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(nonatomic, readwrite, retain) and (nonatomic, strong) in Objective-C ARC

原文 2012-08-24 17:01:38 4 2 objective-c/ ios/ xcode/ automatic-ref-counting/ llvm

Any difference?

Suppose they are the same as in ARC, retain should be replaced by strong?

So can I say that they are the same?

2 answers

No, there is no difference. In accordance to my answer here :

retain / strong : (automatically retains / releases values on set, makes sure values do not deallocate unexpectedly) (default if ARC and object type)

Also, readwrite is the default for a property, so that isn't necessary, and you are already specifying nonatomic .

strong replaces retain and functions similar. if its an object weak replaces assign(saying reference the object but do not incrment its reference count), nonatomic is the same between the two

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

making one property strong,nonatomic for objective-c

@property retain, assign, copy, nonatomic in Objective-C

nonatomic and readonly property in Objective-C

Evidence of atomic / nonatomic in Objective-C

In Objective-C with ARC, is it true that we usually only need to specify nonatomic as property attributes?

What is the C++ equivalent of Objective C “@property (nonatomic, retain)”?

Objective-C ARC: strong vs retain and weak vs assign

(retain, nonatomic) and (nonatomic, retain) any difference?

Difference between @property(nonatomic, retain)in Xcode 3.2 and @property(strong, nonatomic) in Xcode 4.2

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Related Question Objective-C declared @property attributes (nonatomic, copy, strong, weak) making one property strong,nonatomic for objective-c @property retain, assign, copy, nonatomic in Objective-C nonatomic and readonly property in Objective-C Evidence of atomic / nonatomic in Objective-C In Objective-C with ARC, is it true that we usually only need to specify nonatomic as property attributes? What is the C++ equivalent of Objective C “@property (nonatomic, retain)”? Objective-C ARC: strong vs retain and weak vs assign (retain, nonatomic) and (nonatomic, retain) any difference? Difference between @property(nonatomic, retain)in Xcode 3.2 and @property(strong, nonatomic) in Xcode 4.2

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(nonatomic, readwrite, retain) and (nonatomic, strong) in Objective-C ARC

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2 answers

solution1
4 ACCPTED 2012-08-24 17:05:25

solution2
0 2012-08-24 17:06:32

(nonatomic, readwrite, retain) and (nonatomic, strong) in Objective-C ARC

Question

2 answers

solution1 4 ACCPTED 2012-08-24 17:05:25

solution2 0 2012-08-24 17:06:32

solution1
4 ACCPTED 2012-08-24 17:05:25

solution2
0 2012-08-24 17:06:32