- (void)viewDidLoad {

    [superviewDidLoad];

//重新給interactivePopGestureRecognizer.delegate掛代理

self.navigationController.interactivePopGestureRecognizer.delegate = (id)self;

self.navigationController.interactivePopGestureRecognizer.enabled = YES;

// 設定導航預設標題的顏色及字型大小

if ([[UIDevicecurrentDevice].

self.navigationController.navigationBar.titleTextAttributes = @{NSForegroundColorAttributeName: [UIColorwhiteColor],NSFontAttributeName : [UIFontboldSystemFontOfSize:17]};

    }

}