react-native-dropdown-select

下拉框组件

安装组件：

npm i --save react-native-dropdown-select

展示ui图

使用（这些ui组件的详细方法参数、作用、属性，可查看源文件，里面有详细注释）

import {
DropdownBox,
ButtonImage,
Button,
PickDropdown
} from "react-native-dropdown-select";
 
/**
单选
**/
<PickDropdown options={this.state.typesList}
              style={styles.dropdwon}
              onSelect={(v)=>this.onSelectDrop(v)}
              defaultValue={"请选择客户"}/>
 
/**
多选
**/
<PickDropdown options={this.state.typesList}
              multiple={true}
              style={styles.dropdwon}
              onSelect={(v)=>this.onSelectDrop(v)}
              defaultValue={"请选择客户"}/>
 
/**
图片按钮
**/
<ButtonImage icon={TriangleDown}
             disabled={disabled}
             style={[styles.searchIcon,{
                      width:this.getStyle().height == undefined
                      ? this.getStyle(styles.searchIcon).height
                        : this.styles.height,
                          height:this.styles.height,
                     }]}
             iconStyle={[
                        {
                            width:this.styles.height,
                            height:this.styles.height,
                         },
                          styles.icon,
                          this.getIconStyle()
                      ]}
              onPress={this._onBtnImgPress}/>
 
/**
按钮
**/
<Button style={styles.multipleBtn}
        textStyle={styles.multipleBtnText}
        onPress={()=>this._onMultiplePress()}
        text={"确定"}/>
 

DropdownBox 详解

You can also render your option row and row separator by implement renderRow and renderSeparator function.

DropdownBox自定义样式属性

Give the style props as your choice:

• style: Change the style of the button (basic mode) / container (wrapper mode).
• textStyle: Change the style of text of the button. Invalid in wrapper mode.
• dropdownStyle: Change the style of dropdown container.
• multiple: Change the style of dropdown container.

DropdownBox的api属性

属性	类型	可选	默认值	描述
disabled	bool	Yes	false	disable / enable the component.
defaultIndex	number	Yes	-1	Init selected index. -1: None is selected. This only change the highlight of the dropdown row, you have to give a defaultValue to change the init text.
defaultValue	string	Yes	Please select...	Init text of the button. Invalid in wrapper mode.
options	array	Yes		Options. The dropdown will show a loading indicator if options is null/undefined.
animated	bool	Yes	true	Disable / enable fade animation.
showsVerticalScrollIndicator	bool	Yes	true	Show / hide vertical scroll indicator.
style	object	Yes		Style of the button.
textStyle	object	Yes		Style of the button text. Invalid in wrapper mode.
dropdownStyle	object	Yes		Style of the dropdown list.
dropdownTextStyle	object	Yes		Style of the dropdown option text.
dropdownTextHighlightStyle	object	Yes		Style of the dropdown selected option text.
adjustFrame	func	Yes		This is a callback after the frame of the dropdown have been calculated and before showing. You will receive a style object as argument with some of the props like width height top left and right. Change them to appropriate values that accord with your requirement and make the new style as the return value of this function.
renderRow	func	Yes		Customize render option rows: function(option,index,isSelected) Will render a default row if null/undefined.
renderSeparator	func	Yes		Customize render dropdown list separators. Will render a default thin gray line if null/undefined.
renderButtonText	func	Yes		Use this to extract and return text from option object. This text will show on button after option selected. Invalid in wrapper mode.
onDropdownWillShow	func	Yes		Trigger when dropdown will show by touching the button. Return false can cancel the event.
onDropdownWillHide	func	Yes		Trigger when dropdown will hide by touching the button. Return false can cancel the event.
onSelect	func	Yes		Trigger when option row touched with selected index and value. Return false can cancel the event.
accessible	bool	Yes	true	Set accessibility of dropdown modal and dropdown rows
keyboardShouldPersistTaps	enum('always', 'never', 'handled')	Yes	'never'	See react-native ScrollView props
multiple	bool	Yes	false	Sets single or multiple selections

DropdownBox的方法

方法	描述
show()	Show the dropdown. Won't trigger onDropdownWillShow.
hide()	Hide the dropdown. Won't trigger onDropdownWillHide.
select(idx)	Select the specified option of the idx. Select -1 will reset it to display defaultValue. Won't trigger onSelect.

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