iOS 下拉菜单（ios二级菜单）

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

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#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

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#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

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

.m文件

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#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

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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.rar

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

原文链接：http://www.jianshu.com/p/180b1e2bcf7b