IOS开发之等待页面，结合UIWebView、UIAlertView、UIActivityIndicatorView

1、定义

@property (strong, nonatomic) UIWebView *WebView;

@property (strong, nonatomic) UIActivityIndicatorView *activityIndicator;



@property (strong, nonatomic) UIAlertView *myAlert;

2、UIWebView结合UIActivityIndicatorView实现

//创建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];

-(void)webViewDidStartLoad:(UIWebView *)webView
{
   [_activityIndicator startAnimating];
}

-(void)webViewDidFinishLoad:(UIWebView *)webView
{
    [_activityIndicator stopAnimating];
    UIView *view = (UIView *)[self.view viewWithTag:103];
    [view removeFromSuperview];
}

3、UIAlertView结合UIActivityIndicatorView实现

-(void)webViewDidStartLoad:(UIWebView *)webView
{
    //[_activityIndicator startAnimating];
    
    if (_myAlert==nil){
        _myAlert = [[UIAlertView alloc] initWithTitle:nil
                                             message: @"读取中..."
                                            delegate: self
                                   cancelButtonTitle: nil
                                   otherButtonTitles: nil];
        
        _activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
        _activityIndicator.frame = CGRectMake(120.f, 48.0f, 38.0f, 38.0f);
        [_myAlert addSubview:_activityIndicator];
        [_activityIndicator startAnimating];
        [_myAlert show];
    }
}

-(void)webViewDidFinishLoad:(UIWebView *)webView
{
     [_myAlert dismissWithClickedButtonIndex:0 animated:YES];
}