Swift：CGPathRelease和ARC [英] Swift: CGPathRelease and ARC

问题描述

刚刚更新到Xcode Beta 4，并注意到以下代码中出现以下编译器错误：

Just updated to Xcode Beta 4, and noticed the following compiler error with my code below:

var path = CGPathCreateMutable()
...
CGPathRelease(path)

'CGPathRelease'不可用：Core Foundation对象是
自动内存管理

'CGPathRelease' is unavailable: Core Foundation objects are automatically memory managed

所以我只是删除我的版本电话，一切都应该没问题？还是有更多我想念的东西？是否有任何特殊情况我应该注意ARC？

So do I simply just remove my release calls and everything should be fine? Or is there something more I'm missing? And are there any special cases I should be aware of with ARC?

推荐答案

使用Cocoa数据类型 使用Swift与Cocoa和Objective-C 说（强调我的）：

从带注释的API返回的Core Foundation对象在Swift中自动进行内存管理 - 你做的不需要调用 CFRetain ， CFRelease ，或 CFAutorelease 自己发挥作用。如果从自己的C函数和Objective-C方法返回Core Foundation对象，则使用 CF_RETURNS_RETAINED 或 CF_RETURNS_NOT_RETAINED 对它们进行注释 。

Core Foundation objects returned from annotated APIs are automatically memory managed in Swift—you do not need to invoke the CFRetain, CFRelease, or CFAutorelease functions yourself. If you return Core Foundation objects from your own C functions and Objective-C methods, annotate them with either CF_RETURNS_RETAINED or CF_RETURNS_NOT_RETAINED.

...

当Swift导入尚未注释的API时，编译器不能自动内存管理返回的Core Foundation对象。 Swift将这些返回的Core Foundation对象包装在 Unmanaged< T> 结构中。

When Swift imports APIs that have not been annotated, the compiler cannot automatically memory manage the returned Core Foundation objects. Swift wraps these returned Core Foundation objects in an Unmanaged<T> structure.

所以是的，除非你有一个 Unmanaged 结构，这是正确的，你不必担心手动释放对象。

So yes, unless you have an Unmanaged struct, this is correct and you don't have to worry about manually releasing the object.

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