更新 *重写带 copy 关键字的 setter* 的答案 #1
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首先，if 的确比对象 copy 要快。 另外，判断对象是否相同是为了保证代码执行的正确性。在非 ARC 环境下，如果穿入对象 retain count 为 1，不做判断的话，release 之后对象内存释放，下一步 copy 也会出错。
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首先，if 的确比对象 copy 要快。
另外，判断对象是否相同是为了保证代码执行的正确性。在非 ARC 环境下，如果穿入对象 retain count 为 1，不做判断的话，release 之后对象内存释放，下一步 copy 也会出错。