ios - 一个 TableViewController 中的多个 UIPickerView 以编程方式

Question

几天来我一直在尝试这样做，但我找不到可行的方法。我尝试设置它的方式将 pickerviews 加载为文本字段的键盘，这是我想要的，但它没有显示我放入其中的任何数据。有人可以帮助我解决这个问题，或者给我一个链接和例子。感谢任何帮助者。

Answer 1

    UIToolbar *toolbar = [[UIToolbar alloc] init];
    [toolbar setBarStyle:UIBarStyleBlack];
    [toolbar setBarTintColor:[UIColor colorWithRed:237.0/255.0 green:30.0/255.0 blue:36.0/255.0 alpha:1.0]];
    [toolbar sizeToFit];
    UIBarButtonItem *flexButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
    UIBarButtonItem *doneButton =[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(resignKeyboard)];
    
    doneButton.tintColor = [UIColor whiteColor];
    
    NSArray *itemsArray = [NSArray arrayWithObjects:flexButton, doneButton, nil];
    [toolbar setItems:itemsArray];
    
    yourTextField.inputAccessoryView = toolbar;
    UIPickerView *categoryPicker   = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 210, 320, 216)];
    categoryPicker.backgroundColor = [UIColor whiteColor];
    categoryPicker.delegate = self;
    categoryPicker.dataSource = self;
    categoryPicker.tag = 1;
    yourTextField.inputView  = categoryPicker;

在你的 viewdidappear 中写完所有这些代码后，实现你的 pickerview 的委托(delegate)和数据源

pragma mark -UIPickerView 委托(delegate)和数据源

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

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return  yourDataSource.count;
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    return [yourDataSource objectAtIndex:row];
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    yourTextField.text = [yourDataSource objectAtIndex:row];
}

并像那样为完成按钮实现一个选择器

- (void)resignKeyboard
{
    [bloodGroupField resignFirstResponder];
}