MKPlacemark 类的实例 0x1d58be70 被释放

Question

当我尝试使用 MKPlacemark 使用此代码在地图视图上添加注释时：

for(int i = 0; i < [array count]; i++){
        UsersModel *model = [array objectAtIndex:i];

        CLLocationCoordinate2D newCoordinate;
        newCoordinate.latitude = model.coordinate.latitude;
        newCoordinate.longitude = model.coordinate.longitude;

        NSLog(@"%f",model.coordinate.latitude);
        NSLog(@"%f",model.coordinate.longitude);

        //mPlaceMark = [[MKPlacemark alloc] initWithCoordinate:newCoordinate addressDictionary:nil];

        MKPlacemark *placeMark = [[MKPlacemark alloc] initWithCoordinate:newCoordinate addressDictionary:nil];

        //[self.mapView addAnnotation:mPlaceMark];
        [self.mapView addAnnotation:placeMark];
        //[placeMark retain];
        NSLog(@"%@", self.mPlaceMark);
    }

然后它在我的控制台上出现错误：

An instance 0x1d58be70 of class MKPlacemark was deallocated while key value observers were still registered with it. Observation info was leaked, and may even become mistakenly attached to some other object. Set a breakpoint on NSKVODeallocateBreak to stop here in the debugger. Here's the current observation info:
<NSKeyValueObservationInfo 0x1d53de10> (
<NSKeyValueObservance 0x1d58af30: Observer: 0x1d576690, Key path: coordinate, Options: <New: NO, Old: NO, Prior: YES> Context: 0x0, Property: 0x1d58af90>
)

Answer 1

看来，你忘了删除一些观察者。尝试在您的课程dealloc 方法中使用此代码。

 for (id <MKAnnotation> annotation in self.mapView.annotations)
 {
      [[self.mapView viewForAnnotation:annotation] removeObserver:self]; // NOTE: remove ALL observer!
 }

您还应该记住nil您的地图代表：

 self.mapView.delegate = nil;