ios两视图间托付（delegate）传值

现有两个视图（ViewController。ViewController1），从ViewController中带參数跳转到ViewController1，在ViewController1选中数据后带有效数据后退到ViewController中。托付实现上述功能。

项目：点击下载

一、ViewController主要代码

// button点击事件

-(IBAction)clickSearchBtn:(id)sender {

    [[[UIApplication sharedApplication] keyWindow] endEditing:YES];

    ViewController1 *_viewController = [[[ViewController1 alloc] init] autorelease];

    _viewController.delegate = self;

    _viewController.transText = self.textField.text;

    [self.navigationController pushViewController:_viewController animated:YES];

}

// ViewController1Delegate 的代理方法

-(void)selectData:(NSString*)text{

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

        [self.listArray removeAllObjects];

        for (int i=0; i<5; i++) {

            [self.listArray addObject:[NSString stringWithFormat:@"第%d行数据：%@_%d",i+1,text,arc4random_uniform(100)]];

        }

        dispatch_async(dispatch_get_main_queue(), ^{

            [self.dataTableView reloadData];

        });

    });

}

二、ViewController1主要代码

// ViewController1.h

// delegate写在#import之前，否则可能会Delegate Cannot find protocol declaration

@protocol ViewController1Delegate;

@protocol ViewController1Delegate <NSObject>

@optional

-(void)selectData:(NSString*)text;

@end

// ViewController1.m

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

    if ([self.delegate respondsToSelector:@selector(selectData:)]) {

        //通过托付协议传值

        [self.delegate selectData:[self.listArray objectAtIndex:indexPath.row]];

        [self.navigationController popViewControllerAnimated:YES];

    }

}

三、效果图