我很擅长开发。我正在构建一个WebView，我希望它具有拉动刷新功能。我如何在swift中做到这一点？
我在View Controller中的代码是
@IBOutlet var webView: UIWebView!
override func viewDidLoad() {
super.viewDidLoad()
func webViewDidFinishLoad(webView: UIWebView) {
UIApplication.sharedApplication().networkActivityIndicatorVisible = false
}
func webViewDidStartLoad(webView: UIWebView) {
UIApplication.sharedApplication().networkActivityIndicatorVisible = true
}
let url = NSURL (string: "https://www.foo.com");
let requestObj = NSURLRequest(URL: url!);
webView.loadRequest(requestObj);
NSUserDefaults.standardUserDefaults().registerDefaults(["UserAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/601.5.17 (KHTML, like Gecko) Version/9.1 Safari/601.5.17"])
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
答案 0 :(得分：3)
您的代码有问题，您在必须遵循的ViewDidLoad方法中添加了两个Web视图委托，并检查以下viewDidLoad代码，以便在Web视图中添加Pull to Refresh：
@IBOutlet var webView: UIWebView!
var refController:UIRefreshControl = UIRefreshControl()
override func viewDidLoad() {
super.viewDidLoad()
let url = NSURL (string: "https://www.foo.com");
let requestObj = NSURLRequest(URL: url!);
webView.loadRequest(requestObj);
NSUserDefaults.standardUserDefaults().registerDefaults(["UserAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/601.5.17 (KHTML, like Gecko) Version/9.1 Safari/601.5.17"])
refController.bounds = CGRectMake(0, 50, refController.bounds.size.width, refController.bounds.size.height)
refController.addTarget(self, action: Selector("mymethodforref:"), forControlEvents: UIControlEvents.ValueChanged)
refController.attributedTitle = NSAttributedString(string: "Pull to refresh")
webView.scrollView.addSubview(refController)
}
func mymethodforref(refresh:UIRefreshControl){
webView.reload()
refController.endRefreshing()
}
func webViewDidFinishLoad(webView: UIWebView) {
UIApplication.sharedApplication().networkActivityIndicatorVisible = false
}
func webViewDidStartLoad(webView: UIWebView) {
UIApplication.sharedApplication().networkActivityIndicatorVisible = true
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
答案 1 :(得分：2)
extension WKWebView {
var refreshControl: UIRefreshControl? { (scrollView.getAllSubviews() as [UIRefreshControl]).first }
enum PullToRefreshType {
case none
case embed
case custom(target: Any, selector: Selector)
}
func setPullToRefresh(type: PullToRefreshType) {
(scrollView.getAllSubviews() as [UIRefreshControl]).forEach { $0.removeFromSuperview() }
switch type {
case .none: break
case .embed: _setPullToRefresh(target: self, selector: #selector(webViewPullToRefreshHandler(source:)))
case .custom(let params): _setPullToRefresh(target: params.target, selector: params.selector)
}
}
private func _setPullToRefresh(target: Any, selector: Selector) {
let refreshControl = UIRefreshControl()
refreshControl.addTarget(target, action: selector, for: .valueChanged)
scrollView.addSubview(refreshControl)
}
@objc func webViewPullToRefreshHandler(source: UIRefreshControl) {
guard let url = self.url else { source.endRefreshing(); return }
load(URLRequest(url: url))
}
}
// https://stackoverflow.com/a/47282118/4488252
extension UIView {
class func getAllSubviews<T: UIView>(from parenView: UIView) -> [T] {
return parenView.subviews.flatMap { subView -> [T] in
var result = getAllSubviews(from: subView) as [T]
if let view = subView as? T { result.append(view) }
return result
}
}
func getAllSubviews<T: UIView>() -> [T] { return UIView.getAllSubviews(from: self) as [T] }
}
设置
import UIKit
import WebKit
class ViewController2: UIViewController {
private weak var webView: WKWebView!
override func viewDidLoad() {
super.viewDidLoad()
// ... create webView here
webView.navigationDelegate = self
}
}
// MARK: WKNavigationDelegate
extension ViewController2: WKNavigationDelegate {
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
webView.refreshControl?.endRefreshing()
}
func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) {
webView.refreshControl?.endRefreshing()
}
func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) {
webView.refreshControl?.endRefreshing()
}
}
激活拉动以刷新（选项1）
webView.setPullToRefresh(type: .embed)
激活拉动以刷新（选项2）
@objc func customPullToRefreshHandler(source: UIRefreshControl) {
guard let url = webView.url else { source.endRefreshing(); return }
webView.load(URLRequest(url: url))
}
// ....
webView.setPullToRefresh(type: .custom(target: self, selector: #selector(customPullToRefreshHandler(source:))))
停用拉动以刷新
webView.setPullToRefresh(type: .none)
不要忘记在此处粘贴解决方案代码
import UIKit
import WebKit
class ViewController: UIViewController {
private weak var webView: WKWebView!
override func viewDidLoad() {
super.viewDidLoad()
createWebView()
webView.load("https://google.com")
// Way 1
webView.setPullToRefresh(type: .embed)
// Way 2
// webView.setPullToRefresh(type: .custom(target: self, selector: #selector(customPullToRefreshHandler(source:))))
}
private func createWebView() {
let webView = WKWebView(frame: .zero, configuration: .init())
view.addSubview(webView)
webView.navigationDelegate = self
self.webView = webView
webView.translatesAutoresizingMaskIntoConstraints = false
webView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
webView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
view.bottomAnchor.constraint(equalTo: webView.bottomAnchor).isActive = true
view.rightAnchor.constraint(equalTo: webView.rightAnchor).isActive = true
}
// @objc func customPullToRefreshHandler(source: UIRefreshControl) {
// guard let url = webView.url else { source.endRefreshing(); return }
// webView.load(URLRequest(url: url))
// print("WebView started loading")
// }
}
// MARK: WKNavigationDelegate
extension ViewController: WKNavigationDelegate {
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
webView.refreshControl?.endRefreshing()
}
func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) {
webView.refreshControl?.endRefreshing()
}
func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) {
webView.refreshControl?.endRefreshing()
}
}
extension WKWebView {
func load(_ urlString: String) {
guard let url = URL(string: urlString) else { return }
load(URLRequest(url: url))
}
}
答案 2 :(得分：1)
以下代码会将刷新控件放在webview的scrollview中。最初它会加载google.com。为了看清楚刷新，我已经将白色设置为滚动视图的背景，因此它清晰可见，并且在拉动以刷新webview打开Facebook页面。
class ViewController: UIViewController,UIWebViewDelegate {
@IBOutlet weak var webView: UIWebView!
var refreshControl:UIRefreshControl?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.refreshControl = UIRefreshControl.init()
refreshControl!.addTarget(self, action:#selector(refreshControlClicked), for: UIControlEvents.valueChanged)
self.webView.scrollView.addSubview(self.refreshControl!)
self.webView.scrollView.backgroundColor = UIColor.white
self.webView.delegate = self
let url:URL = URL.init(string:"https://www.google.com")!
self.loadRequestWithUrl(URLRequest.init(url: url))
}
func webViewDidStartLoad(_ webView: UIWebView) {
NSLog("website loaded")
}
func loadRequestWithUrl(_ urlRequest : URLRequest?){
if(urlRequest != nil){
self.webView.loadRequest(urlRequest!)
}
}
func refreshControlClicked(){
let url:URL = URL.init(string:"https://www.facebook.com")!
self.loadRequestWithUrl(URLRequest.init(url: url))
}
}
答案 3 :(得分：1)
您可以使用此
在DidLoad方法中写入
webViewHome.scrollView.delegate = self;
然后编写此方法
#pragma标记Scrollview委托
注意：请确保未将scrollview bounces属性设置为“否”，否则此方法将不会调用