Checking iOS version at runtime

@interface DeviceUtil : NSObject {

}

+(BOOL)osVersionSupported:(NSString*)version;

@end

#import "DeviceUtil.h"

@implementation DeviceUtil

//    e.g. [DeviceUtil osVersionSupported:@"4.1"]

+(BOOL)osVersionSupported:(NSString*)version {

    NSString *currSysVer = [[UIDevice currentDevice] systemVersion];

    BOOL osVersionSupported = ([currSysVer

            compare:version

            options:NSNumericSearch] != NSOrderedAscending);

    return osVersionSupported;

}

@end