在iphone SDK中观察CLLocationCooperative2D

发布于 2024-08-04 00:34:04 字数 583 浏览 6 评论 0原文

在iPhone SDK中，我们是否只能观察对象，而不是像CLLocationCooperative2D那样的struts？

例子：我有一些非常简单的代码，我想在其中观察 CLLocationCooperative2D 类型的属性，我已确保在 ABC.m 中综合它。

@interface ABC
{
 CLLocationCoordinate2D currentLocation;
}
@property (nonatomic, readwrite) CLLocationCoordinate2D currentLocation;

现在，在另一个类中，我这样做：

[ABC addObserver:self forKeyPath:@"currentLocation" options:NSKeyValueObservingOptionNew context:NULL];

出于某种原因，observeValueForKeyPath 方法永远不会报告键路径“currentLocation”已更改。

谢谢，

Sjs

原文

In iPhone SDK, can we only observe Objects, and not struts like CLLocationCoordinate2D?

Example:
I've got some very simple code where I'd like to observe a property of type CLLocationCoordinate2D, I've made sure to synthesize it in ABC.m.

@interface ABC
{
 CLLocationCoordinate2D currentLocation;
}
@property (nonatomic, readwrite) CLLocationCoordinate2D currentLocation;

Now in another class I do:

[ABC addObserver:self forKeyPath:@"currentLocation" options:NSKeyValueObservingOptionNew context:NULL];

For some reason, the observeValueForKeyPath method never reports that keypath "currentLocation" changed.

Thanks,

Sjs

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梦醒灬来后我 2024-08-11 00:34:04

这就是你所说的字面意思吗？

[ABC addObserver:self forKeyPath:@"currentLocation" options:NSKeyValueObservingOptionNew context:NULL];

如果是这样，那么我认为问题在于您正在观察 ABC 类，而不是 ABC 类的实例。假设您有 ABC 类的一个实例，请尝试观察它。

ABC* myObject = [ [ [ ABC alloc ] init ] autorelease ];
[ myObject addObserver: self forKeyPath: @"currentLocation" options: NSKeyValueObservingOptionNew context: NULL ];

Is this the literal call that you make?

[ABC addObserver:self forKeyPath:@"currentLocation" options:NSKeyValueObservingOptionNew context:NULL];

If so then I think the issue is that you are observing the class ABC and not an instance of the class ABC. Assuming that you have an instance of class ABC try observing that.

ABC* myObject = [ [ [ ABC alloc ] init ] autorelease ];
[ myObject addObserver: self forKeyPath: @"currentLocation" options: NSKeyValueObservingOptionNew context: NULL ];

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