`[MKAnnotationView setBounds:]` has performance degragation problem on iOS SDK 15

Question

• I created a customized annotation view by extending MKAnnotationView, and overriding the [MKAnnotationView setImage:] method.
• When the [MKAnnotationView setImage:] method is called, [MKAnnotationView setBounds:] is called, and thus [MKAnnotationView _metricsDidChange] and some other methods are called.
• I see that [MKAnnotationView _metricsDidChange] is the bottleneck for the performance problem.
• While in SDK 14, there is no such method called.

Attach the time profile screenshot below:

SDK14:

SDK15:

Answer 1

Temp fix

I searched but with no luck to find any official materials.

Finally, I found a workaround to make sure the SDK will not call [MKAnnotationView setBounds:] in [MKAnnotationView setImage:] method:

• set the MWAnnotationView's frame (using the image size) before setting the image to it.

Home this helps.