iphone 等待进度条

方法3：

   UIActivityIndicatorView *activity = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0, 0, 30, 30)];//指定进度轮的大小
    [activity setCenter:CGPointMake(160, 140)];//指定进度轮中心点
    [activity setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhiteLarge];//设置进度轮显示类型
    [self.view addSubview:activity];
    [super viewDidLoad];
    [activity startAnimating];
   // [activity stopAnimating];


方法1：

//success 滚动条
-(void)waitequan{
    //创建UIWebView
    UIWebView *WebView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 44, 320, 400)];
    [WebView setUserInteractionEnabled:NO];
    [WebView setBackgroundColor:[UIColor clearColor]];
    [WebView setDelegate:self];
    [WebView setOpaque:NO];//使网页透明
   
    NSString *path = @"http://www.baidu.com";
    NSURL *url = [NSURL URLWithString:path];
    [WebView loadRequest:[NSURLRequest requestWithURL:url]];
   
    //创建UIActivityIndicatorView背底半透明View
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
    [view setTag:103];
    [view setBackgroundColor:[UIColor blackColor]];
    [view setAlpha:0.8];
    [self.view addSubview:view];
   
    activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 32.0f, 32.0f)];
    [activityIndicator setCenter:view.center];
    [activityIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhite];
    [view addSubview:activityIndicator];
    [self.view addSubview:WebView];
    [view release];
    [WebView release];

}

//开始加载数据
- (void)webViewDidStartLoad:(UIWebView *)webView {
    NSLog(@"begin");
    [activityIndicator startAnimating];
}

//数据加载完
- (void)webViewDidFinishLoad:(UIWebView *)webView {
     NSLog(@"end");
    [activityIndicator stopAnimating];
    UIView *view = (UIView *)[self.view viewWithTag:103];
    [view removeFromSuperview];
}


方法2：


- (void)showProgressAlert{
    UIAlertView* alertView = [[[UIAlertView alloc] initWithTitle:@"title"
                                                         message:@"hello"
                                                        delegate:nil
                                               cancelButtonTitle:nil
                                               otherButtonTitles:nil]
                              autorelease];
   
    progressView_ = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleBar];
    progressView_.frame = CGRectMake(30, 80, 225, 30);
    [alertView addSubview:progressView_];
   
    [alertView show];
}
- (void)updateProgress:(NSNumber*)progress {
    progressView_.progress = [progress floatValue];
}
- (void)dismissProgressAlert {
    if (progressView_ == nil) {
        return;
    }
   
    if ([progressView_.superview isKindOfClass:[UIAlertView class]]) {
        UIAlertView* alertView = (UIAlertView*)progressView_.superview;
        [alertView dismissWithClickedButtonIndex:0 animated:NO];
    }
   
    [progressView_ release];
    progressView_ = nil;
}

- (void)processData:(int)total {
    for (int i = 0; i < total; ++i) {
        // Update UI to show progess.
        float progress = (float)i / total;
        NSNumber* progressNumber = [NSNumber numberWithFloat:progress];
        [self performSelectorOnMainThread:@selector(updateProgress:)
                               withObject:progressNumber
                            waitUntilDone:NO];
       
        // Process.
        // do it.
    }
   
    // Finished.
    [self performSelectorOnMainThread:@selector(dismissProgressAlert)
                           withObject:nil
                        waitUntilDone:YES];
    // Other finalizations.
}