Objective c ios:MapView Pin颜色注释不断变化；为什么？

你好，谢谢你的帮助

我正在使用以下代码设置MapView注释上的pin颜色

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {




    MKPinAnnotationView *pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:@"pinView"];
    if (!pinView) {

        //////////////
        pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"pinView"];
        pinView.pinColor = MKPinAnnotationColorGreen;
        if([[annotation title] isEqualToString:@"MuRoom"])
        {
            // Do somethingMKAnnotation
            pinView.pinColor = MKPinAnnotationColorRed;

            NSLog( @"data from ann index %@", annTile);
        }
        if([[annotation title] isEqualToString:@"Mike's"])
        {
            // Do somethingMKAnnotation
            pinView.pinColor = MKPinAnnotationColorRed;

            NSLog( @"data from ann index %@", annTile);
        }
        if([[annotation title] isEqualToString:@"Bill's"])
        {
            // Do somethingMKAnnotation
            pinView.pinColor = MKPinAnnotationColorPurple;

            NSLog( @"data from ann index %@", annTile);
        }
        if([[annotation title] isEqualToString:@"Steve's"])
        {
            // Do somethingMKAnnotation
            pinView.pinColor = MKPinAnnotationColorGreen;

            NSLog( @"data from ann index %@", annTile);
        }
        if([[annotation title] isEqualToString:@"Louisa's"])
        {
            // Do somethingMKAnnotation
            pinView.pinColor = MKPinAnnotationColorGreen;

            NSLog( @"data from ann index %@", annTile);
        }


        pinView.animatesDrop = YES;
        pinView.canShowCallout = YES;

        UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
        pinView.rightCalloutAccessoryView = rightButton;
    } else {
        pinView.annotation = annotation;
    }
    return pinView;
}


I am then using the function below to filter my pins locaions



-(void)FilterAddAll:(id)sender
{
    [mapview removeAnnotations:annoArra];
    [mapview removeAnnotations:annoArrayVenue];
 [mapview removeAnnotations:artArray];


//    CLLocationCoordinate2D center = mapview.centerCoordinate;
//    mapview.centerCoordinate = center;


    [mapview addAnnotations:annoArra];
    [mapview addAnnotations:annoArrayVenue];
    [mapview addAnnotations:artArray];

}

-(void)FilterArt:(id)sender
{
    [mapview removeAnnotations:annoArra];
    [mapview removeAnnotations:artArray];
    [mapview removeAnnotations:annoArrayVenue];

    [mapview addAnnotations:annoArra];
}

-(void)FilterVenue:(id)sender
{
    [mapview removeAnnotations:annoArra];
    [mapview removeAnnotations:artArray];
    [mapview removeAnnotations:annoArrayVenue];

    [mapview addAnnotations:artArray];
}

-（MKAnnotationView*）地图视图：（MKMapView*）地图视图注释：（id）注释{
MKPinAnnotationView*pinView=（MKPinAnnotationView*）[mapView出列可重用的AnnotationViewWith Identifier:@“pinView]”；
如果（！pinView）{
//////////////
pinView=[[MKPinAnnotationView alloc]initWithAnnotation:annotation重用标识符：@“pinView”]；
pinView.pinColor=MKPinAnnotationColorGreen；
if（[[annotation title]isEqualToString:@“MuRoom”]）
{
//做点什么
pinView.pinColor=MKPinAnnotationColorRed；
NSLog（@“来自ann索引的数据%@”，annTile）；
}
如果（[[annotation title]isEqualToString:@“Mike's”]）
{
//做点什么
pinView.pinColor=MKPinAnnotationColorRed；
NSLog（@“来自ann索引的数据%@”，annTile）；
}
如果（[[annotation title]IsequalString:@“Bill's”]）
{
//做点什么
pinView.pinColor=MKPinAnnotationColorPurple；
NSLog（@“来自ann索引的数据%@”，annTile）；
}
如果（[[annotation title]isEqualToString:@“Steve's”]）
{
//做点什么
pinView.pinColor=MKPinAnnotationColorGreen；
NSLog（@“来自ann索引的数据%@”，annTile）；
}
如果（[[annotation title]isEqualToString:@“Louisa's”]）
{
//做点什么
pinView.pinColor=MKPinAnnotationColorGreen；
NSLog（@“来自ann索引的数据%@”，annTile）；
}
pinView.animatesDrop=是；
pinView.canShowCallout=是；
UIButton*rightButton=[UIButton Button类型：UIButtonTypedTailButton]；
pinView.rightCalloutAccessoryView=rightButton；
}否则{
pinView.annotation=注释；
}
返回pinView；
}
然后，我使用下面的功能过滤我的PIN位置
-（无效）筛选器全部：（id）发件人
{
[地图视图删除注释：annoArra]；
[地图视图删除说明：AnnoarRay场馆]；
[mapview removeAnnotations:artArray]；
//CLLocationCoordinate2D center=mapview.centerCoordinate；
//mapview.centerCoordinate=中心；
[地图视图添加注释：annoArra]；
[地图视图添加注释：annoArrayVenue]；
[mapview addAnnotations:artArray]；
}
-（无效）筛选器art:（id）发件人
{
[地图视图删除注释：annoArra]；
[mapview removeAnnotations:artArray]；
[地图视图删除说明：AnnoarRay场馆]；
[地图视图添加注释：annoArra]；
}
-（void）FilterVenue:（id）发送方
{
[地图视图删除注释：annoArra]；
[mapview removeAnnotations:artArray]；
[地图视图删除说明：AnnoarRay场馆]；
[mapview addAnnotations:artArray]；
}

问题：如何使pin颜色保持其原始颜色？在我过滤后，它们以随机针颜色的形式返回

---

再次感谢。

出现这种情况是因为您没有正确使用“reuseIdentifier”。当您从dequeueReusableAnnotationViewWithIdentifier:@“pinView”获取pin时，您需要：

始终设置pin颜色，或 对每个彩色pin使用不同的reuseIdentifier

i、 e.您可能会得到一个带有红色图钉的可重用视图，并且希望显示一个蓝色图钉

例如：

MKPinAnnotationView *pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:@"pinView"];
    if (!pinView) {

        //////////////
        pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"pinView"];

        pinView.animatesDrop = YES;
        pinView.canShowCallout = YES;

        UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
        pinView.rightCalloutAccessoryView = rightButton;
    } else {
        pinView.annotation = annotation;
    }

// SET THE PIN COLOR REGARDLESS OF WHETHER A REUSABLE ANNOTATION WAS RETURNED OR NOT

        pinView.pinColor = MKPinAnnotationColorGreen;
        if([[annotation title] isEqualToString:@"MuRoom"])
        {
            // Do somethingMKAnnotation
            pinView.pinColor = MKPinAnnotationColorRed;

            NSLog( @"data from ann index %@", annTile);
        }
        if([[annotation title] isEqualToString:@"Mike's"])
        {
            // Do somethingMKAnnotation
            pinView.pinColor = MKPinAnnotationColorRed;

            NSLog( @"data from ann index %@", annTile);
        }
        if([[annotation title] isEqualToString:@"Bill's"])
        {
            // Do somethingMKAnnotation
            pinView.pinColor = MKPinAnnotationColorPurple;

            NSLog( @"data from ann index %@", annTile);
        }
        if([[annotation title] isEqualToString:@"Steve's"])
        {
            // Do somethingMKAnnotation
            pinView.pinColor = MKPinAnnotationColorGreen;

            NSLog( @"data from ann index %@", annTile);
        }
        if([[annotation title] isEqualToString:@"Louisa's"])
        {
            // Do somethingMKAnnotation
            pinView.pinColor = MKPinAnnotationColorGreen;

            NSLog( @"data from ann index %@", annTile);
        }

---

这是因为您没有正确使用“reuseIdentifier”。当您从dequeueReusableAnnotationViewWithIdentifier:@“pinView”获取pin时，您需要：

始终设置pin颜色，或 对每个彩色pin使用不同的reuseIdentifier

i、 e.您可能会得到一个带有红色图钉的可重用视图，并且希望显示一个蓝色图钉

例如：

MKPinAnnotationView *pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:@"pinView"];
    if (!pinView) {

        //////////////
        pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"pinView"];

        pinView.animatesDrop = YES;
        pinView.canShowCallout = YES;

        UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
        pinView.rightCalloutAccessoryView = rightButton;
    } else {
        pinView.annotation = annotation;
    }

// SET THE PIN COLOR REGARDLESS OF WHETHER A REUSABLE ANNOTATION WAS RETURNED OR NOT

        pinView.pinColor = MKPinAnnotationColorGreen;
        if([[annotation title] isEqualToString:@"MuRoom"])
        {
            // Do somethingMKAnnotation
            pinView.pinColor = MKPinAnnotationColorRed;

            NSLog( @"data from ann index %@", annTile);
        }
        if([[annotation title] isEqualToString:@"Mike's"])
        {
            // Do somethingMKAnnotation
            pinView.pinColor = MKPinAnnotationColorRed;

            NSLog( @"data from ann index %@", annTile);
        }
        if([[annotation title] isEqualToString:@"Bill's"])
        {
            // Do somethingMKAnnotation
            pinView.pinColor = MKPinAnnotationColorPurple;

            NSLog( @"data from ann index %@", annTile);
        }
        if([[annotation title] isEqualToString:@"Steve's"])
        {
            // Do somethingMKAnnotation
            pinView.pinColor = MKPinAnnotationColorGreen;

            NSLog( @"data from ann index %@", annTile);
        }
        if([[annotation title] isEqualToString:@"Louisa's"])
        {
            // Do somethingMKAnnotation
            pinView.pinColor = MKPinAnnotationColorGreen;

            NSLog( @"data from ann index %@", annTile);
        }

---

无知的迷雾正在慢慢消散。再次感谢。无知的迷雾正在慢慢消散。再次感谢。