Ändern Schriftart und seine Größe eines Picker in schnellen

Question

mit Objective-C, habe ich den Code unten Schriftfamilie einstellen/ändern und die Größe eines Picker:

- (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 
    tView.font = [UIFont fontWithName:@"Times New Roman" size:fontsize];; 
} 
tView.text = [_mysitedata findKeyForRow:row]; 
NSLog(@"C key:%@ row:%ld comp:%ld", tView.text, (long int)row, (long int)component); 
return tView; 
} 

Allerdings ist Swift kein akzeptieren Guss von UIView UILabel und daher kann ich diesen Weg nicht folgen, die so etwas wie unten gezeigt aussehen:

func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView?) -> UIView { 
    let label = view as! UILabel 
    label.font = UIFont(name: "Times New Roman", size: 1.0) 
    label.text = pickerData[row] 
    return label 
} 

der erste abgetan (let Etikett ....) throuws eine Ausnahme zur Laufzeit:

EXC-BAD BETRIEBS (code = EXC_I386_INVOP, Subcode = 0x0)

Answer 1

Eine idiomatische Swift Codierung wäre:

func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView?) -> UIView { 
    guard let label = view as? UILabel else { 
    preconditionFailure ("Expected a Label") 
    } 

    label.font = UIFont(name: "Times New Roman", size: 1.0) 
    label.text = pickerData[row] 
    return label 
} 

Answer 2

den Namen der Schriftart ändern und Größe können Sie viewForRow und eine zugeschrieben verwenden string:

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

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

    var data = pickerData[row] 
    let title = NSAttributedString(string: data!, attributes: [NSFontAttributeName: UIFont.systemFontOfSize(36.0, weight: UIFontWeightRegular)]) 
    label.attributedText = title 
    label.textAlignment = .Center 
    return label 

} 

Und wenn Sie Ihre Schriftgröße größer Sie machen werden die Höhe jeder Zeile mit rowHeightForComponent zu erhöhen:

func pickerView(pickerView: UIPickerView, rowHeightForComponent component: Int) -> CGFloat { 
    return 36.0 
} 

Answer 3

Für Swift 3

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

    label.textColor = .black 
    label.textAlignment = .center 
    label.font = UIFont(name: "SanFranciscoText-Light", size: 18) 

    // where data is an Array of String 
    label.text = pickerData[row] 

    return label 
    } 

Answer 4

Für schnellen 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 = UIFont(name: "Lato-Regular", size: 17)! 
     label.text = dataArray[row] as? String 
     label.textAlignment = .Center 
     return label 

    } 

Für Swift 3

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

     print("Returning Custom label") 
     var label = view as! UILabel! 
     if label == nil { 
      label = UILabel() 
     } 

     label?.font = UIFont(name: "Lato-Regular", size: 14)! 
     label?.text = dataArray[row] as? String 
     label?.textAlignment = .center 
     return label! 

    } 

Answer 5

Wenn Sie t wollen er Picker Label AutoShrink ...

Set adjustsFontSizeToFitWidth=true und 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 = "..." 
    label.textAlignment = .center 
    label.font = UIFont.boldSystemFont(ofSize: 20) 
    label.adjustsFontSizeToFitWidth = true 
    label.minimumScaleFactor = 0.5 

    return label 
}