¿Cómo cambio el color del texto en UIPickerView en iOS 7?

objective-c uiview

Question

pickerView:viewForRow:forComponent:reusingView método pickerView:viewForRow:forComponent:reusingView , pero cuando uso la view pasa al reusingView: ¿cómo lo cambio para usar un color de texto diferente? Si utilizo view.backgroundColor = [UIColor whiteColor]; ninguna de las vistas aparece más.

Answer 1

Swift 4 (Actualización a la respuesta aceptada)

extension MyViewController: UIPickerViewDelegate{
}
func pickerView(_ pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? {
return NSAttributedString(string: "your-title-goes-here", attributes: [NSAttributedStringKey.foregroundColor: UIColor.white])
}
}

Answer 2

Esto funcionará:

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row
forComponent:(NSInteger)component reusingView:(UIView *)view
{
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0,
pickerView.frame.size.width, 44)];
label.backgroundColor = [UIColor grayColor];
label.textColor = [UIColor whiteColor];
label.font = [UIFont fontWithName:@"HelveticaNeue-Bold" size:18];
label.text = [NSString stringWithFormat:@" %d", row+1];
return label;
}
// total Components
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 1;
}
// total rows In Component
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:
(NSInteger)component
{
return 6;
}

Answer 3

Hay una función en el método de delegado que es más elegante:

C objetivo:

- (NSAttributedString *)pickerView:(UIPickerView *)pickerView attributedTitleForRow:(NSInteger)row forComponent:(NSInteger)component
{
NSString *title = @"sample title";
NSAttributedString *attString =
[[NSAttributedString alloc] initWithString:title attributes:@{NSForegroundColorAttributeName:[UIColor whiteColor]}];
return attString;
}

Si también desea cambiar los colores de la barra de selección, descubrí que tenía que agregar 2 UIViews separados a la vista que contenía UIPickerView , separados por 35 pts para una altura de selector de 180.

Swift 3:

func pickerView(_ pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? {
let string = "myString"
return NSAttributedString(string: string, attributes: [NSForegroundColorAttributeName:UIColor.white])
}

Swift 4:

func pickerView(_ pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? {
let string = "myString"
return NSAttributedString(string: string, attributes: [NSAttributedStringKey.foregroundColor: UIColor.white])
}

Recuerde cuando usa el método: No necesita implementar titleForRowInComponent() ya que nunca se llama cuando se usa attributedTitleForRow() .

Answer 4

Me encontré con el mismo problema con un selector que usa dos componentes. Mi solución es similar a la anterior con algunas modificaciones. Debido a que estoy usando dos componentes, es necesario extraer de dos matrices diferentes.

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view{
UILabel *label = [[UILabel alloc] init];
label.backgroundColor = [UIColor blueColor];
label.textColor = [UIColor whiteColor];
label.font = [UIFont fontWithName:@"HelveticaNeue-Bold" size:18];
//WithFrame:CGRectMake(0, 0, pickerView.frame.size.width, 60)];
if(component == 0)
{
label.text = [countryArray objectAtIndex:row];
}
else
{
label.text = [cityArray objectAtIndex:row];
}
return label;
}

Answer 5

en Xamarin, anule el método UIPickerModelView GetAttributedTitle

public override NSAttributedString GetAttributedTitle(UIPickerView picker, nint row, nint component)
{
// change text white
string title = GetTitle (picker, row, component); // get current text from UIPickerViewModel::GetTitle
NSAttributedString ns = new NSAttributedString (title, null, UIColor.White); // null = font, use current font
return ns;
}

Answer 6

publicación original [aquí] ( ¿puedo cambiar el color de fuente de datePicker en iOS7? )

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, pickerView.frame.size.width, 44)];
label.backgroundColor = [UIColor grayColor];
label.textColor = [UIColor whiteColor];
label.font = [UIFont fontWithName:@"HelveticaNeue-Bold" size:18];
label.text = [NSString stringWithFormat:@" %d", row+1];
return label;
}
// number Of Components
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 1;
}
// number Of Rows In Component
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent: (NSInteger)component
{
return 6;
}

Answer 7

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
UILabel* pickerLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, pickerView.frame.size.width, 37)];
pickerLabel.text = @"text";
pickerLabel.textColor = [UIColor redColor];
return pickerLabel;
}

Answer 8

1. Go to storyboard
2. Select PickerView
3. Go to Identity inspector (3rd tab)
4. Add User Defined Runtime Attribute
5. KeyPath = textColor
6. Type = Color
7. Value = [Color of you choice]