如何将CGPoint添加到NSMutableArray？ [英] How do I add a CGPoint to NSMutableArray?

问题描述

我想将我的CGPoint存储到NSMutable数组，所以，我有这样的方法：

I want to store my CGPoint to the NSMutable Array, so , I have method like this:

[self.points addObject:CGPointMake(x, y)];

但是我得到了错误，它说：

But I got the error, it said that :

addObject的参数1的不兼容类型。

Incompatible type for argument 1 of "addObject".

所以，我查看了API，

So, I check out the API,

- (void)addObject:(id)anObject

anObject要添加到接收者内容的结尾
的对象。此值
不得为零。

anObject The object to add to the end of the receiver's content. This value must not be nil.

因此，我认为 CGPointMake 可以创建一个Object，但不能分配它。会发生什么？

So, I think the "CGPointMake" can make a Object, but it can't be assigned. What happens?

推荐答案

问题是CGPoint实际上只是一个C结构，它不是一个对象：

The problem is that CGPoint is actually just a C structure it is not an object:

struct CGPoint {
   CGFloat x;
   CGFloat y;
};
typedef struct CGPoint CGPoint;

如果你在iPhone上，你可以使用NSValue UIKit添加来将CGPoint转换为NSValue对象。

If you are on the iPhone you can use the NSValue UIKit additions to convert the CGPoint to an NSValue object.

有关示例，请参阅此前一个答案：如何以简单的方式将CGPoint对象添加到NSArray？

See this previous answer for examples: How can I add CGPoint objects to an NSArray the easy way?

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