uimotion

问题 Here's a puzzle, imagine a typical UIInterpolatingMotionEffect ,,, UIInterpolatingMotionEffect *horizontalMotionEffect = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@" .. some property .." type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis]; horizontalMotionEffect.minimumRelativeValue = @(-50); horizontalMotionEffect.maximumRelativeValue = @(50); [someView addMotionEffect:horizontalMotionEffect]; Normally, you have to put in a property in line 3 there -- say, the center.x

问题 With UIInterpolatingMotionEffect, twist the iPhone, and you can have an image move. Now: imagine a red block you will "bounce around" on screen, using UICollisionBehavior and UIDynamicItemBehavior. When the user twists the iPhone: I want the boxes to "start moving" WITH SIMILAR PHYSICS FEEL to using UIInterpolatingMotionEffect. http://tinypic.com/player.php?v=b67mlc%3E&s=8#.VBVEq0uZNFx Aside:UX explanation: the bouncy effect (example: SMS on iPhone) has the same "feel" as the parallax image