iOS Google SignIn视图缺少导航栏和底栏

Question

@interface GooglePlusManager() <GIDSignInDelegate,GIDSignInUIDelegate>

@property (nonatomic, strong) GIDSignIn *gppSignIn;
@property (nonatomic, weak) UIViewController * localVC;
@end

@implementation TWNGooglePlusManager

(void)doGooglePlusLogin: (UIViewController *)viewController
{
    [self setPropertiesToInitialState];

NSString* clientId = [[[NSBundle mainBundle] infoDictionary] valueForKey:@"GoogleClientId"];
self.gppSignIn = [GIDSignIn sharedInstance];

[self.gppSignIn setClientID:clientId];

if (self.gppSignIn)
{
    self.gppSignIn.scopes =  @[ @"profile", @"email" ];

    [self.gppSignIn setDelegate:self];
    self.localVC = viewController;
    [self.gppSignIn setUiDelegate:self];
    self.gppSignIn.allowsSignInWithWebView = YES;
    [self.gppSignIn signIn];

}
}

#pragma mark - GIDSignInUiDelegate
 (void)signIn:(GIDSignIn *)signIn presentViewController:(UIViewController     *)viewController {

[self.localVC presentViewController:viewController animated:YES completion:nil];

}
@end

基本上，GIDSignIn在我的GooglePlusManager中，我将当前的SignIN ViewController传递给GooglePlusManager，一切正常，但登录页面没有后退/取消按钮。我试过setUiDelegate到self或VC，结果是一样的。 发生在真正的9.0设备和9.1模拟器中。

Answer 1

找出答案是我错过了SafariServices.framework。在我将SafariServices.framework链接到应用程序后，它正常工作。