Issue with map annotation and MKMapView in iOS 4.2?

Question

I have a map view with pins, when the user selects a contact, he goes to the detailed screen for this output. I also have a table view that when a user selects an item, he goes to a detailed view of the same type.

Here's the problem ...

Everything seems to work fine from 3.1.3 to 4.1. That is, a layout with matching points. But I have a user who has just upgraded to iOS 4.2 and says that under 4.1 it worked fine, but in 4.2 the pin selection displays it on the part for another pin. But the table view still works fine.

Is it possible that in iOS 4.2 there was a change in MKMapView that changes the way pinID is selected?

Addition - I added the corresponding parts of viewForAnnotation and checkButtonTapped

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

int postTag = 0;

MKPinAnnotationView *pinView = (MKPinAnnotationView *)[eMapView dequeueReusableAnnotationViewWithIdentifier:@"Pin"];

if(pinView == nil) {

    pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"Pin"];
    pinView.frame = CGRectMake(0, 0, 25, 25);

} else {

    pinView.annotation = annotation;

}   

// Set up the Right callout
UIButton *myDetailButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
myDetailButton.frame = CGRectMake(0, 0, 23, 23);
myDetailButton.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
myDetailButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;

[myDetailButton addTarget:self action:@selector(checkButtonTapped:) forControlEvents:UIControlEventTouchUpInside];

// Identify which pin is being selected
if ([[annotation title] isEqualToString:@"Current Location"]) {
    postTag = 99999;
} else {
    postTag = [annotation getPinID];

} 

myDetailButton.tag  = postTag;

pinView.rightCalloutAccessoryView = myDetailButton;

pinView.animatesDrop = YES;

// Set to show a callout on the pin
pinView.canShowCallout = YES;

return pinView;
}

// Method to show detail view when the callOut button is selected
- (IBAction) checkButtonTapped: (id) sender {

int nrButtonPressed = ((UIButton *)sender).tag;

if (nrButtonPressed < 99999) {
    if (self.showDetailView == nil) {

        DetailData *tmpViewController = [[DetailData alloc] initWithNibName:@"Detail" bundle:nil];
        self.showDetailView = tmpViewController;
        [tmpViewController release];

    }

    buttonDetail = [[mapView annotations] objectAtIndex:(nrButtonPressed-1)];

    NSMutableArray *tmpArray = [NSMutableArray arrayWithObjects: [buttonDetail getDataI], [buttonDetail getDataII], [buttonDetail getDataIII], [buttonDetail getDataIV], [buttonDetail getDataV], nil];

    self.showDetailView.eventData = [[NSMutableArray alloc] initWithArray:tmpArray copyItems:YES];

    [self.navigationController pushViewController:self.showDetailView animated:YES];

    [self.showDetailView.eventData release];

}

}

As you can see, in checkButtonTapped, I write the selected output, and then collect data from the annotation for this output. The problem is that nrButtonPressed is now incorrect. But this is fine if compiled in 4.1

Answer 1

In checkButtonTapped, an annotation is identified using a button tag. The button tag is set to viewForAnnotation, calling the getPinID custom method.

mapView. , getPinID , mapView. , , . mapView , .

, , , mapView mapView:annotationView:calloutAccessoryControlTapped:.

, addTarget , addTarget calloutAccessoryControlTapped.

calloutAccessoryControlTapped view.annotation. , " ":

 - (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
    {
        if (view.annotation == mapView.userLocation)
            return;

        buttonDetail = (MyCustomAnnotationClass *)view.annotation;

        //show detail view using buttonDetail...
    }

, viewForAnnotation , . , , , , . if(pinView == nil).

Answer 2

- , ( )...

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

    MKPinAnnotationView *pinView = (MKPinAnnotationView *)[eMapView dequeueReusableAnnotationViewWithIdentifier:@"Pin"];

    if(pinView == nil) {

        pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"Pin"];
        pinView.frame = CGRectMake(0, 0, 25, 25);

    } else {

        pinView.annotation = annotation;

    }   

    // Set up the Right callout
    UIButton *myDetailButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    myDetailButton.frame = CGRectMake(0, 0, 23, 23);
    myDetailButton.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
    myDetailButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;

    pinView.rightCalloutAccessoryView = myDetailButton;

    pinView.animatesDrop = YES;

    // Set to show a callout on the pin
    pinView.canShowCallout = YES;

    return pinView;
}

// Added this at the suggestion of aBitObvious on StackOverflow - 120810
- (void)mapView:(MKMapView *)eMapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control {

    if (view.annotation == eMapView.userLocation)
        return;

    if (self.showDetailView == nil) {

        DetailData *tmpViewController = [[DetailData alloc] initWithNibName:@"DetailData" bundle:nil];
        self.showDetailView = tmpViewController;
        [tmpViewController release];

    }

    buttonDetail = (MyCustomAnnotationClass *)view.annotation;

    NSMutableArray *tmpArray = [NSMutableArray arrayWithObjects: [buttonDetail getDataI], [buttonDetail getDataII], [buttonDetail getDataIII], [buttonDetail getDataIV], [buttonDetail getDataV], nil];

    self.showDetailView.eventData = [[NSMutableArray alloc] initWithArray:tmpArray copyItems:YES];

    [self.navigationController pushViewController:self.showDetailView animated:YES];

    [self.showDetailView.eventData release];

}

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