0521.使用UIWebView加载来自NetWork、Project、Documents的html、javascript文件

话不多少，直接上代码，思路还是挺简单的。

    UIWebView *webView = [[UIWebView alloc]initWithFrame:self.view.frame];

    // HTML文件来自Project
    // 步骤：path - > url - > request with url - > loadRequest
    NSString *path_Proj = [[NSBundle mainBundle]pathForResource:@"index" ofType:@"html"];
    NSURL *url_Proj = [NSURL fileURLWithPath:path_Proj];
    NSURLRequest *request_local = [NSURLRequest requestWithURL:url_Proj];
    [webView loadRequest:request_local];

    // HTML文件来自Documents
    // 步骤：pathArrary - > path - > url - > request with url - > loadRequest
    NSArray *pathArrary = NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [pathArrary objectAtIndex:0];
    NSString *path_Doc = [documentsDirectory stringByAppendingPathComponent:@"index.html"];
    NSURL *url_Doc = [NSURL fileURLWithPath:path_Doc];
    NSURLRequest *request_Doc = [NSURLRequest requestWithURL:url_Doc];
    [webView loadRequest:request_Doc];

    // HTML文件来自Network
    // 步骤：url - > request with url - > loadRequest
    NSURL *url_net = [NSURL URLWithString:@"http://文件地址/index.html"];
    NSURLRequest *request_net = [NSURLRequest requestWithURL:url_net];
    [webView loadRequest:request_net];

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