Overlay Images and Overlay Views with MapKit Tutorial

[rwenderlich]

This is the official thread to discuss the following blog post: Overlay Images and Overlay Views with MapKit Tutorial

[shippo0708]

How different is the API between MapKit and Google Maps API?

[cwagdev]

How different is the API between MapKit and Google Maps API?

As far as the iOS side goes, there really is no difference that I am aware of. They left the interfaces/APIs the same for MapKit and just changed the underlying implementations.

[elpuerco63]

I'm getting an error in the initWithFilename method of PVPark.m for _overlayTopRightCoordinate stating this property is not found?

I have even copy / pasted the sample code from the tutorial and get the same error.

When I look at the auto complete of the properties I only see three in the list, _overlayBottomLeftCoordinate, _overlayBottomRightCoordinate and _overlayTopLeftCoordinate

[akonakov]

I'm getting an error in the initWithFilename method of PVPark.m for _overlayTopRightCoordinate stating this property is not found?

Check if you really have the following additional getter, but not the getter for overlayTopRightCoordinate:

Code: Select all

- (CLLocationCoordinate2D)overlayBottomRightCoordinate
{
    return CLLocationCoordinate2DMake(self.overlayBottomLeftCoordinate.latitude, self.overlayTopRightCoordinate.longitude);
}

[cwagdev]

I'm getting an error in the initWithFilename method of PVPark.m for _overlayTopRightCoordinate stating this property is not found?

I have even copy / pasted the sample code from the tutorial and get the same error.

When I look at the auto complete of the properties I only see three in the list, _overlayBottomLeftCoordinate, _overlayBottomRightCoordinate and _overlayTopLeftCoordinate

Verify that PVPark.h declares the property.

Code: Select all

@property (nonatomic, readonly) CLLocationCoordinate2D overlayTopRightCoordinate;


[cwagdev]

I'm getting an error in the initWithFilename method of PVPark.m for _overlayTopRightCoordinate stating this property is not found?

Check if you really have the following additional getter, but not the getter for overlayTopRightCoordinate:

Code: Select all

- (CLLocationCoordinate2D)overlayBottomRightCoordinate
{
    return CLLocationCoordinate2DMake(self.overlayBottomLeftCoordinate.latitude, self.overlayTopRightCoordinate.longitude);
}

There's actually not a defined getter for overlayTopRightCoordinate, it is a defined property and assigned. overlayBottomRightCoordinate happens to be a property that can be inferred, so that is the reason I went with having an custom getter for it.

[elpuerco63]

I'm getting an error in the initWithFilename method of PVPark.m for _overlayTopRightCoordinate stating this property is not found?

Check if you really have the following additional getter, but not the getter for overlayTopRightCoordinate:

Code: Select all

- (CLLocationCoordinate2D)overlayBottomRightCoordinate
{
    return CLLocationCoordinate2DMake(self.overlayBottomLeftCoordinate.latitude, self.overlayTopRightCoordinate.longitude);
}

Cha ching!

Thanks

[elpuerco63]

This bit of code confuses me only due to the fact that boundary is declared as CLLocationCoordinate2D and not an NSArray?

I understand the setting of memory allocation using malloc but not about why you are doing it this way?

Is there an advantage in doing it this way over using NSArray and its addObject method?

Code: Select all


@property (nonatomic, readonly) CLLocationCoordinate2D *boundary;


_boundary = malloc(sizeof(CLLocationCoordinate2D)*_boundaryPointsCount);
       
        for(int i = 0; i < _boundaryPointsCount; i++) {
            CGPoint p = CGPointFromString(boundaryPoints[i]);
            _boundary[i] = CLLocationCoordinate2DMake(p.x,p.y);
        }


[tamarawirz]

Thanks for the tutorial!