webView进度条

self.progress = [[NJKWebViewProgress alloc] init];

self.webView.delegate = self.progress;

__weak typeof(self) weakSelf = self;

self.progress.progressBlock = ^(float progress) {

weakSelf.progressView.progress = progress;

weakSelf.progressView.hidden = (progress == 1.0);

};

self.progress.webViewProxyDelegate = self;