In my iOS 5 app, I have an NSString that contains a JSON string. I would like to deserialize that JSON string representation into a native NSDictionary object.
"{\"password\" : \"1234\", \"user\" : \"andreas\"}"
I tried the following approach:
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:@"{\"2\":\"3\"}"
options:NSJSONReadingMutableContainers
error:&e];
But it throws the a runtime error. What am I doing wrong?
-[__NSCFConstantString bytes]: unrecognized selector sent to instance 0x1372c
*** Terminating app due to uncaught exception 'NSInvalidArgumentException',
reason: '-[__NSCFConstantString bytes]: unrecognized selector sent to instance 0x1372c'
ベストアンサー1
It looks like you are passing an NSString parameter where you should be passing an NSData parameter:
NSError *jsonError;
NSData *objectData = [@"{\"2\":\"3\"}" dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:objectData
options:NSJSONReadingMutableContainers
error:&jsonError];