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label.font = UIFont.preferredFontForTextStyle(UIFontTextStyleBody)

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[[NSNotificationCenter defaultCenter] addObserver:self 
        selector:@selector(didReceiveUIContentSizeCategoryDidChangeNotification:)
        name:UIContentSizeCategoryDidChangeNotification object:nil];

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- (void)didReceiveUIContentSizeCategoryDidChangeNotification:(NSNotification *)notification
  {
    label.font = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
  }

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NSNotificationCenter.defaultCenter().addObserver(self,
                        selector: "didReceiveUIContentSizeCategoryDidChangeNotification:", 
                        name: UIContentSizeCategoryDidChangeNotification, object: nil)

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func didReceiveUIContentSizeCategoryDidChangeNotification(notification: NSNotification)
  {
    label.font = UIFont.preferredFontForTextStyle(UIFontTextStyleBody)
  }

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UIFontDescriptor *descriptorFontBody = [UIFontDescriptor preferredFontDescriptorWithTextStyle:UIFontTextStyleHeadline];
  CGFloat descriptorFontBodySize = [userHeadLineFont pointSize];
  UIFont *bodyFont = [UIFont fontWithName:@"Zapfino" size:descriptorFontBodySize];
  label.font = bodyFont;

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let descriptorFontBody = UIFontDescriptor.preferredFontDescriptorWithTextStyle(UIFontTextStyleBody)
  let descriptionFontBodySize = descriptorFontBody.pointSize;
  let bodyFont = UIFont(name: "Zapfino", size: descriptionFontBodySize)
  label.font = bodyFont;

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import UIKit

class RoundedButton: UIButton {

    // Only override drawRect: if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    override func drawRect(rect: CGRect) {
        let maskPath = UIBezierPath.init(roundedRect: self.bounds, cornerRadius: 5)
        UIColor.clearColor().setFill()
        maskPath.fill()

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import UIKit

extension UIButton {


    private func actionHandleBlock(action:(() -> Void)? = nil) {
        struct __ {
            static var action :(() -> Void)?
        }
        if action != nil {

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NSMutableArray *commands = [[NSMutableArray alloc] init];
    NSString *characters = @"`1234567890-=qwertyuiop[]asdfghjkl;'zxcvbnm,./";
    for (NSInteger i = 0; i < characters.length; i++) {
        NSString *input = [characters substringWithRange:NSMakeRange(i, 1)];
        
        /* Caps Lock */
        [commands addObject:[UIKeyCommand keyCommandWithInput:input modifierFlags:UIKeyModifierAlphaShift action:@selector(handleCommand:)]];
        /* Shift */
        [commands addObject:[UIKeyCommand keyCommandWithInput:input modifierFlags:UIKeyModifierShift action:@selector(handleCommand:)]];
        /* Control */