是否可以在 iOS 5.1+ 上以动画方式显示屏幕亮度变化？我在用[UIScreen mainScreen] setBrightness:(float)]但我认为突然的改变很难看。
当我尝试使用正在进行的先前动画将动画设置为另一个值时，我遇到了接受的答案的问题。此解决方案取消正在进行的动画并动画到新值：
extension UIScreen {
func setBrightness(_ value: CGFloat, animated: Bool) {
if animated {
_brightnessQueue.cancelAllOperations()
let step: CGFloat = 0.04 * ((value > brightness) ? 1 : -1)
_brightnessQueue.add(operations: stride(from: brightness, through: value, by: step).map({ [weak self] value -> Operation in
let blockOperation = BlockOperation()
unowned let _unownedOperation = blockOperation
blockOperation.addExecutionBlock({
if !_unownedOperation.isCancelled {
Thread.sleep(forTimeInterval: 1 / 60.0)
self?.brightness = value
}
})
return blockOperation
}))
} else {
brightness = value
}
}
}
private let _brightnessQueue: OperationQueue = {
let queue = OperationQueue()
queue.maxConcurrentOperationCount = 1
return queue
}()
本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系:hwhale#tublm.com(使用前将#替换为@)
