iOS-如何以编程方式创建WKWebView后退按钮?
我正在尝试为我的iOS WKWebView应用程序创建一个后退按钮,这样当用户单击该按钮时,它会将他们带到上一个WKWebView页面。我已经找到了很多关于如何使用IB而不是直接代码实现这一点的教程。这就是我到目前为止所做的: 原始ViewController.swift:iOS-如何以编程方式创建WKWebView后退按钮?,ios,uibutton,wkwebview,Ios,Uibutton,Wkwebview,我正在尝试为我的iOS WKWebView应用程序创建一个后退按钮,这样当用户单击该按钮时,它会将他们带到上一个WKWebView页面。我已经找到了很多关于如何使用IB而不是直接代码实现这一点的教程。这就是我到目前为止所做的: 原始ViewController.swift: import UIKit import WebKit class ViewController: UIViewController, WKNavigationDelegate { private var webV
import UIKit
import WebKit
class ViewController: UIViewController, WKNavigationDelegate {
private var webView: WKWebView!
let wv = WKWebView(frame: UIScreen.mainScreen().bounds) //needed for working webview
self.webView = WKWebView(frame: frame)
self.webView.navigationDelegate = self
func rightbutton(text: String, action: Selector) {
let rightButton = UIBarButtonItem(title: text, style: .Plain, target: self, action: action)
self.navigationItem.rightBarButtonItem = rightButton
}
func action() {
if self.webView.canGoBack {
print ("Can go back")
self.webView.goBack()
self.webView.reload()
} else {
print ( "Can't go back")
}
}
override func viewDidLoad() {
super.viewDidLoad()
guard let url = NSURL(string: "http://communionchapelefca.org/app-home") else { return }
wv.navigationDelegate = self
wv.loadRequest(NSURLRequest(URL: url))
view.addSubview(wv)
webView.goBack()
webView.reload()
prefButton()
//backButton()
NSNotificationCenter.defaultCenter().addObserver(self,
selector: "receiveNotification:",
name: "BeaconServiceRegionEnter",
object: nil)
NSNotificationCenter.defaultCenter().addObserver(self,
selector: "receiveNotification:",
name: "BeaconServiceRegionUpdate",
object: nil)
NSNotificationCenter.defaultCenter().addObserver(self,
selector: "receiveNotification:",
name: "BeaconServiceRegionExit",
object: nil)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func prefButton () {
let image = UIImage(named: "icon-pref128") as UIImage?
let button = UIButton(type: UIButtonType.Custom) as UIButton
let screenSize: CGRect = UIScreen.mainScreen().bounds
let screenWidth = screenSize.width
let screenHeight = screenSize.height
button.frame = CGRectMake(screenWidth * 0.85, screenHeight * 0.90, 56, 56) // (X, Y, Height, Width)
button.setImage(image, forState: .Normal)
button.addTarget(self, action: "buttonClicked:", forControlEvents:.TouchUpInside)
self.view.addSubview(button)
}
func buttonClicked(sender:UIButton)
{
UIApplication.sharedApplication().openURL(NSURL(string: UIApplicationOpenSettingsURLString)!)
}
func receiveNotification(notification: NSNotification) {
print(notification.userInfo)
}
func webView(webView: WKWebView, decidePolicyForNavigationAction navigationAction: WKNavigationAction, decisionHandler: (WKNavigationActionPolicy) -> Void) {
if navigationAction.navigationType == .LinkActivated {
if let newURL = navigationAction.request.URL,
host = newURL.host where !host.containsString("communionchapelefca.org") &&
UIApplication.sharedApplication().canOpenURL(newURL) {
if UIApplication.sharedApplication().openURL(newURL) {
print(newURL)
print("Redirected to browser. No need to open it locally")
decisionHandler(.Cancel)
} else {
print("browser can not url. allow it to open locally")
decisionHandler(.Allow)
}
} else {
print("Open it locally")
decisionHandler(.Allow)
}
} else {
print("not a user click")
decisionHandler(.Allow)
}
}
}
有什么建议吗?提前谢谢
编辑:附加整个ViewController,而不是代码片段
EDIT2:k8mil的回答很接近,因为他的回答没有加载初始URL。以下是对他的回答的唯一调整:
private func createWebView() {
guard let url = NSURL(string: "http://communionchapelefca.org/app-home") else { return }
let frame = UIScreen.mainScreen().bounds // or different frame created using CGRectMake(x,y,width,height)
self.webView = WKWebView(frame: frame)
self.webView.navigationDelegate = self
self.webView.loadRequest(NSURLRequest(URL: url))
self.view.addSubview(self.webView)
}
尝试在WKWebView实例上调用
webView.goBack()
方法,而不是WKWebView.goBack()
。另外,在goBack()
之后,您可以调用webView.reload()
方法以确保您位于正确的页面上
我编辑了你的代码
import UIKit
import WebKit
class ViewController: UIViewController, WKNavigationDelegate {
private var webView: WKWebView!
override func viewDidLoad() {
super.viewDidLoad()
guard let url = NSURL(string: "http://communionchapelefca.org/app-home") else {
return
}
//create WebView and Back button
createWebView()
backButton()
prefButton()
NSNotificationCenter.defaultCenter().addObserver(self,
selector: "receiveNotification:",
name: "BeaconServiceRegionEnter",
object: nil)
NSNotificationCenter.defaultCenter().addObserver(self,
selector: "receiveNotification:",
name: "BeaconServiceRegionUpdate",
object: nil)
NSNotificationCenter.defaultCenter().addObserver(self,
selector: "receiveNotification:",
name: "BeaconServiceRegionExit",
object: nil)
}
private func createWebView() {
let frame = UIScreen.mainScreen().bounds // or different frame created using CGRectMake(x,y,width,height)
self.webView = WKWebView(frame: frame)
self.webView.navigationDelegate = self
self.view.addSubview(self.webView)
}
func addBackButton(text: String, action: Selector) {
//this function will add Button on your navigation bar e
let rightButton = UIBarButtonItem(title: text, style: .Plain, target: self, action: action)
self.navigationItem.rightBarButtonItem = rightButton
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func prefButton() {
let image = UIImage(named: "icon-pref128") as UIImage?
let button = UIButton(type: UIButtonType.Custom) as UIButton
let screenSize: CGRect = UIScreen.mainScreen().bounds
let screenWidth = screenSize.width
let screenHeight = screenSize.height
button.frame = CGRectMake(screenWidth * 0.85, screenHeight * 0.90, 56, 56) // (X, Y, Height, Width)
button.setImage(image, forState: .Normal)
button.addTarget(self, action: "buttonClicked:", forControlEvents: .TouchUpInside)
self.view.addSubview(button)
}
func backButton() {
let image = UIImage(named: "icon-back") as UIImage?
let button = UIButton(type: UIButtonType.Custom) as UIButton
let screenSize: CGRect = UIScreen.mainScreen().bounds
let screenWidth = screenSize.width
let screenHeight = screenSize.height
button.frame = CGRectMake(screenWidth * 0.85, screenHeight * 0.90, 56, 56) // (X, Y, Height, Width)
button.setImage(image, forState: .Normal)
button.addTarget(self, action: "customGoBack:", forControlEvents: .TouchUpInside)
self.view.addSubview(button)
}
func customGoBack(sender: UIButton) {
if self.webView.canGoBack {
print("Can go back")
self.webView.goBack()
self.webView.reload()
} else {
print("Can't go back")
}
}
func buttonClicked(sender: UIButton) {
UIApplication.sharedApplication().openURL(NSURL(string: UIApplicationOpenSettingsURLString)!)
}
func receiveNotification(notification: NSNotification) {
print(notification.userInfo)
}
func webView(webView: WKWebView, decidePolicyForNavigationAction navigationAction: WKNavigationAction, decisionHandler: (WKNavigationActionPolicy) -> Void) {
if navigationAction.navigationType == .LinkActivated {
if let newURL = navigationAction.request.URL,
host = newURL.host where !host.containsString("communionchapelefca.org") &&
UIApplication.sharedApplication().canOpenURL(newURL) {
if UIApplication.sharedApplication().openURL(newURL) {
print(newURL)
print("Redirected to browser. No need to open it locally")
decisionHandler(.Cancel)
} else {
print("browser can not url. allow it to open locally")
decisionHandler(.Allow)
}
} else {
print("Open it locally")
decisionHandler(.Allow)
}
} else {
print("not a user click")
decisionHandler(.Allow)
}
}
}
此外,您不需要另一个WKWebView实例,因为您以前在中声明过:
private-var-webView:WKWebView代码>
因此,没有必要:
wv.navigationDelegate = self
wv.loadRequest(NSURLRequest(URL: url))
view.addSubview(wv)
对我来说这很有效
希望这能对您有所帮助:)我想我在代码中正确地添加了您的建议,但我在self.webView=WKWebView(frame:frame)
行中得到了一个“预期声明”。想法?查看编辑后的答案,并让我知道它是否有效;)你的答案很接近,但我不得不修改webview部分,因为最初的网站没有加载。我把稍微修改过的版本放在OP里。非常感谢你的帮助!