『IOS』ios8中的UIScreen_uiscreen nativebounds-优快云博客

本文详细解读了iOS8中UIScreen.mainScreen().bounds属性的变化，包括新增的nativeBounds和nativeScale属性，以及屏幕默认状态栏的变化。文章还提供了代码示例帮助开发者理解iOS8的界面响应性。

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1、在ios7中UIScreen.mainScreen().bounds是固定不变的值，在ios8中他的值是随横竖屏改变的！

在ios8中增加了2个属性：

nativeBounds : 屏幕像素，不随横竖平改变的！

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

3、从UIScreen.mainScreen().applicationFrame输出值看出，ios8默认横屏statusbar是隐藏掉了。你可以根据plist中

View controller-based status bar appearance的值的不同来用

Is [UIScreen mainScreen].bounds.size becoming orientation-dependent in iOS8?

Yes, it's orientation-dependent in iOS8, not a bug. You could review session 214 from WWDC 2014 for more info: "View Controller Advancements in iOS 8"

Quote from the presentation:

UIScreen is now interface oriented:

[UIScreen bounds] now interface-oriented
[UIScreen applicationFrame] now interface-oriented
Status bar frame notifications are interface-oriented
Keyboard frame notifications are interface-oriented

+ (CGSize)screenSize {
    CGSize screenSize = [UIScreen mainScreen].bounds.size;
    if ((NSFoundationVersionNumber <= NSFoundationVersionNumber_iOS_7_1) && UIInterfaceOrientationIsLandscape([UIApplication sharedApplication].statusBarOrientation)) {
        return CGSizeMake(screenSize.height, screenSize.width);
    }
    return screenSize;
}

+ (CGRect)screenBoundsFixedToPortraitOrientation {
    UIScreen *screen = [UIScreen mainScreen];

    if ([screen respondsToSelector:@selector(fixedCoordinateSpace)]) {
                    return [screen.coordinateSpace convertRect:screen.bounds toCoordinateSpace:screen.fixedCoordinateSpace];
    } 
    return screen.bounds;
}

#ifndef NSFoundationVersionNumber_iOS_7_1
# define NSFoundationVersionNumber_iOS_7_1 1047.25
#endif

@implementation UIScreen (Legacy)

// iOS 8 way of returning bounds for all SDK's and OS-versions
- (CGRect)boundsRotatedWithStatusBar
{
    static BOOL isNotRotatedBySystem;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        BOOL OSIsBelowIOS8 = [[[UIDevice currentDevice] systemVersion] floatValue] < 8.0;
        BOOL SDKIsBelowIOS8 = floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_7_1;
        isNotRotatedBySystem = OSIsBelowIOS8 || SDKIsBelowIOS8;
    });

    BOOL needsToRotate = isNotRotatedBySystem && UIInterfaceOrientationIsLandscape([UIApplication sharedApplication].statusBarOrientation);
    if(needsToRotate)
    {
        CGRect screenBounds = [self bounds];
        CGRect bounds = screenBounds;
        bounds.size.width = screenBounds.size.height;
        bounds.size.height = screenBounds.size.width;
        return bounds;
    }
    else
    {
        return [self bounds];
    }
}

@end

#define SCREEN_WIDTH (IOS_VERSION_LOWER_THAN_8 ? (UIInterfaceOrientationIsPortrait([UIApplication sharedApplication].statusBarOrientation) ? [[UIScreen mainScreen] bounds].size.width : [[UIScreen mainScreen] bounds].size.height) : [[UIScreen mainScreen] bounds].size.width)

#define SCREEN_HEIGHT (IOS_VERSION_LOWER_THAN_8 ? (UIInterfaceOrientationIsPortrait([UIApplication sharedApplication].statusBarOrientation) ? [[UIScreen mainScreen] bounds].size.height : [[UIScreen mainScreen] bounds].size.width) : [[UIScreen mainScreen] bounds].size.height)

#define IOS_VERSION_LOWER_THAN_8 (NSFoundationVersionNumber <= NSFoundationVersionNumber_iOS_7_1)