iOS：加载MKMapView并添加注释/叠加层时的通知？ [英] iOS: Notification when MKMapView is loaded and annotations/overlays are added?

问题描述

我知道用于在加载地图并添加注释和叠加层时告知我的委托方法。 （ mapViewDidFinishLoadingMap： mapView：didAddAnnotationViews： mapView：didAddOverlayViews： ）

I am aware of the delegate methods used to let me know when the map has loaded and annotations and overlays have been added. (mapViewDidFinishLoadingMap: mapView:didAddAnnotationViews: mapView:didAddOverlayViews:)

我想从我的 MKMapView UIImage c>一旦所有东西都装满了。目前我创建 UIImage 一旦 mapView：didAddOverlayViews：被调用，但这并不总是可靠的，因为有时候叠加需要更长的时间来添加，有时 mapViewDidFinishLoadingMap：被多次调用或加载需要很长时间。有时它不会被调用，因为瓷砖是缓存的。因此，很难确切知道什么时候加载了。我尝试过使用计时器，但这也不能让它变得可靠。

I am wanting to create a UIImage from my MKMapView once everything has loaded. Currently I am creating my UIImage once mapView:didAddOverlayViews: is called, but this is not always reliable, because sometimes the overlay take longer to be added, sometimes mapViewDidFinishLoadingMap: is called more than once or it takes a long time to load. Sometimes it is NOT called because tiles are cached. So, it is very hard to know exactly when everything has loaded. I have tried using a timer but that doesn't make it reliable either.

我的问题是，我怎么知道什么时候已经完全加载，包括所有地图图块，所有注释和所有叠加层？

推荐答案

这是一个老问题，但如果您使用的是iOS 7只需使用mapView mapViewDidFinishRenderingMap委托。

It's an old question, but if you're using iOS 7 just use the mapView mapViewDidFinishRenderingMap delegate.

- (void)mapViewDidFinishRenderingMap:(MKMapView *)mapView fullyRendered:(BOOL)fullyRendered
{
    // Image creation code here

}

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