IOS开发常用函数

1、获取本地的语言

+ (NSString *)getLocalLanguage
{
    NSString *language = [[[NSUserDefaults standardUserDefaults] objectForKey:@"AppleLanguages"] objectAtIndex:0];
    return language;
}

2、获取Mac地址

// returns the local MAC address.
+ (NSString*) macAddress:(NSString*)interfaceNameOrNil
{
    // uses en0 as the default interface name
    NSString* interfaceName = interfaceNameOrNil;
    if (interfaceName == nil)
    {
        interfaceName = @"en0";
    }

    int                 mib[6];
    size_t              len;
    char                *buf;
    unsigned char       *ptr;
    struct if_msghdr    *ifm;
    struct sockaddr_dl  *sdl;

    mib[0] = CTL_NET;
    mib[1] = AF_ROUTE;
    mib[2] = 0;
    mib[3] = AF_LINK;
    mib[4] = NET_RT_IFLIST;

    if ((mib[5] = if_nametoindex([interfaceName UTF8String])) == 0)
    {
        printf("Error: if_nametoindex error\n");
        return NULL;
    }

    if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
    {
        printf("Error: sysctl, take 1\n");
        return NULL;
    }

    if ((buf = malloc(len)) == NULL)
    {
        printf("Could not allocate memory. error!\n");
        return NULL;
    }

    if (sysctl(mib, 6, buf, &len, NULL, 0) < 0)
    {
        printf("Error: sysctl, take 2");
        free(buf);
        return NULL;
    }

    ifm = (struct if_msghdr*) buf;
    sdl = (struct sockaddr_dl*) (ifm + 1);
    ptr = (unsigned char*) LLADDR(sdl);
    NSString *outstring = [NSString stringWithFormat:@"%02X:%02X:%02X:%02X:%02X:%02X",
                           *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];
    free(buf);

    return outstring;
}

3、微博中获取时间差，（几天前，几小时前，几分钟前）

+ (NSString *) getTimeDiffString:(NSTimeInterval) timestamp
{

    NSCalendar *cal = [NSCalendar currentCalendar];
    NSDate *todate = [NSDate dateWithTimeIntervalSince1970:timestamp];
    NSDate *today = [NSDate date];//当前时间
    unsigned int unitFlag = NSDayCalendarUnit | NSHourCalendarUnit |NSMinuteCalendarUnit;
    NSDateComponents *gap = [cal components:unitFlag fromDate:today toDate:todate options:0];//计算时间差

    if (ABS([gap day]) > 0)
    {
        return [NSString stringWithFormat:@"%d天前", ABS([gap day])];
    }else if(ABS([gap hour]) > 0)
    {
        return [NSString stringWithFormat:@"%d小时前", ABS([gap hour])];
    }else
    {
        return [NSString stringWithFormat:@"%d分钟前",  ABS([gap minute])];
    }
}

4、计算字符串中单词的个数

+ (int)countWords:(NSString*)s
{
    int i,n=[s length],l=0,a=0,b=0;
    unichar c;
    for(i=0;i<n;i++){
        c=[s characterAtIndex:i];
        if(isblank(c))
        {
            b++;
        }else if(isascii(c))
        {
            a++;
        }else
        {
            l++;
        }
    }
    if(a==0 && l==0)
    {
        return 0;
    }
    return l+(int)ceilf((float)(a+b)/2.0);
}

5、屏幕截图并保存到相册

+ (UIImage*)saveImageFromView:(UIView*)view
{
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, view.layer.contentsScale);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

+ (void)savePhotosAlbum:(UIImage *)image
{
    UIImageWriteToSavedPhotosAlbum(image, self, @selector(imageSavedToPhotosAlbum: didFinishSavingWithError: contextInfo:), nil);
}

+ (void)saveImageFromToPhotosAlbum:(UIView*)view
{
    UIImage *image = [self saveImageFromView:view];
    [self savePhotosAlbum:image];
}

- (void)imageSavedToPhotosAlbum:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *) contextInfo
{
    NSString *message;
    NSString *title;
    if (!error) {
        title = @"成功提示";
        message = @"成功保存到相";
    } else {
        title = @"失败提示";
        message = [error description];
    }
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title
                                                    message:message
                                                   delegate:nil
                                          cancelButtonTitle:@"知道了"
                                          otherButtonTitles:nil];
    [alert show];
    [alert release];
}

5、获取本月，本周，本季度第一天的时间戳

+ (unsigned long long)getFirstDayOfWeek:(unsigned long long)timestamp
{
    NSDate *now = [NSDate dateWithTimeIntervalSince1970:timestamp];
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSDateComponents *comps = [cal
                               components:NSYearCalendarUnit| NSMonthCalendarUnit| NSWeekCalendarUnit | NSWeekdayCalendarUnit |NSWeekdayOrdinalCalendarUnit
                               fromDate:now];
    if (comps.weekday <2)
    {
        comps.week = comps.week-1;
    }
    comps.weekday = 2;
    NSDate *firstDay = [cal dateFromComponents:comps];
    return [firstDay timeIntervalSince1970];
}

+ (unsigned long long)getFirstDayOfQuarter:(unsigned long long)timestamp
{
    NSDate *now = [NSDate dateWithTimeIntervalSince1970:timestamp];
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSDateComponents *comps = [cal
                               components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit
                               fromDate:now];
    if (comps.month <=3)
    {
        comps.month =  1;
    }
    else if(comps.month<=6)
    {
        comps.month =  4;
    }
    else if(comps.month<=9)
    {
        comps.month =  7;
    }
    else if(comps.month<=12)
    {
        comps.month =  10;
    }

    comps.day = 1;
    NSDate *firstDay = [cal dateFromComponents:comps];
    return [firstDay timeIntervalSince1970]*1000;
}

+ (unsigned long long)getFirstDayOfMonth:(unsigned long long)timestamp
{
    NSDate *now = [NSDate dateWithTimeIntervalSince1970:timestamp/1000];
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSDateComponents *comps = [cal
                               components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit
                               fromDate:now];
    comps.day = 1;
    NSDate *firstDay = [cal dateFromComponents:comps];
    return [firstDay timeIntervalSince1970]*1000;
}

6、判断是否越狱

static const char * __jb_app = NULL;

+ (BOOL)isJailBroken
{
    static const char * __jb_apps[] =
    {
        "/Application/Cydia.app",
        "/Application/limera1n.app",
        "/Application/greenpois0n.app",
        "/Application/blackra1n.app",
        "/Application/blacksn0w.app",
        "/Application/redsn0w.app",
        NULL
    };

    __jb_app = NULL;

    // method 1
    for ( int i = 0; __jb_apps[i]; ++i )
    {
        if ( [[NSFileManager defaultManager] fileExistsAtPath:[NSString stringWithUTF8String:__jb_apps[i]]] )
        {
            __jb_app = __jb_apps[i];
            return YES;
        }
    }

    // method 2
    if ( [[NSFileManager defaultManager] fileExistsAtPath:@"/private/var/lib/apt/"] )
    {
        return YES;
    }

    // method 3
    if ( 0 == system("ls") )
    {
        return YES;
    }

    return NO;
}

+ (NSString *)jailBreaker
{
    if ( __jb_app )
    {
        return [NSString stringWithUTF8String:__jb_app];
    }
    else
    {
        return @"";
    }
}

7、定义单例的宏

#undef  AS_SINGLETON
#define AS_SINGLETON( __class ) \
        + (__class *)sharedInstance;

#undef  DEF_SINGLETON
#define DEF_SINGLETON( __class ) \
        + (__class *)sharedInstance \
        { \
            static dispatch_once_t once; \
            static __class * __singleton__; \
            dispatch_once( &once, ^{ __singleton__ = [[__class alloc] init]; } ); \
            return __singleton__; \
        }

8、网络状态检测

- (void)reachabilityChanged:(NSNotification *)note {
    Reachability* curReach = [note object];
    NSParameterAssert([curReach isKindOfClass: [Reachability class]]);
    NetworkStatus status = [curReach currentReachabilityStatus];

    if (status == NotReachable)
    {

    }
    else if(status == kReachableViaWiFi)
    {

    }
    else if(status == kReachableViaWWAN)
    {

    }

}

- (void)setNetworkNotification
{
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(reachabilityChanged:)
                                                 name: kReachabilityChangedNotification
                                               object: nil];
    _hostReach = [[Reachability reachabilityWithHostName:@"http://www.baidu.com"] retain];
    [_hostReach startNotifier];
}

9、添加推送消息

- (void)setPushNotification
{
    [[UIApplication sharedApplication] registerForRemoteNotificationTypes:UIRemoteNotificationTypeAlert|UIRemoteNotificationTypeBadge|UIRemoteNotificationTypeSound];
}


- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
    NSLog(@"获取设备的deviceToken: %@", deviceToken);
}

- (void)application:(UIApplication*)application didFailToRegisterForRemoteNotificationsWithError:(NSError*)error{

    NSLog(@"Failed to get token, error: %@", error);
}

10、16进制颜色转UIColor

+ (UIColor *)colorWithHex:(NSString *)hex {
    // Remove `#` and `0x`
    if ([hex hasPrefix:@"#"]) {
        hex = [hex substringFromIndex:1];
    } else if ([hex hasPrefix:@"0x"]) {
        hex = [hex substringFromIndex:2];
    }

    // Invalid if not 3, 6, or 8 characters
    NSUInteger length = [hex length];
    if (length != 3 && length != 6 && length != 8) {
        return nil;
    }

    // Make the string 8 characters long for easier parsing
    if (length == 3) {
        NSString *r = [hex substringWithRange:NSMakeRange(0, 1)];
        NSString *g = [hex substringWithRange:NSMakeRange(1, 1)];
        NSString *b = [hex substringWithRange:NSMakeRange(2, 1)];
        hex = [NSString stringWithFormat:@"%@%@%@%@%@%@ff",
               r, r, g, g, b, b];
    } else if (length == 6) {
        hex = [hex stringByAppendingString:@"ff"];
    }

    CGFloat red = [[hex substringWithRange:NSMakeRange(0, 2)] _hexValue] / 255.0f;
    CGFloat green = [[hex substringWithRange:NSMakeRange(2, 2)] _hexValue] / 255.0f;
    CGFloat blue = [[hex substringWithRange:NSMakeRange(4, 2)] _hexValue] / 255.0f;
    CGFloat alpha = [[hex substringWithRange:NSMakeRange(6, 2)] _hexValue] / 255.0f;

    return [UIColor colorWithRed:red green:green blue:blue alpha:alpha];
}