java代碼  

1. let orientation: UIInterfaceOrientation = UIapplication.sharedApplication().statusBarOrientation  
2.      PRintln("Currently landscape: " + ((orientation == UIInterfaceOrientation.LandscapeLeft||orientation == UIInterfaceOrientation.LandscapeRight) ?"YES":"NO"))  
3.      println("UIScreen.mainScreen().bounds: /(UIScreen.mainScreen().bounds)")  
4.      println("UIScreen.mainScreen().applicationFrame: /(UIScreen.mainScreen().applicationFrame)")  

   let orientation: UIInterfaceOrientation = UIApplication.sharedApplication().statusBarOrientation        println("Currently landscape: " + ((orientation == UIInterfaceOrientation.LandscapeLeft||orientation == UIInterfaceOrientation.LandscapeRight) ?"YES":"NO"))        println("UIScreen.mainScreen().bounds: /(UIScreen.mainScreen().bounds)")        println("UIScreen.mainScreen().applicationFrame: /(UIScreen.mainScreen().applicationFrame)")

 在ios7中輸出：

Currently landscape: NO

UIScreen.mainScreen().bounds: (0.0,0.0,320.0,568.0)

UIScreen.mainScreen().applicationFrame: (0.0,20.0,320.0,548.0)

Currently landscape: YES

UIScreen.mainScreen().bounds: (0.0,0.0,320.0,568.0)

UIScreen.mainScreen().applicationFrame: (20.0,0.0,300.0,568.0)

在ios8中輸出：

Currently landscape: NO

UIScreen.mainScreen().bounds: (0.0,0.0,320.0,568.0)

UIScreen.mainScreen().applicationFrame: (0.0,20.0,320.0,548.0)

Currently landscape: YES

UIScreen.mainScreen().bounds: (0.0,0.0,568.0,320.0)

UIScreen.mainScreen().applicationFrame: (0.0,0.0,568.0,320.0)

結論：

1、在ios7中UIScreen.mainScreen().bounds是固定不變的值，在ios8中他的值是隨橫豎屏改變的！

為了在ios8中得到原來的效果可以：

Java代碼  

1. + (CGSize)screenSize {  
2.     CGSize screenSize = [UIScreen mainScreen].bounds.size;  
3.     return CGSizeMake(MIN(screenSize.width, screenSize.height), MAX(screenSize.width, screenSize.height));  
4. }  

+ (CGSize)screenSize {    CGSize screenSize = [UIScreen mainScreen].bounds.size;    return CGSizeMake(MIN(screenSize.width, screenSize.height), MAX(screenSize.width, screenSize.height));}

2、

在ios8中增加了2個屬性：

nativeBounds :  屏幕像素，不隨橫豎平改變的！

nativeScale   ：1(non retina)/2(retina)/3(retina hd)

https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIScreen_Class/index.html

ios8輸出：

Currently landscape: YES

UIScreen.mainScreen().bounds: (0.0,0.0,568.0,320.0)

UIScreen.mainScreen().applicationFrame: (0.0,20.0,568.0,300.0)

UIScreen.mainScreen().nativeBounds: (0.0,0.0,640.0,1136.0)

UIScreen.mainScreen().nativeScale: 2.0

Currently landscape: NO

UIScreen.mainScreen().bounds: (0.0,0.0,320.0,568.0)

UIScreen.mainScreen().applicationFrame: (0.0,20.0,320.0,548.0)

UIScreen.mainScreen().nativeBounds: (0.0,0.0,640.0,1136.0)

UIScreen.mainScreen().nativeScale: 2.0

3、從UIScreen.mainScreen().applicationFrame輸出值看出，ios8默認橫屏statusbar是隱藏掉了。你可以根據plist中

View controller-based status bar appearance的值的不同來用       

Java代碼  

1. UIApplication.sharedApplication().setStatusBarHidden(false, withAnimation: UIStatusBarAnimation.None)  

UIApplication.sharedApplication().setStatusBarHidden(false, withAnimation: UIStatusBarAnimation.None)

或

Java代碼  

1. override func prefersstatusBarHidden() -> Bool {  
2.       return false  
3.   
4.   }  

  override func prefersStatusBarHidden() -> Bool {        return false     }

顯示橫屏statusbar