githubdelegate
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+## 项目中遇到一次简单的耗时操作排查
+
+最近在项目中有一个简单`collectionView` 照片列表，每次照片内容改变需要刷新的时候`reloadData`时候都会明显的卡顿现象
+
+
+
+swift  Float 是 引用类型吗 为什么使用`OBJC_ASSOCIATION_RETAIN_NONATOMIC` 不然就崩溃 野指针， 僵尸对象
+
+```
+            objc_setAssociatedObject(self, &AssociatedKey.fileSizeKey, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
+```
+
+
+[xxxxx](https://www.jianshu.com/p/75de1a6e28f2)