NSTextField的抖动动画

Question

基于对UIView和UITextField抖动动画提出的类似问题，我实现了这段代码，它应该适用于NSTextFields。但是，动画永远不会运行。这里有什么问题？

NSRect textFieldFrame = [textfield frame];
CGFloat centerX = textFieldFrame.origin.x;
CGFloat centerY = textFieldFrame.origin.y;
CABasicAnimation *animation = [[CABasicAnimation alloc] init];
animation.keyPath = @"position";
animation.duration = 0.07;
animation.repeatCount = 4;
animation.autoreverses = true;
NSPoint one = NSMakePoint(centerX-5, centerY);
NSPoint two = NSMakePoint(centerX+5, centerY);
animation.fromValue = [NSValue valueWithPoint:one];
animation.toValue = [NSValue valueWithPoint:two];
[textfield.layer addAnimation:animation forKey:@"position"];

注意：[[textfield animator] setFrameOrigin:one];成功移动文本字段

Answer 1

我最终使用了重复的NSAnimationContext动画组，每个动画组在完成时调用另一个。如果有更好的方法，我仍在寻找。但如果其他人需要，这里是我的解决方案

NSRect textFieldFrame = [textfield frame];
CGFloat centerX = textFieldFrame.origin.x;
CGFloat centerY = textFieldFrame.origin.y;
NSPoint origin = NSMakePoint(centerX, centerY);
NSPoint one = NSMakePoint(centerX-5, centerY);
NSPoint two = NSMakePoint(centerX+5, centerY);

[NSAnimationContext beginGrouping];
[[NSAnimationContext currentContext] setCompletionHandler:^{
    [NSAnimationContext beginGrouping];
    [[NSAnimationContext currentContext] setCompletionHandler:^{

        [NSAnimationContext beginGrouping];
        [[NSAnimationContext currentContext] setCompletionHandler:^{
            [NSAnimationContext beginGrouping];
            [[NSAnimationContext currentContext] setCompletionHandler:^{
                [[NSAnimationContext currentContext] setDuration:0.0175];
                [[NSAnimationContext currentContext] setTimingFunction: [CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionEaseOut]];
                [[textfield animator] setFrameOrigin:origin];
            }];
            [[NSAnimationContext currentContext] setDuration:0.0175];
            [[NSAnimationContext currentContext] setTimingFunction: [CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionEaseOut]];
            [[textfield animator] setFrameOrigin:two];
            [NSAnimationContext endGrouping];
        }];
        [[NSAnimationContext currentContext] setDuration:0.0175];
        [[NSAnimationContext currentContext] setTimingFunction: [CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionEaseOut]];
        [[textfield animator] setFrameOrigin:one];
        [NSAnimationContext endGrouping];
    }];
    [[NSAnimationContext currentContext] setDuration:0.0175];
    [[NSAnimationContext currentContext] setTimingFunction: [CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionEaseOut]];
    [[textfield animator] setFrameOrigin:two];
    [NSAnimationContext endGrouping];
}];
[[NSAnimationContext currentContext] setDuration:0.0175];
[[NSAnimationContext currentContext] setTimingFunction: [CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionEaseOut]];
[[textfield animator] setFrameOrigin:one];
[NSAnimationContext endGrouping];