Why can’t I release an object anymore? [duplicate]

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You need to turn off Automatic Reference Counting. You do this by clicking on your project in the navigator (the top item in the finder-like thing on the left), then click on your target, select “Build Settings” and turn off the option “Objective-C Automatic Reference Counting” (you can use the search field on the upper right to search it).

Another possibility is to migrate your project to ARC.

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