uiwebview 未加載 web 頁面

Question

in my program uiwebview is not loading the url address.when i nslogged the request object is not null.however when i nslog the webview.request it returns null.what may be the reason it is not loading

 - (void)viewDidLoad {
        [super viewDidLoad];

        self.web = [[UIWebView alloc] init];
        NSString *urlAddress = @"http://www.google.com";
        NSURL *url = [NSURL URLWithString:urlAddress];
        NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];

        NSLog(@"%@",requestObj);
        [self.web loadRequest:requestObj];
        [web setFrame:CGRectMake(0, 0, 320, 370)];
        NSLog(@"%@   %@",self.web,self.web.request);


    }

nslog 結果是

<NSURLRequest http://www.google.com>
 <UIWebView: 0xbb17ff0; frame = (0 0; 320 370); layer = <CALayer: 0xbb12f20>>   (null)

根據該站點的建議，我將其從 IB 更改為代碼。我將 class 確認為 uiwebview 代表。webviewdidstart 和 Z5A98E2840FD0141780D854E48C608D4

webviewdstart

webView-----><NSMutableURLRequest >
webView-----><NSMutableURLRequest http://www.google.com>

webview 完成了

webView-finished----><NSMutableURLRequest http://www.google.com>
webView-finished----><NSMutableURLRequest http://www.google.com>

仍然沒有被調用，我認為這兩種方法都被調用了兩次

Answer 1

這是一個工作代碼，在您的應用程序中測試它並讓我們知道結果

在.h文件中，添加UIWebViewDelegate

in.m 文件的viewDidLoad ，添加：

UIWebView *webview=[[UIWebView alloc] initWithFrame:CGRectMake(0.0,0.0,320.0,460.0)];
NSURL *url = [NSURL URLWithString:@"http://www.google.com"];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
webview.delegate = self;
[webview loadRequest:requestObj];
[self.view addSubview:webview];

如果您的頁面正在加載，現在檢查代表：

- (void)webViewDidStartLoad:(UIWebView *)webView {     
   NSLog(@"page is loading");       
 }

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

Answer 2

像這樣嘗試

 CGRect webFrame = CGRectMake(0.0, 0.0, 320.0, 460.0);
UIWebView *webView = [[UIWebView alloc] initWithFrame:webFrame];

NSString *urlAddress = @"http://www.google.com";
NSURL *url = [NSURL URLWithString:urlAddress];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url]; 
 [webView loadRequest:requestObj]; 
[self addSubview:webView]; 
[webView release];