问题
I'm very new to developing. I'm building a WebView and I want it to have pull to refresh capabilities. How do I go about doing that in swift?
My code in the View Controller is
@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()
}
回答1:
Your code is buggy you added two Web view Delegate in side the ViewDidLoad method that must be following and check the following viewDidLoad code for adding Pull to Refresh in web view:
@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()
}
}
回答2:
Following code will put the refresh control in scrollview of webview.Initially it will load google.com. To see pull to refresh clearly I have set white color to the background of scroll view so it is clearly visible and on pull to refresh webview opens facebook page.
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))
}
}
回答3:
You can use this one
Write this in DidLoad method
webViewHome.scrollView.delegate = self;And then write this method
#pragma mark Scrollview delegate
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset{ if (scrollView.contentOffset.y < 0){ DLog(@" webview on top "); [self AgainCheckInternet:nil]; } }
Note: Please make sure you didn't set scrollview bounces property to No otherwise this method will not call
来源：https://stackoverflow.com/questions/36256448/how-do-i-add-pull-to-refresh-in-webview