iphone - warning: local declaration of 'mapView' hides instance variable -

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please, can explain , me how fix warning?? thx in advance.

-(void)mapview:(mkmapview *)mapview regionwillchangeanimated:(bool)animated {          mapregion=mapview.region; //first warning     }     -(void)mapview:(mkmapview *)mapview regiondidchangeanimated:(bool)animated  {          newregion=mapview.region; //second warning         if(mapregion.span.latitudedelta>newregion.span.latitudedelta||mapregion.span.longitudedelta>newregion.span.longitudedelta)             shouldadjustzoom=no;      }

you have instance variable name mapview already.

you can change local name else. example this:

-(void)mapview:(mkmapview *)amapview regionwillchangeanimated:(bool)animated {       mapregion=amapview.region; //first warning }  -(void)mapview:(mkmapview *)amapview regiondidchangeanimated:(bool)animated  {     newregion=amapview.region; //second warning     if(mapregion.span.latitudedelta>newregion.span.latitudedelta||mapregion.span.longitudedelta>newregion.span.longitudedelta)             shouldadjustzoom=no; }

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