我有一个UILabel,我想在顶部和底部添加空格。在限制最小高度的情况下,我将其修改为:
为了做到这一点,我使用了:
override func drawTextInRect(rect: CGRect) {
var insets: UIEdgeInsets = UIEdgeInsets(top: 0.0, left: 10.0, bottom: 0.0, right: 10.0)
super.drawTextInRect(UIEdgeInsetsInsetRect(rect, insets))
}
但我必须找到不同的方法,因为如果我写了超过两行,问题是一样的:
如果在应用填充时遇到文本修剪问题,请使用此代码。
@IBDesignable class PaddingLabel: UILabel {
@IBInspectable var topInset: CGFloat = 5.0
@IBInspectable var bottomInset: CGFloat = 5.0
@IBInspectable var leftInset: CGFloat = 5.0
@IBInspectable var rightInset: CGFloat = 5.0
override func drawText(in rect: CGRect) {
let insets = UIEdgeInsets.init(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset)
super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
}
override var intrinsicContentSize: CGSize {
var intrinsicSuperViewContentSize = super.intrinsicContentSize
let textWidth = frame.size.width - (self.leftInset + self.rightInset)
let newSize = self.text!.boundingRect(with: CGSize(textWidth, CGFloat.greatestFiniteMagnitude), options: NSStringDrawingOptions.usesLineFragmentOrigin, attributes: [NSFontAttributeName: self.font], context: nil)
intrinsicSuperViewContentSize.height = ceil(newSize.size.height) + self.topInset + self.bottomInset
return intrinsicSuperViewContentSize
}
}
extension CGSize{
init(_ width:CGFloat,_ height:CGFloat) {
self.init(width:width,height:height)
}
}
Swift 3代码及其实现示例
class UIMarginLabel: UILabel {
var topInset: CGFloat = 0
var rightInset: CGFloat = 0
var bottomInset: CGFloat = 0
var leftInset: CGFloat = 0
override func drawText(in rect: CGRect) {
let insets: UIEdgeInsets = UIEdgeInsets(top: self.topInset, left: self.leftInset, bottom: self.bottomInset, right: self.rightInset)
self.setNeedsLayout()
return super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
}
}
class LabelVC: UIViewController {
//Outlets
@IBOutlet weak var labelWithMargin: UIMarginLabel!
override func viewDidLoad() {
super.viewDidLoad()
//Label settings.
labelWithMargin.leftInset = 10
view.layoutIfNeeded()
}
}
不要忘记在故事板标签对象中添加类名UIMarginLabel。
编码快乐!