UITableView中的UIPickerView

Question

首先:我知道有些人已经发布了这样的话题,但没有人在所有这些话题中给出明确答案.

我的应用程序中有一个设置-UITableView.现在我想添加一个TableViewCell,我可以用UIPickerView在一些数字之间进行选择.

在tableView didSelectRowAtIndexPath方法中,我为右侧单元格创建了if语句

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

    if (indexPath.row == 1){

    }
}

如何为此单元格添加UIPickerView？它应该从底部向上滑动,如果有类似"完成"按钮的话会很好.

Answer 1

您是否看过iOS 7发布的示例程序名为DateCell？它使用UIDatePicker,但我发现将其适应常规UIPickerView非常简单.

它完全符合您的描述:使用直接在您正在编辑的行下打开的选择器编辑UITableViewCell.

Answer 2

这也是基于你的另一个问题,所以我也在这里包括这些功能(即开关).

在YourTableViewController.h中

组:

@interface YourTableViewViewController : UITableViewController <UIPickerViewDataSource, UIPickerViewDelegate>

在YourTableViewController.m中

粘贴此代码:

@interface YourTableViewViewController ()
@property NSInteger toggle;
@property (strong, nonatomic) UIPickerView *pickerView;
@end

@implementation YourTableViewViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.toggle = 0;
    self.pickerView = [[UIPickerView alloc] initWithFrame:(CGRect){{0, 0}, 320, 480}];
    self.pickerView.delegate = self;
    self.pickerView.dataSource = self;
    self.pickerView.center = (CGPoint){160, 640};
    self.pickerView.hidden = YES;
    [self.view addSubview:self.pickerView];
}

#pragma mark - Table view data source

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    return 2;    
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if(cell == nil)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
    }
    if(indexPath.row == 0)
    {
        [cell.contentView addSubview:self.mySwitch];
    }
    if(indexPath.row == 1)
    {
        cell.textLabel.textColor = [UIColor darkGrayColor];
        if(self.toggle == 0)
        {
            cell.textLabel.text = @"Choose a number";
        }
        else
        {
            cell.textLabel.text = @"Cancel";
        }
    }
    // Configure the cell...

    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if(indexPath.row == 1)
    {
        if(self.toggle == 0)
        {
            self.toggle = 1;
            [self.tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:YES];
            [self bringUpPickerViewWithRow:indexPath];
        }
        else
        {
            self.toggle = 0;
            [self.tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:YES];
            [self hidePickerView];
        }
    }
}

- (void)bringUpPickerViewWithRow:(NSIndexPath*)indexPath
{
    UITableViewCell *currentCellSelected = [self.tableView cellForRowAtIndexPath:indexPath];
    [UIView animateWithDuration:1.0f
                          delay:0.0f
                        options:UIViewAnimationOptionCurveEaseInOut
                     animations:^
                     {
                         self.pickerView.hidden = NO;
                         self.pickerView.center = (CGPoint){currentCellSelected.frame.size.width/2, self.tableView.frame.origin.y + currentCellSelected.frame.size.height*4};
                     }
                     completion:nil];
}

- (void)hidePickerView
{
    [UIView animateWithDuration:1.0f
                          delay:0.0f
                        options:UIViewAnimationOptionCurveEaseInOut
                     animations:^
     {
         self.pickerView.center = (CGPoint){160, 800};
     }
                     completion:^(BOOL finished)
     {
         self.pickerView.hidden = YES;
     }];
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    self.toggle = 0;
    [self.tableView reloadData];
    [self hidePickerView];
    NSLog(@"row selected:%ld", (long)row);
}

- (NSString*) pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    return [NSString stringWithFormat:@"%d", row+1];
}

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return 10;
}

@end

Tested.

附录:

此外,在你的故事板,改变separator为YourTableView以无(看起来你的情况更好地在这里).

表格视图分隔符:

在viewDidLoad,添加:

self.tableView.separatorStyle = UITableViewCellSeparatorStyleSingleLine;

并在 bringUpPickerViewWithRow

后:

UITableViewCell *currentCellSelected = [self.tableView cellForRowAtIndexPath:indexPath];

加:

self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
[self.tableView setNeedsDisplay];

最后,在hidePickerView,添加:

self.tableView.separatorStyle = UITableViewCellSeparatorStyleSingleLine;
[self.tableView setNeedsDisplay];