iOS -一些常用的方法

1、获取本地的语言

1. + (NSString *)getLocalLanguage
2. {
3. NSString *language = [[[NSUserDefaults standardUserDefaults] objectForKey:@"AppleLanguages"] objectAtIndex:0];
4. return language;
5. }

2、获取Mac地址

1. // returns the local MAC address.
2. + (NSString*) macAddress:(NSString*)interfaceNameOrNil
3. {
4. // uses en0 as the default interface name
5. NSString* interfaceName = interfaceNameOrNil;
6. if (interfaceName == nil)
7. {
8. interfaceName = @"en0";
9. }
10. int                 mib[6];
11. size_t              len;
12. char                *buf;
13. unsigned char       *ptr;
14. struct if_msghdr    *ifm;
15. struct sockaddr_dl  *sdl;
16. mib[0] = CTL_NET;
17. mib[1] = AF_ROUTE;
18. mib[2] = 0;
19. mib[3] = AF_LINK;
20. mib[4] = NET_RT_IFLIST;
21. if ((mib[5] = if_nametoindex([interfaceName UTF8String])) == 0)
22. {
23. printf("Error: if_nametoindex error\n");
24. return NULL;
25. }
26. if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
27. {
28. printf("Error: sysctl, take 1\n");
29. return NULL;
30. }
31. if ((buf = malloc(len)) == NULL)
32. {
33. printf("Could not allocate memory. error!\n");
34. return NULL;
35. }
36. if (sysctl(mib, 6, buf, &len, NULL, 0) < 0)
37. {
38. printf("Error: sysctl, take 2");
39. free(buf);
40. return NULL;
41. }
42. ifm = (struct if_msghdr*) buf;
43. sdl = (struct sockaddr_dl*) (ifm + 1);
44. ptr = (unsigned char*) LLADDR(sdl);
45. NSString *outstring = [NSString stringWithFormat:@"%02X:%02X:%02X:%02X:%02X:%02X",
46. *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];
47. free(buf);
48. return outstring;
49. }

3、微博中获取时间差，（几天前，几小时前，几分钟前）

1. + (NSString *) getTimeDiffString:(NSTimeInterval) timestamp
2. {
3. NSCalendar *cal = [NSCalendar currentCalendar];
4. NSDate *todate = [NSDate dateWithTimeIntervalSince1970:timestamp];
5. NSDate *today = [NSDate date];//当前时间
6. unsigned int unitFlag = NSDayCalendarUnit | NSHourCalendarUnit |NSMinuteCalendarUnit;
7. NSDateComponents *gap = [cal components:unitFlag fromDate:today toDate:todate options:0];//计算时间差
8. if (ABS([gap day]) > 0)
9. {
10. return [NSString stringWithFormat:@"%d天前", ABS([gap day])];
11. }else if(ABS([gap hour]) > 0)
12. {
13. return [NSString stringWithFormat:@"%d小时前", ABS([gap hour])];
14. }else
15. {
16. return [NSString stringWithFormat:@"%d分钟前",  ABS([gap minute])];
17. }
18. }

4、计算字符串中单词的个数

1. + (int)countWords:(NSString*)s
2. {
3. int i,n=[s length],l=0,a=0,b=0;
4. unichar c;
5. for(i=0;i<n;i++){
6. c=[s characterAtIndex:i];
7. if(isblank(c))
8. {
9. b++;
10. }else if(isascii(c))
11. {
12. a++;
13. }else
14. {
15. l++;
16. }
17. }
18. if(a==0 && l==0)
19. {
20. return 0;
21. }
22. return l+(int)ceilf((float)(a+b)/2.0);
23. }

5、屏幕截图并保存到相册

1. + (UIImage*)saveImageFromView:(UIView*)view
2. {
3. UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, view.layer.contentsScale);
4. [view.layer renderInContext:UIGraphicsGetCurrentContext()];
5. UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
6. UIGraphicsEndImageContext();
7. return image;
8. }
9. + (void)savePhotosAlbum:(UIImage *)image
10. {
11. UIImageWriteToSavedPhotosAlbum(image, self, @selector(imageSavedToPhotosAlbum: didFinishSavingWithError: contextInfo:), nil);
12. }
13. + (void)saveImageFromToPhotosAlbum:(UIView*)view
14. {
15. UIImage *image = [self saveImageFromView:view];
16. [self savePhotosAlbum:image];
17. }
18. - (void)imageSavedToPhotosAlbum:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *) contextInfo
19. {
20. NSString *message;
21. NSString *title;
22. if (!error) {
23. title = @"成功提示";
24. message = @"成功保存到相";
25. } else {
26. title = @"失败提示";
27. message = [error description];
28. }
29. UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title
30. message:message
31. delegate:nil
32. cancelButtonTitle:@"知道了"
33. otherButtonTitles:nil];
34. [alert show];
35. [alert release];
36. }

5、获取本月，本周，本季度第一天的时间戳

1. + (unsigned long long)getFirstDayOfWeek:(unsigned long long)timestamp
2. {
3. NSDate *now = [NSDate dateWithTimeIntervalSince1970:timestamp];
4. NSCalendar *cal = [NSCalendar currentCalendar];
5. NSDateComponents *comps = [cal
6. components:NSYearCalendarUnit| NSMonthCalendarUnit| NSWeekCalendarUnit | NSWeekdayCalendarUnit |NSWeekdayOrdinalCalendarUnit
7. fromDate:now];
8. if (comps.weekday <2)
9. {
10. comps.week = comps.week-1;
11. }
12. comps.weekday = 2;
13. NSDate *firstDay = [cal dateFromComponents:comps];
14. return [firstDay timeIntervalSince1970];
15. }
16. + (unsigned long long)getFirstDayOfQuarter:(unsigned long long)timestamp
17. {
18. NSDate *now = [NSDate dateWithTimeIntervalSince1970:timestamp];
19. NSCalendar *cal = [NSCalendar currentCalendar];
20. NSDateComponents *comps = [cal
21. components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit
22. fromDate:now];
23. if (comps.month <=3)
24. {
25. comps.month =  1;
26. }
27. else if(comps.month<=6)
28. {
29. comps.month =  4;
30. }
31. else if(comps.month<=9)
32. {
33. comps.month =  7;
34. }
35. else if(comps.month<=12)
36. {
37. comps.month =  10;
38. }
39. comps.day = 1;
40. NSDate *firstDay = [cal dateFromComponents:comps];
41. return [firstDay timeIntervalSince1970]*1000;
42. }
43. + (unsigned long long)getFirstDayOfMonth:(unsigned long long)timestamp
44. {
45. NSDate *now = [NSDate dateWithTimeIntervalSince1970:timestamp/1000];
46. NSCalendar *cal = [NSCalendar currentCalendar];
47. NSDateComponents *comps = [cal
48. components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit
49. fromDate:now];
50. comps.day = 1;
51. NSDate *firstDay = [cal dateFromComponents:comps];
52. return [firstDay timeIntervalSince1970]*1000;
53. }

6、判断是否越狱

1. static const char * __jb_app = NULL;
2. + (BOOL)isJailBroken
3. {
4. static const char * __jb_apps[] =
5. {
6. "/Application/Cydia.app",
7. "/Application/limera1n.app",
8. "/Application/greenpois0n.app",
9. "/Application/blackra1n.app",
10. "/Application/blacksn0w.app",
11. "/Application/redsn0w.app",
12. NULL
13. };
14. __jb_app = NULL;
15. // method 1
16. for ( int i = 0; __jb_apps[i]; ++i )
17. {
18. if ( [[NSFileManager defaultManager] fileExistsAtPath:[NSString stringWithUTF8String:__jb_apps[i]]] )
19. {
20. __jb_app = __jb_apps[i];
21. return YES;
22. }
23. }
24. // method 2
25. if ( [[NSFileManager defaultManager] fileExistsAtPath:@"/private/var/lib/apt/"] )
26. {
27. return YES;
28. }
29. // method 3
30. if ( 0 == system("ls") )
31. {
32. return YES;
33. }
34. return NO;
35. }
36. + (NSString *)jailBreaker
37. {
38. if ( __jb_app )
39. {
40. return [NSString stringWithUTF8String:__jb_app];
41. }
42. else
43. {
44. return @"";
45. }
46. }

7、定义单例的宏

1. #undef  AS_SINGLETON
2. #define AS_SINGLETON( __class ) \
3. + (__class *)sharedInstance;
4. #undef  DEF_SINGLETON
5. #define DEF_SINGLETON( __class ) \
6. + (__class *)sharedInstance \
7. { \
8. static dispatch_once_t once; \
9. static __class * __singleton__; \
10. dispatch_once( &once, ^{ __singleton__ = [[__class alloc] init]; } ); \
11. return __singleton__; \
12. }

8、网络状态检测

1. - (void)reachabilityChanged:(NSNotification *)note {
2. Reachability* curReach = [note object];
3. NSParameterAssert([curReach isKindOfClass: [Reachability class]]);
4. NetworkStatus status = [curReach currentReachabilityStatus];
5. if (status == NotReachable)
6. {
7. }
8. else if(status == kReachableViaWiFi)
9. {
10. }
11. else if(status == kReachableViaWWAN)
12. {
13. }
14. }
15. - (void)setNetworkNotification
16. {
17. [[NSNotificationCenter defaultCenter] addObserver:self
18. selector:@selector(reachabilityChanged:)
19. name: kReachabilityChangedNotification
20. object: nil];
21. _hostReach = [[Reachability reachabilityWithHostName:@"http://www.baidu.com"] retain];
22. [_hostReach startNotifier];
23. }

9、添加推送消息

1. - (void)setPushNotification
2. {
3. [[UIApplication sharedApplication] registerForRemoteNotificationTypes:UIRemoteNotificationTypeAlert|UIRemoteNotificationTypeBadge|UIRemoteNotificationTypeSound];
4. }
5. - (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
6. NSLog(@"获取设备的deviceToken: %@", deviceToken);
7. }
8. - (void)application:(UIApplication*)application didFailToRegisterForRemoteNotificationsWithError:(NSError*)error{
9. NSLog(@"Failed to get token, error: %@", error);
10. }

10、16进制颜色转UIColor

1. + (UIColor *)colorWithHex:(NSString *)hex {
2. // Remove `#` and `0x`
3. if ([hex hasPrefix:@"#"]) {
4. hex = [hex substringFromIndex:1];
5. } else if ([hex hasPrefix:@"0x"]) {
6. hex = [hex substringFromIndex:2];
7. }
8. // Invalid if not 3, 6, or 8 characters
9. NSUInteger length = [hex length];
10. if (length != 3 && length != 6 && length != 8) {
11. return nil;
12. }
13. // Make the string 8 characters long for easier parsing
14. if (length == 3) {
15. NSString *r = [hex substringWithRange:NSMakeRange(0, 1)];
16. NSString *g = [hex substringWithRange:NSMakeRange(1, 1)];
17. NSString *b = [hex substringWithRange:NSMakeRange(2, 1)];
18. hex = [NSString stringWithFormat:@"%@%@%@%@%@%@ff",
19. r, r, g, g, b, b];
20. } else if (length == 6) {
21. hex = [hex stringByAppendingString:@"ff"];
22. }
23. CGFloat red = [[hex substringWithRange:NSMakeRange(0, 2)] _hexValue] / 255.0f;
24. CGFloat green = [[hex substringWithRange:NSMakeRange(2, 2)] _hexValue] / 255.0f;
25. CGFloat blue = [[hex substringWithRange:NSMakeRange(4, 2)] _hexValue] / 255.0f;
26. CGFloat alpha = [[hex substringWithRange:NSMakeRange(6, 2)] _hexValue] / 255.0f;
27. return [UIColor colorWithRed:red green:green blue:blue alpha:alpha];
28. }