ios - UIToolbar 偏移 - 出现黑条

Question

这是我的 Swift 代码 (AppDelegate.swift):

var window: UIWindow?
var rootViewController :UIViewController?

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

    if ((UIDevice.currentDevice().systemVersion as NSString).floatValue >= 7) {
        //yes, I'm using a newer iOS - greater/equal to iOS 7
        rootViewController  = Login(nibName:"Login",bundle:nil)
        let x = UIScreen.mainScreen().bounds.size.width
        let y = UIScreen.mainScreen().bounds.size.height
        let frame = CGRectMake(0,20,x,y)
        window = UIWindow(frame: frame)

        window!.rootViewController = rootViewController
        window!.makeKeyAndVisible()                

        //window!.frame =  CGRectMake(0,20,window!.frame.size.width,window!.frame.size.height-20);
     }

     return true
}

我试图将屏幕向下偏移 20 像素。

这是我的模拟器使用上面的代码(错误!)的样子:

如果我什么都不做(错误!)，这是它的样子:

这就是我想要的样子!

我已经在这里工作了几个小时。

我想要一种稳健且易于管理的方法来将所有内容向下移动 20 像素。

(附注:我不使用 Storyboard)

Answer 1

这似乎可行:

        rootViewController  = Login(nibName:"Login",bundle:nil)

        if ((UIDevice.currentDevice().systemVersion as NSString).floatValue >= 8) {
            //For iOS 8
            rootViewController?.providesPresentationContextTransitionStyle = true
            rootViewController?.definesPresentationContext = true;
            rootViewController?.modalPresentationStyle = UIModalPresentationStyle.CurrentContext
        }else{
            //For iOS 7
            rootViewController?.modalPresentationStyle = UIModalPresentationStyle.CurrentContext
        }
        let x = UIScreen.mainScreen().bounds.size.width
        let y = UIScreen.mainScreen().bounds.size.height
        let frame = CGRectMake(0, 0, x, y)
        window = UIWindow(frame: frame)
        window!.rootViewController = rootViewController
        window!.makeKeyAndVisible()