UIWebView加载Loading...两种方法

第一种方法：使用UIView and UIActivityIndicatorView

C代码  

1. //创建UIWebView   
2. WebView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 44, 320, 400)];   
3. [WebView setUserInteractionEnabled:NO];   
4. [WebView setBackgroundColor:[UIColor clearColor]];   
5. [WebView setDelegate:self];   
6. [WebView setOpaque:NO];//使网页透明   
7.     
8. NSString *path = @"http://www.baidu.com";   
9. NSURL *url = [NSURL URLWithString:path];   
10. [WebView loadRequest:[NSURLRequest requestWithURL:url]];   
11.         
12. //创建UIActivityIndicatorView背底半透明View      
13. UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];   
14. [view setTag:103];   
15. [view setBackgroundColor:[UIColor blackColor]];   
16. [view setAlpha:0.8];   
17. [self.view addSubview:view];   
18.     
19. activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 32.0f, 32.0f)];   
20. [activityIndicator setCenter:view.center];   
21. [activityIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhite];   
22. [view addSubview:activityIndicator];   
23. [self.view addSubview:WebView];   
24. [view release];   
25. [WebView release];   
26.     
27. //开始加载数据   
28. - (void)webViewDidStartLoad:(UIWebView *)webView {      
29.       [activityIndicator startAnimating];           
30. }   
31.     
32. //数据加载完   
33. - (void)webViewDidFinishLoad:(UIWebView *)webView {   
34.      [activityIndicator stopAnimating];      
35.      UIView *view = (UIView *)[self.view viewWithTag:103];   
36.      [view removeFromSuperview];   
37. }  

//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];
[view release];
[WebView release];
 
//开始加载数据
- (void)webViewDidStartLoad:(UIWebView *)webView {   
      [activityIndicator startAnimating];        
}
 
//数据加载完
- (void)webViewDidFinishLoad:(UIWebView *)webView {
     [activityIndicator stopAnimating];   
     UIView *view = (UIView *)[self.view viewWithTag:103];
     [view removeFromSuperview];
}

 

第二种方法：使用UIAlertView and UIActivityIndicatorView

C代码  

1. //加载网页动画   
2. - (void)webViewDidStartLoad:(UIWebView *)webView{   
3.     if (myAlert==nil){          
4.        myAlert = [[UIAlertView alloc] initWithTitle:nil   
5.                                                               message: @"正在讀取網路資料"  
6.                                                                 delegate: self   
7.                                                  cancelButtonTitle: nil   
8.                                                  otherButtonTitles: nil];   
9.         
10.      UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];   
11.      activityView.frame = CGRectMake(120.f, 48.0f, 37.0f, 37.0f);   
12.      [myAlert addSubview:activityView];   
13.      [activityView startAnimating];   
14.      [myAlert show];   
15.      }   
16. }   
17.     
18. - (void)webViewDidFinishLoad:(UIWebView *)webView{   
19.       [myAlert dismissWithClickedButtonIndex:0 animated:YES];   
20. }  

//加载网页动画
- (void)webViewDidStartLoad:(UIWebView *)webView{
    if (myAlert==nil){       
       myAlert = [[UIAlertView alloc] initWithTitle:nil
                                                              message: @"正在讀取網路資料"
                                                                delegate: self
                                                 cancelButtonTitle: nil
                                                 otherButtonTitles: nil];
     
     UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
     activityView.frame = CGRectMake(120.f, 48.0f, 37.0f, 37.0f);
     [myAlert addSubview:activityView];
     [activityView startAnimating];
     [myAlert show];
     }
}
 
- (void)webViewDidFinishLoad:(UIWebView *)webView{
      [myAlert dismissWithClickedButtonIndex:0 animated:YES];
}

 

来源： http://www.cocoachina.com/bbs/read.php?tid=9419

 

用法一：只显示不停旋转的进度滚轮指示器。

C代码  

1. //显示进度滚轮指示器   
2. -(void)showWaiting {   
3.     progressInd=[[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle: UIActivityIndicatorViewStyleWhiteLarge];   
4.     progressInd.center=CGPointMake(self.view.center.x,240);   
5.     [self.navigationController.view addSubview:progressInd];   
6.     [progressInd startAnimating];   
7. }   
8.   
9. //消除滚动轮指示器   
10. -(void)hideWaiting   
11. {   
12.     [progressInd stopAnimating];   
13. }  

//显示进度滚轮指示器
-(void)showWaiting {
    progressInd=[[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle: UIActivityIndicatorViewStyleWhiteLarge];
    progressInd.center=CGPointMake(self.view.center.x,240);
    [self.navigationController.view addSubview:progressInd];
    [progressInd startAnimating];
}

//消除滚动轮指示器
-(void)hideWaiting
{
    [progressInd stopAnimating];
}

 

用法二：带有半透明背景的进度轮指示器。

C代码  

1. //显示进度滚轮指示器   
2. -(void)showWaiting:(UIView *)parent   
3. {   
4.     int width = 32, height = 32;   
5.     CGRect frame = CGRectMake(100, 200, 110, 70) ;//[parent frame]; //[[UIScreen mainScreen] applicationFrame];   
6.     int x = frame.size.width;   
7.     int y = frame.size.height;   
8.      
9.     frame = CGRectMake((x - width) / 2, (y - height) / 2, width, height);   
10.     UIActivityIndicatorView* progressInd = [[UIActivityIndicatorView alloc]initWithFrame:frame];   
11.     [progressInd startAnimating];   
12.     progressInd.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;   
13.   
14.     frame = CGRectMake((x - 70)/2, (y - height) / 2 + height, 80, 20);   
15.     UILabel *waitingLable = [[UILabel alloc] initWithFrame:frame];   
16.     waitingLable.text = @"Loading...";   
17.     waitingLable.textColor = [UIColor whiteColor];   
18.     waitingLable.font = [UIFont systemFontOfSize:15];   
19.     waitingLable.backgroundColor = [UIColor clearColor];   
20.   
21.     frame =  CGRectMake(100, 200, 110, 70) ;//[parent frame];   
22.     UIView *theView = [[UIView alloc] initWithFrame:frame];   
23.     theView.backgroundColor = [UIColor blackColor];   
24.     theView.alpha = 0.7;   
25.   
26.     [theView addSubview:progressInd];   
27.     [theView addSubview:waitingLable];   
28.   
29.     [progressInd release];   
30.     [waitingLable release];   
31.   
32.     [theView setTag:9999];   
33.     [parent addSubview:theView];   
34.     [theView release];   
35.   
36. }   
37.   
38.   
39. //消除滚动轮指示器   
40. -(void)hideWaiting   
41.   
42. {   
43.     [[self.view viewWithTag:9999] removeFromSuperview];   
44.   
45. }  

//显示进度滚轮指示器
-(void)showWaiting:(UIView *)parent
{
    int width = 32, height = 32;
    CGRect frame = CGRectMake(100, 200, 110, 70) ;//[parent frame]; //[[UIScreen mainScreen] applicationFrame];
    int x = frame.size.width;
    int y = frame.size.height;
  
    frame = CGRectMake((x - width) / 2, (y - height) / 2, width, height);
    UIActivityIndicatorView* progressInd = [[UIActivityIndicatorView alloc]initWithFrame:frame];
    [progressInd startAnimating];
    progressInd.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;

    frame = CGRectMake((x - 70)/2, (y - height) / 2 + height, 80, 20);
    UILabel *waitingLable = [[UILabel alloc] initWithFrame:frame];
    waitingLable.text = @"Loading...";
    waitingLable.textColor = [UIColor whiteColor];
    waitingLable.font = [UIFont systemFontOfSize:15];
    waitingLable.backgroundColor = [UIColor clearColor];

    frame =  CGRectMake(100, 200, 110, 70) ;//[parent frame];
    UIView *theView = [[UIView alloc] initWithFrame:frame];
    theView.backgroundColor = [UIColor blackColor];
    theView.alpha = 0.7;

    [theView addSubview:progressInd];
    [theView addSubview:waitingLable];

    [progressInd release];
    [waitingLable release];

    [theView setTag:9999];
    [parent addSubview:theView];
    [theView release];

}


//消除滚动轮指示器
-(void)hideWaiting

{
    [[self.view viewWithTag:9999] removeFromSuperview];

}

 

来源： http://blog.youkuaiyun.com/lovenjoe/article/details/7498238