iOS自定义后退按钮过渡不良

Question

我想在 viewController 中自定义后退按钮的图像。所以对于这个 viewController 我有:

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    navigationController?.navigationBar.backIndicatorImage = #customImage
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    navigationController?.navigationBar.backIndicatorImage = #restoreImage
}

但是当我显示前一个 viewController(调用 viewWillDissapear)时，这个前一个 viewController 等到它显示以设置图像(如果我滑动这不会发生):

Answer 1

此处，图像 (imageSize 40 * 40) 的更改工作正常。你可以试试这个。

第二 View Controller :

override func viewWillAppear(_ animated: Bool) {
    var backButtonImage = UIImage(named: "lineBack.png")
    UIBarButtonItem.appearance().setBackButtonBackgroundImage(backButtonImage, for: .normal, barMetrics: .default)
}

第三 View Controller :

override func viewWillAppear(_ animated: Bool) {
    var backButtonImage = UIImage(named: "roundBack.png")
    UIBarButtonItem.appearance().setBackButtonBackgroundImage(backButtonImage, for: .normal, barMetrics: .default)
}