route info in mapkit in iphone sdk

I want to write some info开发者_运维百科rmation in the navigation bar about a route..just as the default application does, like distance between the current location and the selected destination, direction etc.

How would i know when a certain pin is clicked as to provide the respective info.

Thanks in advance.

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When you implement MKAnotationView there is a method:

- (void)setSelected:(BOOL)selected animated:(BOOL)animated

As far as I understand, it is being called exactly when you want it to.