如何知道MKMapview setRegion:animated:何时完成？
如何知道MKMapview setRegion:animated:何时完成？
提问于 2010-01-18 03:19:00
我想在我的MKMapView上设置一个区域，然后找到与地图的NE和SW角相对应的坐标。
This code works just fine to do that:
//Recenter and zoom map in on search location
MKCoordinateRegion region = {{0.0f, 0.0f}, {0.0f, 0.0f}};
region.center = mySearchLocation.searchLocation.coordinate;
region.span.longitudeDelta = 0.01f;
region.span.latitudeDelta = 0.01f;
[self.mapView setRegion:region animated:NO]; //When this is set to YES it seems to break the coordinate calculation because the map is in motion
//After the new search location has been added to the map, and the map zoomed, we need to update the search bounds
//First we need to calculate the corners of the map so we get the points
CGPoint nePoint = CGPointMake(self.mapView.bounds.origin.x + mapView.bounds.size.width, mapView.bounds.origin.y);
CGPoint swPoint = CGPointMake((self.mapView.bounds.origin.x), (mapView.bounds.origin.y + mapView.bounds.size.height));
//Then transform those point into lat,lng values
CLLocationCoordinate2D neCoord;
neCoord = [mapView convertPoint:nePoint toCoordinateFromView:mapView];
CLLocation *neLocation = [[CLLocation alloc] initWithLatitude:neCoord.latitude longitude:neCoord.longitude];
CLLocationCoordinate2D swCoord;
swCoord = [mapView convertPoint:swPoint toCoordinateFromView:mapView];
CLLocation *swLocation = [[CLLocation alloc] initWithLatitude:swCoord.latitude longitude:swCoord.longitude];问题是我希望地图的缩放是动画的。但是，当我将setRegion:animated设置为YES时，我最终会在地图缩小时(即在动画完成之前)从地图中获取坐标。有没有办法得到动画完成的信号？
回答 1
Stack Overflow用户
发布于 2016-07-30 08:23:30
我知道这很古老，但以防其他人来寻找答案，这里有一个替代方案。
这个版本的好处是，你可以在第一个完成的时刻运行完成动画，而不是在回调方法中猜测/硬编码它，因为那个回调方法会立即被调用。
[MKMapView animateWithDuration:1.0 animations:^{
[mapView setRegion:mapRegion animated:YES];
} completion:^(BOOL finished) {
[UIView animateWithDuration:1.0 animations:^{
self.mapDotsImageView.alpha = 1.0;
}];
}];或者只是
// zoom in...
let km3:CLLocationDistance = 3000
let crTight = MKCoordinateRegionMakeWithDistance(location.coordinate, km3, km3)
MKMapView.animate(withDuration: 1.0, animations: { self.theMap.region = crTight })页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/2082269
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