Add activity indicator to web view - ios

Question

I want to add activity indicator to a web view.
But i don't know when web view finish loading.
I start animating in viewdidload..

Answer 1

You shouldn't start animating in viewDidLoad. Conform to the
UIWebViewDelegate
protocol and make your web view's delegate your view controller, then use the delegate methods:
#interface MyVC: UIViewController <UIWebViewDelegate> {
UIWebView *webView;
UIActivityIndicatorView *activityIndicator;
}
#end
#implementation MyVC
- (id)init
{
self = [super init];
// ...
activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
activityIndicator.frame = CGRectMake(x, y, w, h);
[self.view addSubview:activityIndicator];
webView = [[UIWebView alloc] initWithFrame:CGRectMake(x, y, w, h)];
webView.delegate = self;
// ...
return self;
}
- (BOOL)webView:(UIWebView *)wv shouldStartLoadWithRequest:(NSURLRequest *)rq
{
[activityIndicator startAnimating];
return YES;
}
- (void)webViewDidFinishLoading:(UIWebView *)wv
{
[activityIndicator stopAnimating];
}
- (void)webView:(UIWebView *)wv didFailLoadWithError:(NSError *)error
{
[activityIndicator stopAnimating];
}
#end

Answer 2

Implement the UIWebViewDelegate protocol
These are the delegates you need to implement in your code:
- (void)webViewDidStartLoad:(UIWebView *)webView; //a web view starts loading
- (void)webViewDidFinishLoad:(UIWebView *)webView;//web view finishes loading
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error; //web view failed to load

Answer 3

You will want to listen for the web view delegate callbacks to correctly show your activity indicator.
Specifically you will want to listen for:
webViewDidStartLoad: (start your activity indicator animation)
webViewDidFinishLoad: (end it)
webView:didFailLoadWithError: (end it)
http://developer.apple.com/library/ios/#documentation/uikit/reference/UIWebViewDelegate_Protocol/Reference/Reference.html

Answer 4

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.webViewRef.delegate = self;
NSURL *websiteUrl = [NSURL URLWithString:Constants.API_TERMS_AND_CONDITIONS_URL];
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:websiteUrl];
[self.webViewRef loadRequest:urlRequest];
}
#pragma mark
#pragma mark -- UIWebViewDelegate
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
[self.activityIndicator startAnimating];
return YES;
}
- (void)webViewDidStartLoad:(UIWebView *)webView{
[self.activityIndicator startAnimating];
}
- (void)webViewDidFinishLoad:(UIWebView *)webView{
[self.activityIndicator stopAnimating];
self.activityIndicator.hidden = YES;
}
- (void)webView:(UIWebView *)webView didFailLoadWithError:(nullable NSError *)error{
[self.activityIndicator stopAnimating];
self.activityIndicator.hidden = YES;
}