如何通过双击来加速识别单个抽头?
我有排一个UITableView,我添加单击手势与双击手势:如何通过双击来加速识别单个抽头?
let doubleTap = UITapGestureRecognizer(target: self, action: "doubleTap:")
doubleTap.numberOfTapsRequired = 2
doubleTap.numberOfTouchesRequired = 1
tableView.addGestureRecognizer(doubleTap)
let singleTap = UITapGestureRecognizer(target: self, action: "singleTap:")
singleTap.numberOfTapsRequired = 1
singleTap.numberOfTouchesRequired = 1
singleTap.requireGestureRecognizerToFail(doubleTap)
tableView.addGestureRecognizer(singleTap)
有没有减少在第一轻叩由当手势识别之间的时间的方式实现,这是一次点击而不是双击。
我在问这个,因为当我点击一下时,新的viewController显得很晚,给人的感觉是应用程序滞后。
我找到了答案,这个link
雨燕版本:
class UIShortTapGestureRecognizer: UITapGestureRecognizer {
let tapMaxDelay: Double = 0.3
override func touchesBegan(touches: NSSet!, withEvent event: UIEvent!) {
super.touchesBegan(touches, withEvent: event)
delay(tapMaxDelay) {
// Enough time has passed and the gesture was not recognized -> It has failed.
if self.state != UIGestureRecognizerState.Ended {
self.state = UIGestureRecognizerState.Failed
}
}
}
}
随着delay(delay: Double, closure:()->())
:
class func delay(delay:Double, closure:()->()) {
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, Int64(delay * Double(NSEC_PER_SEC))), dispatch_get_main_queue(), closure)
}
不要忘记在定义'UITapGestureRecognizer'子类的文件中添加'import UIKit.UIGestureRecognizerSubclass'。 (来自http://*.com/a/26557518/341954) 否则你会得到构建错误:_“方法不覆盖任何方法从它的超类”_。 – PDK 2016-11-21 16:24:27
为今后全面实施霍华德阳,这里的链接: https://github.com/oney/SingleDoubleTapGestureRecognizer
let tap = SingleDoubleTapGestureRecognizer(target: self, singleAction: Selector("singleTap"), doubleAction: Selector("doubleTap"))
tap.duration = 0.8
view.addGestureRecognizer(tap)
//
// SingleDoubleTapGestureRecognizer.swift
// SingleDoubleTapGestureRecognizer
//
// Created by Howard Yang on 08/22/2015.
// Copyright (c) 2015 Howard Yang. All rights reserved.
//
import UIKit
public class SingleDoubleTapGestureRecognizer: UITapGestureRecognizer {
var targetDelegate: SingleDoubleTapGestureRecognizerDelegate
public var duration: CFTimeInterval = 0.3 {
didSet {
self.targetDelegate.duration = duration
}
}
public init(target: AnyObject, singleAction: Selector, doubleAction: Selector) {
targetDelegate = SingleDoubleTapGestureRecognizerDelegate(target: target, singleAction: singleAction, doubleAction: doubleAction)
super.init(target: targetDelegate, action: Selector("fakeAction:"))
numberOfTapsRequired = 1
}
}
class SingleDoubleTapGestureRecognizerDelegate: NSObject {
var target: AnyObject
var singleAction: Selector
var doubleAction: Selector
var duration: CFTimeInterval = 0.3
var tapCount = 0
init(target: AnyObject, singleAction: Selector, doubleAction: Selector) {
self.target = target
self.singleAction = singleAction
self.doubleAction = doubleAction
}
func fakeAction(g: UITapGestureRecognizer) {
tapCount = tapCount + 1
if tapCount == 1 {
delayHelper(duration, task: {
if self.tapCount == 1 {
NSThread.detachNewThreadSelector(self.singleAction, toTarget:self.target, withObject: g)
}
else if self.tapCount == 2 {
NSThread.detachNewThreadSelector(self.doubleAction, toTarget:self.target, withObject: g)
}
self.tapCount = 0
})
}
}
typealias DelayTask = (cancel : Bool) ->()
func delayHelper(time:NSTimeInterval, task:()->()) -> DelayTask? {
func dispatch_later(block:()->()) {
dispatch_after(
dispatch_time(
DISPATCH_TIME_NOW,
Int64(time * Double(NSEC_PER_SEC))),
dispatch_get_main_queue(),
block)
}
var closure: dispatch_block_t? = task
var result: DelayTask?
let delayedClosure: DelayTask = {
cancel in
if let internalClosure = closure {
if (cancel == false) {
dispatch_async(dispatch_get_main_queue(), internalClosure);
}
}
closure = nil
result = nil
}
result = delayedClosure
dispatch_later {
if let delayedClosure = result {
delayedClosure(cancel: false)
}
}
return result;
}
func cancel(task:DelayTask?) {
task?(cancel: true)
}
}
尽管这个链接可能回答这个问题,但最好在这里包含答案的基本部分,并提供供参考的链接。如果链接页面更改,则仅链接答案可能会失效。 – 2016-04-08 17:38:41
的Markus's斯威夫特3版eladleb's原液充分落实。
创建子文件UIShortTapGestureRecogninzer
import UIKit
import UIKit.UIGestureRecognizerSubclass
class UIShortTapGestureRecognizer: UITapGestureRecognizer {
let tapMaxDelay: Double = 0.3 //anything below 0.3 may cause doubleTap to be inaccessible by many users
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent) {
super.touchesBegan(touches, with: event)
DispatchQueue.main.asyncAfter(deadline: .now() + tapMaxDelay) { [weak self] in
if self?.state != UIGestureRecognizerState.recognized {
self?.state = UIGestureRecognizerState.failed
}
}
}
}
注:当添加UIGestureRecognizer
只doubleTap必须型,需要UIShortTapGestureRecognizer
& singleTap.require(toFail: doubleTap)
的。
func addBoth (views: UIView, selectorSingle: Selector, selectorDouble: Selector) {
let doubleTap:UIShortTapGestureRecognizer = UIShortTapGestureRecognizer(target: self, action: selectorDouble)
doubleTap.numberOfTapsRequired = 2
views.addGestureRecognizer(doubleTap)
let singleTap:UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: selectorSingle)
singleTap.numberOfTapsRequired = 1
singleTap.require(toFail: doubleTap)
views.addGestureRecognizer(singleTap)
}
不,您需要直接处理水龙头以更改计时 – Wain 2015-04-04 21:21:56
我该怎么做?这是“最佳做法”吗? – Nico 2015-04-04 21:24:21
在单元格上并不重要,可能您会使用实现触摸事件方法的自定义子视图。或者,改变你的UI不要使用双击 – Wain 2015-04-04 21:26:14