Question

我正致力于构建我正在构建的应用程序。我想将一些系统范围的样式（字体）应用于选项卡栏，然后在某些实例中应用颜色等样式。我遇到了两个问题：

当您在UITabBar的实例上使用setTitleTextAttributes:forState:设置任何titleTextAttributes时，它会立即忽略在外观代理上设置的任何titleTextAttributes（包括未在实例上设置但在外观上设置的键代理）。

// AppDelegate
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    UITabBarItem.appearance().setTitleTextAttributes([
        NSFontAttributeName: UIFont(name: "Lato-Regular", size: 20.0)!
        ], forState: .Normal)
}

// Later on in a ViewController that has a UITabBar
override func viewDidLoad() {
    myTabBar.setTitleTextAttributes([
        NSForegroundColorAttributeName: UIColor.blueColor()
        ], forState: .Normal)

    // Tab bar items now have blue text, but Helvetica Neue font
    // We've lost the appearance proxy font (Lato-Regular)
}

为了修复（1）我只是从外观代理复制titleTextAttributes，然后用我想在实例上应用的任何属性覆盖它们。例如。

// AppDelegate
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    UITabBarItem.appearance().setTitleTextAttributes([
        NSFontAttributeName: UIFont(name: "Lato-Regular", size: 20.0)!
        ], forState: .Normal)
}

// Later on in a ViewController that has a UITabBar
override func viewDidLoad() {
    var attributes = UITabBarItem.appearance().titleTextAttributesForState(state) ?? [NSObject: AnyObject]()

    assert(attributes.count > 0, "Could not read titleTextAttributes set on appearance proxy!")
}

这是最烦人的，因为你可以在UINavigationBar上读取外观代理值就好了。

有什么想法吗？

无法在UITabBarItem的外观上读取titleTextAttributes

0 个答案: