我有一个 UICollectionViewCell，它是原型(prototype)单元格，里面有一个文本字段，默认情况下它存在于所有单元格中。 (这就是我想要的)。我希望能够在用户在这些文本字段中输入值时能够检索数据和数据放入的单元格(可能是行号)。我已经看到了其他一些相关问题，但似乎没有一个对我有用。有什么想法吗？

@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;

}

最佳答案

实现委托(delegate)方法(void)textViewDidChange:(UITextView *)textView 。您可以使用 textView 的 tag 属性来区分更改的是哪一个。

- (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;
}

更新!
这是一种使用关联对象而不是标签的方法。

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

关于ios - 从原型(prototype) uicollectionviewcell 中的文本字段获取数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22963192/