automatic-ref-counting Archives - Page 2 of 2

Semantic Issue: Property’s synthesized getter follows Cocoa naming convention for returning ‘owned’ objects

I’m currently using the iOS 5 SDK trying to develop my app. I’m trying to make an NSString a property, and then to ...

May 18, 2022
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Objective-C declared @property attributes (nonatomic, copy, strong, weak)

Can someone explain to me in detail when I must use each attribute: nonatomic, copy, strong, weak, and so on, for a declared ...

May 18, 2022
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Why does Apple recommend to use dispatch_once for implementing the singleton pattern under ARC?

What’s the exact reason for using dispatch_once in the shared instance accessor of a singleton under ARC? + (MyClass *)sharedInstance { // Static ...

May 16, 2022
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Can I use Objective-C blocks as properties?

Is it possible to have blocks as properties using the standard property syntax? Are there any changes for ARC? 8 Answers 8

May 14, 2022
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Objective-C ARC: strong vs retain and weak vs assign

There are two new memory management attributes for properties introduced by ARC, strong and weak. Apart from copy, which is obviously something completely ...

May 10, 2022
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Shall we always use [unowned self] inside closure in Swift

In WWDC 2014 session 403 Intermediate Swift and transcript, there was the following slide The speaker said in that case, if we don’t ...

May 3, 2022
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Should IBOutlets be strong or weak under ARC?

I am developing exclusively for iOS 5 using ARC. Should IBOutlets to UIViews (and subclasses) be strong or weak? The following: @property (nonatomic, ...

May 1, 2022
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performSelector may cause a leak because its selector is unknown

I’m getting the following warning by the ARC compiler: "performSelector may cause a leak because its selector is unknown". Here’s what I’m doing: ...

April 13, 2022
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How can I disable ARC for a single file in a project?

I am using ARC successfully in my project. However, I have encountered a few files (e.g., in unit tests and mock objects) where ...

April 13, 2022
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