How to use UIPanGestureRecognizer to move object iPhone iPad

Question

There are several examples of the UIPanGestureRecognizer class  For example I have read this and I am still not able to use it     On the nib file that I am working on I have a UIView  white rectangle on image  that I wish to drag with that class     and in my  m file I have placed   -  void setTranslation  CGPoint translation inView  UIView   view       NSLog   Test to see if this method gets executed        and that method does not get executed when I drag the mouse across the UIView  I have also tried placing   -  void pan  UIPanGestureRecognizer   gesture       NSLog   testing        And that method does not get executed either  Maybe I am wrong but I think this methods should work like the -  void  touchesMoved  NSSet   touches withEvent  UIEvent   event method where I just have to place that method and it will get called whenever there are touches    What am I doing wrong  Maybe do I have to draw a connection to that method  If so how can I do that

User · Answer

if   recognizer state     UIGestureRecognizerStateChanged            CGPoint translation1    recognizer translationInView main view       img12 center CGPointMake img12 center x translation1 x  img12 center y  translation1 y        recognizer setTranslation CGPointMake 0  0  inView main view        recognizer view center CGPointMake recognizer view center x translation1 x  recognizer view center y  translation1 y      - void move  UIPanGestureRecognizer  recognizer       if   recognizer state     UIGestureRecognizerStateChanged                    CGPoint translation    recognizer translationInView self view           recognizer view center CGPointMake recognizer view center x translation x  recognizer view center y  translation y            recognizer setTranslation CGPointMake 0  0  inView self view

User · Answer

The Swift 2 version      start detecting pan gesture let panGestureRecognizer   UIPanGestureRecognizer target  self  action   selector TTAltimeterDetailViewController panGestureDetected       panGestureRecognizer minimumNumberOfTouches   1 self chartOverlayView addGestureRecognizer panGestureRecognizer   func panGestureDetected panGestureRecognizer  UIPanGestureRecognizer        print  pan gesture recognized

User · Answer

Casting my hat into the ring a couple years later    Will need to save the beginning center of the image view   var panBegin  CGPoint zero   Then update the new center using a transform   if recognizer state     began        panBegin   imageView  center    else if recognizer state     ended       panBegin   CGPoint zero    else if recognizer state     changed       let translation   recognizer translation in  view      let panOffsetTransform   CGAffineTransform  translationX  translation x  y  translation y       imageView  center   panBegin applying panOffsetTransform

User · Answer

UIPanGestureRecognizer   pan1     UIPanGestureRecognizer alloc initWithTarget self action  selector moveObject     pan1 minimumNumberOfTouches   1   image1 addGestureRecognizer pan1    - void moveObject  UIPanGestureRecognizer   pan     image1 center    pan locationInView image1 superview

User · Answer

swift 2 version of the  MS AppTech answer  func handlePan panGest   UIPanGestureRecognizer    let velocity   CGPoint   panGest velocityInView self view           let magnitude   CGFloat   CGFloat sqrtf  Float velocity x    Float velocity x      Float velocity y    Float velocity y              let slideMult  CGFloat   magnitude   200            NSLog   magnitude   f  slideMult   f   magnitude  slideMult            let slideFactor   CGFloat   0 1   slideMult     Increase for more of a slide         var finalPoint   CGPoint   CGPointMake panGest view  center x    velocity x   slideFactor                                            panGest view  center y    velocity y   slideFactor            finalPoint x   min max finalPoint x  0   self view bounds size width           finalPoint y   min max finalPoint y  0   self view bounds size height            UIView animateWithDuration Double slideFactor 2   delay  0  options  UIViewAnimationOptions CurveEaseOut  animations                panGest view  center   finalPoint                 completion  nil

User · Answer

I found the tutorial Working with UIGestureRecognizers  and I think that is what I am looking for   It helped me come up with the following solution   - IBAction  someMethod       UIPanGestureRecognizer  panRecognizer     UIPanGestureRecognizer alloc  initWithTarget self action  selector move          panRecognizer setMinimumNumberOfTouches 1        panRecognizer setMaximumNumberOfTouches 1        ViewMain addGestureRecognizer panRecognizer        panRecognizer release      - void move  UIPanGestureRecognizer  sender        self view bringSubviewToFront sender view       CGPoint translatedPoint    sender translationInView sender view superview        if  sender state    UIGestureRecognizerStateBegan            firstX   sender view center x          firstY   sender view center y              translatedPoint   CGPointMake sender view center x translatedPoint x  sender view center y translatedPoint y         sender view setCenter translatedPoint        sender setTranslation CGPointZero inView sender view        if  sender state    UIGestureRecognizerStateEnded            CGFloat velocityX    0 2  sender velocityInView self view  x           CGFloat velocityY    0 2  sender velocityInView self view  y            CGFloat finalX   translatedPoint x   velocityX          CGFloat finalY   translatedPoint y   velocityY    translatedPoint y     35   UIPanGestureRecognizer  sender velocityInView self view  y            if  finalX  lt  0                finalX   0            else if  finalX  gt  self view frame size width                finalX   self view frame size width                     if  finalY  lt  50       to avoid status bar             finalY   50            else if  finalY  gt  self view frame size height                finalY   self view frame size height                     CGFloat animationDuration    ABS velocityX   0002   2           NSLog   the duration is   f   animationDuration             UIView beginAnimations nil context NULL            UIView setAnimationDuration animationDuration            UIView setAnimationCurve UIViewAnimationCurveEaseOut            UIView setAnimationDelegate self            UIView setAnimationDidStopSelector  selector animationDidFinish              sender view  setCenter CGPointMake finalX  finalY             UIView commitAnimations

User · Answer

- IBAction Method         UIPanGestureRecognizer  panRecognizer     UIPanGestureRecognizer alloc  initWithTarget self action  selector handlePan            panRecognizer setMinimumNumberOfTouches 1          panRecognizer setMaximumNumberOfTouches 1          ViewMain addGestureRecognizer panRecognizer          panRecognizer release     -  Void handlePan  UIPanGestureRecognizer   recognizer         CGPoint translation    recognizer translationInView self view        recognizer view center   CGPointMake recognizer view center x   translation x                                        recognizer view center y   translation y         recognizer setTranslation CGPointMake 0  0  inView self view         if  recognizer state    UIGestureRecognizerStateEnded              CGPoint velocity    recognizer velocityInView self view            CGFloat magnitude   sqrtf  velocity x   velocity x     velocity y   velocity y             CGFloat slideMult   magnitude   200           NSLog   magnitude   f  slideMult   f   magnitude  slideMult             float slideFactor   0 1   slideMult     Increase for more of a slide          CGPoint finalPoint   CGPointMake recognizer view center x    velocity x   slideFactor                                         recognizer view center y    velocity y   slideFactor             finalPoint x   MIN MAX finalPoint x  0   self view bounds size width            finalPoint y   MIN MAX finalPoint y  0   self view bounds size height              UIView animateWithDuration slideFactor 2 delay 0 options UIViewAnimationOptionCurveEaseOut animations                 recognizer view center   finalPoint             completion nil

[iphone] How to use UIPanGestureRecognizer to move object? iPhone/iPad

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