Question

我正在使用UIWebView从文档目录加载一些文件。我已经设置了UIWebView的委托，我正在响应委托的2种方法 webViewDidStartLoad和webViewDidFinishLoad我收到webViewDidStartLoad但我没有收到webViewDidFinishLoad方法。

以下是代码：

@interface MyView: UIViewController <UIWebViewDelegate> {
           UIWebView *webView;
}

@property (nonatomic, retain) UIWebView *webView;

========================= Class ===========================

-(void)viewDidLoad {
    CGRect webFrame = [[UIScreen mainScreen] applicationFrame];
    mWebView = [[UIWebView alloc] initWithFrame:webFrame];
    mWebView.delegate = self;
    mWebView.scalesPageToFit = YES;
    [self.view addSubview:mWebView];
        NSString *path = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@", pathString]];

    [mWebView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:path]] ];
}

// Delegate methods

-(void)webViewDidStartLoad:(UIWebView *)webView {
    NSLog(@"start");    
}   

-(void)webViewDidFinishLoad:(UIWebView *)webView {
    NSLog(@"finish");   
}


-(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
    NSLog(@"Error for WEBVIEW: %@", [error description]);
}

请告诉我出了什么问题。我在didFailLoadWithError委托方法中没有收到任何错误。

注意： - 我正在加载的文件很大，比如3 MB。

谢谢

============= EDITED ==================

当我加载非常庞大的文件时，代表在很长一段时间后才出现，我无法注意到但是对于小文件，一切都工作正常

Answer 1

嘿，你可能应该这样做，

-(void)viewDidLoad {

   //webView alloc and add to view

    CGRect webFrame = [[UIScreen mainScreen] applicationFrame];
    mWebView = [[UIWebView alloc] initWithFrame:webFrame];
    mWebView.delegate = self;
    mWebView.scalesPageToFit = YES;
    [self.view addSubview:mWebView];

    //path of local html file present in documentsDirectory

     NSString *path = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@", pathString]];

    //load file into webView
    [mWebView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:path]] ];

    //show activity indicator
    [self showActivityIndicator]
}

在以下UIWebViewDelegate方法中调用removeLoadingView方法

-(void)webViewDidFinishLoad:(UIWebView *)webView {

  [self removeLoadingView];   
   NSLog(@"finish");   
}


-(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {

    [self removeLoadingView];
    NSLog(@"Error for WEBVIEW: %@", [error description]);
}

showActivityIndicator方法

-(void) showActivityIndicator
{
  //Add a UIView in your .h and give it the same property as you have given to your webView. 
  //Also ensure that you synthesize these properties on top of your implementation file

       loadingView = [UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]]
       loadingView.alpha = 0.5;

 //Create and add a spinner to loadingView in the center and animate it. Then add this loadingView to self.View using

    [self.view addSubView:loadingView];
}

removeLoadingView方法

-(void) removeLoadingView
{
   [loadingView removeFromSuperView];
}

Answer 2

嗯，您的网页视图是否真的完成加载？您也应该实现webView:didFailLoadWithError:以捕获失败。

因为您没有收到失败或成功消息。您尝试加载的数据可能有问题。

尝试告诉webView加载HTML字符串（“Hello World！”），看看是否成功。如果是，那么问题在于您的数据资源或其路径。

Answer 3

WebView代理

下载MBProgessHUD
添加到您的项目
当页面开始加载加载（*）progess启动并在页面加载成功后隐藏

.h文件

    @interface WebViewViewController : UIViewController <MBProgressHUDDelegate,   UIWebViewDelegate>
   {
     MBProgressHUD *HUD;

   }

.m文件

- (void)webViewDidStartLoad:(UIWebView *)webView
{
HUD = [[MBProgressHUD alloc] initWithView:self.navigationController.view];
[self.navigationController.view addSubview:HUD];

HUD.delegate = self;
HUD.labelText = @"Loading";
[HUD show:YES];
}

-(void)webViewDidFinishLoad:(UIWebView *)webView
{
     [HUD hide:YES];
}

Answer 4

可能是出现了错误。实施–webView:didFailLoadWithError:并检查。

Answer 5

确保在视图的.h文件中实现delegate（）并将委托连接到视图。这为我修好了。

Answer 6

.h文件

@property (retain, nonatomic) IBOutlet UIWebView *webview;

.m文件

 -(void)viewDidLoad {
   NSString *urlAddress = @"YOUR_URL";
   _webview.scalesPageToFit = YES;

 //Create a URL object.
   NSURL *url = [NSURL URLWithString:urlAddress];

 //URL Requst Object
   NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];

 //Load the request in the UIWebView.
   [_webview loadRequest:requestObj];
}
- (void)webViewDidStartLoad:(UIWebView *)webView;
{
    [self.indicater_web startAnimating];
}
//a web view starts loading
- (void)webViewDidFinishLoad:(UIWebView *)webView;
{
    [self.indicater_web stopAnimating];
}
//web view finishes loading
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error;
{
    [self.indicater_web stopAnimating];
}
- (BOOL)webView:(UIWebView *)wv shouldStartLoadWithRequest:(NSURLRequest *)rq
{
    [self.indicater_web startAnimating];
    return YES;
}

UIWebView webViewDidFinishLoad没有被称为iOS

6 个答案: