iOS NSString 常用 Category（类目）分享

1、格式转换，UInt64转为NSString

#define KB 1024
#define MB (1024*KB)
#define GB (1024*MB)
#define TB ((UInt64)1024*GB)

+ (NSString*)numberFormatWWith:(UInt64)size {
    if (size >= 10000) {
        return [NSString stringWithFormat:@"%.1fw", (size/10000.0f)];
    } else {
        return @(size).stringValue;
    }
}

+ (NSString*)volumeWith:(UInt64)size {
    if (size > (UInt64)TB)
    {
        return [NSString stringWithFormat:@"%0.2fT", (double)size / TB];
    }
    else if (size > GB)
    {
        return [NSString stringWithFormat:@"%0.2fG", (double)size / GB];
    }
    else if (size > MB)
    {
        return [NSString stringWithFormat:@"%0.2fM", (double)size / MB];
    }
    else if (size > KB)
    {
        return [NSString stringWithFormat:@"%0.2fK", (double)size / KB];
    }
    else
    {
        return [NSString stringWithFormat:@"%lluB", size];
    }
    return nil;
}

2、手机号字符处理

- (NSString *)stringByTrimingWhitespace {
    return [self stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
}

- (NSUInteger)numberOfLines {
    return [[self componentsSeparatedByString:@"\n"] count] + 1;
}

- (NSString *)encryptPhone {
    NSMutableString *phone = [NSMutableString stringWithString:self];
    if (phone && phone.length >= 8) {
        [phone replaceCharactersInRange:NSMakeRange(phone.length-8, 4) withString:@"****"];
    }
    return phone;
}

3、URL Encode

- (NSString *)urlEncodeString {
    static NSString * const kAFCharactersGeneralDelimitersToEncode = @":#[]@"; // does not include "?" or "/" due to RFC 3986 - Section 3.4
    static NSString * const kAFCharactersSubDelimitersToEncode = @"!$&'()*+,;=";

    NSMutableCharacterSet * allowedCharacterSet = [[NSCharacterSet URLQueryAllowedCharacterSet] mutableCopy];
    [allowedCharacterSet removeCharactersInString:[kAFCharactersGeneralDelimitersToEncode stringByAppendingString:kAFCharactersSubDelimitersToEncode]];

    // FIXME: https://github.com/AFNetworking/AFNetworking/pull/3028
    // return [self stringByAddingPercentEncodingWithAllowedCharacters:allowedCharacterSet];

    static NSUInteger const batchSize = 50;

    NSUInteger index = 0;
    NSMutableString *escaped = @"".mutableCopy;

    while (index < self.length) {
        NSUInteger length = MIN(self.length - index, batchSize);
        NSRange range = NSMakeRange(index, length);

        // To avoid breaking up character sequences such as 👴🏻👮🏽
        range = [self rangeOfComposedCharacterSequencesForRange:range];

        NSString *substring = [self substringWithRange:range];
        NSString *encoded = [substring stringByAddingPercentEncodingWithAllowedCharacters:allowedCharacterSet];
        [escaped appendString:encoded];

        index += range.length;
    }
    return escaped;
}

4、MD5，AES加密

- (NSString *)getStringMd5:(NSString *)str {
    const char *cStr = [str 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]
             ] lowercaseString];
}
-(NSString *) aes256_encrypt:(NSString *)key {
    const char *cstr = [self cStringUsingEncoding:NSUTF8StringEncoding];
    NSData *data = [NSData dataWithBytes:cstr length:self.length];
    //对数据进行加密
    NSData *result = [data aes256_encrypt:key];
    
    //转换为2进制字符串
    if (result && result.length > 0) {
        
        Byte *datas = (Byte*)[result bytes];
        NSMutableString *output = [NSMutableString stringWithCapacity:result.length * 2];
        for(int i = 0; i < result.length; i++){
            [output appendFormat:@"%02x", datas[i]];
        }
        return output;
    }
    return nil;
}
- (NSString *) aes256_decrypt:(NSString *)key {
    //转换为2进制Data
    NSMutableData *data = [NSMutableData dataWithCapacity:self.length / 2];
    unsigned char whole_byte;
    char byte_chars[3] = {'\0','\0','\0'};
    int i;
    for (i=0; i < [self length] / 2; i++) {
        byte_chars[0] = [self characterAtIndex:i*2];
        byte_chars[1] = [self characterAtIndex:i*2+1];
        whole_byte = strtol(byte_chars, NULL, 16);
        [data appendBytes:&whole_byte length:1];
    }
    
    //对数据进行解密
    NSData* result = [data aes256_decrypt:key];
    if (result && result.length > 0) {
        return [[NSString alloc] initWithData:result encoding:NSUTF8StringEncoding];
    }
    return nil;
}

5、计算Label的宽高

- (CGFloat)heightWithLabelFont:(UIFont *)font {
    CGFloat height = 0;
    if(self.length ==0)
    {
        height = 0;
    }
    else
    {
        CGSize rectSize = [self sizeWithAttributes:@{NSFontAttributeName:font}];
        height = rectSize.height;

    }
    return height;
    
}
- (CGFloat)heightWithLabelFont:(UIFont *)font withLabelWidth:(CGFloat)width {
    CGFloat height = 0;
    if(self.length ==0)
    {
        height = 0;
    }
    else
    {
        NSDictionary *attribute = @{NSFontAttributeName:font};
        CGSize rectSize = [self boundingRectWithSize:CGSizeMake(width, MAXFLOAT)
                                options:NSStringDrawingTruncatesLastVisibleLine|
                                        NSStringDrawingUsesLineFragmentOrigin|
                                        NSStringDrawingUsesFontLeading
                            attributes:attribute
                            context:nil].size;
        height = rectSize.height;
    }
    return height;
}

/**
 *  根据文字内容动态计算UILabel宽高
 *  @param maxWidth label宽度
 *  @param font  字体
 *  @param lineSpacing  行间距
 */

- (CGRect)boundingRectWithWidth:(CGFloat)maxWidth withTextFont:(UIFont *)font withLineSpacing:(CGFloat)lineSpacing {
    CGSize maxSize = CGSizeMake(maxWidth, CGFLOAT_MAX);
    //段落样式
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    //设置行间距
    [paragraphStyle setLineSpacing:lineSpacing];
//#warning 此处设置NSLineBreakByTruncatingTail会导致计算文字高度方法失效
//    [paragraphStyle setLineBreakMode:NSLineBreakByTruncatingTail];
    //计算文字尺寸
    CGRect rect = [self boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:font,NSParagraphStyleAttributeName:paragraphStyle} context:nil];
    return rect;
}

/**
 *  NSString转换成NSMutableAttributedString
 *  @param font  字体
 *  @param lineSpacing  行间距
 */

- (NSMutableAttributedString *)attributedStringFromStingWithFont:(UIFont *)font withLineSpacing:(CGFloat)lineSpacing {
    NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc] initWithString:self attributes:@{NSFontAttributeName:font}];
    
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    [paragraphStyle setLineSpacing:lineSpacing];
    [paragraphStyle setLineBreakMode:NSLineBreakByTruncatingTail]; //截断方式，"abcd..."
    [attributedStr addAttribute:NSParagraphStyleAttributeName
                          value:paragraphStyle
                          range:NSMakeRange(0, [self length])];
    return attributedStr;
}

6、富文本属性数组转富文本

- (NSMutableAttributedString *)mutableAttributedStringWithStringAttributes:(NSArray *)attributes {
    NSMutableAttributedString *attributedString = nil;
    if (self) {
        attributedString = [[NSMutableAttributedString alloc] initWithString:self];
        for (id <StringAttributeProtocol> attribute in attributes) {
            [attributedString addAttribute:[attribute attributeName]
                                     value:[attribute attributeValue]
                                     range:[attribute effectiveStringRange]];
        }
    }
    return attributedString;
}
- (NSAttributedString *)attributedStringWithStringAttributes:(NSArray *)attributes {
    NSAttributedString *attributedString = nil;
    if (self) {
        NSMutableDictionary *attributesDictionary = [NSMutableDictionary dictionary];
        for (id <StringAttributeProtocol> attribute in attributes) {
            [attributesDictionary setObject:[attribute attributeValue]
                                     forKey:[attribute attributeName]];
        }
        attributedString = [[NSAttributedString alloc] initWithString:self
                                                           attributes:attributesDictionary];
    }
    return attributedString;
}

7、NSData转base64的NSString

static char base64EncodingTable[64] = {
    'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
    'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
    'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
    'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
};
+ (NSString *) base64StringFromData:(NSData *)data length:(long)length {
    unsigned long ixtext, lentext;
    long ctremaining;
    unsigned char input[3], output[4];
    short i, charsonline = 0, ctcopy;
    const unsigned char *raw;
    NSMutableString *result;
    
    lentext = [data length]; 
    if (lentext < 1)
        return @"";
    result = [NSMutableString stringWithCapacity: lentext];
    raw = [data bytes];
    ixtext = 0; 
    
    while (true) {
        ctremaining = lentext - ixtext;
        if (ctremaining <= 0) 
            break;        
        for (i = 0; i < 3; i++) { 
            unsigned long ix = ixtext + i;
            if (ix < lentext)
                input[i] = raw[ix];
            else
                input[i] = 0;
        }
        output[0] = (input[0] & 0xFC) >> 2;
        output[1] = ((input[0] & 0x03) << 4) | ((input[1] & 0xF0) >> 4);
        output[2] = ((input[1] & 0x0F) << 2) | ((input[2] & 0xC0) >> 6);
        output[3] = input[2] & 0x3F;
        ctcopy = 4;
        switch (ctremaining) {
            case 1: 
                ctcopy = 2; 
                break;
            case 2: 
                ctcopy = 3; 
                break;
        }
        
        for (i = 0; i < ctcopy; i++)
            [result appendString: [NSString stringWithFormat: @"%c", base64EncodingTable[output[i]]]];
        
        for (i = ctcopy; i < 4; i++)
            [result appendString: @"="];
        
        ixtext += 3;
        charsonline += 4;
        
        if ((length > 0) && (charsonline >= length))
            charsonline = 0;
    }     
    return result;
}

8、时间戳与时间转换

#pragma mark - 将某个时间转化成 时间戳
+ (NSInteger)timeSwitchTimestamp:(NSString *)formatTime andFormatter:(NSString *)format{
    
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateStyle:NSDateFormatterMediumStyle];
    [formatter setTimeStyle:NSDateFormatterShortStyle];
    [formatter setDateFormat:format]; //(@"YYYY-MM-dd hh:mm:ss") ----------设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制
    NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];
    [formatter setTimeZone:timeZone];
    NSDate* date = [formatter dateFromString:formatTime]; //------------将字符串按formatter转成nsdate
    //时间转时间戳的方法:
    NSInteger timeSp = [[NSNumber numberWithDouble:[date timeIntervalSince1970]] integerValue];
    return timeSp;
    
}
#pragma mark - 将某个时间戳转化成 时间
+ (NSString *)timestampSwitchTime:(NSInteger)timestamp andFormatter:(NSString *)format{
    
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateStyle:NSDateFormatterMediumStyle];
    [formatter setTimeStyle:NSDateFormatterShortStyle];
    [formatter setDateFormat:format]; // （@"YYYY-MM-dd hh:mm:ss"）----------设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制
    NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];
    [formatter setTimeZone:timeZone];
    NSDate *confromTimesp = [NSDate dateWithTimeIntervalSince1970:timestamp];
    NSString *confromTimespStr = [formatter stringFromDate:confromTimesp];
    return confromTimespStr;
    
}