Objective c 如何制作NSWindow setFrame:。。已设置动画：是]功能设置为向下而不是向上？

当我调用我的[window setFrame:frame animated:YES]来放大窗口时，它工作得很好，但它会向上设置动画，并位于状态栏后面。如何使窗口向下设置动画？

我找不到一种简单的方法来实现这一点，因此我编写了一个动画函数，可以调整窗口大小，同时移动窗口，从而使其看起来像向下设置动画一样

- (IBAction)startAnimations:(id)sender{

    NSViewAnimation *theAnim;
    NSRect firstViewFrame;
    NSRect newViewFrame;
    NSMutableDictionary* firstViewDict;

    {
        firstViewDict = [NSMutableDictionary dictionaryWithCapacity:3];
        firstViewFrame = [window frame];
        [firstViewDict setObject:window forKey:NSViewAnimationTargetKey];

        [firstViewDict setObject:[NSValue valueWithRect:firstViewFrame]
                          forKey:NSViewAnimationStartFrameKey];

        newViewFrame = firstViewFrame;

        newViewFrame.size.height += 100;
        newViewFrame.origin.y -= 100;

        [firstViewDict setObject:[NSValue valueWithRect:newViewFrame]
                          forKey:NSViewAnimationEndFrameKey];
    }

    theAnim = [[NSViewAnimation alloc] initWithViewAnimations:[NSArray
                                                               arrayWithObjects:firstViewDict, nil]];

    [theAnim setDuration:1.0]; 
    [theAnim startAnimation];

    [theAnim release];
}

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只需将y坐标减小到与增加高度相同的距离即可

CGFloat amountToIncreaseWidth = 100, amountToIncreaseHeight = 100;
NSRect oldFrame = [window frame];
oldFrame.size.width += amountToIncreaseWidth;
oldFrame.size.height += amountToIncreaseHeight;
oldFrame.origin.y -= amountToIncreaseHeight;
[window setFrame:oldFrame animated:YES];

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这就是我最终要做的，理想情况下，我想用内置的动画功能做一些事情，但我没有看到一种方法可以做到这一点。这使用内置的动画。