Question

我目前在该部分中有一个透明部分的自定义视图。我目前正在使用：

创建它

override func drawRect(rect: CGRect) {
    bgColor.setFill()
    UIRectFill(rect)
    let holeRect = imageView.frame
    let intersect = CGRectIntersection(holeRect, rect)
    UIColor.clearColor().setFill()
    UIRectFill(intersect)
}

我还想为透明的内部视图设置动画，首先它会变小，然后将透明部分设置为更大的动画......我将如何实现这一目标？

我目前将此作为我的动画

func startAnimating(completion: () -> Void) {

    let shrinkDuration = animationDuration * 0.5
    let growDuration = animationDuration * 0.9
    self.setNeedsDisplay()
    UIView.animateWithDuration(shrinkDuration, delay: 0, usingSpringWithDamping: 0.7, initialSpringVelocity: 10, options: .CurveEaseInOut, animations: { () -> Void in
        //Do Animation
        let scaleTransform = CGAffineTransformMakeScale(0.75, 0.75)
        self.imageView.transform = scaleTransform
    }) { (finished) -> Void in
        self.setNeedsDisplay()

        UIView.animateWithDuration(growDuration, animations: { () -> Void in
            let scaleTransform = CGAffineTransformMakeScale(20, 20)
            self.imageView.transform = scaleTransform
            self.alpha = 0
        }, completion: { (finished) -> Void in
            self.removeFromSuperview()
            completion()
        })

    }
}

虽然

没有调整holeRect部分的大小

Answer 1

尝试添加以下动画块

UIView.animateWithDuration(0.2, animations: {
    //animate your alpha property here
}, completion: { finished in
    //do whatever you need to do when the animation finish 
})

动画UIRectFill /透明视图

1 个答案: