//ARC模式下

//加密

+ (NSString *)encodeToPercentEscapeString: (NSString *) input

{

NSString *outputStr =

(__bridge NSString *)CFURLCreateStringByAddingPercentEscapes(

NULL, /* allocator */

(__bridge CFStringRef)input,

NULL, /* charactersToLeaveUnescaped */

(CFStringRef)@"!*'();:@&=+$,/?%#[]",

kCFStringEncodingUTF8);

return outputStr;

}

//解码

+ (NSString *)decodeFromPercentEscapeString: (NSString *) input

{

NSMutableString *outputStr = [NSMutableString stringWithString:input];

[outputStr replaceOccurrencesOfString:@"+"

withString:@""

options:NSLiteralSearch

range:NSMakeRange(0,[outputStr length])];

return

[outputStr stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

}

//1.非ARC模式下

+ (NSString *)encodeToPercentEscapeString: (NSString *) input {    // Encode all the reserved characters, per RFC 3986    // ()

NSString *outputStr = (NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,(CFStringRef)input,NULL,(CFStringRef)@"!*'();:@&=+$,/?%#[]",

kCFStringEncodingUTF8);

return outputStr;

}

+ (NSString *)decodeFromPercentEscapeString: (NSString *) input {

NSMutableString *outputStr = [NSMutableString stringWithString:input];

[outputStr replaceOccurrencesOfString:@"+"

withString:@" "

options:NSLiteralSearch

range:NSMakeRange(0, [outputStr length])];

return [outputStr stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

}