ios - Why can't I drag images? -

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i working off of http://www.raywenderlich.com/33806/how-to-make-a-letterword-game-with-uikit-part-2 , , says in reference view add following implementation:

int _xoffset, _yoffset;

for initializer:

self.userinteractionenabled = yes;

it gives 3 methods implement handle dragging:

#pragma mark - dragging tile -(void)touchesbegan:(nsset *)touches withevent:(uievent *)event {     cgpoint pt = [[touches anyobject] locationinview:self.superview];     _xoffset = pt.x - self.center.x;     _yoffset = pt.y - self.center.y; }  -(void)touchesmoved:(nsset *)touches withevent:(uievent *)event {     cgpoint pt = [[touches anyobject] locationinview:self.superview];     self.center = cgpointmake(pt.x - _xoffset, pt.y - _yoffset); }  -(void)touchesended:(nsset *)touches withevent:(uievent *)event {     [self touchesmoved:touches withevent:event]; }

nothing seems happen, though, when touch 1 of images , try drag around. seems never move.

there more work do; want specific based on dragged image dropped. right i'm working on smoke test, , cannot see change in ui behavior before when added code.

thanks help,


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