代理和block反向传值

#import "SendViewController.h"

//代理传值
@interface SendViewController ()
{
    UITableView*table;
    NSMutableArray*data;
}
@end

@implementation SendViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    data=[[NSMutableArray alloc]init];
    table=[[UITableView alloc]initWithFrame:self.view.frame style:UITableViewStylePlain];
    table.delegate=self;
    table.dataSource=self;
    [self.view addSubview:table];
    for (int i=0; i<20; i++) {
        
        NSString*string=[[NSString alloc]initWithFormat:@"数据%d",i];
        [data addObject:string];
    }
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [data count];
}

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    
    return 60;
}

-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *str=@"str";
    UITableViewCell*cell=[tableView dequeueReusableCellWithIdentifier:str];
    if (cell==nil) {
        cell =[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:str];
    }
//    cell.selectedBackgroundView = [[UIView alloc] initWithFrame:cell.frame];
    UIImageView *norImage=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 50, 50)];
    [norImage setImage:[UIImage imageNamed:@"image"]];

    cell.textLabel.text=[data objectAtIndex:indexPath.row];
    //点击单元格 变换背景图片
    if ([_indexPath isEqual: indexPath]) {
        
        cell.accessoryType = UITableViewCellAccessoryCheckmark;
        cell.backgroundColor=[UIColor redColor];
        cell.accessoryView=norImage ;

       /* 可以自定义图片  按钮 文本
        cell.accessoryType=btn;
        cell.accessoryType=label;
         */
    }
        else{
        cell.accessoryType = UITableViewCellAccessoryNone;
        cell.backgroundColor=[UIColor whiteColor];
        cell.accessoryView=nil ;
    }
    return cell;
}


-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if ([self.delegate respondsToSelector:@selector(sendInForIdea:)]) {
        
        _indexPath = indexPath;
        [self.delegate sendInForIdea:[data objectAtIndex:indexPath.row]];
        [table reloadData];
        
//      cell.imageView.image=[UIImage imageNamed:@"2"];
        //延迟操作     延迟跳转时间
       [self performSelector:@selector(pressBtn) withObject:nil afterDelay:3];
      
    //点击获取的 cell  cell变色
//    UITableViewCell *cell = [table cellForRowAtIndexPath:indexPath];
//    cell.backgroundColor=[UIColor cyanColor];
    }
}
-(void)pressBtn
{
    
 [self.navigationController popViewControllerAnimated:YES];

}