iOS version check

UIDevice+NKOSVersionCheck.h

#import <Foundation/Foundation.h>

@interface UIDevice(NKOSVersionCheck)

+ (BOOL)nko_isRunningOnIOS7OrLater;

@end

UIDevice+NKOSVersionCheck.m

#import "UIDevice+OSVersionCheck.h"

@implementation UIDevice(NKOSVersionCheck)

+ (BOOL)nko_isRunningOnIOS7OrLater
{
    NSString *reqSysVer = @"7.0";
    NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
    return [currSysVer compare:reqSysVer options:NSNumericSearch] != NSOrderedAscending;
}

@end