我的 facebook 应用程序上的登录按钮在 iOS 8 中完全停止工作。我以为这是我所做的事情，但是当我从他们的网站获取 facebook 示例 html 并将其应用到我的页面时，它仍然不起作用（我的应用程序 ID 已被替换）与 xxxxx）。基本上，弹出窗口会打开进行 Facebook 身份验证，但永远不会关闭并返回到我的应用程序。我只是留下一个空白，打开哪个选项卡：
<!DOCTYPE html>
<html>
<head>
<title>Facebook Login JavaScript Example</title>
<meta charset="UTF-8">
</head>
<body>
<script>
// This is called with the results from from FB.getLoginStatus().
function statusChangeCallback(response) {
console.log('statusChangeCallback');
console.log(response);
// The response object is returned with a status field that lets the
// app know the current login status of the person.
// Full docs on the response object can be found in the documentation
// for FB.getLoginStatus().
if (response.status === 'connected') {
// Logged into your app and Facebook.
testAPI();
} else if (response.status === 'not_authorized') {
// The person is logged into Facebook, but not your app.
document.getElementById('status').innerHTML = 'Please log ' +
'into this app.';
} else {
// The person is not logged into Facebook, so we're not sure if
// they are logged into this app or not.
document.getElementById('status').innerHTML = 'Please log ' +
'into Facebook.';
}
}
// This function is called when someone finishes with the Login
// Button. See the onlogin handler attached to it in the sample
// code below.
function checkLoginState() {
FB.getLoginStatus(function (response) {
statusChangeCallback(response);
});
}
window.fbAsyncInit = function () {
FB.init({
appId: 'xxxxxxxxxxxxx',
cookie: true, // enable cookies to allow the server to access
// the session
xfbml: true, // parse social plugins on this page
version: 'v2.1' // use version 2.1
});
// Now that we've initialized the JavaScript SDK, we call
// FB.getLoginStatus(). This function gets the state of the
// person visiting this page and can return one of three states to
// the callback you provide. They can be:
//
// 1. Logged into your app ('connected')
// 2. Logged into Facebook, but not your app ('not_authorized')
// 3. Not logged into Facebook and can't tell if they are logged into
// your app or not.
//
// These three cases are handled in the callback function.
FB.getLoginStatus(function (response) {
statusChangeCallback(response);
});
};
// Load the SDK asynchronously
(function (d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_US/sdk.js";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));
// Here we run a very simple test of the Graph API after login is
// successful. See statusChangeCallback() for when this call is made.
function testAPI() {
console.log('Welcome! Fetching your information.... ');
FB.api('/me', function (response) {
console.log('Successful login for: ' + response.name);
document.getElementById('status').innerHTML =
'Thanks for logging in, ' + response.name + '!';
});
}
</script>
<!--
Below we include the Login Button social plugin. This button uses
the JavaScript SDK to present a graphical Login button that triggers
the FB.login() function when clicked.
-->
<fb:login-button scope="public_profile,email" onlogin="checkLoginState();">
</fb:login-button>
<div id="status">
</div>
</body>
</html>
我想到的唯一解决方案是在 iOS 上使用完全重定向时降级回服务器端身份验证流程。基本上你的应用程序应该点击这样的 URL：
https://www.facebook.com/dialog/oauth?
client_id={app-id}
&redirect_uri={redirect-uri}
这在桌面上是一种不和谐的体验，但在移动设备上可以说是一种更好的体验，因为用户不会经历奇怪的选项卡切换（这首先是新问题的根源）。要仅在 iOS 上降级到此流程，请确保您的登录链接实际上是 Facebook 身份验证对话框的 href（如上面的链接，或者对于 Rails 上的omniauth 用户来说，是“/auth/facebook”）。然后将调用客户端流程的 JavaScript 封装在代码中，以防止其在 iOS（或所有移动设备，如果您愿意）上运行。
if(!/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent)) {
[Facebook client side flow code here]
}
（如果有人有更优雅的方法，请在评论中告诉我）
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