如何在 iOS 7 的 UIPickerView 中更改文本字体？

How can I change text font in UIPickerView in iOS 7?

提问by user3121912

I was able to change my font color but I also need to change font size, how can I accomplish that? Here's my code for chaning the color,

我可以更改字体颜色，但还需要更改字体大小，我该如何实现？这是我改变颜色的代码，

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

    return attString;
 }

UPDATE: this didn't work:

更新：这不起作用：

 NSAttributedString *attString = [[NSAttributedString alloc] initWithString:title attributes:@{NSForegroundColorAttributeName:[UIColor whiteColor], NSFontAttributeName: [UIFont fontWithName:@"HelveticaNeue-Light" size:40]}];

回答by mak

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
    UILabel* tView = (UILabel*)view;
    if (!tView)
    {
       tView = [[UILabel alloc] init];
       [tView setFont:[UIFont fontWithName:@"Helvetica" size:14]];
       //[tView setTextAlignment:UITextAlignmentLeft];
       tView.numberOfLines=3;
    }
    // Fill the label text here
    tView.text=[wishvalues objectAtIndex:row];
   return tView;
}

回答by Richard Bown

Here's the Swift version tested on iOS8:

这是在 iOS8 上测试的 Swift 版本：

Update in Swift for iOS8, you can add this to your delegate:

在 Swift for iOS8 中更新，您可以将其添加到您的委托中：

func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView!) -> UIView {

    var pickerLabel = view as? UILabel;

    if (pickerLabel == nil)
    {
        pickerLabel = UILabel()

        pickerLabel?.font = UIFont(name: "Montserrat", size: 16)
        pickerLabel?.textAlignment = NSTextAlignment.Center
    }

    pickerLabel?.text = fetchLabelForRowNumber(row)

    return pickerLabel!;
}

回答by Christopher Pickslay

Updated for Swift 4:

为 Swift 4 更新：

public func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
    let label = view as? UILabel ?? UILabel()
    label.font = .systemFont(ofSize: 16)
    label.textColor = .white
    label.textAlignment = .center
    label.text = text(for: row, for: component)
    return label
}

回答by the1pawan

You need to implement pickerView:viewForRow:forComponent:reusingView:method in picker's delegate

您需要pickerView:viewForRow:forComponent:reusingView:在选择器的委托中实现方法

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view{
    UILabel* lbl = (UILabel*)view;
    // Customise Font 
    if (lbl == nil) {
          //label size
          CGRect frame = CGRectMake(0.0, 0.0, 70, 30);

          lbl = [[UILabel alloc] initWithFrame:frame];

          [lbl setTextAlignment:UITextAlignmentLeft];

          [lbl setBackgroundColor:[UIColor clearColor]];
           //here you can play with fonts
          [lbl setFont:[UIFont fontWithName:@"Times New Roman" size:14.0]];

   }
      //picker view array is the datasource
   [lbl setText:[pickerViewArray objectAtIndex:row]];


        return lbl;
}

回答by Maulik Kundaliya

You can use following code to set font of pickerview..

您可以使用以下代码来设置pickerview的字体..

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
    UILabel *tView = (UILabel *)view;
    if (!tView){
        tView = [[UILabel alloc] init];
        [tView setFont:[UIFont .....]];//set font 
            // Setup label properties - frame, font, colors etc
            ...
    }
    // Fill the label text here
    ...
    return tView;
}

回答by Scott Zhu

Thanks for @Richard Bown

感谢@Richard Bown

Would this be a better answer for Swift?

这对 Swift 来说是一个更好的答案吗？

func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView?) -> UIView {
        if let titleLabel = view as? UILabel {
            titleLabel.text = "Your Text"
            return titleLabel
        } else {
            let titleLabel = UILabel()
            titleLabel.font = UIFont.boldSystemFontOfSize(16)//Font you want here
            titleLabel.textAlignment = NSTextAlignment.Center
            titleLabel.text = "Your Text"
            return titleLabel
        }
    }

回答by Mark Bourke

let textLabel = view as? UILabel ?? {
    let label = UILabel()
    label.font = UIFont.boldSystemFontOfSize(16)
    label.textAlignment = .Center
    return label
}()
textLabel.text = Array(componentDataSources[component].keys)[row]
return textLabel

回答by zbMax

I think you have to add NSFontAttributeNamein your list of attributesand you could use the class method fontWithName:size:of UIFont

我认为你必须添加NSFontAttributeName在你的列表attributes，你可以使用类方法fontWithName:size:的UIFont