iOS webview 点击按钮返回上一页面或者返回首页

- (void)floatBtn:(UIButton *)sender {
    NSLog(@"点击");
    if ([self.webView canGoBack]) {
        [self.webView goBack];
        
    }

    else{
        [self.view resignFirstResponder];
        [self.navigationController popViewControllerAnimated:YES];
    }
   
}