Support AirDrop or not

support-air-drop.m

#import <sys/types.h>
#import <sys/sysctl.h>



+ (NSString *)machineName
{
    size_t size;
    if (sysctlbyname("hw.machine", NULL, &size, NULL, 0) < 0) {
        return nil;
    }
    char *name = malloc(size);
    if (sysctlbyname("hw.machine", name, &size, NULL, 0) < 0) {
        free(name);
        return nil;
    }

    NSString *machine = [NSString stringWithCString:name encoding:NSUTF8StringEncoding];
    free(name);
    return machine;
}

+ (BOOL)machineComponentsWithName:(NSString **)theName major:(NSString **)theMajor minor:(NSString **)theMinor
{
    NSString *machineName = [self machineName];
    if ([machineName length]) {
        int ii = 0;
        for (; ii < [machineName length]; ii++) {
            unichar c = [machineName characterAtIndex:ii];
            if (c >= '0' && c <= '9') {
                // End of name, begin of major
                if (theName) {
                    *theName = [machineName substringToIndex:ii];
                    break;
                }
            }
        }
        int jj = ii;
        for (; jj < [machineName length]; jj++) {
            if ([machineName characterAtIndex:jj] == ',') {
                if (theMajor) {
                    *theMajor = [machineName substringWithRange:NSMakeRange(ii, jj - ii)];
                }
                if (theMinor) {
                    *theMinor = [machineName substringFromIndex:jj + 1];
                }
                return YES;
            }
        }
    }
    return NO;
}

+ (BOOL)supportsAirdrop
{
    if ([RCActivityUtil iOS7]) { // This checks if the device is running iOS 7 or greater, use [[UIDevice currentDevice] systemVersion]
        NSString *theName = nil;
        NSString *theMajor = nil;
        NSString *theMinor = nil;
        if ([self machineComponentsWithName:&theName major:&theMajor minor:&theMinor]) {
            if ([theName isEqualToString:@"iPhone"] || [theName isEqualToString:@"iPod"]) {
                return [theMajor intValue] >= 5;
            }
            if ([theName isEqualToString:@"iPad"]) {
                return ([theMajor intValue] == 2 && [theMinor intValue] >= 5) || // iPad mini
                    ([theMajor intValue] == 3 && [theMinor intValue] >= 4) || // iPad 4
                    [theMajor intValue] >= 4; // Suppose all future models will support AirDrop
            }
        }
    }
    return NO;
}