ios - swift 3 : How to set up UINavigationBar setBackgroundImage in AppDelegate

Question

我最近从 Swift 2 迁移到 Swift 3，我被困在一个部分。在我的 AppDelegate 中，我设置了 UINavigationBar 的默认设置，如下所示。我面临的挑战是 setBackgroundImage 在 Swift 3 中不再被识别，我找不到替代方案。

有没有人遇到同样的问题并且能够解决它？

    let turquoiseBackgroundImage:UIImage = UIImage(named: "navigationBarTurqoise")!


    **// TODO Below is not working with Swift 3
    UINavigationBar.appearance().setBackgroundImage(turquoiseBackgroundImage, forBarPosition: .Default)**


    // Set up Back button to be white in Navigation bar
    UINavigationBar.appearance().barStyle = UIBarStyle.default
    UINavigationBar.appearance().tintColor = UIColor.white

    // Font Name and Size of Title in Navigation Bar
    if let font = UIFont(name: "TitilliumWeb-Light", size: 20) {
        UINavigationBar.appearance().titleTextAttributes = [NSFontAttributeName : font, NSForegroundColorAttributeName : UIColor.white]
    }

    // Remove hairline between navigation bar and anything below such as search bar
    UINavigationBar.appearance().shadowImage = UIImage()

    // Set up status bar (battery, time, etc.) to white
    UIApplication.shared.statusBarStyle = .lightContent

Answer 1

UINavigationBar.appearance().setBackgroundImage(turquoiseBackgroundImage, forBarPosition: .Default)

像这样重写代码

UINavigationBar.appearance().setBackgroundImage(turquoiseBackgroundImage, for: .default)