动画按钮背景图片

Question

我尝试为按钮背景图像创建动画，但不知道我是否应该这样做以获得与此gif相同的结果。我需要从上到下进行背景更改。谢谢你的帮助！

Answer 1

尝试这样做

CALayer *layer = [CALayer layer];
layer.frame = CGRectMake(0, self.view.bounds.size.height, self.view.bounds.size.width, self.view.bounds.size.height);
layer.backgroundColor = [UIColor blueColor].CGColor;
[self.view.layer addSublayer:layer];

CABasicAnimation *animation = [CABasicAnimation animation];
animation.keyPath = @"position.y";
animation.byValue = @(-self.view.bounds.size.height);
animation.duration = 1;

animation.fillMode = kCAFillModeForwards;
animation.removedOnCompletion = NO;
[layer addAnimation:animation forKey:@"Splash"];