显示进度条，直到它在 UIWebView IOS7 中加载数据

问题描述

在我的应用程序中，我有 UIWebView，它使用 URL 加载 pdf 文件，它非常大的文件需要花费太多时间来加载.现在我想向用户展示喜欢它的加载进度，直到它加载我的pdf，一旦我的文件加载它隐藏了进度条，我该如何实现?

Hi in my application i have UIWebView which loads the pdf file using URL its very large file its taking too much time to load. Now i want show the user that like its loading progress until it get load the my pdf once my file loaded its has hide the progress bar, how can I achieve this?

我的 webview 代码.

My webview code.

- (void)viewDidLoad
{
   [super viewDidLoad];

   NSString *pdf =@"http://jesusredeems.com/mag/pdf/JRE-2014-03.pdf";

   NSURL *url = [NSURL URLWithString:pdf];

   NSURLRequest *myRequest = [NSURLRequest requestWithURL:url];
   [webview loadRequest:myRequest];

}

我正在使用上面的代码来加载我的pdf，如何使用进度条来加载文件?

I'm using the above code to load my pdf, how I can use the progress bar for file loading?

推荐答案

你应该在 webview 委托方法中启动/停止进度条.

You should start/stop the progressbar in webview delegate methods.

在您的 viewDidLoad 中添加以下行.

Add following line in your viewDidLoad.

webview.delegate = self;

在您的控制器中添加以下功能...

Add following functions in your controller...

-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
    //Start the progressbar.. 
    return YES;
}

-(void)webViewDidFinishLoad:(UIWebView *)webView
{
    //Stop or remove progressbar
}

-(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
    //Stop or remove progressbar and show error
}

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