iOS常用公共方法_移动开发

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iOS常用公共方法

2017/8/7 12:31:30 SUPER_F 程序员俱乐部我要评论(0)

摘要：1.获取磁盘总空间大小1//磁盘总空间2+(CGFloat)diskOfAllSizeMBytes{3CGFloatsize=0.0;4NSError*error;5NSDictionary*dic=[[NSFileManagerdefaultManager]attributesOfFileSystemForPath:NSHomeDirectory()error:&error];6if(error){7#ifdefDEBUG8NSLog(@"error:%@",error
标签：方法常用 iOS

1. 获取磁盘总空间大小

 1 //磁盘总空间
 2 + (CGFloat)diskOfAllSizeMBytes{
 3     CGFloat size = 0.0;
 4     NSError *error;
 5     NSDictionary *dic = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&error];
 6     if (error) {
 7 #ifdef DEBUG
 8         NSLog(@"error: %@", error.localizedDescription);
 9 #endif
10     }else{
11         NSNumber *number = [dic objectForKey:NSFileSystemSize];
12         size = [number floatValue]/1024/1024;
13     }
14     return size;
15 }

2. 获取磁盘可用空间大小

 1 //磁盘可用空间
 2 + (CGFloat)diskOfFreeSizeMBytes{
 3     CGFloat size = 0.0;
 4     NSError *error;
 5     NSDictionary *dic = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&error];
 6     if (error) {
 7 #ifdef DEBUG
 8         NSLog(@"error: %@", error.localizedDescription);
 9 #endif
10     }else{
11         NSNumber *number = [dic objectForKey:NSFileSystemFreeSize];
12         size = [number floatValue]/1024/1024;
13     }
14     return size;
15 }

3. 获取指定路径下某个文件的大小

1 //获取文件大小
2 + (long long)fileSizeAtPath:(NSString *)filePath{
3     NSFileManager *fileManager = [NSFileManager defaultManager];
4     if (![fileManager fileExistsAtPath:filePath]) return 0;
5     return [[fileManager attributesOfItemAtPath:filePath error:nil] fileSize];
6 }

4. 获取文件夹下所有文件的大小

 1 //获取文件夹下所有文件的大小
 2 + (long long)folderSizeAtPath:(NSString *)folderPath{
 3     NSFileManager *fileManager = [NSFileManager defaultManager];
 4     if (![fileManager fileExistsAtPath:folderPath]) return 0;
 5     NSEnumerator *filesEnumerator = [[fileManager subpathsAtPath:folderPath] objectEnumerator];
 6     NSString *fileName;
 7     long long folerSize = 0;
 8     while ((fileName = [filesEnumerator nextObject]) != nil) {
 9         NSString *filePath = [folderPath stringByAppendingPathComponent:fileName];
10         folerSize += [self fileSizeAtPath:filePath];
11     }
12     return folerSize;
13 }

5. 获取字符串(或汉字)首字母

1 //获取字符串(或汉字)首字母
2 + (NSString *)firstCharacterWithString:(NSString *)string{
3     NSMutableString *str = [NSMutableString stringWithString:string];
4     CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformMandarinLatin, NO);
5     CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformStripDiacritics, NO);
6     NSString *pingyin = [str capitalizedString];
7     return [pingyin substringToIndex:1];
8 }

6. 将字符串数组按照元素首字母顺序进行排序分组

 1 //将字符串数组按照元素首字母顺序进行排序分组
 2 + (NSDictionary *)dictionaryOrderByCharacterWithOriginalArray:(NSArray *)array{
 3     if (array.count == 0) {
 4         return nil;
 5     }
 6     for (id obj in array) {
 7         if (![obj isKindOfClass:[NSString class]]) {
 8             return nil;
 9         }
10     }
11     UILocalizedIndexedCollation *indexedCollation = [UILocalizedIndexedCollation currentCollation];
12     NSMutableArray *objects = [NSMutableArray arrayWithCapacity:indexedCollation.sectionTitles.count];
13     //创建27个分组数组
14     for (int i = 0; i < indexedCollation.sectionTitles.count; i++) {
15         NSMutableArray *obj = [NSMutableArray array];
16         [objects addObject:obj];
17     }
18     NSMutableArray *keys = [NSMutableArray arrayWithCapacity:objects.count];
19     //按字母顺序进行分组
20     NSInteger lastIndex = -1;
21     for (int i = 0; i < array.count; i++) {
22         NSInteger index = [indexedCollation sectionForObject:array[i] collationStringSelector:@selector(uppercaseString)];
23         [[objects objectAtIndex:index] addObject:array[i]];
24         lastIndex = index;
25     }
26     //去掉空数组
27     for (int i = 0; i < objects.count; i++) {
28         NSMutableArray *obj = objects[i];
29         if (obj.count == 0) {
30             [objects removeObject:obj];
31         }
32     }
33     //获取索引字母
34     for (NSMutableArray *obj in objects) {
35         NSString *str = obj[0];
36         NSString *key = [self firstCharacterWithString:str];
37         [keys addObject:key];
38     }
39     NSMutableDictionary *dic = [NSMutableDictionary dictionary];
40     [dic setObject:objects forKey:keys];
41     return dic;
42 }
43 
44 //获取字符串(或汉字)首字母
45 + (NSString *)firstCharacterWithString:(NSString *)string{
46     NSMutableString *str = [NSMutableString stringWithString:string];
47     CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformMandarinLatin, NO);
48     CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformStripDiacritics, NO);
49     NSString *pingyin = [str capitalizedString];
50     return [pingyin substringToIndex:1];
51 }

使用如下:

NSArray *arr = @[@"guangzhou", @"shanghai", @"北京", @"henan", @"hainan"];
NSDictionary *dic = [Utilities dictionaryOrderByCharacterWithOriginalArray:arr];
NSLog(@"\n\ndic: %@", dic);

输出结果如下:

imageView2/2/w/1240" alt="" data-original-src="http://upload-images.jianshu.io/upload_images/1803339-a63d16ad6cccc312.png?imageMogr2/auto-orient/strip%7CimageView2/2">
输出结果

7. 获取当前时间

1 //获取当前时间
2 //format: @"yyyy-MM-dd HH:mm:ss"、@"yyyy年MM月dd日 HH时mm分ss秒"
3 + (NSString *)currentDateWithFormat:(NSString *)format{
4     NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
5     [dateFormatter setDateFormat:format];
6     return [dateFormatter stringFromDate:[NSDate date]];
7 }

8. 计算上次日期距离现在多久, 如 xx 小时前、xx 分钟前等

 1 /**
 2  *  计算上次日期距离现在多久
 3  *
 4  *  @param lastTime    上次日期(需要和格式对应)
 5  *  @param format1     上次日期格式
 6  *  @param currentTime 最近日期(需要和格式对应)
 7  *  @param format2     最近日期格式
 8  *
 9  *  @return xx分钟前、xx小时前、xx天前
10  */
11 + (NSString *)timeIntervalFromLastTime:(NSString *)lastTime
12                         lastTimeFormat:(NSString *)format1
13                          ToCurrentTime:(NSString *)currentTime
14                      currentTimeFormat:(NSString *)format2{
15     //上次时间
16     NSDateFormatter *dateFormatter1 = [[NSDateFormatter alloc]init];
17     dateFormatter1.dateFormat = format1;
18     NSDate *lastDate = [dateFormatter1 dateFromString:lastTime];
19     //当前时间
20     NSDateFormatter *dateFormatter2 = [[NSDateFormatter alloc]init];
21     dateFormatter2.dateFormat = format2;
22     NSDate *currentDate = [dateFormatter2 dateFromString:currentTime];
23     return [Utilities timeIntervalFromLastTime:lastDate ToCurrentTime:currentDate];
24 }
25 
26 + (NSString *)timeIntervalFromLastTime:(NSDate *)lastTime ToCurrentTime:(NSDate *)currentTime{
27     NSTimeZone *timeZone = [NSTimeZone systemTimeZone];
28     //上次时间
29     NSDate *lastDate = [lastTime dateByAddingTimeInterval:[timeZone secondsFromGMTForDate:lastTime]];
30     //当前时间
31     NSDate *currentDate = [currentTime dateByAddingTimeInterval:[timeZone secondsFromGMTForDate:currentTime]];
32     //时间间隔
33     NSInteger intevalTime = [currentDate timeIntervalSinceReferenceDate] - [lastDate timeIntervalSinceReferenceDate];
34 
35     //秒、分、小时、天、月、年
36     NSInteger minutes = intevalTime / 60;
37     NSInteger hours = intevalTime / 60 / 60;
38     NSInteger day = intevalTime / 60 / 60 / 24;
39     NSInteger month = intevalTime / 60 / 60 / 24 / 30;
40     NSInteger yers = intevalTime / 60 / 60 / 24 / 365;
41 
42     if (minutes <= 10) {
43         return  @"刚刚";
44     }else if (minutes < 60){
45         return [NSString stringWithFormat: @"%ld分钟前",(long)minutes];
46     }else if (hours < 24){
47         return [NSString stringWithFormat: @"%ld小时前",(long)hours];
48     }else if (day < 30){
49         return [NSString stringWithFormat: @"%ld天前",(long)day];
50     }else if (month < 12){
51         NSDateFormatter * df =[[NSDateFormatter alloc]init];
52         df.dateFormat = @"M月d日";
53         NSString * time = [df stringFromDate:lastDate];
54         return time;
55     }else if (yers >= 1){
56         NSDateFormatter * df =[[NSDateFormatter alloc]init];
57         df.dateFormat = @"yyyy年M月d日";
58         NSString * time = [df stringFromDate:lastDate];
59         return time;
60     }
61     return @"";
62 }

使用如下:

NSLog(@"\n\nresult: %@", [Utilities timeIntervalFromLastTime:@"2015年12月8日 15:50"
                                           lastTimeFormat:@"yyyy年MM月dd日 HH:mm"
                                            ToCurrentTime:@"2015/12/08 16:12"
                                        currentTimeFormat:@"yyyy/MM/dd HH:mm"]);

输出结果如下:

输出结果

9. 判断手机号码格式是否正确

 1 //判断手机号码格式是否正确
 2 + (BOOL)valiMobile:(NSString *)mobile{
 3     mobile = [mobile stringByReplacingOccurrencesOfString:@" " withString:@""];
 4     if (mobile.length != 11)
 5     {
 6         return NO;
 7     }else{
 8         /**
 9          * 移动号段正则表达式
10          */
11         NSString *CM_NUM = @"^((13[4-9])|(147)|(15[0-2,7-9])|(178)|(18[2-4,7-8]))\\d{8}|(1705)\\d{7}$";
12         /**
13          * 联通号段正则表达式
14          */
15         NSString *CU_NUM = @"^((13[0-2])|(145)|(15[5-6])|(176)|(18[5,6]))\\d{8}|(1709)\\d{7}$";
16         /**
17          * 电信号段正则表达式
18          */
19         NSString *CT_NUM = @"^((133)|(153)|(177)|(18[0,1,9]))\\d{8}$";
20         NSPredicate *pred1 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM_NUM];
21         BOOL isMatch1 = [pred1 evaluateWithObject:mobile];
22         NSPredicate *pred2 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU_NUM];
23         BOOL isMatch2 = [pred2 evaluateWithObject:mobile];
24         NSPredicate *pred3 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT_NUM];
25         BOOL isMatch3 = [pred3 evaluateWithObject:mobile];
26 
27         if (isMatch1 || isMatch2 || isMatch3) {
28             return YES;
29         }else{
30             return NO;
31         }
32     }
33 }

10. 判断邮箱格式是否正确

1 //利用正则表达式验证
2 + (BOOL)isAvailableEmail:(NSString *)email {
3     NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
4     NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
5     return [emailTest evaluateWithObject:email];
6 }

11. 将十六进制颜色转换为 UIColor 对象

 1 //将十六进制颜色转换为 UIColor 对象
 2 + (UIColor *)colorWithHexString:(NSString *)color{
 3     NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
 4     // String should be 6 or 8 characters
 5     if ([cString length] < 6) {
 6         return [UIColor clearColor];
 7     }
 8     // strip "0X" or "#" if it appears
 9     if ([cString hasPrefix:@"0X"])
10         cString = [cString substringFromIndex:2];
11     if ([cString hasPrefix:@"#"])
12         cString = [cString substringFromIndex:1];
13     if ([cString length] != 6)
14         return [UIColor clearColor];
15     // Separate into r, g, b substrings
16     NSRange range;
17     range.location = 0;
18     range.length = 2;
19     //r
20     NSString *rString = [cString substringWithRange:range];
21     //g
22     range.location = 2;
23     NSString *gString = [cString substringWithRange:range];
24     //b
25     range.location = 4;
26     NSString *bString = [cString substringWithRange:range];
27     // Scan values
28     unsigned int r, g, b;
29     [[NSScanner scannerWithString:rString] scanHexInt:&r];
30     [[NSScanner scannerWithString:gString] scanHexInt:&g];
31     [[NSScanner scannerWithString:bString] scanHexInt:&b];
32     return [UIColor colorWithRed:((float) r / 255.0f) green:((float) g / 255.0f) blue:((float) b / 255.0f) alpha:1.0f];
33 }

12. 对图片进行滤镜处理

 1 #pragma mark - 对图片进行滤镜处理
 2 // 怀旧 --> CIPhotoEffectInstant                         单色 --> CIPhotoEffectMono
 3 // 黑白 --> CIPhotoEffectNoir                            褪色 --> CIPhotoEffectFade
 4 // 色调 --> CIPhotoEffectTonal                           冲印 --> CIPhotoEffectProcess
 5 // 岁月 --> CIPhotoEffectTransfer                        铬黄 --> CIPhotoEffectChrome
 6 // CILinearToSRGBToneCurve, CISRGBToneCurveToLinear, CIGaussianBlur, CIBoxBlur, CIDiscBlur, CISepiaTone, CIDepthOfField
 7 + (UIImage *)filterWithOriginalImage:(UIImage *)image filterName:(NSString *)name{
 8     CIContext *context = [CIContext contextWithOptions:nil];
 9     CIImage *inputImage = [[CIImage alloc] initWithImage:image];
10     CIFilter *filter = [CIFilter filterWithName:name];
11     [filter setValue:inputImage forKey:kCIInputImageKey];
12     CIImage *result = [filter valueForKey:kCIOutputImageKey];
13     CGImageRef cgImage = [context createCGImage:result fromRect:[result extent]];
14     UIImage *resultImage = [UIImage imageWithCGImage:cgImage];
15     CGImageRelease(cgImage);
16     return resultImage;
17 }

13. 对图片进行模糊处理

 1 #pragma mark - 对图片进行模糊处理
 2 // CIGaussianBlur ---> 高斯模糊
 3 // CIBoxBlur      ---> 均值模糊(Available in iOS 9.0 and later)
 4 // CIDiscBlur     ---> 环形卷积模糊(Available in iOS 9.0 and later)
 5 // CIMedianFilter ---> 中值模糊, 用于消除图像噪点, 无需设置radius(Available in iOS 9.0 and later)
 6 // CIMotionBlur   ---> 运动模糊, 用于模拟相机移动拍摄时的扫尾效果(Available in iOS 9.0 and later)
 7 + (UIImage *)blurWithOriginalImage:(UIImage *)image blurName:(NSString *)name radius:(NSInteger)radius{
 8     CIContext *context = [CIContext contextWithOptions:nil];
 9     CIImage *inputImage = [[CIImage alloc] initWithImage:image];
10     CIFilter *filter;
11     if (name.length != 0) {
12         filter = [CIFilter filterWithName:name];
13         [filter setValue:inputImage forKey:kCIInputImageKey];
14         if (![name isEqualToString:@"CIMedianFilter"]) {
15             [filter setValue:@(radius) forKey:@"inputRadius"];
16         }
17         CIImage *result = [filter valueForKey:kCIOutputImageKey];
18         CGImageRef cgImage = [context createCGImage:result fromRect:[result extent]];
19         UIImage *resultImage = [UIImage imageWithCGImage:cgImage];
20         CGImageRelease(cgImage);
21         return resultImage;
22     }else{
23         return nil;
24     }
25 }

14. 调整图片饱和度、亮度、对比度

 1 /**
 2  *  调整图片饱和度, 亮度, 对比度
 3  *
 4  *  @param image      目标图片
 5  *  @param saturation 饱和度
 6  *  @param brightness 亮度: -1.0 ~ 1.0
 7  *  @param contrast   对比度
 8  *
 9  */
10 + (UIImage *)colorControlsWithOriginalImage:(UIImage *)image
11                                  saturation:(CGFloat)saturation
12                                  brightness:(CGFloat)brightness
13                                    contrast:(CGFloat)contrast{
14     CIContext *context = [CIContext contextWithOptions:nil];
15     CIImage *inputImage = [[CIImage alloc] initWithImage:image];
16     CIFilter *filter = [CIFilter filterWithName:@"CIColorControls"];
17     [filter setValue:inputImage forKey:kCIInputImageKey];
18 
19     [filter setValue:@(saturation) forKey:@"inputSaturation"];
20     [filter setValue:@(brightness) forKey:@"inputBrightness"];
21     [filter setValue:@(contrast) forKey:@"inputContrast"];
22 
23     CIImage *result = [filter valueForKey:kCIOutputImageKey];
24     CGImageRef cgImage = [context createCGImage:result fromRect:[result extent]];
25     UIImage *resultImage = [UIImage imageWithCGImage:cgImage];
26     CGImageRelease(cgImage);
27     return resultImage;
28 }

15. 创建一张实时模糊效果 View (毛玻璃效果)

1 //Avilable in iOS 8.0 and later
2 + (UIVisualEffectView *)effectViewWithFrame:(CGRect)frame{
3     UIBlurEffect *effect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
4     UIVisualEffectView *effectView = [[UIVisualEffectView alloc] initWithEffect:effect];
5     effectView.frame = frame;
6     return effectView;
7 }

16. 全屏截图

1 //全屏截图
2 + (UIImage *)shotScreen{
3     UIWindow *window = [UIApplication sharedApplication].keyWindow;
4     UIGraphicsBeginImageContext(window.bounds.size);
5     [window.layer renderInContext:UIGraphicsGetCurrentContext()];
6     UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
7     UIGraphicsEndImageContext();
8     return image;
9 }

17. 截取一张 view 生成图片

1 //截取view生成一张图片
2 + (UIImage *)shotWithView:(UIView *)view{
3     UIGraphicsBeginImageContext(view.bounds.size);
4     [view.layer renderInContext:UIGraphicsGetCurrentContext()];
5     UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
6     UIGraphicsEndImageContext();
7     return image;
8 }

18. 截取view中某个区域生成一张图片

 1 //截取view中某个区域生成一张图片
 2 + (UIImage *)shotWithView:(UIView *)view scope:(CGRect)scope{
 3     CGImageRef imageRef = CGImageCreateWithImageInRect([self shotWithView:view].CGImage, scope);
 4     UIGraphicsBeginImageContext(scope.size);
 5     CGContextRef context = UIGraphicsGetCurrentContext();
 6     CGRect rect = CGRectMake(0, 0, scope.size.width, scope.size.height);
 7     CGContextTranslateCTM(context, 0, rect.size.height);//下移
 8     CGContextScaleCTM(context, 1.0f, -1.0f);//上翻
 9     CGContextDrawImage(context, rect, imageRef);
10     UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
11     UIGraphicsEndImageContext();
12     CGImageRelease(imageRef);
13     CGContextRelease(context);
14     return image;
15 }

19. 压缩图片到指定尺寸大小

1 //压缩图片到指定尺寸大小
2 + (UIImage *)compressOriginalImage:(UIImage *)image toSize:(CGSize)size{
3     UIImage *resultImage = image;
4     UIGraphicsBeginImageContext(size);
5     [resultImage drawInRect:CGRectMake(0, 0, size.width, size.height)];
6     UIGraphicsEndImageContext();
7     return resultImage;
8 }

20. 压缩图片到指定文件大小

 1 //压缩图片到指定文件大小
 2 + (NSData *)compressOriginalImage:(UIImage *)image toMaxDataSizeKBytes:(CGFloat)size{
 3     NSData *data = UIImageJPEGRepresentation(image, 1.0);
 4     CGFloat dataKBytes = data.length/1000.0;
 5     CGFloat maxQuality = 0.9f;
 6     CGFloat lastData = dataKBytes;
 7     while (dataKBytes > size && maxQuality > 0.01f) {
 8         maxQuality = maxQuality - 0.01f;
 9         data = UIImageJPEGRepresentation(image, maxQuality);
10         dataKBytes = data.length/1000.0;
11         if (lastData == dataKBytes) {
12             break;
13         }else{
14             lastData = dataKBytes;
15         }
16     }
17     return data;
18 }

21. 获取设备 IP 地址

 1 需要先引入下头文件:
 2 
 3 #import <ifaddrs.h>
 4 #import <arpa/inet.h>
 5 代码:
 6 
 7 //获取设备 IP 地址
 8 + (NSString *)getIPAddress {
 9     NSString *address = @"error";
10     struct ifaddrs *interfaces = NULL;
11     struct ifaddrs *temp_addr = NULL;
12     int success = 0;
13     success = getifaddrs(&interfaces);
14     if (success == 0) {
15         temp_addr = interfaces;
16         while(temp_addr != NULL) {
17             if(temp_addr->ifa_addr->sa_family == AF_INET) {
18                 if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
19                     address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
20                 }
21             }
22             temp_addr = temp_addr->ifa_next;
23         }
24     }
25     freeifaddrs(interfaces);
26     return address;
27 }

22. 判断字符串中是否含有空格

1 + (BOOL)isHaveSpaceInString:(NSString *)string{
2     NSRange _range = [string rangeOfString:@" "];
3     if (_range.location != NSNotFound) {
4         return YES;
5     }else {
6         return NO;
7     }
8 }

23. 判断字符串中是否含有某个字符串

1 + (BOOL)isHaveString:(NSString *)string1 InString:(NSString *)string2{
2     NSRange _range = [string2 rangeOfString:string1];
3     if (_range.location != NSNotFound) {
4         return YES;
5     }else {
6         return NO;
7     }
8 }

24. 判断字符串中是否含有中文

1 + (BOOL)isHaveChineseInString:(NSString *)string{
2     for(NSInteger i = 0; i < [string length]; i++){
3         int a = [string characterAtIndex:i];
4         if (a > 0x4e00 && a < 0x9fff) {
5             return YES;
6         }
7     }
8     return NO;
9 }

25. 判断字符串是否全部为数字

 1 + (BOOL)isAllNum:(NSString *)string{
 2     unichar c;
 3     for (int i=0; i<string.length; i++) {
 4         c=[string characterAtIndex:i];
 5         if (!isdigit(c)) {
 6             return NO;
 7         }
 8     }
 9     return YES;
10 }

26. 绘制虚线

 1 /*
 2   ** lineFrame:     虚线的 frame
 3   ** length:        虚线中短线的宽度
 4   ** spacing:       虚线中短线之间的间距
 5   ** color:         虚线中短线的颜色
 6 */
 7 + (UIView *)createDashedLineWithFrame:(CGRect)lineFrame
 8                            lineLength:(int)length
 9                           lineSpacing:(int)spacing
10                             lineColor:(UIColor *)color{
11     UIView *dashedLine = [[UIView alloc] initWithFrame:lineFrame];
12     dashedLine.backgroundColor = [UIColor clearColor];
13     CAShapeLayer *shapeLayer = [CAShapeLayer layer];
14     [shapeLayer setBounds:dashedLine.bounds];
15     [shapeLayer setPosition:CGPointMake(CGRectGetWidth(dashedLine.frame) / 2, CGRectGetHeight(dashedLine.frame))];
16     [shapeLayer setFillColor:[UIColor clearColor].CGColor];
17     [shapeLayer setStrokeColor:color.CGColor];
18     [shapeLayer setLineWidth:CGRectGetHeight(dashedLine.frame)];
19     [shapeLayer setLineJoin:kCALineJoinRound];
20     [shapeLayer setLineDashPattern:[NSArray arrayWithObjects:[NSNumber numberWithInt:length], [NSNumber numberWithInt:spacing], nil]];
21     CGMutablePathRef path = CGPathCreateMutable();
22     CGPathMoveToPoint(path, NULL, 0, 0);
23     CGPathAddLineToPoint(path, NULL, CGRectGetWidth(dashedLine.frame), 0);
24     [shapeLayer setPath:path];
25     CGPathRelease(path);
26     [dashedLine.layer addSublayer:shapeLayer];
27     return dashedLine;
28 }

27. 将字典对象转换为 JSON 字符串

 1 + (NSString *)jsonPrettyStringEncoded:(NSDictionary *)dictionary{
 2     if ([NSJSONSerialization isValidJSONObject:dictionary ]) {
 3         NSError *error;
 4         NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dictionary options:NSJSONWritingPrettyPrinted error:&error];
 5         if (!error) {
 6             NSString *json = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
 7             return json;
 8         }
 9     }
10     return nil;
11 }

28.将数组对象转换为 JSON 字符串

 1 + (NSString *)jsonPrettyStringEncoded:(NSArray *)array{
 2     if ([NSJSONSerialization isValidJSONObject:array]) {
 3         NSError *error;
 4         NSData *jsonData = [NSJSONSerialization dataWithJSONObject:array options:NSJSONWritingPrettyPrinted error:&error];
 5         if (!error) {
 6             NSString *json = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
 7             return json;
 8         }
 9     }
10     return nil;
11 }

29. 获取 WiFi 信息

 1 需要引入头文件:
 2 
 3 #import <SystemConfiguration/CaptiveNetwork.h>
 4 代码:
 5 
 6 //获取 WiFi 信息
 7 - (NSDictionary *)fetchSSIDInfo {
 8     NSArray *ifs = (__bridge_transfer NSArray *)CNCopySupportedInterfaces();
 9     if (!ifs) {
10         return nil;
11     }
12     NSDictionary *info = nil;
13     for (NSString *ifnam in ifs) {
14         info = (__bridge_transfer NSDictionary *)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifnam);
15         if (info && [info count]) { break; }
16     }
17     return info;
18 }

30. 获取广播地址、本机地址、子网掩码、端口信息

 1 需要引入头文件:
 2 
 3 p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 14.0px Menlo; color: #ff4647}span.s1 {font-variant-ligatures: no-common-ligatures; color: #eb905a}span.s2 {font-variant-ligatures: no-common-ligatures}
 4 
 5 #import <ifaddrs.h>
 6 #import <arpa/inet.h>
 7 //获取广播地址、本机地址、子网掩码、端口信息
 8 - (NSMutableDictionary *)getLocalInfoForCurrentWiFi {
 9     NSMutableDictionary *dict = [NSMutableDictionary dictionary];
10     struct ifaddrs *interfaces = NULL;
11     struct ifaddrs *temp_addr = NULL;
12     int success = 0;
13     // retrieve the current interfaces - returns 0 on success
14     success = getifaddrs(&interfaces);
15     if (success == 0) {
16         // Loop through linked list of interfaces
17         temp_addr = interfaces;
18         //*/
19         while(temp_addr != NULL) {
20             if(temp_addr->ifa_addr->sa_family == AF_INET) {
21                 // Check if interface is en0 which is the wifi connection on the iPhone
22                 if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
23                     //广播地址
24                     NSString *broadcast = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_dstaddr)->sin_addr)];
25                     if (broadcast) {
26                         [dict setObject:broadcast forKey:@"broadcast"];
27                     }
28 //                    NSLog(@"broadcast address--%@",broadcast);
29                     //本机地址
30                     NSString *localIp = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
31                     if (localIp) {
32                         [dict setObject:localIp forKey:@"localIp"];
33                     }
34 //                    NSLog(@"local device ip--%@",localIp);
35                     //子网掩码地址
36                     NSString *netmask = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_netmask)->sin_addr)];
37                     if (netmask) {
38                         [dict setObject:netmask forKey:@"netmask"];
39                     }
40 //                    NSLog(@"netmask--%@",netmask);
41                     //--en0 端口地址
42                     NSString *interface = [NSString stringWithUTF8String:temp_addr->ifa_name];
43                     if (interface) {
44                         [dict setObject:interface forKey:@"interface"];
45                     }
46 //                    NSLog(@"interface--%@",interface);
47                     return dict;
48                 }
49             }
50             temp_addr = temp_addr->ifa_next;
51         }
52     }
53     // Free memory
54     freeifaddrs(interfaces);
55     return dict;
56 }