如何申报在Objective-C如果可能的结构的typedef枚举 [英] How to declare a typedef enum of structs in Objective-C if possible

问题描述

在为了能够限制位置可用位置的列表，我尝试了以下声明：

In order to be able to limit the positions to a list of available positions I tried the following declaration:

typedef enum
{
    feedbackPositionMiddle = {20.f,80.f},
    feedBackPositionTop    = {20.f,40.f},
    feedBackPositionBottom = {20.f,120.f}

} feedBackPosition;

然而，这code似乎并不被接受。它是否错过的东西，或只是不可能？

However this code does not seems to be accepted. Does it misses something or is it just impossible?

推荐答案

您可以只声明整数类型，因此结构或任何其他类型的复合这里不允许枚举的。你的情况常量CGPoint可能是最好的选择：

You can declare enum only of integral type, so struct or any other composite type is not allowed here. In your case const CGPoint is probably the best option:

const CGPoint kFeedbackPositionMiddle = {20.f,80.f};
...

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