UIWebView HTML输入按钮无法点击

Question

我的应用程序连接到Instagram，所以我需要一个webview来呈现Instagram登录HTML页面。 UIWebView中显示的用于uname和pass的输入字段是可选择的并接受输入。登录按钮无法点击。来自UIWebView的相关.m文件代码和HTML如下所示。

的.m

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    self.webView.delegate = self;
    self.usernameField.delegate = self;
    self.passwordField.delegate = self;
    self.webView.scalesPageToFit = YES;
    self.request = [[NSURLRequest alloc]initWithURL:self.url];

    [_webView loadRequest:self.request];
    NSLog(@"NSURL on webview %@", self.request);

}

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
    NSLog(@"%@",
          [_webView stringByEvaluatingJavaScriptFromString:
           @"document.body.innerHTML"]);
    _webView.opaque = YES;
}




<p><label for="id_password">Password:</label> <input autocapitalize="off" autocorrect="off" type="password" name="password" id="id_password"></p>
                <p class="form-actions">
                    <a href="/accounts/password/reset/">Forgot password?</a>
                    <input type="submit" class="button-green" value="Log in">
                </p>
            </form>
        </div>

    </div>
</section>

<script>
    $(window).load(
        function() {
            $("#id_username").focus();
        }
    );
</script>

<div id="reactModalMountPoint"></div>
</div>