iphone - How to restrict uilabel to be dragged within a particular frame only? -

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i have added 1 label in imageview , added pangesture dragging label.with code label dragged within whole.but want restrict label drag within frame of uiimageview only. how can achieve this? code adding lable , gesture below.

lblquote=[[uilabel alloc]init];           lblquote.frame=cgrectmake(130,380, 400,100);         lblquote.userinteractionenabled=true;         lblquote.backgroundcolor=[uicolor clearcolor];         lblquote.userinteractionenabled=true;         lblquote.linebreakmode=uilinebreakmodewordwrap;         lblquote.font=[uifont systemfontofsize:40.0];             lblquote.tag=500;         lblquote.text=@"";             cgsize maximumlabelsize = cgsizemake(296,9999);          cgsize expectedlabelsize = [strquote sizewithfont:lblquote.font                                          constrainedtosize:maximumlabelsize                                              linebreakmode:lblquote.linebreakmode];              //adjust label the new height.          int nooflines=expectedlabelsize.height/16.0;         lblquote.numberoflines=nooflines;          // cgrect newframe = lblquote.frame;         //newframe.size.height = expectedlabelsize.height;         // yourlabel.frame = newframe;          lblquote.textalignment=uitextalignmentcenter;           uipangesturerecognizer *gesture = [[[uipangesturerecognizer alloc]                                              initwithtarget:self                                              action:@selector(labeldragged:)] autorelease];         [lblquote addgesturerecognizer:gesture];   - (void)labeldragged:(uipangesturerecognizer *)gesture {     uilabel *label = (uilabel *)gesture.view;     cgpoint translation = [gesture translationinview:label];      // move label     label.center = cgpointmake(label.center.x + translation.x,                                 label.center.y + translation.y);      // reset translation       [gesture settranslation:cgpointzero inview:label]; }

i tried moving label on touches event.code below:

- (void)touchesmoved:(nsset *)touches withevent:(uievent *)event {      uitouch *touch = [touches anyobject];     cgpoint pointmoved = [touch locationinview:imgview2];       lblquote.frame=cgrectmake(pointmoved.x, pointmoved.y, lblquote.frame.size.width, lblquote.frame.size.height);    }

but movement not smooth pan gesture recognizer.sometimes touch in direction , label movement in other direction , more or less movement touch.

well totally depends on logics although wrote code you, hope you!! make sure uilabel userintraction set yes; , use touch began , touch moved methods instead of pangesture.... see now

-(void)touchesbegan:(nsset *)touches withevent:(uievent *)event {   uitouch *touch = [[event alltouches]anyobject];   if([touch view] == lblname)   {     nslog(@"touch on label");     cgpoint pt = [[touches anyobject] locationinview:lblname];     startlocation = pt;     // startlocation cgpoint declare globaly in .h..and lblname uilabel   } }  - (void) touchesmoved:(nsset *)touches withevent: (uievent *)event  {    uitouch *touch = [[event alltouches]anyobject];    if([touch view] == lblname)    {      cgpoint pt = [[touches anyobject] previouslocationinview:lblname];      cgfloat dx = pt.x - startlocation.x;      cgfloat dy = pt.y - startlocation.y;      cgpoint newcenter = cgpointmake(lblname.center.x + dx, lblname.center.y + dy);       //now put if condition dragging in specific area      cgfloat min_x = lblname.center.x + dx - lblname.frame.size.width/2.0;     cgfloat max_x = lblname.center.x + dx + lblname.frame.size.width/2.0;     cgfloat min_y = lblname.center.y + dy - lblname.frame.size.height/2.0;     cgfloat max_y = lblname.center.y + dy + lblname.frame.size.height/2.0;      if((min_x >= imageview.frame.origin.x && max_x <=  imageview.frame.origin.x +  imageview.frame.size.width) && (min_y >=  imageview.frame.origin.y && max_y <=  imageview.frame.origin.y +  imageview.frame.size.height))     {         lblname.center = newcenter;     }   } }

thank you!!


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