从原型uicollectionviewcell内的文本字段获取数据 [英] Getting data from a textfield inside a prototype uicollectionviewcell

问题描述

我有一个UICollectionViewCell这是原型单元，其中有一个文本字段，默认情况下所有这些字段中都有. (这就是我想要的).我希望当用户在这些文本字段中输入一个值时能够检索数据以及将数据放入其中的单元格(也许是行号).我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?

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;

}

推荐答案

实现委托方法(void)textViewDidChange:(UITextView *)textView .您可以使用textView的tag属性来区分更改了哪一个.

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;
}

更新！
这是一种使用关联对象而不是标签的方法.

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

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