Facebook SDK 4.0 iOS 不再快速切换到设备上安装的 Facebook APP

Facebook SDK 4.0 iOS no longer fast switches to the Facebook APP installed on the device

我正在升级到 Facebook SDK 4.6，并且我正在根据 Scruptions 示例应用程序使用以下代码实现新的登录流程：

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FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init];

fromViewController:self
handler:^(FBSDKLoginManagerLoginResult *result, NSError *error) {
if ([result.grantedPermissions containsObject:self.requiredPermission]) {
NSLog (@”Sucess!”);
} else {
[self dismissViewControllerAnimated:YES completion:NULL];
}
}];

在实现此功能后，该应用不再快速转到安装在设备上的 Facebook APP 以请求用户权限，而是在应用内显示一个用户可以登录 Facebook 的网页。

我是否使用了正确的代码？有没有办法让我进入 Facebook APP 并让用户确认那里的权限，就像在 3.x SDK 中一样，因为用户已经登录到 Facebook APP，肯定不会再次登录我的应用程序。

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请检查：-stackoverflow.com/a/32712246/988169
这是因为iOS9。

1	FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init];

尝试从下一个状态设置为 login.loginBehavior：

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typedef NS_ENUM(NSUInteger, FBSDKLoginBehavior)
{
/*!
not installed on the device, falls back to \\c FBSDKLoginBehaviorBrowser. This is the
default behavior.
*/

FBSDKLoginBehaviorNative = 0,

/*!
@abstract Attempts log in through the Safari browser
*/

FBSDKLoginBehaviorBrowser,

/*!
@abstract Attempts log in through the Facebook account currently signed in through
the device Settings.
@note If the account is not available to the app (either not configured by user or
as determined by the SDK) this behavior falls back to \\c FBSDKLoginBehaviorNative.
*/

FBSDKLoginBehaviorSystemAccount,

/*!
@abstract Attemps log in through a modal \\c UIWebView pop up
@note This behavior is only available to certain types of apps. Please check the Facebook
Platform Policy to verify your app meets the restrictions.
*/

FBSDKLoginBehaviorWeb,
};

Facebook SDK 4.0 iOS no longer fast switches to the Facebook APP installed on the device

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