如何使用 Apple TV 上的焦点引擎使 UIView 可聚焦
How to make a UIView focusable using the focus engine on Apple TV
是否可以使 UIView
可聚焦?或者我应该为所有可能的视图使用自定义 UIButton
吗?
我试图覆盖 canBecomeFocused
但没有任何反应。
所以问题是我没有注意到我的手机获得了焦点。总结一下,您需要实施
1) 覆盖 canBecomeFocused
2) 覆盖 "didUpdateFocusInContext:withAnimationCoordinator:" 方法以突出显示焦点单元格
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)
}
}
Swift 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)
}
}
看来情况有所改变,现在使视图可聚焦的正确方法是:
override var canBecomeFocused : Bool {
return true
}
Swift Pavel 代码的 3 版本:
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)
}
}
是否可以使 UIView
可聚焦?或者我应该为所有可能的视图使用自定义 UIButton
吗?
我试图覆盖 canBecomeFocused
但没有任何反应。
所以问题是我没有注意到我的手机获得了焦点。总结一下,您需要实施
1) 覆盖 canBecomeFocused
2) 覆盖 "didUpdateFocusInContext:withAnimationCoordinator:" 方法以突出显示焦点单元格
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)
}
}
Swift 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)
}
}
看来情况有所改变,现在使视图可聚焦的正确方法是:
override var canBecomeFocused : Bool {
return true
}
Swift Pavel 代码的 3 版本:
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)
}
}