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[已解决]swift中点回返回前页时导航栏背景色是黑色

Swift crifan 1142浏览 0评论

进入下一页:

点击返回,结果可以看到一闪而过的导航栏的背景色是黑色:

但是其实此处已经设置了,全局的导航栏的背景色了:

willFinishLaunchingWithOptions
        //set navi bar image color
        UINavigationBar.appearance().tintColor = ColorNavigationBarImageAndText
        //set navi bar background color
        UINavigationBar.appearance().barTintColor = ColorMainApp
        //UINavigationBar.appearance().barTintColor = UIColor.redColor()
        //set navi bar not translucent -> makesure background color precise/correct
        UINavigationBar.appearance().translucent = false
        //set navi bar text color and font
        UINavigationBar.appearance().titleTextAttributes = [
            NSFontAttributeName: FontNavigationBarText,
            NSForegroundColorAttributeName : ColorNavigationBarImageAndText]

并且:

前一页和下一页,都已经设置了背景色了:

        self.view.backgroundColor = UIColor.whiteColor()
        self.view.backgroundColor = ColorMainTabBackground

不过其中特殊的是:

对于登陆页面,由于页面需求,显示时,是把导航栏隐藏掉的:

    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        SingletonLoginNVC().navigationBarHidden = true
    }
   
    override func viewWillDisappear(animated: Bool) {
        super.viewWillDisappear(animated)
       
        SingletonLoginNVC().navigationBarHidden = false
    }

ios navigation bar background black

uinavigationcontroller – Change color of translucent black UINavigationBar – Stack Overflow

iphone – set tint colors for uinavigation bar in iOS 7 with out inturupting barbutton items – Stack Overflow

colors – IOS7 UINavigationBar black background – Stack Overflow

ios7 – How to change Navigation Bar color in iOS 7? – Stack Overflow

改为:

//        UINavigationBar.appearance().barTintColor = ColorMainApp
        UINavigationBar.appearance().barTintColor = UIColor.redColor()

虽然导航栏背景色变成红色了,但是返回上一页,切换时候的背景色,还是黑色。。

ios navigation back animation background color black

ios navigation  background color black when animation

objective c – iOS 7 shows black background in custom animation for Navigation – Stack Overflow

改为:

    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(false)
        SingletonLoginNVC().navigationBarHidden = true
    }
   
    override func viewWillDisappear(animated: Bool) {
        super.viewWillDisappear(false)
       
        SingletonLoginNVC().navigationBarHidden = false
    }

问题依旧。。。

考虑到:可能是由于,导航栏消失的太早了:在viewWillAppear和viewWillDisappear,所以导致:

后一页返回到前一页时,前一页还没有完全出现,导航栏就消失了,导致顶部出现空的黑色

所以改为:viewDidAppear去试试:

    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
       
        SingletonLoginNVC().navigationBarHidden = true
    }
   
//    override func viewWillAppear(animated: Bool) {
//        super.viewWillAppear(animated)
////        super.viewWillAppear(false)
//
//        SingletonLoginNVC().navigationBarHidden = true
//    }
   
    override func viewWillDisappear(animated: Bool) {
        super.viewWillDisappear(animated)
//        super.viewWillDisappear(false)
       
        SingletonLoginNVC().navigationBarHidden = false
    }

果然可以了:

最后试了各种可能:

LoginViewController
    overridefunc viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
//        super.viewDidAppear(false)
       
        SingletonLoginNVC().navigationBarHidden = true
    }
   
//    override func viewWillAppear(animated: Bool) {
//        super.viewWillAppear(animated)
////        super.viewWillAppear(false)
//
//        SingletonLoginNVC().navigationBarHidden = true
////        SingletonLoginNVC().navigationBar.backgroundColor = UIColor.whiteColor()
////        SingletonLoginNVC().navigationBar.barTintColor = UIColor.whiteColor()
//    }
   
    override func viewWillDisappear(animated: Bool) {
        super.viewWillDisappear(animated)
//        super.viewWillDisappear(false)
       
        SingletonLoginNVC().navigationBarHidden = false
//        SingletonLoginNVC().navigationBar.backgroundColor = ColorAppBackground
//        SingletonLoginNVC().navigationBar.barTintColor = ColorMainApp
  }
   
//    override func viewDidDisappear(animated: Bool) {
//        super.viewDidAppear(animated)
//       
//        SingletonLoginNVC().navigationBarHidden = false
//    }
   
    override func viewDidLoad() {
        super.viewDidLoad()
       
        SingletonLoginNVC().navigationBarHidden = true
RegisterPhoneViewController
//    override func viewWillAppear(animated: Bool) {
//        super.viewWillAppear(animated)
//        //        super.viewWillAppear(false)
//       
//        SingletonLoginNVC().navigationBarHidden = false
//        //        SingletonLoginNVC().navigationBar.backgroundColor = UIColor.whiteColor()
//        //        SingletonLoginNVC().navigationBar.barTintColor = UIColor.whiteColor()
//    }
//     override func viewWillDisappear(animated: Bool) {
//         super.viewWillDisappear(animated)
// //        super.viewWillDisappear(false)
//
//         SingletonLoginNVC().navigationBarHidden = true
// //        SingletonLoginNVC().navigationBar.backgroundColor = ColorAppBackground
////         SingletonLoginNVC().navigationBar.barTintColor = ColorMainApp
//   }
   
//     override func viewDidAppear(animated: Bool) {
//         super.viewDidAppear(animated)
// //        super.viewDidAppear(false)
//
//         SingletonLoginNVC().navigationBarHidden = false
//     }

最终是:

只需要操作单个页面LoginViewController,即可:

1.第一次初始化的时候,比如viewDidLoad中,隐藏导航栏:

    override func viewDidLoad() {
        super.viewDidLoad()
       
        SingletonLoginNVC().navigationBarHidden = true

-》这样就可以避免,如果只在viewDidAppear中设置隐藏导航栏,而使得显示时候

整个登陆页面显示完毕后,再去动画隐藏掉导航栏

-》注册页面只需要注册一次,很少用,而登陆页面很常用,如果每次启动都有这个隐藏东航了的动画,用户肯定不爽

2.然后再去,已经显示viewDidAppear时,再次隐藏导航栏:

    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
       
        SingletonLoginNVC().navigationBarHidden = true
    }

-》使得每次从下一页返回时,等到整页都显示完全后,再去隐藏导航栏

-》用户极少才会出现,注册页面期间,没有继续注册,却返回登陆页面的

-》此时的隐藏导航栏的动画,即使不爽,也无大碍,极少极少的用户才会遇到

3.然后将要消失,将要切换到别的页面时,再去显示导航栏:

    override func viewWillDisappear(animated: Bool) {
        super.viewWillDisappear(animated)
       
        SingletonLoginNVC().navigationBarHidden = false
  }

整个效果是:

登陆时,没有隐藏导航栏的动画了:

切换到下一页,直接显示出导航栏:

然后再返回前一页时,先画面切换:

切换完毕,顶部到导航栏:

再消失:

如此,两个页面的切换,才显得很正常,不诡异。

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