[英]Swipe gesture in Swift 3
我试图让 UISwipeGestureRecognizer 在 Swift 3 中工作,默认的向右滑动工作正常,但不是向上或向左滑动。
我已经通过控制拖动一个动作来尝试过
@IBAction func hole(_ recognizer: UISwipeGestureRecognizer) {
if (recognizer.direction == UISwipeGestureRecognizerDirection.left)
{
print("left")
}else if recognizer.direction == .right {
print("right")
}else {
print("other")
}
}
并且,在 ViewDidLoad
//gesture recognisers
let swipeRight = UISwipeGestureRecognizer(target: self, action: "holeSwiped:")
swipeRight.direction = UISwipeGestureRecognizerDirection.right
self.view.addGestureRecognizer(swipeRight)
let swipeLeft = UISwipeGestureRecognizer(target: self, action: "holeSwiped:")
swipeLeft.direction = UISwipeGestureRecognizerDirection.left
self.view.addGestureRecognizer(swipeLeft)
到我的方法
func holeSwiped(gesture: UISwipeGestureRecognizer)
{
if let swipeGesture = gesture as? UISwipeGestureRecognizer{
switch swipeGesture.direction {
case UISwipeGestureRecognizerDirection.right:
print("right swipe")
case UISwipeGestureRecognizerDirection.left:
print("left swipe")
default:
print("other swipe")
}
}
}
现在,除了默认权限之外,所有滑动都不起作用。 有任何想法吗?
步骤 1:在viewDidLoad()方法中添加滑动手势。
override func viewDidLoad() {
super.viewDidLoad()
let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(handleGesture))
swipeLeft.direction = .left
self.view.addGestureRecognizer(swipeLeft)
let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(handleGesture))
swipeRight.direction = .right
self.view.addGestureRecognizer(swipeRight)
let swipeUp = UISwipeGestureRecognizer(target: self, action: #selector(handleGesture))
swipeUp.direction = .up
self.view.addGestureRecognizer(swipeUp)
let swipeDown = UISwipeGestureRecognizer(target: self, action: #selector(handleGesture))
swipeDown.direction = .down
self.view.addGestureRecognizer(swipeDown)
}
第 2 步:检查handleGesture()方法中的手势检测
func handleGesture(gesture: UISwipeGestureRecognizer) -> Void {
if gesture.direction == .right {
print("Swipe Right")
}
else if gesture.direction == .left {
print("Swipe Left")
}
else if gesture.direction == .up {
print("Swipe Up")
}
else if gesture.direction == .down {
print("Swipe Down")
}
}
我希望这会帮助某人。
更新:
您需要使用 @objc 为最新的 swift 版本调用您的“选择器”方法。 IE,
@objc func handleGesture(gesture: UISwipeGestureRecognizer) -> Void {
.
.
.
}
Swift 4, Xcode 9.2 此代码将使您能够在整个 ViewController 上识别用户的滑动方向(所有 iPhone 屏幕,而不是特定于按钮)谢谢@Ram-madhavan
import UIKit
class ViewController: UIViewController {
//Label to show test and see Gesture direction.
@IBOutlet weak var swipeDirectionLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
//Defining the Various Swipe directions (left, right, up, down)
let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(self.handleGesture(gesture:)))
swipeLeft.direction = .left
self.view.addGestureRecognizer(swipeLeft)
let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(self.handleGesture(gesture:)))
swipeRight.direction = .right
self.view.addGestureRecognizer(swipeRight)
let swipeUp = UISwipeGestureRecognizer(target: self, action: #selector(self.handleGesture(gesture:)))
swipeUp.direction = .up
self.view.addGestureRecognizer(swipeUp)
let swipeDown = UISwipeGestureRecognizer(target: self, action: #selector(self.handleGesture(gesture:)))
swipeDown.direction = .down
self.view.addGestureRecognizer(swipeDown)
}
//Function to Print to console Swipe Direction, and Change the label to show the directions. The @objc before func is a must, since we are using #selector (above). You can add to the function, in my case, I'll add a sound, so when someone flips the page, it plays a page sound.
@objc func handleGesture(gesture: UISwipeGestureRecognizer) -> Void {
if gesture.direction == UISwipeGestureRecognizerDirection.right {
print("Swipe Right")
swipeDirectionLabel.text = "Swiped Right"
}
else if gesture.direction == UISwipeGestureRecognizerDirection.left {
print("Swipe Left")
swipeDirectionLabel.text = "Swiped Left"
}
else if gesture.direction == UISwipeGestureRecognizerDirection.up {
print("Swipe Up")
swipeDirectionLabel.text = "Swiped Up"
}
else if gesture.direction == UISwipeGestureRecognizerDirection.down {
print("Swipe Down")
swipeDirectionLabel.text = "Swiped Down"
}
}
}
我遇到了同样的问题。 实际上,任何滑动都会使我的代码崩溃(来自 Rob Percival,对吧?)。 于是我下载了他完成的代码,在XCode 8中打开,让其转换为Swift 3。有两点改变。
In ViewDidLoad:
let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(ViewController.swiped(_:)))
在函数内部:
func swiped(_ gesture: UIGestureRecognizer)
在 Swift 3 中你可以试试这个。
let swipeRightOrange = UISwipeGestureRecognizer(target: self, action:#selector(slideToRightWithGestureRecognizer))
swipeRightOrange.direction = UISwipeGestureRecognizerDirection.Right;
let swipeLeftOrange:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(slideToLeftWithGestureRecognizer))
swipeLeftOrange.direction = UISwipeGestureRecognizerDirection.Left;
@IBAction func slideToLeftWithGestureRecognizer(gestureRecognizer:UISwipeGestureRecognizer)
{
viewOrange.backgroundColor = UIColor.blueColor()
}
@IBAction func slideToRightWithGestureRecognizer
(gestureRecognizer:UISwipeGestureRecognizer)
{
viewOrange.backgroundColor = UIColor.lightGrayColor()
}
var swipeGesture = UISwipeGestureRecognizer()
查看并设置IBOutlet:
@IBOutlet weak var viewSwipe: UIView!
在 viewDidLoad() 上写这个漂亮的代码
let direction: [UISwipeGestureRecognizerDirection] = [.up, .down, .left, .right]
for dir in direction{
swipeGesture = UISwipeGestureRecognizer(target: self, action: #selector(self.swipeView(_:)))
viewSwipe.addGestureRecognizer(swipeGesture)
swipeGesture.direction = dir
viewSwipe.isUserInteractionEnabled = true
viewSwipe.isMultipleTouchEnabled = true
}
现在,这是在识别滑动手势时调用的方法。
@objc func swipeView(_ sender:UISwipeGestureRecognizer){
UIView.animate(withDuration: 1.0) {
if sender.direction == .right{
self.viewSwipe.frame = CGRect(x: self.view.frame.size.width - self.viewSwipe.frame.size.width, y: self.viewSwipe.frame.origin.y, width: self.viewSwipe.frame.size.width, height: self.viewSwipe.frame.size.height)
}else if sender.direction == .left{
self.viewSwipe.frame = CGRect(x: 0, y: self.viewSwipe.frame.origin.y, width: self.viewSwipe.frame.size.width, height: self.viewSwipe.frame.size.height)
}else if sender.direction == .up{
self.viewSwipe.frame = CGRect(x: self.view.frame.size.width - self.viewSwipe.frame.size.width, y: 0, width: self.viewSwipe.frame.size.width, height: self.viewSwipe.frame.size.height)
}else if sender.direction == .down{
self.viewSwipe.frame = CGRect(x: self.view.frame.size.width - self.viewSwipe.frame.size.width, y: self.view.frame.size.height - self.viewSwipe.frame.size.height, width: self.viewSwipe.frame.size.width, height: self.viewSwipe.frame.size.height)
}
}
}
100% 在我的项目中工作并经过测试
func holeSwiped(gesture: UISwipeGestureRecognizer)
{
if let swipeGesture = gesture as? UISwipeGestureRecognizer{
switch swipeGesture.direction {
case UISwipeGestureRecognizerDirection.right:
NSLog("right swipe")
case UISwipeGestureRecognizerDirection.left:
NSLog("left swipe")
default:
NSLog("other swipe")
}
}
}
我想发生的事情是因为您首先添加了右滑动手势识别器,即采用所有手势,而不是将任何手势传递给左滑动手势识别器。
我的建议是查看require(toFail:)
及其类似的方法。
这将允许您定义哪些手势识别器需要在其他人接收手势之前失败。 例如,您可以告诉左滑动手势识别器它需要右滑动手势识别器失败。 然后,如果右滑动手势识别器接收到一个手势但不是右滑动,它会将手势传递给左滑动手势识别器。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.