fix: 解决 picker、picker-view 组件滚动停止过慢的问题 fixed #278 fixed #367

src/core/view/components/picker-view-column/index.vue

 <script>
 import touchtrack from 'uni-mixins/touchtrack'
 import scroller from 'uni-mixins/scroller/index'
+import { Friction } from 'uni-mixins/scroller/Friction'
+import { Spring } from 'uni-mixins/scroller/Spring'
 
 export default {
   name: 'PickerViewColumn',
@@ -108,6 +110,8 @@ export default {
         enableX: false,
         enableSnap: true,
         itemSize: this.indicatorHeight,
+        friction: new Friction(0.0001),
+        spring: new Spring(2, 90, 20),
         onSnap: (index) => {
           if ((!isNaN(index)) && index !== this.current) {
             this.current = index

src/core/view/mixins/scroller/Scroll.js

 import { Friction } from './Friction'
 import { Spring } from './Spring'
 
-export function Scroll (extent) {
+export function Scroll (extent, friction, spring) {
   this._extent = extent
-  this._friction = new Friction(0.01)
-  this._spring = new Spring(1, 90, 20)
+  this._friction = friction || new Friction(0.01)
+  this._spring = spring || new Spring(1, 90, 20)
   this._startTime = 0
   this._springing = false
   this._springOffset = 0

src/core/view/mixins/scroller/Scroller.js

@@ -53,7 +53,7 @@ export function Scroller (element, options) {
   }
 
   this._position = 0
-  this._scroll = new Scroll(this._extent)
+  this._scroll = new Scroll(this._extent, options.friction, options.spring)
   this._onTransitionEnd = this.onTransitionEnd.bind(this)
   this.updatePosition()
 }