在我们日常开发的过程中难免会碰到一些选项的需求，下面是我针对我们该次需求做的一个小的Demo，闲话不多说了，上图片，上代码。

这样在我们选择上面一个Cell进行点击的时候，我会通过一个代理把数据传递到下面的页面，下面是代码

//// LCAlertListView.h// MeiMeiDu//// Created by 韩伟佳 on 16/4/6.// Copyright © 2016年 LangCuang. All rights reserved.// #import <UIKit/UIKit.h>@class LCAlertListView; @protocol LCAlertListViewDelegate <NSObject> -(void)alertListView:(LCAlertListView*)view didSelectedRow:(NSInteger)row; @end @interface LCAlertListView : UIView<UITableViewDataSource, UITableViewDelegate> -(instancetype)initWithFrame:(CGRect)frame datas:(NSArray*)datas;-(instancetype)initWithFrame:(CGRect)frame datas:(NSArray*)datas count:(NSArray*)counts;@property(nonatomic, strong) id<LCAlertListViewDelegate> delegate;@end

下面是具体实现

//// LCAlertListView.m// MeiMeiDu//// Created by 韩伟佳 on 16/4/6.// Copyright © 2016年 LangCuang. All rights reserved.// #import "LCAlertListView.h"#import "NoFreeCell.h" static CGFloat TableViewHeight ; @implementation LCAlertListView{ UITableView* mTableView; NSArray* tableData; NSArray* visiableData; NSArray* visiableCount; UIButton* backgroundBtn;} -(instancetype)initWithFrame:(CGRect)frame datas:(NSArray*)datas{ if (self = [super initWithFrame:frame]) { self.backgroundColor = [UIColor clearColor]; backgroundBtn = [[UIButton alloc] initWithFrame:frame]; backgroundBtn.backgroundColor = RGBA(88, 88, 88, 0.8); [backgroundBtn addTarget:self action:@selector(dismiss) forControlEvents:UIControlEventTouchUpInside]; [self addSubview:backgroundBtn]; tableData = datas; TableViewHeight = (datas.count + 1) * 44 + 20; mTableView = [[UITableView alloc] initWithFrame:CGRectMake(0, kScreenHeight, kScreenWidth, TableViewHeight) style:UITableViewStylePlain]; [mTableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"]; mTableView.delegate = self; mTableView.dataSource = self; [self addSubview:mTableView]; [UIView animateWithDuration:.25 animations:^{ [mTableView setFrame:CGRectMake(0, kScreenHeight - TableViewHeight, kScreenWidth, TableViewHeight)]; } completion:^(BOOL finished) { }]; } return self;}-(instancetype)initWithFrame:(CGRect)frame datas:(NSArray*)datas count:(NSArray*)counts{ if (self = [super initWithFrame:frame]) { self.backgroundColor = [UIColor clearColor]; backgroundBtn = [[UIButton alloc] initWithFrame:frame]; backgroundBtn.backgroundColor = RGBA(88, 88, 88, 0.8); [backgroundBtn addTarget:self action:@selector(dismiss) forControlEvents:UIControlEventTouchUpInside]; [self addSubview:backgroundBtn]; visiableData = datas; visiableCount = counts; TableViewHeight = (datas.count + 1) * 44 + 20; mTableView = [[UITableView alloc] initWithFrame:CGRectMake(0, kScreenHeight, kScreenWidth, TableViewHeight) style:UITableViewStylePlain]; [mTableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"]; mTableView.delegate = self; mTableView.dataSource = self; [self addSubview:mTableView]; [UIView animateWithDuration:.25 animations:^{ [mTableView setFrame:CGRectMake(0, kScreenHeight - TableViewHeight, kScreenWidth, TableViewHeight)]; } completion:^(BOOL finished) { }]; } return self;} - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{ if(tableData.count > 0){ return [tableData count]; }else if (visiableCount.count > 0){ return [visiableCount count]; } return nil;} - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ UITableViewCell* cell; NoFreeCell *doubleCell; if([tableData count] <= 3 && [tableData count] > 0){ cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath]; cell.textLabel.text = tableData[indexPath.row]; return cell; }else { static NSString *identifier = @"cell0"; doubleCell =[tableView dequeueReusableCellWithIdentifier:identifier]; if (doubleCell == nil){ doubleCell= [[NoFreeCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier]; doubleCell.visibleRoleLabel.text = visiableData[indexPath.row]; doubleCell.showVisibleRoleLabel.text = visiableCount[indexPath.row]; } return doubleCell; } } -(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{ NSInteger row = indexPath.row; [self dismiss:row];} -(void)dismiss:(NSInteger) row{ if (_delegate && [_delegate respondsToSelector:@selector(alertListView:didSelectedRow:)]) { [_delegate alertListView:self didSelectedRow:row]; } [UIView animateWithDuration:.15 animations:^{ [mTableView setFrame:CGRectMake(0, kScreenHeight, kScreenWidth, TableViewHeight)]; } completion:^(BOOL finished) { [self removeFromSuperview]; }]; } -(void)dismiss{ [UIView animateWithDuration:.15 animations:^{ [mTableView setFrame:CGRectMake(0, kScreenHeight, kScreenWidth, TableViewHeight)]; } completion:^(BOOL finished) { [self removeFromSuperview]; }];}@end

上面的NoFree 文件只是一个自定义的Cell，我们可以根据自己的需求自己设计，就不上传了，最后我们说说用法：

LCAlertListView* alertListView = [[LCAlertListView alloc]initWithFrame:CGRectMake(0, 0, kScreenWidth, kScreenHeight) datas:visibleRoleArray count:visibleRoleCountArray]; alertListView.delegate = self; [[[self.view superview] superview] addSubview:alertListView];

下面是代理传值的使用

#pragma mark - LCAlertListViewDelegate-(void)alertListView:(LCAlertListView *)view didSelectedRow:(NSInteger)row{ if(didSelectedIndex == 0){ testVisibleRole = visibleRoleArray[row]; }else{ testData = datas[row]; } NSIndexPath *indexPath = [NSIndexPath indexPathForRow:didSelectedIndex inSection:0]; [_myTableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];}

这样，我们的AlertTableVIew 就做好了。

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