获取iphone手机屏幕分辨率

    //1 Available in iOS 4.0 and later  

    UIScreen *MainScreen = [UIScreen mainScreen];
    CGSize Size = [MainScreen bounds].size;
    CGFloat scale = [MainScreen scale];
    CGFloat screenWidth = Size.width * scale;
    CGFloat screenHeight = Size.height * scale;    

    // 2 Available in iOS 3.2 and later

    UIScreen *MainScreen = [UIScreen mainScreen];
    UIScreenMode *ScreenMode = [MainScreen currentMode];
    CGSize Size = [ScreenMode size];
    CGFloat screenWidth = Size.width;
    CGFloat screenHeight = Size.height;