的MKMapView没有显示注释的点

我想表明我的当前位置的位置，并随机5分点是这样的：的MKMapView没有显示注释的点

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    locationManager.delegate = self; 
    locationManager.desiredAccuracy = kCLLocationAccuracyBest; 

    [locationManager startUpdatingLocation]; 
    otherlat = [NSNumber numberWithDouble:[currentLatitude doubleValue]]; 
    otherlong = [NSNumber numberWithDouble:[currentLongitude doubleValue]]; 

    [self.mapView setShowsUserLocation:YES]; 
    mapView.delegate = self; 

    longi = [[NSMutableArray alloc] init]; 
    lati = [[NSMutableArray alloc] init]; 

    NSMutableArray *la = [[NSMutableArray alloc] init]; 
    NSMutableArray *lo = [[NSMutableArray alloc] init]; 
    la = [NSMutableArray arrayWithObjects:@"20", @"21", @"42", @"51", @"75", nil]; 
    lo = [NSMutableArray arrayWithObjects:@"60", @"21", @"82", @"181", @"35", nil]; 

    for (int x = 0; x < [la count]; x++) { 
     otherlat = [NSNumber numberWithDouble:[[la objectAtIndex:x] doubleValue]]; 
     otherlong = [NSNumber numberWithDouble:[[lo objectAtIndex:x] doubleValue]]; 
     [longi addObject:otherlong]; 
     [lati addObject:otherlat]; 
    } 

    myAnnotation *myAnnotation1 = [[myAnnotation alloc] init]; 
    for (int y = 0; y < [lati count]; y++) { 
     CLLocationCoordinate2D theCoordinate; 
     theCoordinate.latitude = [[lati objectAtIndex:y] doubleValue]; 
     theCoordinate.longitude = [[longi objectAtIndex:y] doubleValue]; 

     myAnnotation1.coordinate = theCoordinate; 
     [mapView addAnnotation:myAnnotation1]; 
    } 
} 

- (MKAnnotationView *)mapView:(MKMapView *)theMapView viewForAnnotation:(id <MKAnnotation>)annotation { 
    if ([annotation isKindOfClass:[MKUserLocation class]]) 
    return nil; 

    static NSString *myAnnotationIdentifier = @"AnnotationIdentifier"; 
    MKPinAnnotationView *customPinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:myAnnotationIdentifier]; 
    customPinView.image = [UIImage imageNamed:@"purplepin.png"]; 
    customPinView.animatesDrop = YES; 
    customPinView.canShowCallout = YES; 

    return customPinView; 
}

不过，MapView的只显示我的当前位置，并且没有的其他5个地点。我不明白为什么它不显示其他5个位置，因为我做的是

[mapView addAnnotation:myAnnotation1];

来源

2013-05-19 Alexyuiop

关键问题，将注释分配/初始化内部'for'循环。您的经度也不能超过180.0。你可以显着简化你的数组逻辑。你的viewForAnnotation'应该使用'customPinView.pinColor = MKPinAnnotationColorPurple'而不是png。你的'viewForAnnotation'实际上应该在创建一个新的''dequeueReusableAnnotationViewWithIdentifier'之前尝试。如果您未在注释中设置“标题”属性等，则无需显示标注。 – Rob

谢谢您的建议 – Alexyuiop

您只添加1个注释。你做了5次，但你总是覆盖以前的坐标。

//only 1 is allocated and then used/modified in every iteration of the loop! 
myAnnotation* myAnnotation1=[[myAnnotation alloc] init]; 
for (int y =0; y < [lati count]; y++) { 
    ....

你需要创建不是1 myAnnotation1，但..... 5分不同的人：

//allocate & add in each iteration of the loop! 
for (int y =0; y < [lati count]; y++) { 
    myAnnotation* myAnnotation1=[[myAnnotation alloc] init]; 
    ....

来源

2013-05-19 02:15:12

的MKMapView没有显示注释的点

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