如何在ios中单击UITextView打开Pickerview（下拉菜单）？

我正在做一个项目，我想添加一个下拉列表来选择类别。 请检查屏幕截图（目前仅限于其

UITextField

）。

当用户单击

UITextField

时，如何在屏幕底部显示PickerView

我试过一些代码，但都不起作用

    - (BOOL) textFieldShouldBeginEditing:(UITextView *)textView
{
    pickrView.frame = CGRectMake(0, 400,self.view.frame.size.width,300);
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:.50];
    [UIView setAnimationDelegate:self];
    pickrView.frame = CGRectMake(0, 200, pickrView.frame.size.width, pickrView.frame.size.height);
    [self.view addSubview:pickrView];
    [UIView commitAnimations];
    return NO;
}

---

单击textfield时，您需要一个pickerview而不是键盘。因此，在创建textfield时，必须将pickerview分配给UITextField的“inputview”属性

让我举个例子来解释一下

首先创建文本字段

- (void)viewDidLoad
{
    [super viewDidLoad];
     UITextField *cellTextField = [[UITextField alloc] init];
     cellTextField.frame = CGRectMake(20, 12, 180, 20);
     cellTextField.inputView = [self createPicker];
}

创建PickerView

- (UIView *)createPicker {

    UIView *pickerView = [[UIView alloc] initWithFrame:CGRectMake(0, self.view.frame.size.height, self.view.frame.size.width, 216)];
    pickerView.backgroundColor = [UIColor colorWithRed:109.0/255.0 green:110.0/255.0 blue:120.0/255.0 alpha:1];

    UIPickerView *picker = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 45, 300, 120)];
    picker.delegate = self;
   [pickerView addSubview:picker];

   return pickerView;

}

---

点击文本字段时，您将获得pickerview。

pickerview是否已添加[self.view addSubview:pickerview]；在动画之前添加