1v1/MSYOUPAI/3rd/NIMChat/NIMKit/Category/NSString+NIMKit.m

//
//  NSString+NIM.m
//  NIMKit
//
//  Created by chris.
//  Copyright (c) 2015年 NetEase. All rights reserved.
//

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

@implementation NSString (NIMKit)

- (CGSize)nim_stringSizeWithFont:(UIFont *)font{
    return [self sizeWithAttributes:@{NSFontAttributeName:font}];
}

- (NSString *)nim_MD5String {
    const char *cstr = [self 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]
            ];
}


- (NSUInteger)nim_getBytesLength
{
    NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
    return [self lengthOfBytesUsingEncoding:enc];
}


- (NSString *)nim_stringByDeletingPictureResolution{
    NSString *doubleResolution  = @"@2x";
    NSString *tribleResolution = @"@3x";
    NSString *fileName = self.stringByDeletingPathExtension;
    NSString *res = [self copy];
    if ([fileName hasSuffix:doubleResolution] || [fileName hasSuffix:tribleResolution]) {
        res = [fileName substringToIndex:fileName.length - 3];
        if (self.pathExtension.length) {
            res = [res stringByAppendingPathExtension:self.pathExtension];
        }
    }
    return res;
}


- (UIColor *)nim_hexToColor
{
    unsigned rgbValue = 0;
    NSScanner *scanner = [NSScanner scannerWithString:self];
    //去掉#
    [scanner setScanLocation:1];
    [scanner scanHexInt:&rgbValue];
    return [UIColor colorWithRed:((rgbValue & 0xFF0000) >> 16)/255.0 green:((rgbValue & 0xFF00) >> 8)/255.0 blue:(rgbValue & 0xFF)/255.0 alpha:1.0];
}

@end