Plusieurs lignes de Sélection dans UIPickerView

Vous pouvez le faire sans UITableView, en utilisant seulement UITapGestureRecognizer 🙂

Également, ajouter NSMutableArray *selectedItems quelque part dans votre .h fichier.

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
UITableViewCell *cell = (UITableViewCell *)view;
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:nil];
[cell setBackgroundColor:[UIColor clearColor]];
[cell setBounds: CGRectMake(0, 0, cell.frame.size.width -20 , 44)];
UITapGestureRecognizer *singleTapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(toggleSelection:)];
singleTapGestureRecognizer.numberOfTapsRequired = 1;
[cell addGestureRecognizer:singleTapGestureRecognizer];
}
if ([selectedItems indexOfObject:[NSNumber numberWithInt:row]] != NSNotFound) {
[cell setAccessoryType:UITableViewCellAccessoryCheckmark];
} else {
[cell setAccessoryType:UITableViewCellAccessoryNone];
}
cell.textLabel.text = [datasource objectAtIndex:row];
cell.tag = row;
return cell;
}
- (void)toggleSelection:(UITapGestureRecognizer *)recognizer {
NSNumber *row = [NSNumber numberWithInt:recognizer.view.tag];
NSUInteger index = [selectedItems indexOfObject:row];
if (index != NSNotFound) {
[selectedItems removeObjectAtIndex:index];
[(UITableViewCell *)(recognizer.view) setAccessoryType:UITableViewCellAccessoryNone];
} else {
[selectedItems addObject:row];
[(UITableViewCell *)(recognizer.view) setAccessoryType:UITableViewCellAccessoryCheckmark];
}
}

OriginalL'auteur suda

Le code suivant fonctionne pour iOS 10. Je n'ai pas eu la chance de le tester sur les anciennes versions, mais je pense que cela devrait fonctionner. L'idée est similaire à @suda est un, mais il ajoute un seul robinet de reconnaissance directement sur le sélecteur de vue au lieu d'ajouter le robinet de reconnaissance de chaque rangée, comme cela ne fonctionne pas sur iOS7+.

Par souci de concision, je n'ai pas inclure l'intégralité de la mise en œuvre de la UIPickerViewDataSource et UIPickerViewDelegate protocoles, seuls les éléments pertinents pour mettre en œuvre la sélection multiple.

//1. Conform to UIGestureRecognizerDelegate protocol
@interface MyViewController () <UIPickerViewDataSource, UIPickerViewDelegate, UIGestureRecognizerDelegate>
@property (nonatomic, strong) NSMutableArray *selectedArray;    //To store which rows are selected
@property (nonatomic, strong) NSArray *dataArray;           //Picker data
@property (weak, nonatomic) IBOutlet UIPickerView *pickerView;
@end
@implementation MyViewController
- (void)viewDidLoad 
{    
[super viewDidLoad];
self.selectedArray = [NSMutableArray array]; 
self.dataArray = @[@"Option 1", @"Option 2", @"Option 3", @"Option 4"];
//2. Add tap recognizer to your picker view
UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(pickerTapped:)];
tapRecognizer.delegate = self;
[self.pickerView addGestureRecognizer:tapRecognizer];
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
return true;
}
- (void)pickerTapped:(UITapGestureRecognizer *)tapRecognizer
{
//3. Find out wich row was tapped (idea based on https://stackoverflow.com/a/25719326) 
if (tapRecognizer.state == UIGestureRecognizerStateEnded) {
CGFloat rowHeight = [self.pickerView rowSizeForComponent:0].height;
CGRect selectedRowFrame = CGRectInset(self.pickerView.bounds, 0.0, (CGRectGetHeight(self.pickerView.frame) - rowHeight) / 2.0 );
BOOL userTappedOnSelectedRow = (CGRectContainsPoint(selectedRowFrame, [tapRecognizer locationInView:self.pickerView]));
if (userTappedOnSelectedRow) {
NSInteger selectedRow = [self.pickerView selectedRowInComponent:0];
NSUInteger index = [self.selectedArray indexOfObject:[NSNumber numberWithInteger:selectedRow]];
if (index != NSNotFound) {
NSLog(@"Row %ld OFF", (long)selectedRow);
[self.selectedArray removeObjectAtIndex:index];
} else {
NSLog(@"Row %ld ON",  (long)selectedRow);
[self.selectedArray addObject:[NSNumber numberWithInteger:selectedRow]];
}
//I don't know why calling reloadAllComponents sometimes scrolls to the first row
//[self.pickerView reloadAllComponents];
//This workaround seems to work correctly:
self.pickerView.dataSource = self;            
NSLog(@"Rows reloaded");
}
}
}
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view 
{    
//4. Customize your Picker row as needed. 
//This is a very simple view just to make the point
UILabel *pickerLabel = (UILabel *)view;
if (pickerLabel == nil) {
pickerLabel = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 0.0, 400, 32)];
}
BOOL isSelected = [self.selectedArray indexOfObject:[NSNumber numberWithInteger:row]] != NSNotFound;
NSString *text = [self.dataArray objectAtIndex:row];
text = [text stringByAppendingString:isSelected ? @"☒ " : @"☐ "];
[pickerLabel setText:text];
return pickerLabel;
}
//Do not forget to add the remaining methods to conform the UIPickerViewDataSource and UIPickerViewDelegate protocols!
@end

OriginalL'auteur Paglian

même de résoudre swift 4 pour cette cas

  //set up tap gesture
let tapGestureRecognaizer = UITapGestureRecognizer(target: self, action: #selector(pickerTapp))
tapGestureRecognaizer.delegate = self
tapGestureRecognaizer.numberOfTapsRequired = 2
self.pickerView.addGestureRecognizer(tapGestureRecognaizer)
@objc func pickerTapp(tapGesture: UITapGestureRecognizer) {
if tapGesture.state == .ended {
//looking for frame selection row
let selectedItem = dataSource2[pickerView.selectedRow(inComponent: 1)]
let rowHeight = self.pickerView.rowSize(forComponent: 1).height
let rowWidth = self.pickerView.rowSize(forComponent: 1).width
let selectRowFrame = CGRect(x: CGFloat(Int(self.pickerView.frame.width) / self.pickerView.numberOfComponents), y: (self.pickerView.frame.height - rowHeight) / 2, width: rowWidth, height: rowHeight)
let userTappedOnSelectedRow = selectRowFrame.contains(tapGesture.location(in: self.pickerView))
//if tap to selection row ....
if userTappedOnSelectedRow {
if selectedArray.contains(selectedItem) {
var index = 0
for item in selectedArray {
if item == selectedItem {
selectedArray.remove(at: index)
} else {
index += 1
}
}
} else {
selectedArray.append(selectedItem)
}
}
//reload Data
self.pickerView.dataSource = self
self.pickerView.selectRow(selectedRow, inComponent: 1, animated: false)
self.pickerView(self.pickerView, didSelectRow: selectedRow, inComponent: 1)
}

plein résoudre: https://github.com/akonoplev/Features/blob/master/MultiSelectUIPickerView/MultiSelectUIPickerView/ViewController.swift

OriginalL'auteur akonoplev