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iOS

Kieran Robinson
Kieran Robinson
9,411 Points
Posted by Kieran Robinson
Kieran Robinson
9,411 Points

Photo Browser App - Extra Credit

I am trying to add the 'spring' spoken about in the video, however when i use this code UIAttachmentBehavior *attatch = [[UIAttachmentBehavior alloc]initWithItem:self.imageView attachedToAnchor:self.view.center]; [self.animator addBehavior:attatch];

to make the imageView 'spring' back to its original location, then add the behavior to the animator, the imageView is off the top right of the screen swinging strangely. This doesn't make sense as i have used [self.view.center] in order to centre the imageView?

3 Answers

Amit Bijlani
STAFF
Amit Bijlani
Treehouse Guest Teacher
Amit Bijlani
Amit Bijlani
Treehouse Guest Teacher

Your code is right but you just need to play with the other properties a bit. Also you might want to get rid of the snap behavior when apply the attachment behavior. Try the code below:

    CGPoint midPoint = CGPointMake(CGRectGetMidY(self.view.bounds),CGRectGetMidY(self.view.bounds));

    UIAttachmentBehavior *attach = [[UIAttachmentBehavior alloc]initWithItem:self.imageView attachedToAnchor:point];
    attach.frequency = 0.9;
    attach.damping = 0.1;
    attach.length = 5;
    [self.animator addBehavior:attach];

Feel free to play around with the values of the three properties: frequency, damping and length.

Stone Preston
Stone Preston
42,016 Points
Stone Preston
Stone Preston
42,016 Points

where is this code located? what are you trying to center it in? depending on where this code is, self.view might not be the view you want to use.

Kieran Robinson
Kieran Robinson
9,411 Points
Kieran Robinson
Kieran Robinson
9,411 Points

I have used the code in ViewWillAppear, is that the wrong place? Thanks for the reply!