在下面的委托函数中我试图做,但没有得到理想的结果 override func didUpdateFocusInContext(context: UIFocusUpdateContext,withAnimationCoordinator coordinator: UIFocusAnimationCoordinator) { if (context.nextFocusedView == s
override func didUpdateFocusInContext(context: UIFocusUpdateContext,withAnimationCoordinator coordinator: UIFocusAnimationCoordinator) {
if (context.nextFocusedView == self) {
coordinator.addCoordinatedAnimations({ () -> Void in
self.animationDidStop(CAAnimation(), finished: true)
}, completion: { () -> Void in
})
}
else {
// handle unfocused appearance changes
coordinator.addCoordinatedAnimations({ () -> Void in
self.animationDidStop(CAAnimation(), finished: true)
}, completion: { () -> Void in
})
}
context.nextFocusedView?.layer.shadowOffset = CGSizeZero
context.nextFocusedView?.layer.shadowOpacity = 0.9;
context.nextFocusedView?.layer.shadowRadius = 0;
context.nextFocusedView?.layer.shadowColor= UIColor.orangeColor().CGColor
context.previouslyFocusedView?.layer.shadowOpacity = 0;
}
首先,您必须将按钮类型设置为自定义类型.通过自定义类型,您将不再获得系统动画,因此您必须自己完成所有动画.
然后,您可以在UIViewController中实现didUpdateFocusInContext方法,或者如果单个屏幕上有更多按钮类型,您可以创建自己的UIButton子类.
这是我在UIButton子类中使用的代码.这将提供按钮放大以及焦点上的红色边框,并将在焦点丢失时达到正常状态.
let scale = 1.1
layer.borderColor = UIColor.redColor().CGColor
override func didUpdateFocusInContext(context: UIFocusUpdateContext, withAnimationCoordinator coordinator: UIFocusAnimationCoordinator) {
if context.nextFocusedView == self {
coordinator.addCoordinatedAnimations({ () -> Void in
self.transform = CGAffineTransformMakeScale(scale, scale)
self.layer.borderWidth = 2
}, completion: nil)
}
else {
coordinator.addCoordinatedAnimations({ () -> Void in
self.transform = CGAffineTransformIdentity
self.layer.borderWidth = 0
}, completion: nil)
}
}