegate)

Question

我显然做错了什么。当我设置 View 框架时，我的委托(delegate)不会被调用。

框架版本不工作

-(void)someMethod {
    CAAnimation *anim = [CABasicAnimation animation];
    [anim setDelegate:self];
    [[currentViewController view] setAnimations:[NSDictionary dictionaryWithObject:anim forKey:@"frame"]];
    [[newViewController view] setAnimations:[NSDictionary dictionaryWithObject:anim forKey:@"frame"]];

    [[[currentViewController view] animator] setFrame:currentTarget];
    [[[newViewController view] animator] setFrame:newTarget];
}

- (void)animationDidStop:(CAAnimation *)animation finished:(BOOL)flag {
    NSLog(@"Yep; works!");
}

很奇怪；使用 alphaValue 的相同代码确实有效:

-(void)someMethod {
    CAAnimation *anim = [CABasicAnimation animation];
    [anim setDelegate:self];
    [[currentViewController view] setAnimations:[NSDictionary dictionaryWithObject:anim forKey:@"alphaValue"]];
    [[newViewController view] setAnimations:[NSDictionary dictionaryWithObject:anim forKey:@"alphaValue"]];

    [[[currentViewController view] animator] setAlphaValue:0.5];
    [[[newViewController view] animator] setAlphaValue:0.5];
}

- (void)animationDidStop:(CAAnimation *)animation finished:(BOOL)flag {
    NSLog(@"Yep; works!");
}

你能告诉我我在这里缺少什么吗？我只是不明白。感谢您抽出时间。

Answer 1

可以使用动画器来触发委托(delegate)方法来设置框架。为此，您需要分别为 frameSize 和 frameOrigin 键添加动画:

-(void)someMethod {
    CAAnimation *anim = [CABasicAnimation animation];
    [anim setDelegate:self];

    [[currentViewController view] setAnimations:[NSDictionary dictionaryWithObject:anim forKey:@"frameOrigin"]];
    [[currentViewController view] setAnimations:[NSDictionary dictionaryWithObject:anim forKey:@"frameSize"]];
    [[newViewController view] setAnimations:[NSDictionary dictionaryWithObject:anim forKey:@"frameOrigin"]];
    [[newViewController view] setAnimations:[NSDictionary dictionaryWithObject:anim forKey:@"frameSize"]];

    [NSAnimationContext beginGrouping];
    [[[currentViewController view] animator] setFrame:currentTarget];
    [[[newViewController view] animator] setFrame:newTarget];
    [NSAnimationContext endGrouping];
}

- (void)animationDidStop:(CAAnimation *)animation finished:(BOOL)flag {
    NSLog(@"Yep; works!");
}

在此示例中，您的委托(delegate)方法将为四个动画中的每一个动画触发。如果您要重新定位 View 而不调整大小，则不需要 frameSize 动画。