使用ARC编码和解码CGMutablePathRef [英] Encode and Decode CGMutablePathRef with ARC

问题描述

在ARC下，是否可以使用NSCoding对CGMutablePathRef(或其非可变形式)进行编码/解码?我天真地尝试:

Under ARC, is it possible to encode/decode a CGMutablePathRef (or its non-mutable form) using NSCoding? Naively I try:

path = CGPathCreateMutable();
...
[aCoder encodeObject:path]

但是我从编译器中得到一个友好的错误:

but I get a friendly error from the compiler:

Automatic Reference Counting Issue: Implicit conversion of an Objective-C pointer to 'CGMutablePathRef' (aka 'struct CGPath *') is disallowed with ARC

该怎么编码?

推荐答案

NSCoding是协议.它的方法只能用于符合NSCoding协议的对象. CGPathRef甚至不是对象，因此NSCoding方法将无法直接工作.这就是为什么您会收到该错误.

NSCoding is a protocol. Its methods can only be used with objects that conform to the NSCoding protocol. a CGPathRef isn't even an object, so NSCoding methods won't work directly. That's why you're getting that error.

这是一个人，他提出了一种序列化CGPath的方法.

Here's a guy who has come up with a way to serialize CGPaths.

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