【IOS】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 2if ( [[NSFileManager defaultManager] fileExistsAtPath:@"/private/var/lib/apt/"] ){return YES;}// method 3if ( 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

#undefAS_SINGLETON#define AS_SINGLETON( __class ) \+ (__class *)sharedInstance;#undefDEF_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 charactersNSUInteger length = [hex length];if (length != 3 && length != 6 && length != 8) {return nil;}// Make the string 8 characters long for easier parsingif (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];}