Ios – How to remove all annotations from MKMapView except the user location annotation

iosmkannotationmkmapviewuserlocationxcode

I use removeAnnotations to remove my annotations from mapView but same it remove user location ann. How can I prevent this, or how to get user ann back to view?

NSArray *annotationsOnMap = mapView.annotations;
        [mapView removeAnnotations:annotationsOnMap];

Best Answer

Update:

When I tried with the iOS 9 SDK the user annotation is no longer removed. You can simply use

mapView.removeAnnotations(mapView.annotations)

Historical answer (for apps that run on iOS before iOS 9):

Try this:

NSMutableArray * annotationsToRemove = [ mapView.annotations mutableCopy ] ;
[ annotationsToRemove removeObject:mapView.userLocation ] ;
[ mapView removeAnnotations:annotationsToRemove ] ;

EDIT: Swift version

let annotationsToRemove = mapView.annotations.filter { $0 !== mapView.userLocation }
mapView.removeAnnotations( annotationsToRemove )

Related Solutions

Iphone – How to remove all annotations from MKMapView without removing the blue dot

Looking at the MKMapView documentation, it seems like you have the annotations property to play with. It should be pretty simple to iterate through this and see what annotations you have :

for (id annotation in myMap.annotations) {
    NSLog(@"%@", annotation);
}

You also have the userLocation property which gives you the annotation representing the user's location. If you go through the annotations and remember all of them which are not the user location, you can then remove them using the removeAnnotations: method :

NSInteger toRemoveCount = myMap.annotations.count;
NSMutableArray *toRemove = [NSMutableArray arrayWithCapacity:toRemoveCount];
for (id annotation in myMap.annotations)
    if (annotation != myMap.userLocation)
        [toRemove addObject:annotation];
[myMap removeAnnotations:toRemove];

Hope this helps,

Sam

Ios – How to remove all subviews

Edit: With thanks to cocoafan: This situation is muddled up by the fact that NSView and UIView handle things differently. For NSView (desktop Mac development only), you can simply use the following:

[someNSView setSubviews:[NSArray array]];

For UIView (iOS development only), you can safely use makeObjectsPerformSelector: because the subviews property will return a copy of the array of subviews:

[[someUIView subviews]
 makeObjectsPerformSelector:@selector(removeFromSuperview)];

Thank you to Tommy for pointing out that makeObjectsPerformSelector: appears to modify the subviews array while it is being enumerated (which it does for NSView, but not for UIView).

Please see this SO question for more details.

Note: Using either of these two methods will remove every view that your main view contains and release them, if they are not retained elsewhere. From Apple's documentation on removeFromSuperview:

If the receiver’s superview is not nil, this method releases the receiver. If you plan to reuse the view, be sure to retain it before calling this method and be sure to release it as appropriate when you are done with it or after adding it to another view hierarchy.

Best Answer

Related Solutions

Iphone – How to remove all annotations from MKMapView without removing the blue dot

Ios – How to remove all subviews

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