iOS字符串编码与解码方法的实现与调用(UrlEncode/UrlDecode)

Vk/nQmguwJIN

Vk%2FnQmguwJIN

Vk/nQmguwJIN

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

//URLDEcode
+(NSString *)decodeString:(NSString*)encodedString

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

#import <Foundation/Foundation.h>

@interface NSString (URLEncoding)

// 字符串转码
- (NSString*)urlEncodeString;

// 反URL编码
- (NSString *)decodeFromPercentEscapeString;

@end

#import "NSString+URLEncoding.h"

@implementation NSString (URLEncoding)

// 字符串编码
- (NSString *)urlEncodeString
{
    NSString *result = (NSString *)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)self, NULL, CFSTR(":/?#[]@!$&’(){}<>*+,;="),kCFStringEncodingUTF8));
    return result;
}

// 反URL编码
- (NSString *)decodeFromPercentEscapeString
{
    NSMutableString *outputStr = [NSMutableString stringWithString:self];
    [outputStr replaceOccurrencesOfString:@"+"
                               withString:@" "
                                  options:NSLiteralSearch
                                    range:NSMakeRange(0, [outputStr length])];
    
    return [outputStr stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
}

#import "NSString+URLEncoding.h"

[testStr urlEncodeString];