iPhone：创建MKAnnotation

问题描述

我可以创建 MKAnnotation ，还是只读？我有坐标，但我发现使用 setCoordinate 手动创建 MKAnnotation 并不容易。

Can I create an MKAnnotation, or is it read only? I have coordinates, but I am not finding it easy to manually create an MKAnnotation with using setCoordinate.

想法？

推荐答案

是一种协议。因此，您需要编写自己的实现此协议的注释对象。所以你的MyAnnotation标题如下所示：

MKAnnotation is a protocol. So you need to write your own annotation object that implements this protocol. So your MyAnnotation header looks like:

@interface MyAnnotation : NSObject<MKAnnotation> {
    CLLocationCoordinate2D coordinate;
}

@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;

// add an init method so you can set the coordinate property on startup
- (id) initWithCoordinate:(CLLocationCoordinate2D)coord;

您的实现看起来像（MyAnnotation.m）：

and your implementation looks like (MyAnnotation.m):

- (id) initWithCoordinate:(CLLocationCoordinate2D)coord
{
    coordinate = coord;
    return self;
}

所以要将注释添加到地图中：

So to add your annotation to the map:

MyAnnotation * annotation = [[[MyAnnotation alloc] initWithCoordinate:coordinate] autorelease];
[self.mapView addAnnotation:annotation];

如果您不想在注释标注上添加标题和副标题，则需要添加标题和字幕属性。

If you wan't a title and subtitle on the annotation callout, you need to add the title and subtitle properties.

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