strong/weak/assign/copy/retain
2015-12-31 00:43
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strong: 引用计数
weak: 弱引用,每个属性有一个表记录weak引用,属性被释放时把weak引用置成nil
assign: 基本类型使用
copy:
retain: MRC下使用,基本同strong
weak: 弱引用,每个属性有一个表记录weak引用,属性被释放时把weak引用置成nil
assign: 基本类型使用
copy:
retain: MRC下使用,基本同strong
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