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Editorial Team
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Asked: 2026-06-09T03:10:43+00:00

Here, i have a NSMutableArray in my AppDelegate page, the array will be updated

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Here, i have a NSMutableArray in my AppDelegate page, the array will be updated when the user add the values (user name) in the database. Now i want the array values(user name) to be displayed in the next view to be list out in the Picker View. I know there is more related questions is there, but i can’t find the solution. Any help appreciated.

Here is my code:

The array i have declared in the AppDelegate page, named jobarray, now i need to copy the items in the jobarray into next view, there i have declared pickerarray. 

pickerarray = [[NSMutableArray alloc] initWithArray:appDelegate.jobarray copyItems:YES];

But it returns error message,

['NSInvalidArgumentException', reason: '-[Coffee copyWithZone:]: unrecognized selector sent to instance 0x822d410']     where 'Coffee' is my sqlite3 object file.
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1 Answer

  1. Editorial Team

    Your SQLite object does not conform to the NSCopying protocol – you haven’t implemented the

    - (id)copyWithZone:(NSZone *)zone;

    method. You can either implement this method to make your object copyable, but if you only need the copying for displaying, you’d better copy the array itself only:

    NSMutableArray *newArray = [originalArray mutableCopy];

    this only retains the first array’s objects, no need to mess with implementing the copying protocol.

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