修复items变更后，长度没更新，导致无法向上滑动的问题！

cnjon · cnjon · commit 2fc5527fdb75 · 2015-12-28T11:55:10.000+08:00
diff --git a/index.js b/index.js
@@ -50,6 +50,7 @@ export default class PickerAndroid extends React.Component{
 
 	componentWillReceiveProps(nextProps){
 		this.setState(this._stateFromProps(nextProps));
+		this.length = this.state.items.length;
 	}
 
 	_stateFromProps(props){

Original file line number	Diff line number	Diff line change
`@@ -50,6 +50,7 @@ export default class PickerAndroid extends React.Component{`
`50`	`50`
`51`	`51`	`componentWillReceiveProps(nextProps){`
`52`	`52`	`this.setState(this._stateFromProps(nextProps));`
	`53`	`+ this.length = this.state.items.length;`
`53`	`54`	`}`
`54`	`55`
`55`	`56`	`_stateFromProps(props){`