[IOS] common functions for iOS development

1. Obtain the local language

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

2. Obtain the MAC address

// 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. Get Time Difference on Weibo (several days ago, several hours ago, several minutes ago)

+ (Nsstring *) gettimediffstring :( nstimeinterval) timestamp {nscalendar * Cal = [nscalendar currentcalendar]; nsdate * todate = [nsdate expires: Timestamp]; nsdate * today = [nsdate date]; // current time unsigned int unitflag = nsdaycalendarunit | nshourcalendarunit | nsminutecalendarunit; nsdatecomponents * Gap = [Cal components: unitflag fromdate: Today todate: todate options: 0]; // calculate the time difference if (ABS ([Gap Day])> 0) {return [nsstring stringwithformat: @ "% d days ago", ABS ([Gap Day])];} else if (ABS ([gap hour])> 0) {return [nsstring stringwithformat: @ "% d Hours Ago", ABS ([gap hour])];} else {return [nsstring stringwithformat: @ "% D Minutes Ago", ABS ([gap minute])];}

4. Calculate the number of words in a string.

+ (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. Screen and save to album

+ (Uiimage *) saveimagefromview :( uiview *) view {uigraphicsbeginimagecontextwitexceptions (view. bounds. size, yes, view. layer. contentsscale); [view. layer renderincontext: uigraphicsgetcurrentcontext ()]; uiimage * image = encrypt (); uigraphicsendimagecontext (); Return image;} + (void) savephotosalbum :( uiimage *) image {encrypt (image, self, @ selector (Images Avedtophotosalbum: didfinishsavingwitherror: contextinfo :), nil);} + (void) preview :( 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 = @ "Success prompt"; message = @ "successfully saved to phase";} else {Title = @ "Failure prompt"; message = [error description];} uialertview * Alert = [[uialertview alloc] initwithtitle: Title message: Message delegate: Nil cancelbuttontitle: @ "know" otherbuttontitles: Nil]; [alert show]; [alert release];}

5. Obtain the timestamp of this month, this week, and the first day of this quarter.

+ (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. Determine whether to jailbreak

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. Define the macro of the singleton

#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. Network status detection

- (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. add push messages

-(Void) setpushnotification {[[uiapplication sharedapplication] metadata: uiremotenotificationtypealert | uiremotenotiftypetypebadge | uiremotenotiftypetypesound];}-(void) Application :( uiapplication *) Application metadata :( nsdata *) devicetoken {nslog (@ "Get devicetoken: % @", devicetoken);}-(void) Application :( uiapplication *) Application didfailtoregisterforremotenotificationswitherror :( nserror *) error {nslog (@ "failed to get token, error: % @", error );}

10, hexadecimal color to 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];}