UIWebView webViewDidFinishLoad 没有被调用 iOS

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 2 种委托方法，即 webViewDidStartLoad 和 webViewDidFinishLoad 我收到了 webViewDidStartLoad 但我没有收到 webViewDidFinishLoad 方法。

下面是代码：

@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]);
}

请让我知道出了什么问题。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

=============已编辑===================

当我加载非常大的文件时，代理在很长一段时间后才出现，我没有注意到，但对于小文件，一切正常

Answer 1

嘿，也许你应该这样做，

-(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]);
}

showActivityIndi​​cator 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

好吧，你的 webview 真的完成加载了吗？你也应该实现webView:didFailLoadWithError: 来捕获失败。

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 加载一个 HTML 字符串（“Hello World！”），看看是否成功。如果是这样，那么问题出在您的数据资源或其路径上。

Answer 3

WebView 委托

1. 下载 MBProgessHUD
2. 添加到您的项目中
3. 当页面开始加载加载 (*) 进程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

可能它遇到了错误。执行–webView:didFailLoadWithError: 并检查。

Answer 5

确保在视图的 .h 文件中实现委托 ( ) 并将委托连接到视图。这为我解决了问题。

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;
}