如何在UIPickerView中更改字体大小？

Question

我有一个UIPickerView。这有近200个项目，每个项目都有长文本，因此，我想调整UIPickerView的字体大小。我怎么能改变它？有可能的？ 谁能帮我？谢谢！

Yuva.M

Answer 1

您需要在选择器委托中实施pickerView:viewForRow:forComponent:reusingView:方法

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

Answer 2

在Swift for iOS8中更新，您可以将其添加到您的代理：

org.springframework.security.web.authentication.AuthenticationFailureHandler

Answer 3

用于UIPickerView Rows的字体调整

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
    UILabel* pickerLabel = (UILabel*)view;

    if (!pickerLabel)
    {
        pickerLabel = [[UILabel alloc] init];

        pickerLabel.font = [UIFont fontWithName:@"SourceSansPro-Semibold"                size:16];

        pickerLabel.textAlignment=NSTextAlignmentCenter;
    }
    [pickerLabel setText:[self.data objectAtIndex:row]];

    return pickerLabel;
}

Answer 4

试试这个，它应该有所帮助：

  - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view{
UILabel* tView = (UILabel*)view;
if (!tView){
tView = [[UILabel alloc] init];
// Setup label properties - frame, font, colors etc
...
//adjustsFontSizeToFitWidth property to YES
tView.minimumFontSize = 8.;
tView.adjustsFontSizeToFitWidth = YES;
}
// Fill the label text here
...
return tView;
}


// altro modo completo sembrerebbe...
- (UIView *)pickerView:(UIPickerView *)pickerView
viewForRow:(NSInteger)row
forComponent:(NSInteger)component
reusingView:(UIView *)view {

UILabel *pickerLabel = (UILabel *)view;

if (pickerLabel == nil) {
CGRect frame = CGRectMake(0.0, 0.0, 80, 32);
pickerLabel = [[[UILabel alloc] initWithFrame:frame] autorelease];
[pickerLabel setTextAlignment:UITextAlignmentLeft];
[pickerLabel setBackgroundColor:[UIColor clearColor]];
[pickerLabel setFont:[UIFont boldSystemFontOfSize:15]];
}

[pickerLabel setText:[pickerDataArray objectAtIndex:row]];

return pickerLabel;

}

Answer 5

Swift 4： 更新@Alessandro Ornano回答并避免Force_cast违规错误：

func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
    var label = UILabel()
    if let v = view as? UILabel { label = v }
    label.font = UIFont (name: "Helvetica Neue", size: 10)
    label.text =  dataArray[row]
    label.textAlignment = .center
    return label
}

Answer 6

斯威夫特3 | 自动收缩

设置adjustsFontSizeToFitWidth=true和minimumScaleFactor=0.5

func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {

    var label: UILabel
    if let view = view as? UILabel { label = view }
    else { label = UILabel() }

    label.text = "My Picker Text"
    label.textAlignment = .center
    label.font = UIFont.boldSystemFont(ofSize: 20)
    label.adjustsFontSizeToFitWidth = true
    label.minimumScaleFactor = 0.5

    return label
}

Answer 7

目标c

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view{

    UILabel* pickerLabel = (UILabel*)view;
    if (!pickerLabel){
        pickerLabel = [[UILabel alloc] init];
        // Setup label properties - frame, font, colors etc
        [pickerLabel setFont:[UIFont fontWithName:LATO_REGULAR_FONT size:SIZE_SEMIBOLD_FONT]];
        pickerLabel.textColor = primaryTextColor;
        pickerLabel.textAlignment = NSTextAlignmentCenter;


    }
    // Fill the label text here
    pickerLabel.text = self.dataSourceArray[row];

    return pickerLabel;
}

适用于Swift 2.3

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

        var label = view as! UILabel!
        if label == nil {
            label = UILabel()
        }

        label.font = LATO_REGULAR_FONT_17
        label.text =  dataArray[row] as? String
        label.textAlignment = .Center
        return label

    }

Answer 8

Swift 4.x

func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
        var label = UILabel()
        if let v = view {
            label = v as! UILabel
        }
        label.font = UIFont (name: "Helvetica Neue", size: 10)
        label.text =  dataArray[row]
        label.textAlignment = .center
        return label
    }

Answer 9

要设置系统字体，需要做一些不同的操作，如下所示：

let pickerLabel = UILabel()
pickerLabel.font = UIFont.systemFont(ofSize: 20.0, weight: .medium)

您可以选择常规，粗体等任何重量

Answer 10

干净的Swift解决方案没有强制展开

func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
    let label = (view as? UILabel) ?? UILabel()
    
    // setup label
    
    return label
}

Answer 11

大多数答案提供了中心对齐标签的解决方案。我不得不将文本对齐到左侧，并面对事实文本已被截断的事实。向左增加边距为我解决了这个问题。解决方案适用于Swift 5。

    func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
        
        let pickerLabel: UILabel
        
        if let label = view as? UILabel {
            pickerLabel = label
        } else {
            pickerLabel = UILabel()
            // Customize text
            pickerLabel.font = pickerLabel.font.withSize(20)
            pickerLabel.textAlignment = .left
            pickerLabel.textColor = UIColor.secondaryLabel
            // Create a paragraph with custom style
            // We only need indents to prevent text from being cut off
            let paragraphStyle = NSMutableParagraphStyle()
            paragraphStyle.firstLineHeadIndent = 12 // May vary
            // Create a string and append style to it
            let attributedString = NSMutableAttributedString(string: subjects[row])
            attributedString.addAttribute(.paragraphStyle, value: paragraphStyle, range: NSRange(location: 0, length: attributedString.length))
            // Update label's text
            pickerLabel.attributedText = attributedString
        }
        
        return pickerLabel
    }