'NSInvalidArgumentException', reason: '-[__NSCFString encodeString:]: unrecognized selector sent to instance

Question

I am making encoding to my NSString value entered in textfield in iOS app.

This is my code

NSString *encodedStrr = [myTextFeild.text encodeString:NSUTF8StringEncoding];
NSString *encodedUrlStrr =      [NSString stringWithFormat:
                             @"http://www.damain.com:8080/app/f/query?from=%@",
                             encodedStrr];
NSURL *urlr11 = [NSURL URLWithString: encodedUrlStrr];

I am getting the following error,

    2016-04-19 11:45:46.186 FactualNote[3137:11303] -[__NSCFString  encodeString:]: unrecognized selector sent to instance 0x71c5100
2016-04-19 11:45:46.187 FactualNote[3137:11303] *** Terminating app due     to uncaught exception 'NSInvalidArgumentException', reason: '-  [__NSCFString encodeString:]: unrecognized selector sent to instance 0x71c5100'
*** First throw call stack:
(0x1c93012 0x10d0e7e 0x1d1e4bd 0x1c82bbc 0x1c8294e 0x30ff 0x10e4705     0x182c0 0x18258 0xd9021 0xd957f 0xd86e8 0x47cef 0x47f02 0x25d4a 0x17698 0x1beedf9 0x1beead0 0x1c08bf5 0x1c08962 0x1c39bb6 0x1c38f44 0x1c38e1b 0x1bed7e3 0x1bed668 0x14ffc 0x1eed 0x1e15)

libc++abi.dylib: terminate called throwing an exception

I followed this url to encode https://madebymany.com/blog/url-encoding-an-nsstring-on-ios .

This is the file I am using and import it in viewController.m.

Desing.h

@interface NSString (encode)
    - (NSString *)encodeString:(NSStringEncoding)encoding;
@end

Desing.m

@implementation NSString (encode)
    - (NSString *)encodeString:(NSStringEncoding)encoding
    {
        return (NSString *) CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(NULL, (CFStringRef)self,
                                                            NULL, (CFStringRef)@";/?:@&=$+{}<>,",
                                                            CFStringConvertNSStringEncodingToEncoding(encoding)));
    }  
@end

Following post answer says, this could be memory problem Unrecognized Selector Sent to Instance [NSCFString subarrayWithRange:] .

How do I come out from this.

Answer 1

检查您的类别（Desing.m）是否添加到目标中，这可能是原因。