Reference article
https://stablekernel.com/how-to-prevent-memory-leaks-in-swift-closures/
什么事循环引用
Person里面有apartment Apartment里面有person 这就是循环引用了。
weak和unknown的区别
weak是optional的不会崩溃 ，必须是var
unknown是non-optional的，会出现崩溃，可以为let
retain
如果一个object 有被人引用的记录retain就会被加1
如果retain为0，那么他就从内存中销毁。
前提是强引用，弱引用不会加1
weakify(self)展开后是: __weak typeof(self) __weak_self = self...
define WEAK_SELF __weak typeof(self)weakSelf = self; defi...
typeof(self) __weak weakSelf = self; Cannot create __weak...
1、__weak 与__strong 组合 __weak typeof(self) weakself = self...
``` __weak typeof(self) weakSelf = self; self.bootomShopp...
(```)__weak typeof(self) weakSelf = self;self.block = ^{_...
`` `` ``__weak typeof(self) weakSelf = self; `` ``__block...
__weak typeof(self) weakSelf = self;self.handler = ^{type...
/* 为 self 创造弱引用 */__weak typeof(self) weakSelf = self;/* ...
_weak typeof(self) weakSelf = self; 第一、weak弱引用不能持有对象实例。在持...
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