為了說明白問題,先看下層級圖 .如下
屏幕快照 2017-07-12 10.25.58.png
- 我在
TwoVC里寫了下面的方法
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
navigationController?.setNavigationBarHidden(true, animated: false)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
navigationController?.setNavigationBarHidden(false, animated: false)
}
但是如果你要是實現(xiàn)了全屏POP,在從
TwoVC-1拖拽到TwoVC界面的時候,navigationBar會出現(xiàn)混亂問題于是我改為下面的方法
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
navigationController?.setNavigationBarHidden(true, animated: true)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
navigationController?.setNavigationBarHidden(false, animated: true)
}
pop的問題解決了,但是當(dāng)我在
OneVC和TwoVC來回切換的時候發(fā)現(xiàn),TwoVC會下移一下,頓時整個人就不好了!!!于是發(fā)現(xiàn)官方文檔解釋(隱藏或顯示導(dǎo)航欄。 如果動畫稀并，它將使用UINavigationControllerHideShowBarDuration進(jìn)行垂直轉(zhuǎn)換。)
Hide or show the navigation bar. If animated, it will transition vertically using UINavigationControllerHideShowBarDuration.
- 最后改為下面的方法
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
navigationController?.setNavigationBarHidden(true, animated: animated)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
navigationController?.setNavigationBarHidden(false, animated: animated)
}
完美解決問題 false -> true -> animated
- 不是很清楚為什么改為true不行,改為animated就可以了,不都是BOOL嗎?
- 如果你知道為啥,還麻煩寫下,告訴更多的人,在此謝謝~~
