如何在类中存储位置（CLLocationCooperative2D）而不泄漏内存？

发布于 2024-08-24 12:41:35 字数 503 浏览 4 评论 0原文

我正在创建一个库，其中包含一个 API，用于根据 GPS 收集的某些值设置当前位置。我想将此位置存储在我的类中，然后更改我的库的行为（如果已设置）。

我的想法是：

@interface myLib
{
@property (nonatomic, retain) CLLocationCoordinate2D *location;
}

@implementation myLib
{
@synthesize location = _location;

- (void)setLocation:(CLLocationCoordinate2D *)loc {
location = loc;
}

- (void)someFunc {
 if (location != nil) ...  
}

}

但是，retain 不是 CLLocationCooperative2D 对象的有效属性。

那么，保存 CLLocationCooperative2D 供以后使用而不浪费内存的正确方法是什么？

原文

I am creating a library which contains an API for setting the current location based off some value collected by the GPS. I want to store this location in my class and later, change the behavior of my library if it is set.

What I had in mind was:

@interface myLib
{
@property (nonatomic, retain) CLLocationCoordinate2D *location;
}

@implementation myLib
{
@synthesize location = _location;

- (void)setLocation:(CLLocationCoordinate2D *)loc {
location = loc;
}

- (void)someFunc {
 if (location != nil) ...  
}

}

However, retain isn't a valid property for a CLLocationCoordinate2D object.

So, what is the proper way to save CLLocationCoordinate2D for later use w/o wasting memory?

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木格 2024-08-31 12:41:35

CLLocationCooperative2D 是一种非对象类型。它不是从 NSObject 继承的，因此不能被 retain ed。因此，像这样声明您的实例变量

CLLocationCoordinate2D location;

属性声明如下：

@property (nonatomic, assign) CLLocationCoordinate2D location;

然后您的 setLocation: 方法很简单：

- (void)setLocation:(CLLocationCoordinate2D)newLocation {
    location = newLocation;
    // other stuff
}

这个 setLocation: 方法也是可选的，因为合成的属性将分配给你。但是当分配新位置时，您似乎想做一些其他事情，所以这应该可以让您这样做。

CLLocationCoordinate2D is a non-object type. It does not inherit from NSObject so it cannot be retained. So declare your instance variable like so

CLLocationCoordinate2D location;

With the property declaration like:

@property (nonatomic, assign) CLLocationCoordinate2D location;

And then your setLocation: method is simply:

- (void)setLocation:(CLLocationCoordinate2D)newLocation {
    location = newLocation;
    // other stuff
}

This setLocation: method is also optional since the synthesized property will assign for you. But you seem to want to do some other stuff when a new location is assigned, so this should let you do that.

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