在 iOS 中的 webview 上添加显示加载页面的进度对话框

Question

我是 iOS 开发的新手。有什么方法可以在 webview 上显示一个进度对话框，该对话框在页面加载时显示加载页面并在页面加载后关闭。

请推荐一些好的教程

提前致谢

这是我正在做的代码，但没有显示

@interface ViewController ()
@property (strong, nonatomic) UIActivityIndicatorView*loadingIndicator;
@end

@implementation ViewController
@synthesize myWebview;

- (void)viewDidLoad {
self.myWebview.delegate = (id<UIWebViewDelegate>)[self class];
UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];          
activityIndicator.center = self.myWebview.center;
[activityIndicator setHidden:YES];
self.loadingIndicator=activityIndicator;
[self.view addSubview:self.loadingIndicator];
NSURL *url=[NSURL URLWithString:@"http://getaservice.pk/joomla"];
self.myWebview.delegate = (id<UIWebViewDelegate>)[self class];
NSURLRequest *request=[NSURLRequest requestWithURL:url];
[myWebview loadRequest:request];
[super viewDidLoad];


}
// Do any additional setup after loading the view, typically from a nib.

     -(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request     navigationType:(UIWebViewNavigationType)navigationType
{
[self.loadingIndicator startAnimating] ;
[self.loadingIndicator setHidden:NO];
return YES;
}

-(void)webViewDidFinishLoad:(UIWebView *)webView
{
[self.loadingIndicator setHidden:YES];
[self.loadingIndicator stopAnimating] ;
}

-(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
[self.loadingIndicator setHidden:YES];
[self.loadingIndicator stopAnimating] ;
 }

 - (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
 }

 - (IBAction)button:(id)sender {

}
@end

Answer 1

在您的视图中获取一个活动指示器并将其放置在屏幕或 webview 的中心。默认隐藏活动指示器。

现在，当您加载网页时，然后显示活动指示器，直到您的网页完全加载。

-(void)webViewDidFinishLoad:(UIWebView *)webView1{
if (webView1.isLoading){
    return;
}
[self.activityView stopAnimating];
self.activityView.hidden = TRUE;

}

Answer 2

@interface
// declare a loading indicator
@property (strong, nonatomic) UIActivityIndicatorView*loadingIndicator;

- (void)viewDidLoad {
        self.webview.delegate = (id<UIWebViewDelegate>)[self class];
        UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
        activityIndicator.center = self.webview.center;
        [activityIndicator setHidden:YES];
        self.loadingIndicator=activityIndicator;
        [self.view addSubview:self.loadingIndicator];
        [super viewDidLoad];
}

- (void)webViewDidStartLoad:(UIWebView *)webView {
    [self.loadingIndicator startAnimating] ;
    [self.loadingIndicator setHidden:NO];
}

-(void)webViewDidFinishLoad:(UIWebView *)webView
{
    [self.loadingIndicator setHidden:YES];
    [self.loadingIndicator stopAnimating] ;
}

-(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
     [self.loadingIndicator setHidden:YES];
     [self.loadingIndicator stopAnimating] ;
}

我想你正在寻找这个，否则很抱歉..