YYXC_Manager/LNManager/NSString+ex.m

//
//  NSString+ex.m
//  LNManager
//
//  Created by EchoShacolee on 2017/4/6.
//  Copyright © 2017年 lee. All rights reserved.
//

#import "NSString+ex.h"
#import<CommonCrypto/CommonDigest.h>

@implementation NSString (ex)

- (NSString *)md5Encrypt
{
    const char *cStr = [self UTF8String];
    unsigned char result[16];
    CC_MD5( cStr, (unsigned int)strlen(cStr), result );
    NSString*  str = [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]
                      ];
    str = [str lowercaseString];
    return str;
}

-(CGFloat)heightForWid:(CGFloat)wid Font:(CGFloat)fontSize
{
    if (self.length == 0) {
        return 0;
    }
    //NSStringDrawingUsesFontLeading这个参数是计算多行文本时用的参数
    CGRect rect =  [self boundingRectWithSize:CGSizeMake(wid, MAXFLOAT)  options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:fontSize]} context:nil];

    //由于计算出来的值比实际需要的值略小，故需要对其向上取整
    double height = ceil(rect.size.height);
    return height;
    
}

-(CGFloat)widthForFont:(CGFloat)fontSize
{
    return  [self boundingRectWithSize:CGSizeMake(MAXFLOAT, 20)  options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName: [UIFont scaleSize:fontSize]} context:nil].size.width;
}

@end