弱自引用的泛型typeof

本文介绍了弱自引用的泛型typeof的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我试图找出一种方法使用 typeof 创建一个弱引用 self 块，以避免保留周期。

当我第一次读到这个，似乎约定是使用 __ block typeof（self）bself = self; ，它使用 __ block 进行编译，以避免保留周期不再工作， __ weak

但是 __ weak typeof（self）bself = self; 会导致错误：

类型'typeof（self）'（也称为'TUAccountsViewController * const __strong'）已经设置了保留属性 $ b

有没有办法使用 typeof 或另一个调用来通常创建一个弱引用 self

解决方案

这样有效！

__ typeof __（o）__weak

我在我的BBlock项目中定义了 BBlockWeakSelf 可以这样使用：

BBlockWeakSelf wself = self;

github/kgn/BBlock/blob/master/BBlock.h

根据Aleph7编辑回应。

I am trying to figure out a way to use typeof to create a weak reference to self for use in blocks to avoid retain cycles.

When I first read about this it seems that the convention was to use __block typeof(self) bself = self;, which compiles but using __block to avoid retain cycles doesn't work anymore and __weak should be used instead.

However __weak typeof(self) bself = self; results in an error:

The type 'typeof (self)' (aka 'TUAccountsViewController *const __strong') already has retainment attributes set on it

Is there a way to use typeof or another call to generically create a weak reference to self?

解决方案

This works!

__typeof__(o) __weak

Which I've defined in my BBlock project as BBlockWeakSelf which can be used like this:

BBlockWeakSelf wself = self;

github/kgn/BBlock/blob/master/BBlock.h

Edited based on Aleph7's response.