ios - 如何使 UIImage 适合整个 UINavigationBar View 的大小

Question

我需要为整个应用的UINavigationController栏设置背景图片，所以写了如下代码:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject : AnyObject]?) -> Bool {

    let backgroundImage = UIImage(named: "NavBar")
    UINavigationBar.appearance().setBackgroundImage(backgroundImage, forBarMetrics: .Default)

    return true
}

但是我需要使 UIImage 适合条形的大小，因为在我的例子中它太大并且不适合整个条形。我该怎么做？

提前致谢。

Answer 1

它应该自动重复以填充导航栏的大小，但如果你想让它拉伸(stretch)，你可以在 Assets 目录中更改设置切片插入:

https://developer.apple.com/library/ios/recipes/xcode_help-image_catalog-1.0/chapters/SlicinganImage.html

或者像这样的代码:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

    let backgroundImage = UIImage(named: "NavBar")?.resizableImageWithCapInsets(UIEdgeInsetsMake(0, 15, 0, 15), resizingMode: UIImageResizingMode.Stretch)

    UINavigationBar.appearance().setBackgroundImage(backgroundImage, forBarMetrics: .Default)

    return true
}