是否可以使UIView成为焦点？或者我应该只为所有可能的视图使用自定义UIButton？
我试图覆盖canBecomeFocused但没有发生任何事情.
所以问题是我没注意到我的细胞得到了关注.要包装它,您需要实现
1)覆盖canBecomeFocused
2)覆盖“didUpdateFocusInContext：withAnimationCoordinator：”方法,以便能够将细胞突出显示为聚焦
Swift 2.3：
override func canBecomeFocused() -> Bool {
return true
}
override func didUpdateFocusInContext(context: UIFocusUpdateContext,withAnimationCoordinator coordinator: UIFocusAnimationCoordinator) {
if context.nextFocusedView == self {
coordinator.addCoordinatedAnimations({ () -> Void in
self.layer.backgroundColor = UIColor.blueColor().colorWithAlphaComponent(0.2).CGColor
},completion: nil)
} else if context.prevIoUslyFocusedView == self {
coordinator.addCoordinatedAnimations({ () -> Void in
self.layer.backgroundColor = UIColor.clearColor().CGColor
},completion: nil)
}
}
斯威夫特3：
override var canBecomeFocused: Bool {
return true
}
override func didUpdateFocus(in context: UIFocusUpdateContext,with coordinator: UIFocusAnimationCoordinator) {
if context.nextFocusedView == self {
coordinator.addCoordinatedAnimations({ () -> Void in
self.layer.backgroundColor = UIColor.blue.withAlphaComponent(0.2).cgColor
},completion: nil)
} else if context.prevIoUslyFocusedView == self {
coordinator.addCoordinatedAnimations({ () -> Void in
self.layer.backgroundColor = UIColor.clear.cgColor
},completion: nil)
}
}
