iOS开发常用方法

  • 获取本地化语言
NSString *language = [[[NSUserDefaults standardUserDefaults] objectForKey:@"AppleLanguages"] objectAtIndex:0]; 
  • MD5
#import <CommonCrypto/CommonDigest.h>
- (NSString *)md5
{
    const char *cStr = [self UTF8String];
    unsigned char result[16];
    CC_MD5(cStr, (CC_LONG)strlen(cStr), result);
    return [NSString stringWithFormat:
           @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
            result[0], result[1], result[2], result[3], 
            result[4], result[5], result[6], result[7],
            result[8], result[9], result[10], result[11],
            result[12], result[13], result[14], result[15]
    ];
}
  • 获取mac地址
- (NSString *)getMacAddress {
    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("en0")) == 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) {
        free(buf);
        printf("Error: sysctl, take 2");
        return NULL;
    }

    ifm = (struct if_msghdr *)buf;
    sdl = (struct sockaddr_dl *)(ifm + 1);
    ptr = (unsigned char *)LLADDR(sdl);

    // MAC地址带冒号
    // NSString *outstring = [NSString stringWithFormat:@"%02x:%02x:%02x:%02x:%02x:%02x", *ptr, *(ptr+1), *(ptr+2),
    // *(ptr+3), *(ptr+4), *(ptr+5)];

    // MAC地址不带冒号
    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 uppercaseString];
}
  • 获取时间差
+ (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])];  
    }  
}  
  • 计算字符串中单词的个数
+ (int)stringWordsCount:(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);  
}  
  • 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];  
}  
  • 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;  
}  
  • 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 @"";  
    }  
}  
  • 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__; \  
        }  
  • 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];  
}
  • 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);  
}  
  • 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];  
}  
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