MKViewAnnotation custom annotations losing order when added in MKMapView - objective-c

Question

I need to show on my MkMapView about 10 locations and respective custom annotations images (depending from the values loaded by a JSON parsing). As suggested in previous answers I have created a custom annotation class to store some data but, again, I cannot get the RIGHT ORDER: the custom images on each map locations don't respect the right sequence of respective parsed values, while in a UITableView its all perfect. This is the simplified code:
The example of correspondence:
if parsed valuesID is 100 ---> annotation image must be 100.png
if parsed valuesID is 200 ---> annotation image must be 200.png
if parsed valuesID is 300 ---> annotation image must be 300.png
The viewDidLoad method:
- (void)viewDidLoad
{
[super viewDidLoad];
map.showsUserLocation = true;
map.mapType = MKMapTypeStandard;
#define MakeLocation(lat,lon) [[CLLocation alloc] initWithLatitude:lat longitude:lon]
locations= #[ MakeLocation(lat1,lon1), MakeLocation(lat2,lon2), MakeLocation(lat3,lon3), MakeLocation(lat4,lon4), MakeLocation(lat5,lon5), MakeLocation(lat6,lon6), MakeLocation(lat7,lon7), MakeLocation(lat8,lon8), MakeLocation(lat9,lon9), MakeLocation(lat10,lon10) ];
}
The parseMethod called by a UIButton:
- (IBAction)parseMethod {
[map removeAnnotations:map.annotations];
// THE COMPLEX CODE TO PARSE VALUES of valuesID
...
... // so here I have the full array of valuesID
...
// THE CONTROL FOR THE END OF COMPLETE PARSING (blocks, cycle, ... )
[self addAnnotations]; // here i'm sure to call method AFTER THE END of complete parsing
}
The MyAnnotation2.h custom class:
#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>
#interface MyAnnotation2 : NSObject <MKAnnotation>
#property (nonatomic, assign) CLLocationCoordinate2D coordinate;
#property (nonatomic, assign) int valuesIDMyAnnotation2;
#end
The MyAnnotation2.m custom class:
#import "MyAnnotation2.h"
#implementation MyAnnotation2
#synthesize coordinate;
#synthesize valuesIDMyAnnotation2;
#end
The addAnnotations method (called AFTER the COMPLETE END of parsing):
- (void)addAnnotations {
[table reloadData]; // UITableView with rows populated with locations coordinates and respective valuesID
[table scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:YES];
for (int l=0; l<[locations count]; l++) {
annotation2 = [[MyAnnotation2 alloc] init]; // create MyAnnotation2 istance to assign custom properties
annotation2.valuesIDMyAnnotation2 = [[valuesID objectAtIndex:l] intValue];
annotation2.coordinate = [locations[l] coordinate];
[map addAnnotation: annotation2]; // here we call delegate with all necessary data to add annotations, both location coordinate and corresponding valuesID
NSLog(#"%d - COORDINATES: %f - %f",annotation2.valuesIDMyAnnotation2,annotation2.coordinate.latitude, annotation2.coordinate.longitude);
}
}
The UITableView delegate:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"Cell"];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:
UITableViewCellStyleSubtitle reuseIdentifier:#"Cell"];
}
cell.textLabel.text = [NSString stringWithFormat:#"%#",[coordinates objectAtIndex:indexPath.row]]; // here coordinates are values from each location
if ([[valuesID objectAtIndex:indexPath.row] intValue] == 100) {
UIImage *image = [UIImage imageNamed:#"100.png"];
[cell.imageView setImage:image];
}
if ([[valuesID objectAtIndex:indexPath.row] intValue] == 200) {
UIImage *image = [UIImage imageNamed:#"200.png"];
[cell.imageView setImage:image];
}
if ([[valuesID objectAtIndex:indexPath.row] intValue] == 300) {
UIImage *image = [UIImage imageNamed:#"300.png"];
[cell.imageView setImage:image];
}
return cell
}
Finally, the viewForAnnotation delegate:
- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation {
if ( ! [annotation isKindOfClass:[MyAnnotation2 class]])
{
((MKUserLocation *)annotation).title = #"My position";
return nil;
}
MKAnnotationView *pinView= [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:#"pinView"];
MyAnnotation2 *myPin = (MyAnnotation2 *)annotation;
if (myPin.valuesIDMyAnnotation2 == 100) {
pinView.image = [UIImage imageNamed:#"100.png"];
}
if (myPin.valuesIDMyAnnotation2 == 200) {
pinView.image = [UIImage imageNamed:#"200.png"];
}
if (myPin.valuesIDMyAnnotation2 == 300) {
pinView.image = [UIImage imageNamed:#"300.png"];
}
[pinView setFrame:CGRectMake(0, 0, 25, 25)];
return pinView;
}
EDIT - example of NSLogs results (code from addAnnotations method):
100 - COORDINATES lat1 - lon1 // here I expect annotation images100.png on location1
200 - COORDINATES lat2 - lon2 // ...
100 - COORDINATES lat3 - lon3
300 - COORDINATES lat4 - lon4
100 - COORDINATES lat5 - lon5
200 - COORDINATES lat6 - lon6
100 - COORDINATES lat7 - lon7
300 - COORDINATES lat8 - lon8
300 - COORDINATES lat9 - lon1
200 - COORDINATES lat10 - lon10
RESULTS:
On the UITableView its all PERFECT, I can see the right correspondence between locations coordinates and custom images, and also NSLog() gives the right correspondence of both location and valuesID. On the MKMapView, instead, custom annotation images are not added in the right sequence so I have right annotations images but in the wrong locations. Please, help me again to resolve this issue, thanks!

Answer 1

Put a break point on each of the pinView.image lines and when it is setting the image200.png, check what the coordinates are (you might need to NSLog them, I've never been great at digging deep in the debugger data). If you've got a mismatch there look through the rest of your code of anything else that could be changing the values of the locations, anything at all, and put a break point there. If that breakpoint gets triggered between the parseMethod and viewForAnnotation then you might have your culprit.