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fix typo
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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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@@ -278,7 +278,7 @@ typedef NS_ENUM(NSInteger, CYLSex) {
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`assign` 的“设置方法”只会执行针对“纯量类型” (scalar type,例如 CGFloat 或
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NSlnteger 等)的简单赋值操作。
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2. assigin 可以用非 OC 对象,而 weak 必须用于 OC 对象
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2. assign 可以用非 OC 对象,而 weak 必须用于 OC 对象
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###3. 怎么用 copy 关键字?
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用途:

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