本来有了双击代码的识别：
let doubleTap = UITapGestureRecognizer(target: self, action: "doubleTapped:") doubleTap.numberOfTapsRequired = 2 doubleTap.numberOfTouchesRequired = 1 self.scrollView.addGestureRecognizer(doubleTap) func doubleTapped(recognizer: UITapGestureRecognizer) { if (self.scrollView.zoomScale == self.scrollView.maximumZoomScale) { self.scrollView.setZoomScale(self.scrollView.minimumZoomScale, animated: true) } else { let pointInView = recognizer.locationInView(self.imageView) // print("pointInView=\(pointInView)") //(898.155653734425, 425.882443769075) var newZoomScale = scrollView.zoomScale * 1.5 // print("newZoomScale=\(newZoomScale)") //0.986187634979701 newZoomScale = min(newZoomScale, scrollView.maximumZoomScale) // print("newZoomScale=\(newZoomScale)") //0.986187634979701 let scrollViewSize = scrollView.bounds.size // print("scrollViewSize=\(scrollViewSize)") //(375.0, 603.0) let w = scrollViewSize.width / newZoomScale let h = scrollViewSize.height / newZoomScale let x = pointInView.x – (w / 2.0) let y = pointInView.y – (h / 2.0) let rectToZoomTo = CGRectMake(x, y, w, h); // print("rectToZoomTo=\(rectToZoomTo)") //(708.029562766088, 120.159689491989, 380.252181936674, 611.445508554172) scrollView.zoomToRect(rectToZoomTo, animated: true) } } |
可以正常工作
但是加了单击后：
let singleTap = UITapGestureRecognizer(target: self, action: "singleTap:") singleTap.numberOfTapsRequired = 1 singleTap.numberOfTouchesRequired = 1 self.scrollView.addGestureRecognizer(singleTap) func singleTap(recognizer:UITapGestureRecognizer){ if recognizer.state == UIGestureRecognizerState.Ended { self.navigationController?.popViewControllerAnimated(true) } } |
结果：
双击时，第一次的点击，就触发了单击，导致双击失效。
搜：
swift single double tap
swift single double tap conflict
iphone – How to recognize oneTap/doubleTap at moment? – Stack Overflow
结果试了半天，也没搞定：
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?){ if (touches.count == 2) { //This will cancel the singleTap action NSObject.cancelPreviousPerformRequestsWithTarget(self) } } override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) { if (touches.count == 1) { singleTap() } else if (touches.count == 2) { if let firsTouch = touches.first { doubleTapped(firsTouch) } } } |
参考：
去搜：
requireGestureRecognizerToFail
参考：
IOS开发之手势——UIGestureRecognizer 共存 – 松花江以南 – 博客园
只需要加一行：
singleTap.requireGestureRecognizerToFail(doubleTap) |
成为：
let doubleTap = UITapGestureRecognizer(target: self, action: "doubleTapped:") doubleTap.numberOfTapsRequired = 2 doubleTap.numberOfTouchesRequired = 1 self.scrollView.addGestureRecognizer(doubleTap) let singleTap = UITapGestureRecognizer(target: self, action: "singleTap:") singleTap.numberOfTapsRequired = 1 singleTap.numberOfTouchesRequired = 1 self.scrollView.addGestureRecognizer(singleTap) singleTap.requireGestureRecognizerToFail(doubleTap) func doubleTapped(recognizer: UITapGestureRecognizer) { if (self.scrollView.zoomScale == self.scrollView.maximumZoomScale) { self.scrollView.setZoomScale(self.scrollView.minimumZoomScale, animated: true) } else { let pointInView = recognizer.locationInView(self.imageView) // print("pointInView=\(pointInView)") //(898.155653734425, 425.882443769075) var newZoomScale = scrollView.zoomScale * 1.5 // print("newZoomScale=\(newZoomScale)") //0.986187634979701 newZoomScale = min(newZoomScale, scrollView.maximumZoomScale) // print("newZoomScale=\(newZoomScale)") //0.986187634979701 let scrollViewSize = scrollView.bounds.size // print("scrollViewSize=\(scrollViewSize)") //(375.0, 603.0) let w = scrollViewSize.width / newZoomScale let h = scrollViewSize.height / newZoomScale let x = pointInView.x – (w / 2.0) let y = pointInView.y – (h / 2.0) let rectToZoomTo = CGRectMake(x, y, w, h); // print("rectToZoomTo=\(rectToZoomTo)") //(708.029562766088, 120.159689491989, 380.252181936674, 611.445508554172) scrollView.zoomToRect(rectToZoomTo, animated: true) } } func singleTap(recognizer:UITapGestureRecognizer){ if recognizer.state == UIGestureRecognizerState.Ended { //self.navigationController?.popViewControllerAnimated(true) self.navigationController?.popViewControllerAnimated(false) } } |
即可。
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