我正在尝试为 CAGradientLayer 上的变换设置动画,但是无论我做什么,我似乎都无法进行更改。此代码运行后,图层仍然不可见(即 scale.y 仍为 0.0f)。
@implementation NickView
+(Class) layerClass {
return [CAGradientLayer class];
}
- (void) didMoveToWindow {
self.backgroundColor = [UIColor clearColor];
CAGradientLayer* gLayer = (CAGradientLayer*)self.layer;
[gLayer setColors:
[NSArray arrayWithObjects:
(id) [UIColor blackColor].CGColor,
(id) [UIColor redColor].CGColor,
(id) [UIColor blackColor].CGColor,
nil]];
gLayer.transform = CATransform3DMakeScale(1.0, 0.0f, 1.0f);
[self performSelector:@selector(doAnimation) withObject:nil afterDelay:3.0f];
}
- (void) doAnimation {
CABasicAnimation* a = [CABasicAnimation animationWithKeyPath:@"transform.scale.y"];
a.delegate = self;
a.duration = 5.0f;
a.toValue = [NSNumber numberWithFloat:1.0f];
[self.layer addAnimation:a forKey:@"anim"];
}
}
有谁知道为什么这不会导致图层的 scale.y 被动画回 1?