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iOS version

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[[UIDevice currentDevice] systemVersion]

返回一条string, 比如@“8.0” 就代表当前版本是iOS8.0
macro:

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#define SYSTEM_VERSION_EQUAL_TO(v)                  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame)
#define SYSTEM_VERSION_GREATER_THAN(v)              ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending)
#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN(v)                 ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v)     ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending)

iPhone or iPad

这个简单

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#define DEVICE_IS_IPHONE ( UIUserInterfaceIdiomPhone == UI_USER_INTERFACE_IDIOM() )
#define DEVICE_IS_IPAD ( UIUserInterfaceIdiomPad == UI_USER_INTERFACE_IDIOM())

Device version

  1. 第一种方法，用model identifier来找。来源。model identifiler list

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    - (NSString *) platform{
        size_t size;
        sysctlbyname("hw.machine", NULL, &size, NULL, 0);
        char *machine = malloc(size);
        sysctlbyname("hw.machine", machine, &size, NULL, 0);
        NSString *platform = [NSString stringWithUTF8String:machine];
        free(machine);
        return platform;
    }
    - (NSString *) platformString{
        NSString *platform = [self platform];
        if ([platform isEqualToString:@"iPhone1,1"])    return @"iPhone 1G";
        if ([platform isEqualToString:@"iPhone1,2"])    return @"iPhone 3G";
        if ([platform isEqualToString:@"iPhone2,1"])    return @"iPhone 3GS";
        if ([platform isEqualToString:@"iPhone3,1"])    return @"iPhone 4";
        if ([platform isEqualToString:@"iPhone3,3"])    return @"Verizon iPhone 4";
        if ([platform isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";
        if ([platform isEqualToString:@"iPod1,1"])      return @"iPod Touch 1G";
        if ([platform isEqualToString:@"iPod2,1"])      return @"iPod Touch 2G";
        if ([platform isEqualToString:@"iPod3,1"])      return @"iPod Touch 3G";
        if ([platform isEqualToString:@"iPod4,1"])      return @"iPod Touch 4G";
        if ([platform isEqualToString:@"iPad1,1"])      return @"iPad";
        if ([platform isEqualToString:@"iPad2,1"])      return @"iPad 2 (WiFi)";
        if ([platform isEqualToString:@"iPad2,2"])      return @"iPad 2 (GSM)";
        if ([platform isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";
        if ([platform isEqualToString:@"i386"])         return @"Simulator";
        if ([platform isEqualToString:@"x86_64"])       return @"Simulator";
        return platform;
    }

  2. 第二种方法，用屏幕大小来区分。个人认为这种方法更好，model的种类太多了而且容易写错，而且毕竟检查iPhone版本很多时候也是在适配屏幕，代码来源

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    #define DEVICE_IS_IPHONE_4 DEVICE_SCREEN_HAS_LENGTH([UIScreen mainScreen].bounds, 480.)
    #define DEVICE_IS_IPHONE_5 DEVICE_SCREEN_HAS_LENGTH([UIScreen mainScreen].bounds, 568.)
    #define DEVICE_IS_IPHONE_6 DEVICE_SCREEN_HAS_LENGTH([UIScreen mainScreen].bounds, 667.)
    #define DEVICE_IS_IPHONE_6_PLUS DEVICE_SCREEN_HAS_LENGTH([UIScreen mainScreen].bounds, 736.)

App version

app version 和 build version

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NSString *appVersion = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleShortVersionString"];
NSString *buildVersion = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleVersion"];

is Retina ?

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#define isRetina ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 960), [[UIScreen mainScreen] currentMode].size) : NO)

github 上找到的一些macros

CJAMacros
GBDeviceInfo
ios macro
numo16/Macros.h