由于未捕获而终止应用程序 > 异常“NSInvalidArgumentException”

Question

This seems like it should be pretty straight forward - but alas, I'm getting a crash. I'm simply trying to set my UILabel with the text returned from the users_name field:

.m

NSMutableDictionary *viewParams = [NSMutableDictionary new];
[viewParams setValue:@"u000" forKey:@"view_name"];
[DIOSView viewGet:viewParams success:^(AFHTTPRequestOperation *operation, id responseObject) {


   self.userData = [responseObject mutableCopy];

   self.username.text = [self.userData objectForKey:@"users_name"];

   dispatch_async(dispatch_get_main_queue(), ^(void){

    });


} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Failure: %@", [error localizedDescription]);
}];

The console data returns:

2016-04-05 12:25:36.877 [1331:350069] This is the Other User Data (
        {
        address = "Vancouver";
        userbio = "There is currently no bio available for this user. If you have added your bio, and require assistance, please contact the  Team.";
        "users_name" = Brittany;
    },

That said, this line is causing the crash:

self.username.text = [self.userData objectForKey:@"users_name"];

And this is the error:

2016-04-05 12:25:36.878 [1331:350069] -[__NSCFArray objectForKey:]: unrecognized selector sent to instance 0x15a23c100 2016-04-05 12:25:36.881 [1331:350069] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFArray objectForKey:]: unrecognized selector sent to instance 0x15a23c100' * First throw call stack: (0x181d51900 0x1813bff80 0x181d5861c 0x181d555b8 0x181c5968c 0x1000cce9c 0x1000c72bc 0x1000d3cc4 0x100459bf0 0x100459bb0 0x10045f658 0x181d08bb0 0x181d06a18 0x181c35680 0x183144088 0x186aacd90 0x1000d4c88 0x1817d68b8) libc++abi.dylib: terminating with uncaught exception of type NSException

How might I fix this? It seems like it should be simple...

Answer 1

I suppose userData is an Array type. Array have no key values. Try:
[[self.userData objectAtIndex:0] objectForKey:@"users_name"];