ios中分离dataSource的协议

之前写tableview比较多，所以写了很多重复的DataSource相关的代码，控制器也比较大，所以一直想尝试一种新的写法。好在今天看到了相关的例子。替自己记录下。参考 https://www.cnblogs.com/zhouxihi/p/6204195.html

eg: 1.创建一个继承NSOject的类
2.继承和实现dataSource 协议

#import //不导入这个，报错

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

@interface TabViewDatas : NSObject 

@property (nonatomic,strong) NSArray * datas;
@property (nonatomic,copy) NSString * cellIdentifier;
@property (nonatomic,copy) ConfigTableViewBlock aConfigTableViewBlock;

-(instancetype)initWithDatas:(NSArray *)datas
             cellIdentifiers:(NSString *)identifiers
        ConfigTableViewBlock:(ConfigTableViewBlock)aConfigTableViewBlock;

-(id)itemAtIndexPath:(NSIndexPath *)indexPath;

@end   

@implementation TabViewDatas

-(instancetype)init{
    return nil; //必须为nil
}

-(instancetype)initWithDatas:(NSArray *)datas cellIdentifiers:(NSString *)identifiers ConfigTableViewBlock:(ConfigTableViewBlock)aConfigTableViewBlock{
    
    if (self = [super init]) {
        _datas = datas;
        _cellIdentifier = identifiers;
        _aConfigTableViewBlock = [aConfigTableViewBlock copy];
    }
    return self;
}

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

#pragma mark -tabViewDataSource

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

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    return  1;
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:self.cellIdentifier forIndexPath:indexPath];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:self.cellIdentifier];
    }
    cell.textLabel.textColor = [UIColor redColor];
    cell.textLabel.text = self.datas[indexPath.row];
    
    id item = [self itemAtIndexPath:indexPath];
    self.aConfigTableViewBlock(cell, item);
    
    return cell;
}

@end

//test

@interface ViewController : UIViewController

@end

#import "TabViewDatas.h"
#import "TestViewController.h"

@interface ViewController ()

@property (nonatomic,strong) UITableView * tableView;
@property (nonatomic,strong) NSMutableArray * datas;
@property (nonatomic,strong) TabViewDatas * tabViewDataSource;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.datas = [NSMutableArray array];
    for (NSInteger i = 0; i< 200; i++) {
        NSString *str = [NSString stringWithFormat:@"%ld",i];
        [self.datas addObject:str];
    }
    
    UITableView *tableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];
    self.tableView = tableView;
    
    ConfigTableViewBlock block = ^(UITableViewCell *cell,NSString *str){
        NSLog(@"cell:%@ ,str:%@",cell,str);
    };
    
    [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"];
    
    self.tabViewDataSource = [[TabViewDatas alloc] initWithDatas:self.datas cellIdentifiers:@"cell" ConfigTableViewBlock:block];
    self.tableView.dataSource = self.tabViewDataSource;
    self.tableView.delegate = self;
    [self.view addSubview:self.tableView];
    
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

    TestViewController *testVC = [[TestViewController alloc] init];
    [self presentViewController:testVC animated:YES completion:nil];
}

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    return  100;
}

@interface TestViewController : UIViewController

@end

#import "TabViewDatas.h"


@interface TestViewController ()

@property (nonatomic,strong) UITableView * tableView;
@property (nonatomic,strong) NSArray * datas;
@property (nonatomic,strong) TabViewDatas * tabViewDataSource;

@end

@implementation TestViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor blueColor];
    
    self.datas = @[@"6",@"7",@"8",@"9",@"10"];
    
    UITableView *tableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];
    self.tableView = tableView;
    
    ConfigTableViewBlock block = ^(UITableViewCell *cell,NSString *str){
        NSLog(@"cell:%@ ,str:%@",cell,str);
        //在这里操作cell中的控件，或者给cell中的控件赋值
    };
    
    [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"];
    
    self.tabViewDataSource = [[TabViewDatas alloc] initWithDatas:self.datas cellIdentifiers:@"cell" ConfigTableViewBlock:block];
    self.tableView.dataSource = self.tabViewDataSource;
    [self.view addSubview:self.tableView];
    
}

记录这个，主要是因为他给我提供了一个思路。以后可以在别的地方做出相类似的尝试，再次感谢原创作者。