我试图使用UIView.animateWithDuration
执行一组嵌套动画,但无论我使用的闭包返回参数如何,我似乎都会得到异常。
不能用类型的参数列表调用'animateWithDuration''(NSTimeInterval, delay: NSTimeInterval, options:UIViewAnimationOptions, animations: () -> Void, completion: (Bool) ->空白)
这是有问题的函数
func animateLikeButton(button: UIButton?)
{
button?.userInteractionEnabled = false;
let pixelsToScale = 9.0;
let pixelsToShrink = 4.0;
let buttonFrame = button?.frame
// Big
let scaleOriginX = Double(buttonFrame!.minX) - pixelsToScale / 2.0
let scaleOriginY = Double(buttonFrame!.minY) - pixelsToScale / 2.0
let scaleSizeX = Double(buttonFrame!.width) + pixelsToScale
let scaleSizeY = Double(buttonFrame!.height) + pixelsToScale
// Small
let shrinkOriginX = Double(buttonFrame!.minX) + pixelsToScale / 2.0
let shrinkOriginY = Double(buttonFrame!.minY) + pixelsToScale / 2.0
let shrinkSizeX = Double(buttonFrame!.width) - pixelsToScale
let shrinkSizeY = Double(buttonFrame!.height) - pixelsToScale
UIView.animateWithDuration(NSTimeInterval(0.4), delay:NSTimeInterval(0), options: UIViewAnimationOptions.CurveEaseInOut,
animations:
{
() -> Void in
button?.frame = CGRect(origin: CGPoint(x: scaleOriginX, y: scaleOriginY), size: CGSize(width: scaleSizeX, height: scaleSizeY))
},
completion:
{
(finished: Bool) -> Void in
UIView.animateWithDuration(NSTimeInterval(0.2), delay:NSTimeInterval(0.1), options: UIViewAnimationOptions.CurveEaseInOut,
animations:
{
() -> Void in
button?.frame = CGRect(origin: CGPoint(x: shrinkOriginX, y: shrinkOriginY), size: CGSize(width: shrinkSizeX, height: shrinkSizeY))
},
completion:
{
(finished: Bool) -> Void in
UIView.animateWithDuration(NSTimeInterval(0.2), delay:NSTimeInterval(0), options: UIViewAnimationOptions.CurveEaseInOut,
animations:
{
() -> Void in
button?.frame = buttonFrame!
},
completion:
{
(finished: Bool) -> Void in
button?.userInteractionEnabled = true
}
)
}
)
}
)
}
老实说,我必须尝试所有可能的闭包返回参数组合(带或不带可选),但没有运气。例如:
(_) -> Void in
(finished: Bool) in
(finished: Bool) -> bool in
finished in
_ in
有什么建议让我试试吗?
添加显式return
应该可以解决这个问题。下面的代码显示了一个示例:
UIView.animateWithDuration(1.0, delay: 1.0, options: nil, animations:
{
self.imgIcon?.alpha = 0.0
return
},
completion:
{
finished in
self.imgIcon?.hidden = true
return
})
问题似乎是,并不是所有的命名参数都是必需的,以及,花括号和圆括号的变化取决于嵌套。
UIView.animateWithDuration(NSTimeInterval(0.4), delay: NSTimeInterval(0.0), options: UIViewAnimationOptions.CurveEaseInOut, animations: { () -> Void in
button?.frame = CGRect(origin: CGPoint(x: scaleOriginX, y: scaleOriginY), size: CGSize(width: scaleSizeX, height: scaleSizeY))
}) { (finished) -> Void in
UIView.animateWithDuration(NSTimeInterval(0.2), delay: NSTimeInterval(0.1), options: UIViewAnimationOptions.CurveEaseInOut, animations: { () -> Void in
button?.frame = CGRect(origin: CGPoint(x: shrinkOriginX, y: shrinkOriginY), size: CGSize(width: shrinkSizeX, height: shrinkSizeY))
}, completion: { (finished) -> Void in
UIView.animateWithDuration(NSTimeInterval(0.2), delay: NSTimeInterval(0.0), options: UIViewAnimationOptions.CurveEaseInOut, animations: { () -> Void in
button?.frame = buttonFrame!
}, completion: { (finished) -> Void in
button?.userInteractionEnabled = true
})
})
}