iOS 系统版本判断

#define IOS9_OR_LATER ( [[[UIDevice currentDevice] systemVersion] compare:@"9.0"] != NSOrderedAscending )

#define IOS8_OR_LATER ( [[[UIDevice currentDevice] systemVersion] compare:@"8.0"] != NSOrderedAscending )

#define IOS7_OR_LATER ( [[[UIDevice currentDevice] systemVersion] compare:@"7.0"] != NSOrderedAscending )

#define IOS6_OR_LATER ( [[[UIDevice currentDevice] systemVersion] compare:@"6.0"] != NSOrderedAscending )

#define IOS5_OR_LATER ( [[[UIDevice currentDevice] systemVersion] compare:@"5.0"] != NSOrderedAscending )

#define IOS4_OR_LATER ( [[[UIDevice currentDevice] systemVersion] compare:@"4.0"] != NSOrderedAscending )

#define IOS3_OR_LATER ( [[[UIDevice currentDevice] systemVersion] compare:@"3.0"] != NSOrderedAscending )

 

#define IS_IPAD         (UI_USER_INTERFACE_IDIOM()==UIUserInterfaceIdiomPad)

#define IS_IPHONE_5     [SNSystemInfo is_iPhone_5];

+ (NSString *)osVersion
{
    return [[UIDevice currentDevice] systemVersion];
}

+ (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 stringWithCString:machine encoding:NSUTF8StringEncoding];
    free(machine);
    return platform;
}

+ (NSString *)platformString
{
    NSString *platform = [self platform];
    
    if ([platform isEqualToString:@"iPhone1,1"])   return @"iPhone1G GSM";
    if ([platform isEqualToString:@"iPhone1,2"])   return @"iPhone3G GSM";
    if ([platform isEqualToString:@"iPhone2,1"])   return @"iPhone3GS GSM";
    if ([platform isEqualToString:@"iPhone3,1"])   return @"iPhone4 GSM";
    if ([platform isEqualToString:@"iPhone3,3"])   return @"iPhone4 CDMA";
    if ([platform isEqualToString:@"iPhone4,1"])   return @"iPhone4S";
    if ([platform isEqualToString:@"iPhone5,1"])   return @"iPhone5";
    if ([platform isEqualToString:@"iPhone5,2"])   return @"iPhone5";
    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 @"iPad1 WiFi";
    if ([platform isEqualToString:@"iPad2,1"])   return @"iPad2 WiFi";
    if ([platform isEqualToString:@"iPad2,2"])   return @"iPad2 GSM";
    if ([platform isEqualToString:@"iPad2,3"])   return @"iPad2 CDMAV";
    if ([platform isEqualToString:@"iPad2,4"])   return @"iPad2 CDMAS";
    if ([platform isEqualToString:@"iPad2,5"])   return @"iPad mini WiFi";
    if ([platform isEqualToString:@"iPad3,1"])   return @"iPad3 WiFi";
    if ([platform isEqualToString:@"iPad3,2"])   return @"iPad3 GSM";
    if ([platform isEqualToString:@"iPad3,3"])   return @"iPad3 CDMA";
    if ([platform isEqualToString:@"i386"] || [platform isEqualToString:@"x86_64"])
        return @"iPhone Simulator";
    
    return platform;
}

//获取系统当前时间
+ (NSString *)systemTimeInfo
{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSString *currentDateString = [dateFormatter stringFromDate:[NSDate date]];
    return currentDateString;
}

+ (NSString *)appVersion
{
    NSString *version = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleShortVersionString"];
    return [NSString stringWithFormat:@"%@", version];
}

+ (BOOL)is_iPhone_5
{
    if ([UIScreen mainScreen].bounds.size.height == 568.0f) {
        return YES;
    }else{
        return NO;
    }
}