obj-c的Retain的属性和Copy的区别
<div class="MsoNormal" style="color: #222222; font-family: Arial,Tahoma,Helvetica,FreeSans,sans-serif; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 18px; white-space: normal; background-color: #ffffff; text-align: left; text-indent: 22.5pt;">1，可读性：readonly 、readwrite
页:
[1]