@property (copy, nonatomic) NSString *title; 中已经有copy #426
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| - (void)setTitle:(NSString *)title | ||
| { | ||
| _title = [title copy]; | ||
| _title = title; |
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我认为，属性中的copy是在自动生成setter时采用copy方式赋值。
手动添加setter时仍然需要手动copy。
所以这里仍然需要 _title = [title copy];
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