iOS 开发三级下拉菜单功能实现

释放双眼,带上耳机,听听看~!

不管是使用什么系统,都会出现下拉菜单的情况,但是程序员在IOS中要怎么实现呢?别着急,下面就让技术狗小编带大家来学习iOS 三级下拉菜单功能实现。

前言

App 常用控件 — 多级下拉菜单, 如团购类, 房屋类, 对数据进行筛选. 有一级, 二级, 三级, 再多就不会以这种样式,呈现给用户了. 作者就简单聊一下 多级下拉菜单

一 目标

  1. 默认显示一个 TableView, 点击数据后, 添加第二个TableView, 并实现大小变化
  2. 第二次打开下拉菜单. 保存上次选中数据

二 菜单控件DropMenuView

.h文件

#import <UIKit/UIKit.h>
@class DropMenuView;
@protocol DropMenuViewDelegate <NSObject>
-(void)dropMenuView:(DropMenuView *)view didSelectName:(NSString *)str;
@end
@interface DropMenuView : UIView
@property (nonatomic, weak) id<DropMenuViewDelegate> delegate;
/** 箭头变化 */
@property (nonatomic, strong) UIView *arrowView;
/**
控件设置
@param view 提供控件 位置信息
@param tableNum 显示TableView数量
@param arr 使用数据
*/
-(void)creatDropView:(UIView *)view withShowTableNum:(NSInteger)tableNum withData:(NSArray *)arr;
/** 视图消失 */
- (void)dismiss;
@end

.m文件

#import "DropMenuView.h"
#define kWidth [UIScreen mainScreen].bounds.size.width
#define kHeight [UIScreen mainScreen].bounds.size.height
@interface DropMenuView ()<UITableViewDelegate, UITableViewDataSource>
{
@private
/** 保存 选择的数据(行数) */
NSInteger selects[3];
}
@property (nonatomic, assign) BOOL show;  // 按钮点击后 视图显示/隐藏
@property (nonatomic, assign) CGFloat rowHeightNum; // 设置 rom 高度
/* 底层取消按钮 */
@property (nonatomic, strong) UIButton *cancelButton;
/** 表视图数组 */
@property (nonatomic, strong) NSArray *tableViewArr;
/** 表视图的 底部视图 */
@property (nonatomic, strong) UIView *tableViewUnderView;
/** 显示 TableView 数量 */
@property (nonatomic, assign) NSInteger tableCount;
/** 数据 */
@property (nonatomic, strong) NSArray *dataArr;
@end
@implementation DropMenuView
- (instancetype)init
{
self = [super init];
if (self) {
/** 数据初始化 */
self.dataArr = [NSArray array];
/** 保存 初始值为-1 */
for (int i = 0; i < 3; i++) {
selects[i] = -1;
}
/* 底层取消按钮 */
self.cancelButton = [UIButton buttonWithType:UIButtonTypeCustom];
self.cancelButton.backgroundColor = [UIColor colorWithWhite:0.0 alpha:0.3];
[self.cancelButton addTarget:self action:@selector(clickCancelButton:) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:self.cancelButton];
/** 表视图的 底部视图初始化 */
self.tableViewUnderView = [[UIView alloc] init];
self.tableViewUnderView.backgroundColor = [UIColor colorWithRed:0.74 green:0.73 blue:0.76 alpha:1.000];
[self.cancelButton addSubview:self.tableViewUnderView];
/** 默认设置为no, row高度为40 */
self.show = NO;
self.rowHeightNum = 40.0f;
}
return self;
}
-(void)creatDropView:(UIView *)view withShowTableNum:(NSInteger)tableNum withData:(NSArray *)arr{
if (!self.show) {
self.show = !self.show;
// 显示 TableView数量
self.tableCount = tableNum;
// 数据
self.dataArr = arr;
for (UITableView *tableView in self.tableViewArr) {
[tableView reloadData];
}
// 初始位置 设置
CGFloat x = 0.f;
CGFloat y = view.frame.origin.y + view.frame.size.height;
CGFloat w = kWidth;
CGFloat h = kHeight - y;
self.frame = CGRectMake(x, y, w, h);
self.cancelButton.frame = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);
self.tableViewUnderView.frame = CGRectMake(0, 0, self.frame.size.width, self.rowHeightNum * 7);
if (!self.superview) {
[[[UIApplication sharedApplication] keyWindow] addSubview:self];
self.alpha = 0.0f;
[UIView animateWithDuration:0.2f animations:^{
self.alpha = 1.0f;
}];
[self loadSelects];
[self adjustTableViews];
}
}else{
/** 什么也不选择时候, 再次点击按钮 消失视图 */
[self dismiss];
}
}
#pragma mark - 加载选中的TableView
-(void)loadSelects{
[self.tableViewArr enumerateObjectsUsingBlock:^(UITableView *tableView, NSUInteger idx, BOOL * _Nonnull stop) {
// 刷新TableView数据
[tableView reloadData];
// 选中TableView某一行
[tableView selectRowAtIndexPath:[NSIndexPath indexPathForRow:selects[idx] inSection:0] animated:NO scrollPosition:UITableViewScrollPositionNone];
// 加 !idx 是因为 循环第一次 idx == 0 方法不执行, 所以需要循环一次 加载一个TableView.
if((selects[idx] != -1 && !tableView.superview) || !idx) {
[self.tableViewUnderView addSubview:tableView];
[UIView animateWithDuration:0.2 animations:^{
if (self.arrowView) {
self.arrowView.transform = CGAffineTransformMakeRotation(M_PI);
}
}];
}
}];
}
#pragma mark - 重置TableView的 位置
-(void)adjustTableViews{
// 显示的 TableView 数量
int addTableCount = 0;
for (UITableView *tableView in self.tableViewArr) {
if (tableView.superview) {
addTableCount++;
}
}
for (int i = 0; i < addTableCount; i++) {
UITableView *tableView = self.tableViewArr[i];
CGRect adjustFrame = tableView.frame;
adjustFrame.size.width = kWidth / addTableCount ;
adjustFrame.origin.x = adjustFrame.size.width * i + 0.5 * i;
adjustFrame.size.height = self.tableViewUnderView.frame.size.height ;
tableView.frame = adjustFrame;
}
}
#pragma mark - TableView协议
/** 行数 */
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
NSInteger __block count;
[self.tableViewArr enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
if (obj == tableView) {
NSInteger firstSelectRow = ((UITableView *)self.tableViewArr[0]).indexPathForSelectedRow.row ;
NSInteger secondSelectRow = ((UITableView *)self.tableViewArr[1]).indexPathForSelectedRow.row ;
count = [self countForChooseTable:idx firstTableSelectRow:firstSelectRow withSecondTableSelectRow:secondSelectRow];
}
}];
return count;
}
// 可以将 方法提出来, 如果有需要 可以设置为协议实现封装, 作者仅提取一个, 其他均在 TableView自身协议中写
-(NSInteger)countForChooseTable:(NSInteger)idx firstTableSelectRow:(NSInteger)firstSelectRow withSecondTableSelectRow:(NSInteger)secondSelectRow{
if (idx == 0) {
return self.dataArr.count;
}else if (idx == 1){
if (firstSelectRow == -1) {
return 0;
}else{
if (self.tableCount == 2) {
return [self.dataArr[firstSelectRow][@"subcategories"] count];
}else{
return [self.dataArr[firstSelectRow][@"sub"] count];
}
}
}else{
if (secondSelectRow == -1) {
return 0;
}else{
return [self.dataArr[firstSelectRow][@"sub"][secondSelectRow][@"sub"] count];
}
}
}
/** 自定义cell */
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"DropCell"];
cell.textLabel.font = [UIFont systemFontOfSize:14];
if (self.tableCount == 1) {
cell.textLabel.text = self.dataArr[indexPath.row][@"label"];
}else if (self.tableCount == 2){
NSInteger firstSelectRow = ((UITableView *)self.tableViewArr[0]).indexPathForSelectedRow.row;
if (tableView == self.tableViewArr[0]) {
cell.textLabel.text = self.dataArr[indexPath.row][@"name"];
}else if (tableView == self.tableViewArr[1]){
cell.textLabel.text = self.dataArr[firstSelectRow][@"subcategories"][indexPath.row];
}
}else if (self.tableCount == 3){
NSInteger firstSelectRow = ((UITableView *)self.tableViewArr[0]).indexPathForSelectedRow.row;
NSInteger secondSelectRow = ((UITableView *)self.tableViewArr[1]).indexPathForSelectedRow.row;
if (tableView == self.tableViewArr[0]) {
cell.textLabel.text = self.dataArr[indexPath.row][@"name"];
}else if (tableView == self.tableViewArr[1]){
cell.textLabel.text = self.dataArr[firstSelectRow][@"sub"][indexPath.row][@"name"];
}else if (tableView == self.tableViewArr[2]){
cell.textLabel.text = self.dataArr[firstSelectRow][@"sub"][secondSelectRow][@"sub"][indexPath.row];
}
}
return cell;
}
/** 点击 */
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
UITableView *secondTableView = self.tableViewArr[1];
UITableView *thirdTableView = self.tableViewArr[2];
if (self.tableCount == 1) {
[self saveSelects];
[self dismiss];
[_delegate dropMenuView:self didSelectName:self.dataArr[indexPath.row][@"label"]];
}else if (self.tableCount == 2){
if (tableView == self.tableViewArr[0]) {
if (!secondTableView.superview) {
[self.tableViewUnderView addSubview:secondTableView];
}
[secondTableView reloadData];
[self adjustTableViews];
}else if (tableView == self.tableViewArr[1]){
[self saveSelects];
[self dismiss];
NSInteger firstSelectRow = ((UITableView *)self.tableViewArr[0]).indexPathForSelectedRow.row;
[_delegate dropMenuView:self didSelectName:self.dataArr[firstSelectRow][@"subcategories"][indexPath.row]];
}
}else if (self.tableCount == 3){
NSInteger firstSelectRow = ((UITableView *)self.tableViewArr[0]).indexPathForSelectedRow.row;
NSInteger secondSelectRow = ((UITableView *)self.tableViewArr[1]).indexPathForSelectedRow.row;
if (tableView == self.tableViewArr[0]) {
if (!secondTableView.superview) {
[self.tableViewUnderView addSubview:secondTableView];
}
[self adjustTableViews];
[secondTableView reloadData];
}else if (tableView == self.tableViewArr[1]){
if (!thirdTableView.superview) {
[self.tableViewUnderView addSubview:thirdTableView];
}
[self adjustTableViews];
[thirdTableView reloadData];
}else if (tableView == self.tableViewArr[2]){
[self saveSelects];
[self dismiss];
[_delegate dropMenuView:self didSelectName:self.dataArr[firstSelectRow][@"sub"][secondSelectRow][@"sub"][indexPath.row]];
}
}
}
#pragma mark - 记录 选择状态
-(void)saveSelects{
[self.tableViewArr enumerateObjectsUsingBlock:^(UITableView *tableView, NSUInteger idx, BOOL * _Nonnull stop) {
selects[idx] = tableView.superview ? tableView.indexPathForSelectedRow.row : -1;
}];
}
#pragma mark - 视图消失
- (void)dismiss{
if(self.superview) {
self.show = !self.show;
[self endEditing:YES];
[UIView animateWithDuration:.25f animations:^{
self.alpha = .0f;
} completion:^(BOOL finished) {
[self.tableViewUnderView.subviews enumerateObjectsUsingBlock:^(UIView *obj, NSUInteger idx, BOOL *stop) {
[obj removeFromSuperview];
}];
[self removeFromSuperview];
[UIView animateWithDuration:0.2 animations:^{
if (self.arrowView) {
self.arrowView.transform = CGAffineTransformMakeRotation(0);
}
}];
}];
}
}
/** 底部按钮, 视图消失 */
-(void)clickCancelButton:(UIButton *)button{
[self dismiss];
}
/** 懒加载 */
-(NSArray *)tableViewArr{
if (_tableViewArr == nil) {
_tableViewArr = @[[[UITableView alloc] init], [[UITableView alloc] init], [[UITableView alloc] init]];
for (UITableView *tableView in _tableViewArr) {
[tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"DropCell"];
tableView.delegate = self;
tableView.dataSource = self;
tableView.frame = CGRectMake(0, 0, 0, 0);
tableView.backgroundColor = [UIColor whiteColor];
tableView.tableFooterView = [[UIView alloc] init];
tableView.showsVerticalScrollIndicator = NO;
tableView.rowHeight = self.rowHeightNum;
}
}
return _tableViewArr;
}
@end

三 调用控件MenuScreeningView

.h文件

#import <UIKit/UIKit.h>
@interface MenuScreeningView : UIView
#pragma mark - 筛选菜单消失
-(void)menuScreeningViewDismiss;
@end

.m文件

#import "MenuScreeningView.h"
#import "DropMenuView.h"
#define kWidth [UIScreen mainScreen].bounds.size.width
#define kHeight [UIScreen mainScreen].bounds.size.height
@interface MenuScreeningView ()<DropMenuViewDelegate>
@property (nonatomic, strong) UIButton *oneLinkageButton;
@property (nonatomic, strong) UIButton *twoLinkageButton;
@property (nonatomic, strong) UIButton *threeLinkageButton;
@property (nonatomic, strong) DropMenuView *oneLinkageDropMenu;
@property (nonatomic, strong) DropMenuView *twoLinkageDropMenu;
@property (nonatomic, strong) DropMenuView *threeLinkageDropMenu;
@property (nonatomic, strong) NSArray *addressArr;
@property (nonatomic, strong) NSArray *categoriesArr;
@property (nonatomic, strong) NSArray *sortsArr;
@end
@implementation MenuScreeningView
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.oneLinkageButton = [UIButton buttonWithType:UIButtonTypeCustom];
self.oneLinkageButton.frame = CGRectMake(0, 0, kWidth/3, 36);
[self setUpButton:self.oneLinkageButton withText:@"一级"];
self.oneLinkageDropMenu = [[DropMenuView alloc] init];
self.oneLinkageDropMenu.arrowView = self.oneLinkageButton.imageView;
self.oneLinkageDropMenu.delegate = self;
self.twoLinkageButton = [UIButton buttonWithType:UIButtonTypeCustom];
self.twoLinkageButton.frame = CGRectMake(kWidth/3, 0, kWidth/3, 36);
[self setUpButton:self.twoLinkageButton withText:@"二级"];
self.twoLinkageDropMenu = [[DropMenuView alloc] init];
self.twoLinkageDropMenu.arrowView = self.twoLinkageButton.imageView;
self.twoLinkageDropMenu.delegate = self;
self.threeLinkageButton = [UIButton buttonWithType:UIButtonTypeCustom];
self.threeLinkageButton.frame = CGRectMake(2 * kWidth/3, 0, kWidth/3, 36);
[self setUpButton:self.threeLinkageButton withText:@"三级"];
self.threeLinkageDropMenu = [[DropMenuView alloc] init];
self.threeLinkageDropMenu.arrowView = self.threeLinkageButton.imageView;
self.threeLinkageDropMenu.delegate = self;
/** 最下面横线 */
UIView *horizontalLine = [[UIView alloc] initWithFrame:CGRectMake(0, self.frame.size.height - 0.6, kWidth, 0.6)];
horizontalLine.backgroundColor = [UIColor colorWithWhite:0.8 alpha:1.000];
[self addSubview:horizontalLine];
}
return self;
}
#pragma mark - 按钮点击推出菜单 (并且其他的菜单收起)
-(void)clickButton:(UIButton *)button{
if (button == self.oneLinkageButton) {
[self.twoLinkageDropMenu dismiss];
[self.threeLinkageDropMenu dismiss];
[self.oneLinkageDropMenu creatDropView:self withShowTableNum:1 withData:self.sortsArr];
}else if (button == self.twoLinkageButton){
[self.oneLinkageDropMenu dismiss];
[self.threeLinkageDropMenu dismiss];
[self.twoLinkageDropMenu creatDropView:self withShowTableNum:2 withData:self.categoriesArr];
}else if (button == self.threeLinkageButton){
[self.oneLinkageDropMenu dismiss];
[self.twoLinkageDropMenu dismiss];
[self.threeLinkageDropMenu creatDropView:self withShowTableNum:3 withData:self.addressArr];
}
}
#pragma mark - 筛选菜单消失
-(void)menuScreeningViewDismiss{
[self.oneLinkageDropMenu dismiss];
[self.twoLinkageDropMenu dismiss];
[self.threeLinkageDropMenu dismiss];
}
#pragma mark - 协议实现
-(void)dropMenuView:(DropMenuView *)view didSelectName:(NSString *)str{
if (view == self.oneLinkageDropMenu) {
[self.oneLinkageButton setTitle:str forState:UIControlStateNormal];
[self buttonEdgeInsets:self.oneLinkageButton];
}else if (view == self.twoLinkageDropMenu){
[self.twoLinkageButton setTitle:str forState:UIControlStateNormal];
[self buttonEdgeInsets:self.twoLinkageButton];
}else if (view == self.threeLinkageDropMenu){
[self.threeLinkageButton setTitle:str forState:UIControlStateNormal];
[self buttonEdgeInsets:self.threeLinkageButton];
}
}
#pragma mark - 设置Button
-(void)setUpButton:(UIButton *)button withText:(NSString *)str{
[button addTarget:self action:@selector(clickButton:) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:button];
[button setTitle:str forState:UIControlStateNormal];
button.titleLabel.font = [UIFont systemFontOfSize:11];
button.titleLabel.lineBreakMode = NSLineBreakByTruncatingTail;
[button setTitleColor:[UIColor colorWithWhite:0.3 alpha:1.000] forState:UIControlStateNormal];
[button setImage:[UIImage imageNamed:@"downarr"] forState:UIControlStateNormal];
[self buttonEdgeInsets:button];
UIView *verticalLine = [[UIView alloc]init];
verticalLine.backgroundColor = [UIColor colorWithWhite:0.9 alpha:1.0];
[button addSubview:verticalLine];
verticalLine.frame = CGRectMake(button.frame.size.width - 0.5, 3, 0.5, 30);
}
-(void)buttonEdgeInsets:(UIButton *)button{
[button setTitleEdgeInsets:UIEdgeInsetsMake(0, -button.imageView.bounds.size.width + 2, 0, button.imageView.bounds.size.width + 10)];
[button setImageEdgeInsets:UIEdgeInsetsMake(0, button.titleLabel.bounds.size.width + 10, 0, -button.titleLabel.bounds.size.width + 2)];
}
#pragma mark - 懒加载
-(NSArray *)addressArr{
if (_addressArr == nil) {
NSDictionary *dic = [NSDictionary dictionaryWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"address.plist" ofType:nil]];
_addressArr = dic[@"address"];
}
return _addressArr;
}
-(NSArray *)categoriesArr{
if (_categoriesArr == nil) {
_categoriesArr = [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"categories.plist" ofType:nil]];
}
return _categoriesArr;
}
-(NSArray *)sortsArr{
if (_sortsArr == nil) {
_sortsArr = [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"sorts.plist" ofType:nil]];
}
return _sortsArr;
}
@end

四 调用

MenuScreeningView *menuScreening = [[MenuScreeningView alloc] initWithFrame:CGRectMake(0, 64, kWidth, 36)];
[self.view addSubview:menuScreening];
menuScreening.backgroundColor = [UIColor whiteColor];

五 效果图

六 demo下载

因为数据源 无法上次上传[简书], 所以上传个demo, 细节方面, 可能有未注意地方,仅供参考.

传送门 : LinkageMenu_jb51.rar

只要大家认真看完上面技术狗小编为各位分享的iOS 三级下拉菜单功能实现,大家都能轻松掌握,赶紧动手试试吧,让你的知识增加吧。

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