如何创建转场以从表视图推回编辑模式? [英] How to to create a segue to push back to editing mode from a table view?

问题描述

也许我在标题中没有问到，抱歉，我是初学者，所以我自己解释一下:

Maybe I didn't ask it right in the title, sorry for this, i'm a beginner so I will explain myself:

我有两个屏幕:1. 创建笔记 - 此屏幕有一个视图控制器、TextView 和导航(带创建/取消).2. 笔记页面——这个屏幕有一个表格视图控制器和一个带有加号按钮的导航.(非常类似于苹果笔记应用)

I have 2 screens: 1. Create notes - this screen have a view controller, TextView and navigation(with create/cancel). 2. Notes page - this screen have a table view controller and a navigation with a plus button. (very similar to apple notes app)

我希望在表格视图中，每当我单击一个单元格时，它都会带我回到此笔记的可编辑页面...

I want that in the table view, whenever I click a cell it will take me back to the editable page of this note...

所以我添加了一个从单元格到笔记页面的推送segue，每次我点击一个单元格时它都会打开一个新的笔记页面......所以我知道我在这里遗漏了一些东西，如果你能帮我弄清楚，我将不胜感激

So I added a push segue from the cell to the notes page, and every time I'm clicking on a cell it opens a NEW note page... So I know i'm missing something here and would really appreciate if you can help me figure it out

这是我的表视图控制器 .m 文件:

This is my table view controller .m file:

#import "NMNotesListViewController.h"
#import "NMCreateNotesViewController.h"

@interface NMNotesListViewController ()

@property (strong, nonatomic) NSMutableArray *notes;

@end

@implementation NMNotesListViewController


- (IBAction) unwindToList: (UIStoryboardSegue *) segue
{

    NMCreateNotesViewController *source = [segue sourceViewController];
    NMNote *note = source.note;

    if (note != nil) {
        [self.notes addObject:note];
        [self.tableView reloadData];
    }

}

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.notes = [[NSMutableArray alloc] init];

    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    return [self.notes count];
}

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

    // Configure the cell...


    NMNote *note = [self.notes objectAtIndex:indexPath.row];
    cell.textLabel.text = note.content;


    return cell;
}

@end

这是我的视图控制器(创建笔记).m 文件:

And this is my view controller (create notes) .m file:

#import "NMCreateNotesViewController.h"

@interface NMCreateNotesViewController ()

@property (weak, nonatomic) IBOutlet UIBarButtonItem *createButton;

@property (weak, nonatomic) IBOutlet UITextView *textField;

@end

@implementation NMCreateNotesViewController

- (void)registerForKeyboardNotifications
{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasShown:) name:UIKeyboardDidShowNotification object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillBeHidden:) name:UIKeyboardWillHideNotification object:nil];

}

- (void)keyboardWasShown:(NSNotification*)aNotification {
    NSDictionary* info = [aNotification userInfo];
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    CGRect bkgndRect = self.textField.superview.frame;
    bkgndRect.size.height += kbSize.height;
    [self.textField.superview setFrame:bkgndRect];
    [self.textField setContentOffset:CGPointMake(0.0, self.textField.frame.origin.y-kbSize.height) animated:YES];
}


- (void) keyboardWillBeHidden: (NSNotification *) aNotification
{
    UIEdgeInsets contentInsets = UIEdgeInsetsZero;

    self.textField.contentInset = contentInsets;

    self.textField.scrollIndicatorInsets = contentInsets;
}


- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if (sender != self.createButton) return;
    if (self.textField.text.length > 0) {
        self.note = [[NMNote alloc] init];
        self.note.content = self.textField.text;

    }
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

推荐答案

@jeely 很接近但是你需要做的是，创建一个从 viewController 到 <代码>视图控制器.

@jeely was close but what you need to do is , create a segue from viewController to viewController.

在 tableView 委托 didSelectRowAtIndexPath 中，您将执行转场:

In the tableView delegate didSelectRowAtIndexPath you would preform the segue:

 -(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
   [self performSegueWithIdentifier:@"yourSegue" sender:sender];
 }

因为您想将注释传递给下一个控制器，所以您需要在 prepareForSegue 方法中执行此操作:

Because you want to pass the note to the next controller you will need to do that in the prepareForSegue method:

 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Make sure your segue name in storyboard is the same as this line
    if ([[segue identifier] isEqualToString:@"yourSegue"])
    {  
       //get the note
       NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
       NMNote *note = [self.notes objectAtIndex:indexPath.row];
       //set the note
       NMCreateNotesViewController *createVC = (NMCreateNotesViewController*)segue.destinationViewController;
       createVC.noteToDisplay = note.content;
    }
}

最后，noteToDisplay 只是一个 NSString 属性，一旦执行 segue，您将设置为 textView 属性.

Finally noteToDisplay is just an NSString property that you will set to the textView property once the segue is performed.

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