我有一个UICollectionViewCell,它是原型单元格,我有一个文本字段,默认情况下存在于所有文本字段中. (这就是我想要的).我希望能够在用户输入这些文本字段中的值时能够检索数据和放入数据的单元格(可能是行的编号).我已经看到了一些其他相关的问题,但似乎没有一个对我有用.有任何想法吗？
@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;
}
解决方法
实现委托方法(void)textViewDidChange：(UITextView *)textView
.您可以使用textView的tag属性来区分哪个更改.
.您可以使用textView的tag属性来区分哪个更改.
- (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;
}
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
