iphone - 如何确定 iphone/ipad/ipod/appletv 是旧的、更新的还是与同一系列的其他设备相同？

Question

如何比较不同的平台？

例子:我想知道当前设备是否比 iPhone 4S 更旧。

Answer 1

将这些方法添加到某个类(例如 YourClass):

+(NSString*)deviceVersion{
    // get hardware device version string
    struct utsname systemInfo;
    uname(&systemInfo);
    return [NSString stringWithCString:systemInfo.machine
                              encoding:NSUTF8StringEncoding];
    /*      possible values:
     @"i386" (or similar)     on the simulator //
     @"iPod1,1"   on iPod Touch
     @"iPod2,1"   on iPod Touch Second Generation
     @"iPod3,1"   on iPod Touch Third Generation
     @"iPod4,1"   on iPod Touch Fourth Generation
     @"iPhone1,1" on iPhone
     @"iPhone1,2" on iPhone 3G
     @"iPhone2,1" on iPhone 3GS
     @"iPad1,1"   on iPad
     @"iPad2,1"   on iPad 2
     @"iPad3,1"   on iPad 3 (aka new iPad)
     @"iPhone3,1" on iPhone 4
     @"iPhone4,1" on iPhone 4S
     @"iPhone5,1" on iPhone 5
     @"iPhone5,2" on iPhone 5
     ...future version...?       */
}

+(NSNumber *)getVersionForDevice:(NSString*)deviceToCheck{
    NSNumber* versionNumber = nil;
    if (deviceToCheck && ![deviceToCheck isEqualToString:@""]) {
        NSString* deviceMachine = [Utils deviceVersion];
        NSString* deviceVersion = nil;
        if ([deviceMachine hasPrefix:deviceToCheck]) {
            deviceVersion = [deviceMachine stringByReplacingOccurrencesOfString:deviceToCheck withString:@""];
            deviceVersion = [deviceVersion stringByReplacingOccurrencesOfString:@"," withString:@"."];
            float floatVersion = [deviceVersion floatValue];
            versionNumber = [NSNumber numberWithFloat:floatVersion];
        }
    }
    return versionNumber;
}


+(BOOL)isSimulator{
    NSString* deviceMachine = [Utils deviceVersion];
    //    NSLog(@"Utils deviceMachine: %@", deviceMachine);
    if (![deviceMachine hasPrefix:@"iPhone"] && ![deviceMachine hasPrefix:@"iPod"] && ![deviceMachine hasPrefix:@"iPad"]) {
        return 1;
    }
    return 0;
}

然后，如果在 iPhone 上并且想测试版本:

float iPhoneVersion = [[YourClass getVersionForDevice:@"iPhone"] floatValue];

并为 iPad...iPod...做类似的调用