NSInvalidArgumentException无法识别的选择器已发送到实例

Question

I am working on a twitter viewing application and having an issue with getting the data to pass from the cell to the detail view. Everytime I click the cell my program terminates with this error.

2015-09-04 12:18:34.298 twitterView2[10580:872508] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[TwitterPostInfo objectForKey:]: unrecognized selector sent to instance 0x7f9fb261f890'
*** First throw call stack:
(
    0   CoreFoundation                      0x000000010527fc65 __exceptionPreprocess + 165
    1   libobjc.A.dylib                     0x0000000104f18bb7 objc_exception_throw + 45
    2   CoreFoundation                      0x00000001052870ad -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
    3   CoreFoundation                      0x00000001051dd13c ___forwarding___ + 988
    4   CoreFoundation                      0x00000001051dccd8 

Answer 1

Easiest way to find the location of the problem is in xCode go to the breakpoint navigator (Command + 7). Click the + at the bottom and select "Add Exception Breakpoint". Now when you run your program it will stop when the exception occurs and show you the stack trace instead of the "uncaught exception"

Answer 2

It's hard to know for sure without seeing where you're assigning the tweetDetail property of this class, but it would appear that you're assigning an object of type TwitterPostInfo, not NSDictionary. Check where you're setting this property and be sure it's the correct type.

Alternatively, if you are intending to pass a TwitterPostInfo object, you'll have to change the type of tweetDetail to match. Of course, you'll have to update how you access its data (I am assuming it's a custom class. I could not find anything via Google).

EDIT:

After seeing your prepareForSegue method, my guess is that you're intending to pass along a TwitterPostInfo object, not an NSDictionary. If this is true, you'll want to change tweetDetail's type from NSDictionary to TwitterPostInfo. Then, instead of using [self.tweetDetail objectForKey:@"text"] and [self.tweetDetail objectForKey:@"created_at"] , you'll want to use something equivalent to self.tweetDetail.text and self.tweetDetail.createdAt depending on how you structured your class.

Try this for TwitterDetailVC.h:

#import <UIKit/UIKit.h>
#import "TwitterPostInfo.h"

@interface TwitterDetailVC : UIViewController

@property (strong, nonatomic) TwitterPostInfo *tweetDetail;

@end

and this for TwitterDetailVC.m's viewDidLoad method

- (void)viewDidLoad {
    [super viewDidLoad];

    self.tweetTextLabel.text = self.tweetDetail.tweetText;
    self.tweetTimeLabel.text = self.tweetDetail.timeDate;
}