issue in encoding a string with percent escaping iphone

问题

This is my string.

NSString *str=@"A & B";

now i am converting it to NSUTF8StringEncoding.

str = [str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(@"str: %@", str);

space is replaced with %20 but & is not replaced with %26.

nslog show

str: A%20&%20B

This is also not working

NSString *str=@"(A) & (B)";
str = [str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(@"str: %@", str);

nslog show

str: (A)%20&%20(B)

I need this because i have to pass this as parameter value in webservice. Anybody have idea for this. Please help me for this issue. Nice answer will be appreciated

回答1:

You can use CFURLCreateStringByAddingPercentEscapes() to do that:

NSString *string = ...;
NSString *encodedString = CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (__bridge CFStringRef)string, NULL, CFSTR("!*'();:@&=+$,/?%#[]"), kCFStringEncodingUTF8));

来源：https://stackoverflow.com/questions/15132472/issue-in-encoding-a-string-with-percent-escaping-iphone