问题
I was wondering which would be faster/more efficient when it comes to taking off annotations from the map: hiding or removing. I need to remove and add 100 or so pins every time the user zooms in or out.
I can either loop through and hide all annotations using setHidden:, or just remove them using removeAnnotations:. I'm not sure which would be a better method.
回答1:
I believe the standard method is to remove them. Less memory overhead. Not that 100 takes up that much, but still better to remove and re-add when needed then to hide.
来源：https://stackoverflow.com/questions/7163841/should-i-remove-or-hide-my-annotations-in-mkmapview