IOS开发-判断ios设备和系统版本的方法

1，判断ios设备

#define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
#define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
#define IS_RETINA ([[UIScreen mainScreen] scale] >= 2.0)

#define SCREEN_WIDTH ([[UIScreen mainScreen] bounds].size.width)
#define SCREEN_HEIGHT ([[UIScreen mainScreen] bounds].size.height)
#define SCREEN_MAX_LENGTH (MAX(SCREEN_WIDTH, SCREEN_HEIGHT))
#define SCREEN_MIN_LENGTH (MIN(SCREEN_WIDTH, SCREEN_HEIGHT))

#define IS_IPHONE_4_OR_LESS (IS_IPHONE && SCREEN_MAX_LENGTH < 568.0)
#define IS_IPHONE_5 (IS_IPHONE && SCREEN_MAX_LENGTH == 568.0)
#define IS_IPHONE_6 (IS_IPHONE && SCREEN_MAX_LENGTH == 667.0)
#define IS_IPHONE_6P (IS_IPHONE && SCREEN_MAX_LENGTH == 736.0)

2，判断系统版本的方法

//判断系统版本
#define iOS7 ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)
#pragma mark 一个类只会调用一次
+ (void)initialize //设置不同的设备舍hi不同的导航栏
{
// 1.取出设置主题的对象
UINavigationBar *navBar = [UINavigationBar appearance];

// 2.设置导航栏的背景图片
NSString *navBarBg = nil;
if (iOS7) { // iOS7
navBarBg = @"NavBar64";
navBar.tintColor = [UIColor whiteColor];
} else { // 非iOS7
navBarBg = @"NavBar";
[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleBlackOpaque;
}
[navBar setBackgroundImage:[UIImage imageNamed:navBarBg] forBarMetrics:UIBarMetricsDefault];

// 3.标题
[navBar setTitleTextAttributes:@{
UITextAttributeTextColor : [UIColor whiteColor]
}];
}