我在我的应用中有一个WebView。
由于它是一个选项卡应用程序,我无法添加用于在网站上回退/前进的按钮。
我想通过滑动来回退/前进。从左侧/边缘向右滑动就是回退...就像iOS的Safari浏览器一样。
我该怎么做?我认为我应该使用“屏幕边缘平移手势识别器”,对吗?
我在我的应用中有一个WebView。
由于它是一个选项卡应用程序,我无法添加用于在网站上回退/前进的按钮。
我想通过滑动来回退/前进。从左侧/边缘向右滑动就是回退...就像iOS的Safari浏览器一样。
我该怎么做?我认为我应该使用“屏幕边缘平移手势识别器”,对吗?
在 Swift 3 中被接受的答案:
override func viewDidLoad() {
super.viewDidLoad()
let swipeLeftRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipe(recognizer:)))
let swipeRightRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipe(recognizer:)))
swipeLeftRecognizer.direction = .left
swipeRightRecognizer.direction = .right
webView.addGestureRecognizer(swipeLeftRecognizer)
webView.addGestureRecognizer(swipeRightRecognizer)
}
@objc private func handleSwipe(recognizer: UISwipeGestureRecognizer) {
if (recognizer.direction == .left) {
if webView.canGoForward {
webView.goForward()
}
}
if (recognizer.direction == .right) {
if webView.canGoBack {
webView.goBack()
}
}
}
使用 Swift 3 和 Swift 4 回答
如果任何人仍然遇到问题。这对我起作用:
查找 "didFinish",添加/替换以下代码。
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
self.didFinish()
webView.allowsBackForwardNavigationGestures = true
}
你需要的主要代码只有一行。它在self.didFinish()之后,但仍在{}括号内。
webView.allowsBackForwardNavigationGestures = true
UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
// Setting the swipe direction.
[swipeLeft setDirection:UISwipeGestureRecognizerDirectionLeft];
[swipeRight setDirection:UISwipeGestureRecognizerDirectionRight];
// Adding the swipe gesture on WebView
[webView addGestureRecognizer:swipeLeft];
[webView addGestureRecognizer:swipeRight];
- (void)handleSwipe:(UISwipeGestureRecognizer *)swipe {
if (swipe.direction == UISwipeGestureRecognizerDirectionLeft) {
NSLog(@"Left Swipe");
}
if (swipe.direction == UISwipeGestureRecognizerDirectionRight) {
NSLog(@"Right Swipe");
}
}
Add the following lines of code in viewDidLoad()
let leftSwipe = UISwipeGestureRecognizer(target: webViewBox, action: #selector(webViewBox.goForward))
leftSwipe.direction = .left
webViewBox.addGestureRecognizer(leftSwipe)
let rightSwipe = UISwipeGestureRecognizer(target: webViewBox, action: #selector(webViewBox.goBack))
leftSwipe.direction = .right
webViewBox.addGestureRecognizer(rightSwipe)
你最终的结果应该像这样:
import UIKit
import WebKit
class ViewController: UIViewController {
@IBOutlet weak var webViewBox: WKWebView!
override func viewDidLoad() {
super.viewDidLoad()
//URL request:
let urlReq = URLRequest(url: URL(string: "https://www.google.co.in")!)
//Load the URL:
webViewBox.load(urlReq)
//To go forward:
let leftSwipe = UISwipeGestureRecognizer(target: webViewBox, action: #selector(webViewBox.goForward))
leftSwipe.direction = .left
webViewBox.addGestureRecognizer(leftSwipe)
//To go back:
let rightSwipe = UISwipeGestureRecognizer(target: webViewBox, action: #selector(webViewBox.goBack))
rightSwipe.direction = .right
webViewBox.addGestureRecognizer(rightSwipe)
}
}
WKWebView
有allowsBackForwardNavigationGestures
属性,而UIWebView
没有。 - user6553825