如何加速UISnapBehavior?

I can easily make the snapping slower by adding a UIDynamicItemBehavior with resistance. However, the default value for resistance is 0.0, which is still too slow for me. Setting the resistance to a negative value has no effect, it seems move as fast as 0.0.

我可以很容易地通过添加一个具有抗性的UIDynamicItemBehavior来让它变得更慢。但是，电阻的默认值是0.0，这对我来说还是太慢了。将阻力设置为负值没有任何影响，它的移动速度似乎和0.0一样快。

How can I make the UISnapBehavior faster?

如何使UISnapBehavior更快?

(Here is an example of making the snapping slower):

(这里有一个慢拍的例子):

UIDynamicItemBehavior *dynamicItemBehavior = [[UIDynamicItemBehavior alloc] initWithItems:@[button]];
dynamicItemBehavior.resistance = 50.0; // This makes the snapping SLOWER
UISnapBehavior *snapBehavior = [[UISnapBehavior alloc] initWithItem:button snapToPoint:point];
[self.animator addBehavior:button.dynamicItemBehavior];
[self.animator addBehavior:button.snapBehavior];

1 个解决方案

#1

You can also use a UIAttachmentBehavior to achieve a similar affect as UISnapBehavior, with greater control over speed. For example:

您还可以使用UIAttachmentBehavior实现与UISnapBehavior类似的影响，并对速度进行更大的控制。例如:

UIAttachmentBehavior *attachment = [[UIAttachmentBehavior alloc] initWithItem:viewToAnimate attachedToAnchor:viewToAnimate.center];
[self.animator addBehavior:attachment];
attachment.frequency = 20.0;
attachment.damping = 1.0;
attachment.anchorPoint = newPoint;

By increasing frequency to values above 1.0 will make it faster. By decreasing frequency to values between 0.0 and 1.0, will make it slower (or by adding resistance values greater than 1.0 to your UIDynamicItemBehavior).

通过将频率增加到1.0以上将使其更快。通过将频率降低到0.0到1.0之间的值，将使其变慢(或者通过向UIDynamicItemBehavior添加大于1.0的电阻值)。

If you find it oscillating at that final location when using this frequency value, add some resistance to the item, too:

如果你在使用这个频率值时发现它在最后的位置震荡，也增加一些对该项目的阻力:

UIDynamicItemBehavior *resistance = [[UIDynamicItemBehavior alloc] initWithItems:@[viewToAnimate]];
resistance.resistance = 100.0;
[self.animator addBehavior:resistance];

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