UIWebView 前进 后退 刷新 取消

- (IBAction)backButtonPush {
    if (self.webView.canGoBack)
    {
        [self.webView goBack];
    }
}
- (IBAction)forwardButtonPush {
    if (self.webView.canGoForward)
        
    {
        [self.webView goForward];
    }
}
- (IBAction)reloadButtonPush {
    
    [self.webView reload];
}

- (IBAction)stopButtonPush {
    
    if (self.webView.loading)
    {
        [self.webView stopLoading];
    }

}