弱自引用的泛型typeof [英] Generic typeof for weak self references

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; 
  

https://github.com/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;

https://github.com/kgn/BBlock/blob/master/BBlock.h

Edited based on Aleph7's response.

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