选择UITextField时如何显示UIPickerView

Question

以下是我迄今所做的截图：

所以我要做的是当你选择“选择一个名字”Textfield我需要一个Picker来显示，输入@“Jack”。

Answer 1

自iOS 3.2起，UITextField支持inputView属性来指定用作键盘的自定义视图，这提供了显示UIPickerView的方法：

您可以使用inputView的{​​{1}}属性，可能与UITextField属性结合使用。您将inputAccessoryView分配给pickerView媒体资源，然后将inputView属性的已完成按钮分配给选择器。

inputAccessoryView

像那样。由于您的UIPickerView *myPickerView = [[UIPickerView alloc] init]; //myPickerView configuration here... myTextField.inputView = myPickerView; 没有返回按钮，因此我不建议您直接关闭视图，这就是为什么我建议使用UIPickerView属性来显示带有完成按钮的工具栏（栏是仅仅为了美学，你也可以只使用一个inputAccessoryView对象：

UIButton

Answer 2

我使用它并发现这比添加子视图和动画UIPicker

更清晰

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
responder = textField;

    if ([textField isEqual:self.txtBirthday]) {
    UIDatePicker *datepicker = [[UIDatePicker alloc] initWithFrame:CGRectZero];
    [datepicker setDatePickerMode:UIDatePickerModeDate];

    textField.inputView = datepicker;
    }

    return YES;
}

Answer 3

它会对你有用..我已经编辑了它。为此你必须为textfield设置委托。并在NIb文件中创建一个UIPIckerView。

- (BOOL) textFieldShouldBeginEditing:(UITextView *)textView
{
    pickrView.frame = CGRectMake(0, 500, pickrView.frame.size.width,    pickrView.frame.size.height);
    [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;
}

Answer 4

好吧，你可以依靠UITextFieldDelegate来处理这种功能。

在

内

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField

是您设置当前UITextField的文字以及初始化和显示UIPickerView的地方。

重要通知：

您可能还想要符合UIPickerViewDelegate。

HTH

Answer 5

<强>夫特：

internal var textFieldHandlerToolBar: UIToolbar = {
    let tb = UIToolbar.init(frame: CGRect.init(origin: .zero, size: CGSize.init(width: UIScreen.main.bounds.width, height: 44.0)))
    let doneBarButton = UIBarButtonItem.init(title: "Done", style: UIBarButtonItemStyle.done, target: self, action: #selector(actionDonePickerSelection))
    tb.setItems([doneBarButton], animated: false)
    return tb
}()

internal var pickerView: UIPickerView = {
    let pv = UIPickerView.init()
    return pv
}()

@objc internal func actionDonePickerSelection() {
     textField.resignFirstResponder()
}

override func viewDidLoad() {
    super.viewDidLoad()
    self.pickerView.delegate = self
    self.pickerView.datasource = self
}

像这样使用：

textField.inputAccessoryView = self.textFieldHandlerToolBar
textField.inputView = self.pickerView

Answer 6

您可以做的是，在UIButton上创建一个包含自定义类型的UITextField。两者都有相同的大小。点击按钮，您可以显示UIPickerView。

Answer 7

ViewController.h

@interface ChangeCurrencyVC : UIViewController <UIPickerViewDataSource, UIPickerViewDelegate>
{
      NSArray *availableCurreniesArray;
}
@property (weak, nonatomic) IBOutlet UITextField *chooseCurrencyTxtFldRef;

<强> ViewController.m

 - (void)viewDidLoad {
[super viewDidLoad];
availableCurreniesArray = @[@"Indian Rupee", @"US Dollar", @"European Union Euro", @"Canadian Dollar", @"Australian Dollar", @"Singapore Dollar", @"British Pound", @"Japanese Yen"];
// Do any additional setup after loading the view.
[self pickerview:self];
}

 #pragma mark -  picker view Custom Method
 -(void)pickerview:(id)sender{
  UIPickerView *pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
pickerView.showsSelectionIndicator = YES;
pickerView.dataSource = self;
pickerView.delegate = self;

// set change the inputView (default is keyboard) to UIPickerView
self.chooseCurrencyTxtFldRef.inputView = pickerView;

// add a toolbar with Cancel & Done button
UIToolbar *toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
toolBar.barStyle = UIBarStyleBlackOpaque;

UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(doneTouched:)];
UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(cancelTouched:)];
// the middle button is to make the Done button align to right
[toolBar setItems:[NSArray arrayWithObjects:cancelButton, [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil], doneButton, nil]];
self.chooseCurrencyTxtFldRef.inputAccessoryView = toolBar;
}
 #pragma mark - doneTouched
- (void)cancelTouched:(UIBarButtonItem *)sender{
// hide the picker view
[self.chooseCurrencyTxtFldRef resignFirstResponder];
 }
  #pragma mark - doneTouched
- (void)doneTouched:(UIBarButtonItem *)sender{
// hide the picker view
[self.chooseCurrencyTxtFldRef resignFirstResponder];
// perform some action
 }
#pragma mark - The Picker Challenge
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
return 1;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
return [availableCurreniesArray count];
}
- (nullable NSString *)pickerView:(UIPickerView *)pickerView titleForRow: (NSInteger)row forComponent:(NSInteger)component{
return availableCurreniesArray[row];
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
self.chooseCurrencyTxtFldRef.text = availableCurreniesArray[row];
}