iOS 关于NSString的部分扩展 部分总结

类目:非正式协议(类目名)对一个类(原有类-什么都没有)方法的扩展（注:只允许添加方法不允许添加变量）

        1、命名规则:类名+类目的名称(要扩展的哪一个方向)

        2、什么时候使用类目

             ①、团队开发同一个任务(同一个类),又想不互相影响->就可以使用类目

            ②、扩展系统类里面的方法->OC是不开源的不能修改原有类的.m文件增加方法实现->使用类目

      3、调用的时候使用原有类去调用(类方法-原有类的类名调用)(对象方法-原有类的对象调用)

      4、创建一个类目-> command+N ->object-c file -> category ->第一个输入内容:类目的名字第二个输入的内容:要扩展的类

   

// 判断是否是 emoji表情
- (BOOL)isEmoji {
    BOOL returnValue = NO;

    const unichar hs = [self characterAtIndex:0];
    // surrogate pair
    if (0xd800 <= hs && hs <= 0xdbff) {
        if (self.length > 1) {
            const unichar ls = [self characterAtIndex:1];
            const int uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;
            if (0x1d000 <= uc && uc <= 0x1f77f) {
                returnValue = YES;
            }
        }
    } else if (self.length > 1) {
        const unichar ls = [self characterAtIndex:1];
        if (ls == 0x20e3) {
            returnValue = YES;
        }
    } else {
        // non surrogate
        if (0x2100 <= hs && hs <= 0x27ff) {
            returnValue = YES;
        } else if (0x2B05 <= hs && hs <= 0x2b07) {
            returnValue = YES;
        } else if (0x2934 <= hs && hs <= 0x2935) {
            returnValue = YES;
        } else if (0x3297 <= hs && hs <= 0x3299) {
            returnValue = YES;
        } else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50) {
            returnValue = YES;
        }
    }

    return returnValue;
}

/**
 *  得到文字和字体就能计算文字尺寸
 *
 *  @param text    需要计算尺寸的文字
 *  @param font    文字的字体
 *  @param maxW     最大的宽度
 *
 *  @return
 */
- (CGSize)sizeWithFont:(UIFont *)font maxW:(CGFloat)maxW {
    NSMutableDictionary *attrs = [NSMutableDictionary dictionary];
    attrs[NSFontAttributeName] = font;
    CGSize maxSize = CGSizeMake(maxW, MAXFLOAT);

    NSLog(@"IOS7以上的系统");
    return [self boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:attrs context:nil].size;
}

- (CGSize)sizeWithFont:(UIFont *)font {
    return [self sizeWithFont:font maxW:MAXFLOAT];
}

//适合的高度 默认 systemFontOfSize:font
- (CGFloat)heightWithFont:(NSInteger)font w:(CGFloat)w {
    return [self boundingRectWithSize:CGSizeMake(w, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{ NSFontAttributeName : [UIFont systemFontOfSize:font] } context:nil].size.height;
}

//适合的宽度 默认 systemFontOfSize:font
- (CGFloat)widthWithFont:(NSInteger)font h:(CGFloat)h {
    return [self boundingRectWithSize:CGSizeMake(MAXFLOAT, h) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{ NSFontAttributeName : [UIFont systemFontOfSize:font] } context:nil].size.width;
}

//去空格
- (NSString *)delSpace {
    return [self stringByReplacingOccurrencesOfString:@" " withString:@""];
}
//去空格
- (NSString *)delBlank {
    return [self stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
}

//转为 base64string后的Data
- (NSData *)base64Data {
    return [[NSData alloc] initWithBase64EncodedString:self options:0];
}
// 转为 base64String
- (NSString *)base64Str {
    return [[self dataUsingEncoding:NSUTF8StringEncoding] base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithLineFeed];
}
//解 base64为Str 解不了就返回原始的数值
- (NSString *)decodeBase64 {
    NSString *WillDecode = [[NSString alloc] initWithData:[[NSData alloc] initWithBase64EncodedString:self options:0] encoding:NSUTF8StringEncoding];
    return (WillDecode.length != 0) ? WillDecode : self;
}

//按字符串的，逗号分割为数组
- (NSArray *)combinArr {
    if ([self hasSuffix:@","]) {
        return [[self substringToIndex:self.length - 1] componentsSeparatedByString:@","];
    }
    return [self componentsSeparatedByString:@","];
}

//是否包含对应字符
- (BOOL)containStr:(NSString *)subString {
    return ([self rangeOfString:subString].location == NSNotFound) ? NO : YES;
}

//拼上字符串
- (NSString *)addStr:(NSString *)string {
    if (!string || string.length == 0) {
        return self;
    }
    return [self stringByAppendingString:string];
}
- (NSString *)addInt:(int)string {
    return [self stringByAppendingString:@(string).stringValue];
}

//32位MD5加密
- (NSString *)MD5 {
    const char *cStr = [self UTF8String];
    unsigned char digest[CC_MD5_DIGEST_LENGTH];
    CC_MD5(cStr, (CC_LONG) strlen(cStr), digest);
    NSMutableString *result = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
    for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {
        [result appendFormat:@"%02x", digest[i]];
    }
    return [result copy];
}

//SHA1加密
- (NSString *)SHA1 {
    const char *cStr = [self UTF8String];
    NSData *data = [NSData dataWithBytes:cStr length:self.length];
    uint8_t digest[CC_SHA1_DIGEST_LENGTH];
    CC_SHA1(data.bytes, (CC_LONG) data.length, digest);
    NSMutableString *result = [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH * 2];
    for (int i = 0; i < CC_SHA1_DIGEST_LENGTH; i++) {
        [result appendFormat:@"%02x", digest[i]];
    }
    return [result copy];
}

/**  中文转拼音  */
- (NSString *)pinYinWithString:(NSString *)chinese
{
    NSString  * pinYinStr = [NSString string];
    if (chinese.length){
        NSMutableString * pinYin = [[NSMutableString alloc]initWithString:chinese];
        //1.先转换为带声调的拼音
        if(CFStringTransform((__bridge CFMutableStringRef)pinYin, 0, kCFStringTransformMandarinLatin, NO)) {
            NSLog(@"pinyin: %@", pinYin);
        }
        //2.再转换为不带声调的拼音
        if (CFStringTransform((__bridge CFMutableStringRef)pinYin, 0, kCFStringTransformStripDiacritics, NO)) {
            NSLog(@"pinyin: %@", pinYin);
            //3.去除掉首尾的空白字符和换行字符
            pinYinStr = [pinYinStr stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
            //4.去除掉其它位置的空白字符和换行字符
            pinYinStr = [pinYinStr stringByReplacingOccurrencesOfString:@"\r" withString:@""];
            pinYinStr = [pinYinStr stringByReplacingOccurrencesOfString:@"\n" withString:@""];
            pinYinStr = [pinYinStr stringByReplacingOccurrencesOfString:@" " withString:@""];
        }
    }
    return pinYinStr;
}

-(NSString*)encodeString{
    
    // CharactersToBeEscaped = @":/?&=;+!@#$()~',*";
    // CharactersToLeaveUnescaped = @"[].";
    
    NSString *encodedString = (NSString *)
    CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
                                                              (CFStringRef)self,
                                                              NULL,
                                                              (CFStringRef)@"!*'();:@&=+$,/?%#[]",
                                                              kCFStringEncodingUTF8));
    
    return encodedString;
}

//URLDEcode
-(NSString *)decodeString

{
    //NSString *decodedString = [encodedString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding ];
    
    NSString *decodedString  = (__bridge_transfer NSString *)CFURLCreateStringByReplacingPercentEscapesUsingEncoding(NULL,
                                                                                                                     (__bridge CFStringRef)self,
                                                                                                                     CFSTR(""),
                                                                                                                     CFStringConvertNSStringEncodingToEncoding(NSUTF8StringEncoding));
    return decodedString;
}

//计算字符串长度 1中文2字符
- (int)textLength {
    float number = 0.0;
    for (int index = 0; index < [self length]; index++) {
        NSString *character = [self substringWithRange:NSMakeRange(index, 1)];
        if ([character lengthOfBytesUsingEncoding:NSUTF8StringEncoding] == 3) {
            number = number + 2;
        } else {
            number = number + 1;
        }
    }
    return ceil(number);
}

//限制最大显示长度
- (NSString *)limitMaxTextShow:(NSInteger)limit {
    NSString *Orgin = [self copy];
    for (NSInteger i = Orgin.length; i > 0; i--) {
        NSString *Get = [Orgin substringToIndex:i];
        if (Get.textLength <= limit) {
            return Get;
        }
    }
    return self;
}

//邮箱格式验证
- (BOOL)validateEmail {
    NSString *emailRegex = @"\\b([a-zA-Z0-9%_.+\\-]+)@([a-zA-Z0-9.\\-]+?\\.[a-zA-Z]{2,6})\\b";
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
    return [emailTest evaluateWithObject:self];
}

//验证是否ASCII码
- (BOOL)isASCII {
    NSCharacterSet *cs;
    cs = [NSCharacterSet characterSetWithCharactersInString:@"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789@／:;（）¥「」!,.?<>£＂、[]{}#%-*+=_\\|~＜＞$€^•'@#$%^&*()_+'\"/"
                                                             ""];
    NSRange specialrang = [self rangeOfCharacterFromSet:cs];
    if (specialrang.location != NSNotFound) {
        return YES;
    }
    return NO;
}

//验证是含本方法定义的 “特殊字符”
- (BOOL)isSpecialCharacter {
    NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:@"@／:;（）¥「」!,.?<>£＂、[]{}#%-*+=_\\|~＜＞$€^•'@#$%^&*()_+'\"/"
                                                                              ""];
    NSRange specialrang = [self rangeOfCharacterFromSet:set];
    if (specialrang.location != NSNotFound) {
        return YES;
    }
    return NO;
}

// 验证是否是数字
- (BOOL)isNumber {
    NSCharacterSet *cs;
    cs = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];
    NSRange specialrang = [self rangeOfCharacterFromSet:cs];
    if (specialrang.location != NSNotFound) {
        return YES;
    }
    return NO;
}

// 验证字符串里面是否都是数字
- (BOOL)isPureNumber {
    NSUInteger length = [self length];
    for (float i = 0; i < length; i++) {
        // NSString * c=[mytimestr characterAtIndex:i];
        NSString *STR = [self substringWithRange:NSMakeRange(i, 1)];
        NSLog(@"%@", STR);
        if ([STR isNumber]) {
            continue;
        } else {
            return NO;
        }
    }
    return YES;
}

//去掉 表情符号
- (NSString *)disableEmoji {
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"[^\\u0020-\\u007E\\u00A0-\\u00BE\\u2E80-\\uA4CF\\uF900-\\uFAFF\\uFE30-\\uFE4F\\uFF00-\\uFFEF\\u0080-\\u009F\\u2000-\\u201f\r\n]" options:NSRegularExpressionCaseInsensitive error:nil];
    NSString *modifiedString = [regex stringByReplacingMatchesInString:self
                                                               options:0
                                                                 range:NSMakeRange(0, [self length])
                                                          withTemplate:@""];
    return modifiedString;
}

平时多总结，总会有用到的时候。