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#import "DDAnnotationView.h"<\/span><\/div>#import "DDAnnotation.h"<\/span><\/div> <\/div>#pragma mark -<\/span><\/div>#pragma mark DDAnnotationView implementation<\/span><\/div> <\/div>@implementation<\/span> DDAnnotationView<\/span><\/div> <\/div>@synthesize<\/span> mapView<\/span> =<\/span> _mapView<\/span>;<\/span><\/div> <\/div>-<\/span> (<\/span>id<\/span>)<\/span>initWithAnnotation:<\/span>(<\/span>id<\/span> <<\/span>MKAnnotation<\/span>><\/span>)<\/span>annotation<\/span> reuseIdentifier:<\/span>(<\/span>NSString<\/span> *<\/span>)<\/span>reuseIdentifier<\/span> {<\/span><\/div> <\/div>    if<\/span> ((<\/span>self<\/span> =<\/span> [<\/span>super<\/span> initWithAnnotation:<\/span>annotation<\/span> reuseIdentifier:<\/span>reuseIdentifier<\/span>]))<\/span> {<\/span><\/div>        self<\/span>.<\/span>enabled<\/span> =<\/span> YES<\/span>;<\/span><\/div>        self<\/span>.<\/span>canShowCallout<\/span> =<\/span> YES<\/span>;<\/span><\/div>        self<\/span>.<\/span>multipleTouchEnabled<\/span> =<\/span> NO<\/span>;<\/span><\/div>        self<\/span>.<\/span>animatesDrop<\/span> =<\/span> YES<\/span>;<\/span>		<\/div>    }<\/span><\/div>    return<\/span> self<\/span>;<\/span><\/div>}<\/span><\/div> <\/div>#pragma mark -<\/span><\/div>#pragma mark Handling events<\/span><\/div> <\/div>// Reference: iPhone Application Programming Guide > Device Support > Displaying Maps and Annotations > Displaying Annotations > Handling Events in an Annotation View<\/span><\/div> <\/div>-<\/span> (<\/span>void<\/span>)<\/span>touchesBegan:<\/span>(<\/span>NSSet<\/span> *<\/span>)<\/span>touches<\/span> withEvent:<\/span>(<\/span>UIEvent<\/span> *<\/span>)<\/span>event<\/span> {<\/span><\/div> <\/div>    // The view is configured for single touches only.<\/span><\/div>    UITouch<\/span>*<\/span> aTouch<\/span> =<\/span> [<\/span>touches<\/span> anyObject<\/span>];<\/span><\/div>    _startLocation<\/span> =<\/span> [<\/span>aTouch<\/span> locationInView:<\/span>[<\/span>self<\/span> superview<\/span>]];<\/span><\/div>    _originalCenter<\/span> =<\/span> self<\/span>.<\/span>center<\/span>;<\/span><\/div> <\/div>    [<\/span>super<\/span> touchesBegan:<\/span>touches<\/span> withEvent:<\/span>event<\/span>];<\/span><\/div>}<\/span><\/div> <\/div>-<\/span> (<\/span>void<\/span>)<\/span>touchesMoved:<\/span>(<\/span>NSSet<\/span> *<\/span>)<\/span>touches<\/span> withEvent:<\/span>(<\/span>UIEvent<\/span> *<\/span>)<\/span>event<\/span> {<\/span><\/div> <\/div>    UITouch<\/span>*<\/span> aTouch<\/span> =<\/span> [<\/span>touches<\/span> anyObject<\/span>];<\/span><\/div>    CGPoint<\/span> newLocation<\/span> =<\/span> [<\/span>aTouch<\/span> locationInView:<\/span>[<\/span>self<\/span> superview<\/span>]];<\/span><\/div>    CGPoint<\/span> newCenter<\/span>;<\/span><\/div> <\/div>    // If the user's finger moved more than 5 pixels, begin the drag.<\/span><\/div>    if<\/span> ((<\/span>abs<\/span>(<\/span>newLocation<\/span>.<\/span>x<\/span> -<\/span> _startLocation<\/span>.<\/span>x<\/span>)<\/span> ><\/span> 5.0<\/span>)<\/span> ||<\/span> (<\/span>abs<\/span>(<\/span>newLocation<\/span>.<\/span>y<\/span> -<\/span> _startLocation<\/span>.<\/span>y<\/span>)<\/span> ><\/span> 5.0<\/span>))<\/span> {<\/span><\/div>        _isMoving<\/span> =<\/span> YES<\/span>;<\/span>		<\/div>    }<\/span><\/div> <\/div>    // If dragging has begun, adjust the position of the view.<\/span><\/div>    if<\/span> (<\/span>_mapView<\/span> &&<\/span> _isMoving<\/span>)<\/span> {<\/span><\/div>        newCenter<\/span>.<\/span>x<\/span> =<\/span> _originalCenter<\/span>.<\/span>x<\/span> +<\/span> (<\/span>newLocation<\/span>.<\/span>x<\/span> -<\/span> _startLocation<\/span>.<\/span>x<\/span>);<\/span><\/div>        newCenter<\/span>.<\/span>y<\/span> =<\/span> _originalCenter<\/span>.<\/span>y<\/span> +<\/span> (<\/span>newLocation<\/span>.<\/span>y<\/span> -<\/span> _startLocation<\/span>.<\/span>y<\/span>);<\/span><\/div>        self<\/span>.<\/span>center<\/span> =<\/span> newCenter<\/span>;<\/span><\/div>    }<\/span> else<\/span> {<\/span><\/div>        // Let the parent class handle it.<\/span><\/div>        [<\/span>super<\/span> touchesMoved:<\/span>touches<\/span> withEvent:<\/span>event<\/span>];<\/span>		<\/div>    }<\/span><\/div>}<\/span><\/div> <\/div>-<\/span> (<\/span>void<\/span>)<\/span>touchesEnded:<\/span>(<\/span>NSSet<\/span> *<\/span>)<\/span>touches<\/span> withEvent:<\/span>(<\/span>UIEvent<\/span> *<\/span>)<\/span>event<\/span> {<\/span><\/div> <\/div>    if<\/span> (<\/span>_mapView<\/span> &&<\/span> _isMoving<\/span>)<\/span> {<\/span>				<\/div>        // Update the map coordinate to reflect the new position.<\/span><\/div>        CGPoint<\/span> newCenter<\/span> =<\/span> self<\/span>.<\/span>center<\/span>;<\/span><\/div>        DDAnnotation<\/span>*<\/span> theAnnotation<\/span> =<\/span> (<\/span>DDAnnotation<\/span> *<\/span>)<\/span>self<\/span>.<\/span>annotation<\/span>;<\/span><\/div>        CLLocationCoordinate2D<\/span> newCoordinate<\/span> =<\/span> [<\/span>_mapView<\/span> convertPoint:<\/span>newCenter<\/span> toCoordinateFromView:<\/span>self<\/span>.<\/span>superview<\/span>];<\/span><\/div> <\/div>        [<\/span>theAnnotation<\/span> changeCoordinate:<\/span>newCoordinate<\/span>];<\/span><\/div> <\/div>        // Clean up the state information.<\/span><\/div>        _startLocation<\/span> =<\/span> CGPointZero<\/span>;<\/span><\/div>        _originalCenter<\/span> =<\/span> CGPointZero<\/span>;<\/span><\/div>        _isMoving<\/span> =<\/span> NO<\/span>;<\/span>		<\/div>    }<\/span> else<\/span> {<\/span><\/div>        [<\/span>super<\/span> touchesEnded:<\/span>touches<\/span> withEvent:<\/span>event<\/span>];<\/span>		<\/div>    }<\/span><\/div>}<\/span><\/div> <\/div>-<\/span> (<\/span>void<\/span>)<\/span>touchesCancelled:<\/span>(<\/span>NSSet<\/span> *<\/span>)<\/span>touches<\/span> withEvent:<\/span>(<\/span>UIEvent<\/span> *<\/span>)<\/span>event<\/span> {<\/span><\/div> <\/div>    if<\/span> (<\/span>_mapView<\/span> &&<\/span> _isMoving<\/span>)<\/span> {<\/span><\/div>        // Move the view back to its starting point.<\/span><\/div>        self<\/span>.<\/span>center<\/span> =<\/span> _originalCenter<\/span>;<\/span><\/div> <\/div>        // Clean up the state information.<\/span><\/div>        _startLocation<\/span> =<\/span> CGPointZero<\/span>;<\/span><\/div>        _originalCenter<\/span> =<\/span> CGPointZero<\/span>;<\/span><\/div>        _isMoving<\/span> =<\/span> NO<\/span>;<\/span><\/div>    }<\/span> else<\/span> {<\/span><\/div>        [<\/span>super<\/span> touchesCancelled:<\/span>touches<\/span> withEvent:<\/span>event<\/span>];<\/span>		<\/div>    }<\/span><\/div>}<\/span><\/div> <\/div>@end<\/span><\/div><\/pre><\/div>\n          \n        <\/div>\n\n        \n          view raw<\/a>\n          DDAnnotationView.m<\/a>\n          This Gist<\/a> brought to you by GitHub<\/a>.\n        <\/div>\n      <\/div>\n    \n  \n<\/div>\n')