Ios MapKit注释显示在一个视图控制器中，而不显示在另一个视图控制器中

在我的浏览视图控制器中，将显示地图工具包注释。

_mapVC = [[CollectionMapViewController alloc] init];
mapVC.collectedLeafArray = [collectionFetchedResultsController fetchedObjects];
    mapVC.canShowCallout = YES;
    mapVC.delegate = self;
    [mapVC layoutMapView];
    [self addChildViewController:mapVC];
    [self.view insertSubview:mapVC.view belowSubview:_userCollectionSortMenu.view];

    [mapVC didMoveToParentViewController:self];

 _mapVC = [[CollectionMapViewController alloc] init];
    _mapVC.collectedLeafArray = [NSArray arrayWithObject:_collectedLeaf];
    _mapVC.delegate = self;
    _mapVC.canShowCallout = NO;
    [_mapVC layoutMapView];

    [self addChildViewController:_mapVC];
    [_scrollView addSubview:_mapVC.view]; 
    [_mapVC didMoveToParentViewController:self];

我设置子视图控制器的方式与设置笔记视图控制器的方式完全相同。但是，它们不会显示注释PIN。

_mapVC = [[CollectionMapViewController alloc] init];
mapVC.collectedLeafArray = [collectionFetchedResultsController fetchedObjects];
    mapVC.canShowCallout = YES;
    mapVC.delegate = self;
    [mapVC layoutMapView];
    [self addChildViewController:mapVC];
    [self.view insertSubview:mapVC.view belowSubview:_userCollectionSortMenu.view];

    [mapVC didMoveToParentViewController:self];

 _mapVC = [[CollectionMapViewController alloc] init];
    _mapVC.collectedLeafArray = [NSArray arrayWithObject:_collectedLeaf];
    _mapVC.delegate = self;
    _mapVC.canShowCallout = NO;
    [_mapVC layoutMapView];

    [self addChildViewController:_mapVC];
    [_scrollView addSubview:_mapVC.view]; 
    [_mapVC didMoveToParentViewController:self];

我知道收集的叶不是零，因为我在设置注释的

CollectionMapViewController

方法中检查纬度：

- (void)layoutMapView
{
    NSMutableArray* leavesWithValidGeotag = [[NSMutableArray alloc] initWithCapacity:[collectedLeafArray count]];

    for (CollectedLeaf* collectedLeaf in collectedLeafArray)
    {
        NSLog(@"latitude: %@", collectedLeaf.latitude);
        if ( ![collectedLeaf.latitude isEqualToString:kGeoLocationNotAvailable] )
        {
            [leavesWithValidGeotag addObject:collectedLeaf];
            LeafAnnotation* annotation = [[LeafAnnotation alloc] initWithLeaf:collectedLeaf];
            [mapView addAnnotation:annotation];
            [annotation release];
        }
    }

    //// Adjust the region

    if([leavesWithValidGeotag count] > 1)
    {
        NSArray* westEastSort = [leavesWithValidGeotag sortedArrayUsingSelector:@selector(longitudeCompare:)];
        CollectedLeaf* eastMostLeaf = [westEastSort objectAtIndex:0];
        CollectedLeaf* westMostLeaf = [westEastSort lastObject];

        NSArray* southNorthSort = [leavesWithValidGeotag sortedArrayUsingSelector:@selector(latitudeCompare:)];
        CollectedLeaf* southMostLeaf = [southNorthSort objectAtIndex:0];
        CollectedLeaf* northMostLeaf = [southNorthSort lastObject];

        CLLocationCoordinate2D center;
        center.longitude = ([westMostLeaf.longitude doubleValue] + [eastMostLeaf.longitude doubleValue]) / 2.0f;
        center.latitude = ([southMostLeaf.latitude doubleValue] + [northMostLeaf.latitude doubleValue]) / 2.0f;

        MKCoordinateSpan span = MKCoordinateSpanMake(1.5 * fabs([northMostLeaf.latitude doubleValue] - [southMostLeaf.latitude doubleValue]),
                                                     1.5 * fabs([westMostLeaf.longitude doubleValue] - [eastMostLeaf.longitude doubleValue]));

        if ( span.latitudeDelta < kMinimumSpan )
        {
            span.latitudeDelta = kMinimumSpan;
        }
        if ( span.longitudeDelta < kMinimumSpan )
        {
            span.longitudeDelta = kMinimumSpan;
        }

        MKCoordinateRegion region = MKCoordinateRegionMake(center, span);
        [mapView setRegion:region];
    }

    else if([leavesWithValidGeotag count] == 1)
    {
        CollectedLeaf* theLeaf = [leavesWithValidGeotag objectAtIndex:0];
        CLLocationCoordinate2D center;
        center.longitude = [theLeaf.longitude doubleValue];
        center.latitude = [theLeaf.latitude doubleValue];
        MKCoordinateSpan span = MKCoordinateSpanMake(kMinimumSpan, kMinimumSpan);
        MKCoordinateRegion region = MKCoordinateRegionMake(center, span);
        [mapView setRegion:region];
    }

    [leavesWithValidGeotag release];
}

-（无效）布局映射视图
{
NSMutableArray*LeaveSwithValidGetAg=[[NSMutableArray alloc]initWithCapacity:[collectedLeafArray count]]；
for（CollectedLeaf*CollectedLeaf在CollectedLeaf数组中）
{
NSLog（@“纬度：%@”，collectedLeaf.latitude）；
如果（！[collectedLeaf.latitude为相等字符串：kGeoLocationNotAvailable]）
{
[LeaveSwithValidGetAg添加对象：collectedLeaf]；
LeafAnnotation*annotation=[[LeafAnnotation alloc]initWithLeaf:collectedLeaf]；
[地图视图添加注释：注释]；
[注释发布]；
}
}
////调整区域
如果（[LeaveSwithValidGetAg计数]>1）
{
NSArray*westEastSort=[LeaveSwithValidGetAg-SortedArray使用选择器：@selector（纵向比较：）]；
CollectedLeaf*eastMostLeaf=[westEastSort对象索引：0]；
CollectedLeaf*westMostLeaf=[westEastSort lastObject]；
NSArray*southNorthSort=[LeaveSwithValidgeToTag SortedArray使用选择器：@selector（latitudeCompare:）]；
CollectedLeaf*southMostLeaf=[southNorthSort objectAtIndex:0]；
CollectedLeaf*northMostLeaf=[southNorthSort lastObject]；
位置协调中心；
center.longitude=（[westMostLeaf.longitude doubleValue]+[eastMostLeaf.longitude doubleValue]）/2.0f；
中心纬度=（[southMostLeaf.latitude doubleValue]+[northMostLeaf.latitude doubleValue]）/2.0f；
MKCoordinateSpan span=MKCoordinateSpanMake（1.5*fabs（[northMostLeaf.latitude doubleValue]-[southMostLeaf.latitude doubleValue]），
1.5*晶圆厂（[westMostLeaf.经度双值]-[eastMostLeaf.经度双值]）；
如果（span.latitudeDelta

也许，您需要复制NSArray对象

NSArray *test1 = [NSArray arrayWithObject:_collectedLeaf];
_mapVC.collectedLeafArray = [test1 copy];