iOS SDK - MapKit MKAnnotationView問題 - 位置和多個註釋？

Question

進度太快，試圖學習MapKit和註解的進出。

我已經取得了一些很好的進展，但當我嘗試將位置服務添加到組合中時遇到問題。

如果我回到零到

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

方法，我變得非常接近我正在尋找一個結果，我有我的註釋針，我有我的用戶的位置在一個標準的顯示辦法。

但如果我回到myPins（有如下設置的所有參數），我得到正確的行爲上所有引腳但性能也爲用戶的位置集（這是一個紅色的每當視圖移動或選擇一個引腳時，它就會落入到位）。煩人。

如何設置註釋的屬性與位置分開？有沒有辦法返回多個MKAnnotationViews？我知道我錯過了一些基本概念，但希望你能給我提供任何幫助。提前致謝。

這裏是我的主要的viewController，總數：

// 
// ViewController.m 
// mapFun 
// 


#import "ViewController.h" 

@implementation ViewController 
@synthesize segmentedControl; 
@synthesize mapView,location, myLocations, myAnnotation, region; 

- (void)didReceiveMemoryWarning 
{ 
[super didReceiveMemoryWarning]; 
// Release any cached data, images, etc that aren't in use. 
} 

- (void)viewDidLoad 
{ 
[super viewDidLoad]; 

self.mapView.delegate = self; 

//location manager stuff 

CLLocationManager *locationManager = [[CLLocationManager alloc] init]; 
[locationManager setDelegate:self]; 
[locationManager setDistanceFilter:kCLDistanceFilterNone]; 
[locationManager setDesiredAccuracy:kCLLocationAccuracyBest]; 

if([CLLocationManager locationServicesEnabled]) 
{ 
[self.mapView setShowsUserLocation:YES]; 
[locationManager startUpdatingHeading]; 
} 

[self loadUpLocations]; 

//set first zoom center and span, to zoom from to initial zoom 

region.center=CLLocationCoordinate2DMake(
             33.75070416856952, 
             -84.37034368515015); 
MKCoordinateSpan span; 
span.latitudeDelta=.3; 
span.longitudeDelta=.3; 
region.span=span; 

[mapView setRegion:region animated:YES]; 

} 

- (void)viewDidUnload 
{ 
[self setMapView:nil]; 
[self setSegmentedControl:nil]; 
[super viewDidUnload]; 
// Release any retained subviews of the main view. 
// e.g. self.myOutlet = nil; 
} 

- (void)viewWillAppear:(BOOL)animated 
{ 
[super viewWillAppear:animated]; 
} 

- (void)viewDidAppear:(BOOL)animated 
{ 
[super viewDidAppear:animated]; 

//zoom to initial zoom 
[self setInitialZoom]; 
} 

- (void)viewWillDisappear:(BOOL)animated 
{ 
[super viewWillDisappear:animated]; 
} 

- (void)viewDidDisappear:(BOOL)animated 
{ 
[super viewDidDisappear:animated]; 
} 

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{ 
// Return YES for supported orientations 
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown); 
} 

//Load up a buncha locations 

-(void)loadUpLocations{ 

myLocations = [LoadObjectsFromFile loadFromFile:@"locations2" ofType:@"plist"]; 

//loop through and make annotations 

for (NSString *loc in myLocations) { 
    NSDictionary *value =[myLocations objectForKey:loc]; 

    //create instance of MapAnnotations 
    CLLocationCoordinate2D temp = 
    CLLocationCoordinate2DMake(
           [[value objectForKey:@"latitude"] doubleValue], 
           [[value objectForKey:@"longitude"] doubleValue]); 

    myAnnotation = [[MapAnnotations alloc]initWithLocation:temp]; 
    myAnnotation.title = [value objectForKey:@"title"]; 
    myAnnotation.subtitle = [value objectForKey:@"subtitle"]; 
    myAnnotation.info =[value objectForKey:@"info"]; 

    [self.mapView addAnnotation:myAnnotation]; 

} 
} 

- (void)setInitialZoom{ 

// MKCoordinateRegion region; 
region.center = CLLocationCoordinate2DMake(33.77, -84.37); 

//set level of zoom 
MKCoordinateSpan span; 
span.latitudeDelta=.04; 
span.longitudeDelta=.04; 
region.span=span; 
[mapView setRegion:region animated:YES]; 
} 

// used when selecting annotations 

- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view{ 

MKPointAnnotation *selectedAnnotation = view.annotation; 

NSLog(@"The annotation selected is %@.",selectedAnnotation.title); 

//set level of zoom 
CLLocationCoordinate2D newCenter = 
CLLocationCoordinate2DMake(
          selectedAnnotation.coordinate.latitude, 
          selectedAnnotation.coordinate.longitude); 
MKCoordinateSpan span; 
span.latitudeDelta=.02; 
span.longitudeDelta=.02; 
MKCoordinateRegion zoomRegion = MKCoordinateRegionMake(newCenter, span); 

[ self.mapView setRegion:zoomRegion animated:YES]; 

} 

- (void)mapView:(MKMapView *)mapView didDeselectAnnotationView:(MKAnnotationView *)view 
{ 
// [self zoomOutToInitial:nil]; 
} 

- (IBAction)zoomOutToInitial:(id)sender { 

[self.mapView setRegion:region animated:YES]; 
} 

- (IBAction)segChanged:(id)sender { 
if (self.segmentedControl.selectedSegmentIndex==0) { 
    [self.mapView setMapType:MKMapTypeStandard]; 
} 
if (self.segmentedControl.selectedSegmentIndex==1) { 
    [self.mapView setMapType:MKMapTypeSatellite]; 
} 
if (self.segmentedControl.selectedSegmentIndex==2) { 
    [self.mapView setMapType:MKMapTypeHybrid]; 
} 
} 

// This gets called every time an annotation is in the map view 

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation 
{ 
NSLog(@"Map view can see annotation %@.",annotation.title); 
MKPinAnnotationView *myPins; 
if (!myPins) { 
    myPins= [[MKPinAnnotationView alloc]initWithAnnotation:self.myAnnotation 
            reuseIdentifier:@"myPins"]; 
} 

myPins.animatesDrop = YES; 
myPins.canShowCallout = YES; 
myPins.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure]; 

return nil; 
//return myPins; 
} 

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation 
{ 
[manager stopUpdatingHeading]; 
} 
@end 

---

回答我的問題。不管怎麼說，還是要謝謝你。

我終於從蘋果找到了答案中稱爲有用文件「Location Awareness Programming Guide」。

這裏的修正 MKAnnotationView方法：

// This gets called every time an annotation is in the map view 

- (MKAnnotationView *)mapView:(MKMapView *)theView 
      viewForAnnotation:(id <MKAnnotation>)annotation 
{ 
    NSLog(@"Map view can see annotation %@.",annotation.title); 

    //if the annotation is a user location 
    if ([annotation isKindOfClass:[MKUserLocation class]]) { 
     return nil; 
    } 

//uses my custom class 

if ([annotation isKindOfClass:[MapAnnotations class]]) { 

    // try for reuse of pins 

    MKPinAnnotationView *myPins = (MKPinAnnotationView *) 
       [theView dequeueReusableAnnotationViewWithIdentifier:@"myPins"]; 

    if (!myPins) { 

      myPins= [[MKPinAnnotationView alloc]initWithAnnotation:annotation 
                reuseIdentifier:@"myPins"]; 
      myPins.animatesDrop = YES; 
      myPins.canShowCallout = YES; 
      myPins.rightCalloutAccessoryView = 
      [UIButton buttonWithType:UIButtonTypeDetailDisclosure]; 

     }else 
      myPins.annotation = annotation; 
     return myPins; 
    } 
    return nil; 
} 

Answer 1

的基本概念是返回當且僅當問觀點實際上是用戶位置視圖。 您只需測試轉發給您的註釋是否屬於用戶位置類，如下所示：

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation 
{ 
    if ([annotation isKindOfClass:[MKUserLocation class]]) 
        return nil; 
// do your usual stuff 
}