NSCFNumber unrecognized selector

i want to send data between views, but i get an error: unrecognized selector....

and the in the debugger, the variable mystring is a NSCFNumber ("at this time") instead of NSString...

allergy_appAppDelegate.h

#import <UIKit/UIKit.h>

@interface allergy_appAppDelegate : NSObject <UIApplicationDelegate, UITabBarControllerDelegate> {
    UIWindow *window;
    UITabBarController *tabBarController;
    NSMutableArray  *result_array;
}

@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet UITabBarController *tabBarController;
@property (copy , readwrite) NSMutableArray *result_array;

开发者_运维技巧@end

viewcontroller.m

        allergy_appAppDelegate *dataCenter = (allergy_appAppDelegate *)[[UIApplication sharedApplication]delegate];
        dataCenter.result_array = [[NSMutableArray alloc] initWithArray:Parser_result];

result.m

   allergy_appAppDelegate *dataCenter = (allergy_appAppDelegate*)[[UIApplication sharedApplication]delegate];
   show_user_array = [[NSMutableArray alloc] initWithArray: dataCenter.result_array]

for (NSString *mystring in show_user_array) {        
    textView.text = [[textView text] stringByAppendingString:@"\n"];
    textView.text = [[textView text] stringByAppendingString:mystring];
}

Instance variables should be camel-cased, not have _. I.e. result_array should be resultArray. Classes start with capital letters.

Are you sure your result array is full of instances of NSString or NSNumber (or whatever you need)?

Given that you are leaking the array here...

    dataCenter.result_array = [[NSMutableArray alloc] initWithArray:Parser_result];

... it is unlikely that this is an over-release problem. Note also that copy with NSMutableArray won't do what you want (the compiler should flag it, but doesn't). -copy always returns an immutable copy of an instance of a class cluster.