需求：用tableview做選擇框，選中打勾，可單選、多選、全選、全不選等。

需要在一堆複用的自定義cell中 點選一個cell 在當前cell顯示選中按鈕

如果單純的在cell裡新增Btn再在didselect方法中去修改按鈕狀態,那麼就會出現別的cell中也出現了一個選中的按鈕.

這是由於cell的複用導致的

為了避免這個情況,這裡的思路就是,

1.在cell中新增按鈕,並且為按鈕新增代理方法返回控制器

2.為cell建立一個Model ,model裡面除了常規的顯示資料外,還要預留一個Index 用來標記每個cell中的Btn.tag (這樣的好處是,即使UI中cell複用了,但是每次點選的cell中的btn.tag是唯一的)

3.為cell預留一個SelectArray陣列公共屬性,通過 [tbaleView reloadData];方法來設定按鈕狀態

cell的程式碼：

#import <UIKit/UIKit.h>
#import "UserModel.h"
@protocol ReportUsersCellDelegate<NSObject>

- (void)didSelectCell:(UITableViewCell *)cell withIsSelect:(BOOL)isSelect;

@end

@interface ReportUsersCell : UITableViewCell
@property (strong, nonatomic)UserModel *model;
@property (weak, nonatomic)id<ReportUsersCellDelegate>delegate;
@property (weak, nonatomic) IBOutlet UIButton *checkBtn;
@property (weak, nonatomic) IBOutlet UILabel *userLB;
@end
 

#import "ReportUsersCell.h"

@implementation ReportUsersCell

- (void)awakeFromNib {
    [super awakeFromNib];
    // Initialization code
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
    [super setSelected:selected animated:animated];

    // Configure the view for the selected state
}
- (void)setModel:(UserModel *)model{
    
    _model = model;
    
    self.userLB.text = _model.userName;
    
    if (_model.isSelect==NO) {
        
        self.checkBtn.selected = NO;
        [self.checkBtn setImage:[UIImage imageNamed:@"square_off"] forState:UIControlStateNormal];
    }else{
        [self.checkBtn setImage:[UIImage imageNamed:@"square_on"] forState:UIControlStateNormal];
        self.checkBtn.selected = YES;
    }
}
 

model的程式碼：

#import <Foundation/Foundation.h>

@interface UserModel : NSObject

@property (nonatomic, copy) NSString *userName;
@property (nonatomic, copy) NSString *userCode;
@property (nonatomic, assign) NSInteger index;
@property (nonatomic, assign) BOOL isSelect;
- (instancetype)initWithDict:(NSDictionary *)dict;
@end

#import "UserModel.h"

@implementation UserModel
- (instancetype)initWithDict:(NSDictionary *)dict
{
    if(self = [super init])
    {
        [self setValuesForKeysWithDictionary:dict];
    }
    return self;
}
@end

controller的程式碼：

- (void)loadData
{
    
    NSString *usercode = [JSLDefaults objectForKey:@"usercode"];
    if (usercode==nil||usercode.length==0) {
        return;
    }
    NSDictionary *parameters = @{@"userCode":usercode};
    NSData *data=[NSJSONSerialization dataWithJSONObject:parameters options:NSJSONWritingPrettyPrinted error:nil];
    NSString *jsonStr=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
    NSString *paraStr = [NSString stringWithFormat:@"%@?json=%@",[GlobalPort UsersList],jsonStr];
    NSString *utf = [paraStr stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
    WBREQUEST.url(utf).requestType(WBRequestPost).success(^(NSURLSessionDataTask * task,id responseObject){
        
        NSArray * data = (NSArray *)responseObject;
        //        NSLog(@"一級選單=%@",data);
        self.dataArray = [NSMutableArray array];
        for (NSDictionary *dic in data) {
            
            UserModel *model = [[UserModel alloc] initWithDict:dic];
            model.isSelect = 0;
            [self.dataArray addObject:model];
            
        }
        [self.mainTableView reloadData];
        
    }).failure(^(NSURLSessionDataTask * task,id responseObject){
        
        self.HUD = [[MBProgressHUD alloc] initWithView:self.view];
        [self.HUD setMode:MBProgressHUDModeText];
        [self.view addSubview:self.HUD];
        self.HUD.labelText = @"系統繁忙，請稍後再試";
        [self.HUD showAnimated:YES whileExecutingBlock:^{
            sleep(1);
        } completionBlock:^{
            [self.HUD removeFromSuperview];
            self.HUD = nil;
            
        }];
    }).startRequest();
    [self.mainTableView.mj_header endRefreshing];
    
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    ReportUsersCell *cell = [tableView dequeueReusableCellWithIdentifier:@"ReportUsersCell" forIndexPath:indexPath];
//    cell.userLB.text = [NSString stringWithFormat:@"%@",self.dataArray[indexPath.row][@"userName"]];
    [cell.checkBtn addTarget:self action:@selector(checkBtnClicked:) forControlEvents:UIControlEventTouchUpInside];
    cell.checkBtn.tag = indexPath.row+10;
    cell.model = self.dataArray[indexPath.row];
    cell.delegate = self;
    
    return cell;
}

#pragma mark - 全選
- (IBAction)allCheckBtnClicked:(UIButton *)sender {
    sender.selected = !sender.selected;
    if (sender.selected) {
        [sender setImage:[UIImage imageNamed:@"square_on"] forState:UIControlStateNormal];
        [self.selectedArray removeAllObjects];
        self.selectedArray = [NSMutableArray arrayWithArray:self.dataArray];
        for (int i = 0; i <self.dataArray.count; i ++) {
            UserModel *model = self.dataArray[i];
            model.isSelect = 1;
        }
        
    }else{
        [sender setImage:[UIImage imageNamed:@"square_off"] forState:UIControlStateNormal];
        [self.selectedArray removeAllObjects];
        for (int i = 0; i <self.dataArray.count; i ++) {
            UserModel *model = self.dataArray[i];
            model.isSelect = 0;
        }
    }
    [self.mainTableView reloadData];
}
#pragma mark - 單選
- (void)checkBtnClicked:(UIButton *)sender
{
    UIButton *btn = (UIButton *)[self.view viewWithTag:sender.tag];
    btn.selected = !btn.selected;
    if (btn.selected) {
        [self.selectedArray addObject:self.dataArray[sender.tag-10]];
        UserModel *model = self.dataArray[sender.tag-10];
        model.isSelect = 1;
    }else{
        [self.selectedArray removeObject:self.dataArray[sender.tag-10]];
        UserModel *model = self.dataArray[sender.tag-10];
        model.isSelect = 0;
    }
    [self.mainTableView reloadData];
}
#pragma mark - reportcell delegate
- (void)didSelectCell:(UITableViewCell *)cell withIsSelect:(BOOL)isSelect
{
    
}