iOS 屏幕适配

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（1）UIScreen.bounds

// Bounds of entire screen in points（本地坐标系，起点为[0,0]）
@property(nonatomic,readonly) CGRect bounds;
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//考虑转屏的影响，按照实际屏幕方向（UIDeviceOrientation）的宽高
#define SCREEN_WIDTH ([UIScreenmainScreen].bounds.size.width)
#define SCREEN_HEIGHT ([UIScreenmainScreen].bounds.size.height)
#define STATUSBAR_HEIGHT ([UIApplicationsharedApplication].statusBarFrame.size.height)
//不考虑转屏的影响，只取竖屏（UIDeviceOrientationPortrait）的宽高
#define SCREEN_WIDTH MIN([UIScreenmainScreen].bounds.size.width,
[UIScreenmainScreen].bounds.size.height)
#define SCREEN_HEIGHT MAX([UIScreenmainScreen].bounds.size.height,
[UIScreenmainScreen].bounds.size.width)
#define STATUSBAR_HEIGHT MIN([UIApplicationsharedApplication].statusBarFrame.size.width,
[UIApplicationsharedApplication].statusBarFrame.size.height)