如何使用 viewForRow 委托接收对 UIPickerview 的触摸？

Posted 2023-02-24

【中文标题】如何使用 viewForRow 委托接收对 UIPickerview 的触摸？

【英文标题】：How to receive touches on UIPickerview using viewForRow delegate?

【发布时间】：2014-08-06 05:12:45

【问题描述】：

谁能帮帮我。我正在尝试在 UIPickerview（在 ios 7 中）上实现多项选择。由于堆栈溢出的引用很少，我做了如下，

- (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)];
        cell.tag = row;       
        cell.userInteractionEnabled = YES;

        UITapGestureRecognizer *singleTapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(toggleSelection:)];
        singleTapGestureRecognizer.numberOfTapsRequired = 1;
        singleTapGestureRecognizer.delegate= self;
        [cell addGestureRecognizer:singleTapGestureRecognizer];
        [self.doorSelectionPickerView addGestureRecognizer:singleTapGestureRecognizer];
    

    //TO DO FOR CHECKMARK    

    cell.textLabel.text = @"1";

    return cell;

尝试后，它没有收到点击手势，因此toggleSelection方法没有被调用。

注意：UIpickerview 是作为 UITextField 的输入视图给出的

userSafeDoorTextfeild.inputView = [self doorSelectionPickerView];

【参考方案1】：

我解决了这个问题，可以帮助处于这种困境中的人。

-(UIView *)pickerView:(UIPickerView *)pickerView viewForRow:
 (NSInteger)row  forComponent:(NSInteger)component 
 reusingView:(UIView *)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)];
    cell.tag = row;
    cell.userInteractionEnabled = YES;

    UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc]
                                          initWithTarget:self action:@selector(showTimePicker:)];
    [recognizer setNumberOfTapsRequired:1];
    [recognizer setDelegate:self];


    if(pickerView.tag == DOORSELECTION_PICKER_TAG)
        NSLog(@"its door selection category");
        *[pickerView addGestureRecognizer:recognizer];*
    


 

不是将点击手势添加到类范围选择器视图，而是在检查标记后将手势添加到 viewForRow 委托方法中返回的此方法选择器视图对象。