iphone - iOS panGesture with images from NSArray -

i everyone,

i have nsarray images , wan't able pass 1 image other panning left or right (just in iphone photo library). array of pictures come collection view. first displayed image 1 selected in collection view.

for now, can display right image , move image left or right don't know how display other images , when image more 50% in view moves center.

thank's lot.

here's code :

- (void)viewdidload {     [super viewdidload];      //nslog(@"%i", _indexphoto);      self.photoimageview.image = [uiimage imagenamed:[_photoscollectionarray objectatindex:_indexphoto]];       uipangesturerecognizer *recognizer;     recognizer = [[uipangesturerecognizer alloc]initwithtarget: self action: @selector(pangesturehandle:)];      [recognizer setminimumnumberoftouches:1];     [recognizer setmaximumnumberoftouches:1];     [[self view] addgesturerecognizer:recognizer];  }   -(void) pangesturehandle:(uipangesturerecognizer *) sender {      nslog(@"pan gesture handling");     uipangesturerecognizer *pangesture = (uipangesturerecognizer *)sender;     cgpoint translation = [pangesture translationinview:self.view];      cgpoint imageviewposition = _photoimageview.center;     imageviewposition.x += translation.x;      _photoimageview.center = imageviewposition;     [pangesture settranslation:cgpointmake(0, 0) inview:self.view];  } 

a uiswipegesturerecognizer not right 1 use, since discrete gesture , message associated sent once.

what need uipangesturerecognizer: allow track finger movement , animate image accordingly.

this basic example of how gesture handling done:

- (ibaction)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];  } 

edit:

to able show other image next 1 panning around, need following:

1. add 3 images (say, previmage, curimage, nextimage) view displayed 1 next other;

2. when pan around curimage, move other ones;

3. when curimage displacement exceeds 50% of current view, animate off screen (and animate next/previmage displayed).

you handle 3 images using uiimageview or calayer.

this basic scheme fine if prefer working within uiviewcontroller. might think of having custom uiview holding 3 images (inside of calayers) , juggling them around in layoutsubviews.

in case, since suppose have more 3 images, need logics set of 3 images dealing updated when move next image. add 4th point above listed ones:

1. after moving next (previous) image:

   4.1 set previmage (nextimage) points curimage;

   4.2 set curimage point nextimage (previmage);

   4.3 make nextimage (previimage) point next (previous) image in array.

hope helps.