将数据从 detailViewController 传回 UITableView [英] Passing data back from detailViewController to UITableView

问题描述

我目前遇到了需要更新的 UITableviewCell 的问题.

I am currently at the issue where I have a UITableviewCell that needs to be updated.

当用户按下 uitableviewcell - THERES ONLY 1!! 时，用户被推送到 UITABLEVIEWCONTROLLER，在那里用户可以选择具有自己标题的多个单元格中的 1 个.

When the user presses on the uitableviewcell - THERES ONLY 1!!, the user is pushed to a UITABLEVIEWCONTROLLER where the user is allowed to select 1 of multiple cells with their own titles.

我需要获取点击的 tableviewcells 标题并将值传递回 parentviewcontroller 并将 1 tableviewcell 的名称更新为用户在推送的 uitableivewcontroller 中点击的名称.

I need to get the clicked tableviewcells title and pass the value back to the parentviewcontroller and update the 1 tableviewcell's name to the one the user clicked in the pushed uitableivewcontroller.

这是父视图控制器的图片...

Here is a picture of the parent viewcontroller...

这是推送的视图控制器的图片....

And heres the picture of the pushed viewcontroller....

昨天早些时候有人告诉我需要授权，但我不确定此时该怎么办:/.

I was told earlier yesterday that delegation would be needed but I am unsure what to do at this point :/.

这是我在父视图控制器中使用的一些代码...

Heres some code I use in the parent viewcontroller...

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    ProblemTypes *view = [[ProblemTypes alloc] init];
    [self.navigationController pushViewController:view animated:YES];

}

我也没有使用故事板，只是一些 xib.

I am also NOT USING storyboards, just a few xibs.

还有在选择单元格时pushviewcontroller弹出到父viewcontroller的代码...

Also heres the code for the pushedviewcontroller to pop to the parent viewcontroller when a cell is selected...

#pragma mark - Table view delegate

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

    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    NSLog(@"Cell's text: %@",cell.textLabel.text);

    [self.navigationController popViewControllerAnimated:YES];
}

谢谢你们！

推荐答案

找到了.... 委托是解决方案... 希望它是最有效的！！！这是委托的代码.

Found it out.... Do delegation was the solution... Just hope it's the MOST EFFICIENT!!! Here's the code for delegation.

首先实现parentViewcontroller的delegate及其方法，还要确保给parentviewcontroller添加委托...

First, implement the delegate of the parentViewcontroller and it's methods, also make sure to add delegation to the parentviewcontroller...

@protocol SendFeedBackDelegate

- (void) didReceiveType:(NSString *) message;

@end
@interface SendFeedBackViewController : UIViewController <SKPSMTPMessageDelegate, UITableViewDataSource,UITableViewDelegate, SendFeedBackDelegate>
{
    NSString *subject;

}

接下来实现方法:- (void) didReceiveType:(NSString *) message;

@implementation SendFeedBackViewController

- (void) didReceiveType:(NSString *) message
{
    subject = message;
    [feedbackTableView reloadData];
    // I reload the data because it is needed when this function is going to be called
    // in the child viewcontroller.... just keep reading :)
}

现在转到 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 以使用此示例和我的项目 :)

Now go to - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath for the use of this example and my project :)

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [feedbackTableView dequeueReusableCellWithIdentifier:CellIdentifier];

    // Configure the cell...

    if (cell == nil)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    // THIS IS THE IMPORTANT PIECE OF CODE YOU NEED TO NOTICE.....
    // it allows for the first thing the tableview cell to be is a static string until subject 
    // it is changed and the user chooses a subject in the childviewcontroller
    if (subject == nil) {
        cell.textLabel.text = @"Select a Product";
    } else {
        cell.textLabel.text = subject;
    }


    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

    return cell;
}

现在，给子视图控制器添加一个协议，让子视图控制器符合父视图控制器

Now, add a protocol to the childviewcontroller to allow the childviewcontroller to conform to the parentviewcontroller

在 childviewcontroller.h 中:添加这几行代码，

In childviewcontroller.h: add these lines of code,

#import "ParentViewController.h"

@protocol SendFeedBackDelegate;

@interface FeedbackTypes : UITableViewController
{
    id<SendFeedBackDelegate> delegate;
}

@property (nonatomic, assign) id<SendFeedBackDelegate> delegate;

现在您已经在父视图控制器中设置了委托......接下来查看相同的文件实现文件 (.m) 并添加以下内容:

Now you have set the delegate in the parent viewcontroller.... Next head over the same files implementation file (.m) and add these:

//Add synthesize just under @implementation "ClassName"

@synthesize delegate;

// I used a uitableviewcontroller for this example so refer to the problem I have above
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    //NSLog(@"Cell's text: %@",cell.textLabel.text);
    [delegate didReceiveType:cell.textLabel.text];
    [self.navigationController popViewControllerAnimated:YES];
}

就是这样!!!!..... :)，希望这是一个简单而基本的教程，这里是一个快照.

And THATS IT!!!!..... :), Hope this was a simple and basic tutorial and here's a snapshot.

这篇关于将数据从 detailViewController 传回 UITableView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！