问题
I have a wkwebview in my app, and I want to add an activity indicator to it. I want it to where it appears when the webview is loading and disappears whenever it is finished loading, it disappears. Can you give me some code to do this? Here's my code right now:
@IBOutlet weak var Activity: UIActivityIndicatorView!
var webView : WKWebView!
@IBOutlet var containerView: UIView? = nil
override func viewDidLoad() {
super.viewDidLoad()
guard let url = URL(string: "http://ifunnyvlogger.wixsite.com/ifunnyvlogger/app-twitter") else { return }
webView = WKWebView(frame: self.view.frame)
webView.translatesAutoresizingMaskIntoConstraints = false
webView.isUserInteractionEnabled = true
webView.navigationDelegate = self
self.view.addSubview(self.webView)
let request = URLRequest(url: url)
webView.load(request)
}
func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
// Check if a link was clicked
if navigationAction.navigationType == .linkActivated {
// Verify the url
guard let url = navigationAction.request.url else { return }
let shared = UIApplication.shared
// Check if opening in Safari is allowd
if shared.canOpenURL(url) {
// Ask the user if they would like to open link in Safari
let alert = UIAlertController(title: "Do you want to open Safari?", message: nil, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Yes", style: .default, handler: { (alert: UIAlertAction) -> Void in
// User wants to open in Safari
shared.open(url, options: [:], completionHandler: nil)
}))
alert.addAction(UIAlertAction(title: "Opps, no.", style: .cancel, handler: nil))
present(alert, animated: true, completion: nil)
}
decisionHandler(.cancel)
}
decisionHandler(.allow)
}
func webViewDidStartLoad(_ : WKWebView) {
Activity.startAnimating()
}
func webViewDidFinishLoad(_ : WKWebView) {
Activity.startAnimating()
}
I'm creating an IOS app using xcode 8 and swift 3
回答1:
Please, below code which is working fine.
@IBOutlet weak var Activity: UIActivityIndicatorView!
var webView : WKWebView!
@IBOutlet var containerView: UIView? = nil
override func viewDidLoad() {
super.viewDidLoad()
guard let url = URL(string: "http://www.facebook.com") else { return }
webView = WKWebView(frame: self.view.frame)
webView.translatesAutoresizingMaskIntoConstraints = false
webView.isUserInteractionEnabled = true
webView.navigationDelegate = self
self.view.addSubview(self.webView)
let request = URLRequest(url: url)
webView.load(request)
// add activity
self.webView.addSubview(self.Activity)
self.Activity.startAnimating()
self.webView.navigationDelegate = self
self.Activity.hidesWhenStopped = true
}
Implement below these two delegate method:
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
Activity.stopAnimating()
}
func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) {
Activity.stopAnimating()
}
Let me know if it is not working.
回答2:
import UIKit
import WebKit
class ViewController: UIViewController, WKNavigationDelegate, WKUIDelegate {
var webView: WKWebView!
var activityIndicator: UIActivityIndicatorView!
override func viewDidLoad() {
webView = WKWebView(frame: CGRect.zero)
webView.navigationDelegate = self
webView.uiDelegate = self
view.addSubview(webView)
activityIndicator = UIActivityIndicatorView()
activityIndicator.center = self.view.center
activityIndicator.hidesWhenStopped = true
activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.gray
view.addSubview(activityIndicator)
webView.load(URLRequest(url: URL(string: "http://google.com")!))
}
func showActivityIndicator(show: Bool) {
if show {
activityIndicator.startAnimating()
} else {
activityIndicator.stopAnimating()
}
}
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
showActivityIndicator(show: false)
}
func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
showActivityIndicator(show: true)
}
func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) {
showActivityIndicator(show: false)
}
}
回答3:
In viewDidLoad you need to add the activityIndicator as a subView just as you did for your webView. Since it's an outlet, make sure the activityIndicator sits on top of your webView and you should be good to go. You also want to set activity.hidden to true when the webView stops loading.
It's also a good rule of thumb to lower case your 'Activity' outlet.
override func viewDidLoad() {
super.viewDidLoad()
self.view.addSubview(self.Activity)
guard let url = URL(string: "http://ifunnyvlogger.wixsite.com/ifunnyvlogger/app-twitter") else { return }
webView = WKWebView(frame: self.view.frame)
webView.translatesAutoresizingMaskIntoConstraints = false
webView.isUserInteractionEnabled = true
webView.navigationDelegate = self
self.view.addSubview(self.webView)
let request = URLRequest(url: url)
webView.load(request)
You also call activity.startAnimating in webViewDidFinishLoad(). Make sure you call activity.stopAnimating() when the webView finishes loading. Happy coding!
func webViewDidFinishLoad(_ : WKWebView) {
Activity.stopAnimating()
Activity.hidden = true
}
回答4:
Swift 5 Version
The concept is simple enough to be ported to earlier swift versions.
This is a class we would use as a parent class anywhere we want a webview.
import UIKit
import WebKit
class CustomWebViewController: UIViewController, WKNavigationDelegate {
var activityIndicator: UIActivityIndicatorView!
override func viewDidLoad() {
super.viewDidLoad()
activityIndicator = UIActivityIndicatorView()
activityIndicator.center = self.view.center
activityIndicator.hidesWhenStopped = true
activityIndicator.style = .gray
activityIndicator.isHidden = true
view.addSubview(activityIndicator)
}
func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
activityIndicator.isHidden = false
activityIndicator.startAnimating()
}
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
activityIndicator.stopAnimating()
activityIndicator.isHidden = true
}
}
If we have a UIViewController with a webview, we can just inherit from CustomWebViewController and it will take care of the rest for us. Remember to connect the webview IBOutlet.
import UIKit
import WebKit
class FirstViewController: CustomWebViewController {
@IBOutlet var webView: WKWebView!
override func viewDidLoad() {
super.viewDidLoad()
webView.navigationDelegate = self
let url = URL(string: "https://google.com")
webView.load(URLRequest(url: url!))
}
}
回答5:
import UIKit
import WebKit
class ViewController: UIViewController, WKNavigationDelegate, WKUIDelegate {
var webView: WKWebView!
var activityIndicator: UIActivityIndicatorView!
override func viewDidLoad() {
webView = WKWebView(frame: CGRect.zero)
webView.navigationDelegate = self;
webView.uiDelegate = self
activityIndicator = UIActivityIndicatorView()
activityIndicator.hidesWhenStopped = true
activityIndicator.center = self.view.center
activityIndicator.style = UIActivityIndicatorView.Style.large
webView.addSubview(activityIndicator)
view = webView
let load_url = URL(string: "https://google.com/")!
webView.load(URLRequest(url: load_url))
activityIndicator.startAnimating()
let refresh = UIBarButtonItem(barButtonSystemItem: .refresh, target: webView, action: #selector(webView.reload))
toolbarItems = [refresh]
navigationController?.isToolbarHidden = false
}
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
title = webView.title
activityIndicator.stopAnimating()
}
func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
activityIndicator.startAnimating()
}
func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) {
activityIndicator.stopAnimating()
}
}
回答6:
Please try the below code its working fine for me and please let me know if anything is wrong in it thanks in advance.
import UIKit
import WebKit
class WebViewController: UIViewController, WKUIDelegate, WKNavigationDelegate {
@IBOutlet weak var contentView: UIView!
@IBOutlet weak var activityIndicatorView: UIActivityIndicatorView!
override func viewDidLoad() {
super.viewDidLoad()
setupView()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
self.setupWebView()
self.loadData()
}
fileprivate func setupView() {
self.contentView.isHidden = true
self.activityIndicatorView.startAnimating()
}
fileprivate func setupWebView() {
let webConfiguration = WKWebViewConfiguration()
webView = WKWebView(frame: contentView.bounds, configuration: webConfiguration)
webView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
self.contentView.addSubview(webView)
self.webView.allowsBackForwardNavigationGestures = true
webView.uiDelegate = self
webView.navigationDelegate = self
}
fileprivate func loadData() {
if let url = URL(string: "http://google.com) {
/// For loading PDF content
if contentType == .pdf {
if let data = try? Data(contentsOf: url) {
self.webView.load(data, mimeType: "application/pdf", characterEncodingName: "", baseURL: url)
}
} else {
let request = URLRequest(url: url)
webView.load(request)
}
}
}
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
activityIndicatorView.stopAnimating()
self.contentView.isHidden = false
}
func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) {
activityIndicatorView.stopAnimating()
}
}
来源：https://stackoverflow.com/questions/40819656/how-to-add-activity-indicator-to-wkwebview-swift-3