Getting data from a textfield inside a prototype uicollectionviewcell

问题:

I have a UICollectionViewCell which is prototype cell, I have a textfield in it, which by default present in all of them. (which is what I want). I want to be able to when the user inputs a value in these textfields to be able to retrieve the data and the cell which the data was put into(maybe the number of the row). I have seen a few other related questions but none seems to work for me. Any ideas?

@interface ViewController () { NSArray *collections, *numbers; NSMutableArray *selectedItemsArray; UICollectionViewCell *cell; UITextView *text1Field; NSIndexPath *indexPath1; }     - (void)viewDidLoad {     [super viewDidLoad];     // Do any additional setup after loading the view, typically from a nib.     collections = [NSArray arrayWithObjects:@"starbucks_coffee.jpg", @"thai_shrimp_cake.jpg", @"vegetable_curry.jpg", @"white_chocolate_donut.jpg", nil];     selectedItemsArray = [NSMutableArray array];     numbers = [NSArray arrayWithObjects:@"1", @"2", @"3", @"4", nil]; }  - (void)didReceiveMemoryWarning {     [super didReceiveMemoryWarning];     // Dispose of any resources that can be recreated. } -(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {     return collections.count; } - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {     static NSString *identifier = @"Cell";      cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];      UIImageView *imageview = (UIImageView *)[cell viewWithTag:100];     text1Field = (UITextView *)[cell viewWithTag:50];      imageview.image = [UIImage imageNamed:[collections objectAtIndex:indexPath.row]];      collectionView.allowsMultipleSelection = YES;      collectionView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"bg2.png"]];        return cell;  }

回答1:

Implement the delegate method (void)textViewDidChange:(UITextView *)textView . You could use the tag property of the textView to distinguish which one was changed.

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {     static NSString *CellIdentifier = @"MySpecialCell";     MySpecialCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];     if (!cell) {         cell = [[MySpecialCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];         cell.mySpecialTextView.delegate = self;     }     cell.mySpecialTextView.tag = indexPath.row;     return cell; }  - (void)textViewDidChange:(UITextView *)textView     int rowOfTextViewThatJustChanged = textView.tag; }

Update!
Here's an approach that uses associated objects instead of tags.

static NSString *const kIndexPathKey = @"indexPathKey";  - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {     static NSString *CellIdentifier = @"MultiSelectCell";     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];     if (!cell) {         cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];         UISwitch *switchView = [[UISwitch alloc] init];         [switchView addTarget:self action:@selector(switchValueChanged:) forControlEvents:UIControlEventValueChanged];         cell.accessoryView = switchView;     }      UISwitch *switchView = (id)cell.accessoryView;     [self setIndexPath:indexPath onSwitch:switchView];     switchView.on = [self isIndexPathSelected:indexPath];      id item = [self itemAtIndexPath:indexPath];     cell.textLabel.text = safePerformSelector(item, self.itemDescriptionSelector);     return cell; }  - (void)switchValueChanged:(UISwitch *)sender {     NSIndexPath *indexPath = [self indexPathOfSwitch:sender];     [self setRowSelected:sender.isOn atIndexPath:indexPath];     [self.delegate didSelectItem:[self itemAtIndexPath:indexPath] atIndexPath:indexPath selected:sender.isOn sender:self]; }  - (void)setIndexPath:(NSIndexPath *)indexPath onSwitch:(UISwitch *)switchView {     [switchView setAssociatedObject:indexPath forKey:kIndexPathKey]; }  - (NSIndexPath *)indexPathOfSwitch:(UISwitch *)switchView {     return [switchView associatedObjectForKey:kIndexPathKey]; }   @implementation NSObject (AssociatedObjects)  - (void)setAssociatedObject:(id)object forKey:(NSString *const)key {     objc_setAssociatedObject(self, (__bridge const void *)(key), object, OBJC_ASSOCIATION_RETAIN_NONATOMIC); }  - (id)associatedObjectForKey:(NSString *const)key {     return objc_getAssociatedObject(self, (__bridge const void *)(key)); }  @end

回答2:

Ok, I have figured out a way for anyone with the same issue. What needs to be done is

1. Have your collectionView in a dedicated UICollectionViewController.
2. Add the delegate method

3. In your textFieldShouldEndEditing:textField method add the following line

   NSIndexPath *indexPath = [self.collectionView indexPathForCell:(UICollectionViewCell*)[[textField superview] superview]];

What is happening here is basically you declaring a NSIndexPath reference which stores the indexPath of the textField. The indexPath will give out a row number by indexpath.row.

Then you can use that data however you want :)

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