分离tableView的DataSource

MVC下分离tableView的Datasource
封装一个继承与NSObject的ArrayDataSource类来专门处理tableView的数据

代码如下:
ArrayDataSource.h中

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

typedef void (^TableViewCellConfigureBlock)(id cell, id item);


@interface ArrayDataSource : NSObject <UITableViewDataSource>

- (id)initWithItems:(NSArray *)anItems
     cellIdentifier:(NSString *)aCellIdentifier
 configureCellBlock:(TableViewCellConfigureBlock)aConfigureCellBlock;

//用于取出当前Cell的model 
- (id)itemAtIndexPath:(NSIndexPath *)indexPath;

@end

ArrayDataSource.m中

#import "ArrayDataSource.h"


@interface ArrayDataSource ()

@property (nonatomic, strong) NSArray *items;
@property (nonatomic, copy) NSString *cellIdentifier;
@property (nonatomic, copy) TableViewCellConfigureBlock configureCellBlock;

@end


@implementation ArrayDataSource

- (id)init
{
    return nil;
}

- (id)initWithItems:(NSArray *)anItems
     cellIdentifier:(NSString *)aCellIdentifier
 configureCellBlock:(TableViewCellConfigureBlock)aConfigureCellBlock
{
    self = [super init];
    if (self) {
        self.items = anItems;
        self.cellIdentifier = aCellIdentifier;
        self.configureCellBlock = [aConfigureCellBlock copy];
    }
    return self;
}

- (id)itemAtIndexPath:(NSIndexPath *)indexPath
{
    return self.items[(NSUInteger) indexPath.row];
}


#pragma mark UITableViewDataSource

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return self.items.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:self.cellIdentifier
                                                            forIndexPath:indexPath];
    id item = [self itemAtIndexPath:indexPath];
    self.configureCellBlock(cell, item);
    return cell;
}

@end

实现代码:

static NSString * const PhotoCellIdentifier = @"PhotoCell";

- (void)setupTableView
{
    TableViewCellConfigureBlock configureCell = ^(UITableViewCell *cell, NSString *str) {
        
        cell.textLabel.text = str;
    };
// Demo 中简单起见传的字符串, 一般是传Model的
    NSArray *photos = @[@"jiang",@"yong",@"chang"];
    self.photosArrayDataSource = [[ArrayDataSource alloc] initWithItems:photos
                                                         cellIdentifier:PhotoCellIdentifier
                                                     configureCellBlock:configureCell];
    self.dataSource = self.photosArrayDataSource;
    
    [self registerClass:[UITableViewCell class] forCellReuseIdentifier:PhotoCellIdentifier];
//    [self.tableView registerNib:[PhotoCell nib] forCellReuseIdentifier:PhotoCellIdentifier];
}


-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    
    NSString *pasStr = [self.photosArrayDataSource itemAtIndexPath:indexPath];
    
    if ([self.myDelegate respondsToSelector:@selector(passStrToController:)]) {
        
        [self.myDelegate passStrToController:pasStr];
    }
}

但是有一个问题###

   Demo中把tableView和Controller分离了开来,导致处理数据
   NSArray *photos = @[@"jiang",@"yong",@"chang"];
   只能在tableView中赋值, 

   而不能从controller中传递过来
  // NSArray *photos = self.dataArray;

  原因:在初始化的时候已经给NSArray *photos赋值了, 而当时还没有传值,所以为空.

所以最好在UITableViewController中使用####

Demo下载地址

参考文章(英文)