Don't like ads? PRO users don't see any ads ;-)
Public Pastes
Guest

Untitled

By: a guest on Jul 29th, 2012  |  syntax: None  |  size: 2.45 KB  |  hits: 9  |  expires: Never
download  |  raw  |  embed  |  report abuse  |  print
Text below is selected. Please press Ctrl+C to copy to your clipboard. (⌘+C on Mac)
  1. Animate a UIButton into place from off screen when app loads
  2. -(void)viewWillAppear:(BOOL)animated
  3. {
  4.     CGPoint newLeftCenter = CGPointMake( 15.0f + myCocoButton.frame.size.width / 2.0f, myCocoButton.center.y);
  5.     [UIView beginAnimations:nil context:nil];
  6.     [UIView setAnimationDuration:4.0f];
  7.     myCocoButton.center = newLeftCenter;
  8.     [UIView commitAnimations];
  9.  
  10. }
  11.        
  12. @implementation MyViewController {
  13.     CGPoint _button0TrueCenter;
  14.     CGPoint _button1TrueCenter;
  15.     CGPoint _button2TrueCenter;
  16.     CGPoint _button3TrueCenter;
  17. }
  18.  
  19. static void moveButtonAndSaveCenter(UIButton *button, CGPoint offscreenCenter, CGPoint *trueCenter) {
  20.     *trueCenter = button.center;
  21.     button.center = offscreenCenter;
  22. }
  23.  
  24. - (void)viewWillAppear:(BOOL)animated {
  25.     [super viewWillAppear:animated];
  26.     if (animated) {
  27.         moveButtonAndSaveCenter(self.button0, CGPointMake(-100, 100), &_button0TrueCenter);
  28.         moveButtonAndSaveCenter(self.button1, CGPointMake(420, 100), &_button1TrueCenter);
  29.         moveButtonAndSaveCenter(self.button2, CGPointMake(-100, 200), &_button2TrueCenter);
  30.         moveButtonAndSaveCenter(self.button3, CGPointMake(420, 200), &_button3TrueCenter);
  31.     }
  32. }
  33.        
  34. static void animateButton(UIButton *button, CGPoint newCenter, NSTimeInterval delay) {
  35.     [UIView animateWithDuration:.25 delay:delay options:0 animations:^{
  36.         button.center = newCenter;
  37.     } completion:nil];
  38. }
  39.  
  40. - (void)viewDidAppear:(BOOL)animated {
  41.     [super viewDidAppear:animated];
  42.     if (animated) {
  43.         animateButton(self.button0, _button0TrueCenter, 0);
  44.         animateButton(self.button1, _button1TrueCenter, 0.2);
  45.         animateButton(self.button2, _button2TrueCenter, 0.4);
  46.         animateButton(self.button3, _button3TrueCenter, 0.6);
  47.     }
  48. }
  49.        
  50. - (void)viewDidAppear:(BOOL)animated
  51. {
  52.     [super viewDidAppear:animated];
  53.  
  54.     CGAffineTransform transform = CGAffineTransformMakeTranslation(0.f, -200.f);
  55.  
  56.     [self.buttons enumerateObjectsUsingBlock:^(UIButton *button, NSUInteger idx, BOOL *stop) {
  57.  
  58.        button.transform = transform; // This translates the view's off the top of the screen
  59.  
  60.        [UIView animateWithDuration:0.25f
  61.                              delay:0.25f * idx
  62.                            options:UIViewAnimationCurveEaseOut            // No point doing easeIn as the objects are offscreen anyway
  63.                         animations:^{
  64.                             button.transform = CGAffineTransformIdentity;
  65.                       } completion:nil];
  66.  
  67.        }];
  68. }
create a new version of this paste RAW Paste Data