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添加参考链接12题. ARC下,不显式指定任何属性关键字时,默认的关键字都有哪些?
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01《招聘一个靠谱的iOS》面试题参考答案/《招聘一个靠谱的iOS》面试题参考答案(上).md

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@@ -800,6 +800,12 @@ objc_setAssociatedObject(objectToBeDeallocted,
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atomic,readwrite,strong
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参考链接:
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1. [ ***Objective-C ARC: strong vs retain and weak vs assign*** ](http://stackoverflow.com/a/15541801/3395008)
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2. [ ***Variable property attributes or Modifiers in iOS*** ](http://rdcworld-iphone.blogspot.in/2012/12/variable-property-attributes-or.html)
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###13. 用@property声明的NSString(或NSArray,NSDictionary)经常使用copy关键字,为什么?如果改用strong关键字,可能造成什么问题?
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