Tag: 滞后

为iOS性能问题绘制应用程序: 我正在为iOS创build绘图应用程序。通过触摸来绘制东西我使用了本教程中的代码： http : //www.raywenderlich.com/18840/how-to-make-a-simple-drawing-app-with-uikit 我用于绘制的代码如下所示： – (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { mouseSwiped = NO; UITouch *touch = [touches anyObject]; lastPoint = [touch locationInView:self.view]; } – (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { mouseSwiped = YES; UITouch *touch = [touches anyObject]; CGPoint currentPoint = [touch locationInView:self.view]; UIGraphicsBeginImageContext(self.view.frame.size); [self.tempDrawImage.image drawInRect:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)]; CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y); CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, […]

iOS AssistiveTouch使用自定义键盘时animation较慢: 我正在构build一个自定义的键盘，现在一切都很好，除非在启用自定义键盘的过程中使用AssistiveTouch时，点击打开它时，AssistiveTouch的animation有点迟缓（慢放大，缩小）。我在iPhone 4s和iPhone 6上testing过，同样的麻烦，所以我认为不是关于设备硬件或资源消耗。任何人有同样的麻烦或知道的原因？以及如何解决它？

尽pipeprepareToPlay（）在Swift中AVAudioPlayer产生滞后: 播放一个非常短的声音（〜0.5s）会在Swift中编写的SpriteKit iOS游戏中产生一个呃逆（就像一个延迟）。在其他问题中，我读了我应该prepareToPlay()声音，我做了。我甚至用一个variables（ soundReady ）来检查在播放之前是否准备好声音。每当播放完成时，我也会重新准备声音（ audioPlayerDidFinishPlaying() ）。以下是代码的相关部分： class GameScene: SKScene, AVAudioPlayerDelegate { var splashSound = NSURL() var audioPlayer = AVAudioPlayer() var soundReady = false override func didMoveToView(view: SKView) { let path = NSBundle.mainBundle().pathForResource("plopSound", ofType: "m4a") splashSound = NSURL(fileURLWithPath: path) audioPlayer = AVAudioPlayer(contentsOfURL: splashSound, error: nil) audioPlayer.delegate = self soundReady = audioPlayer.prepareToPlay() } […]