Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>How does <code>UIAttachmentBehavior</code> affect a view?</p> <p>It does it by modifying the view's transform.</p> <p>In this <a href="http://www.raywenderlich.com/50197/uikit-dynamics-tutorial" rel="nofollow">Ray Wenderlich tutorial</a> Colin Eberhardt logs the transform as the view is affected by the behavior. </p> <p>Even though the transform is never set, or modified directly, it changes as the view is moved by the behavior.</p> <p>So you can't set your transform, and hope for it to stay set, because it is being set by the behavior.</p> <p>In a side note, if you are trying to set the transform to scale by 1.5, you should use this:</p> <pre><code>self.transform = CGAffineTransformMakeScale(1.5, 1.5); </code></pre> <p>otherwise every time your <code>touchesBegan</code> is called it will grow by another 50%.</p> <p>In the documentation for UIDynamicAnimator, its says:</p> <blockquote> <p>"A dynamic animator automatically reads the initial state (position and rotation) of each dynamic item you add to it, and then takes responsibility for updating the item’s state. If you actively change the state of a dynamic item after you’ve added it to a dynamic animator, call this method to ask the animator to read and incorporate the new state."</p> </blockquote> <p>So just call your transform after adding the behavior, then call updateItemUsingCurrentState:</p> <pre><code>- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { [super touchesBegan:touches withEvent:event]; UITouch *touch = [[event allTouches] anyObject]; CGPoint touchLocation = [touch locationInView:self.referenceView]; _touchAttachmentBehavior = [[UIAttachmentBehavior alloc] initWithItem:self attachedToAnchor:touchLocation]; [_animator addBehavior:_touchAttachmentBehavior]; self.transform = CGAffineTransformMakeScale(1.5, 1.5); [_animator updateItemUsingCurrentState:self]; } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POUsing CGAffineTransformScale with UIAttachmentBehavior (UIDynamicAnimator)
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USHalR
    1. USHalR
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. CORight, UIAttachmentBehavior modifies the transform. But, why can't I tell it to 'modify a modified' transform? My interpretation of the documentation for `updateItemUsingCurrentState:` is that it should allow me to actively modify the scale. `A dynamic animator automatically reads the initial state (position and rotation) of each dynamic item you add to it, and then takes responsibility for updating the item’s state. If you actively change the state of a dynamic item after you’ve added it to a dynamic animator, call this method to ask the animator to read and incorporate the new state.`
      singulars
      1. PO
      1. USchazzwozzer
    2. COBTW, thank for the tip on CGAffineTransformMakeScale...good call.
      singulars
      1. PO
      1. USchazzwozzer
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload