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:
当前回答
类似于其他答案，但使用func类来动态地设置填充:
class UILabelExtendedView: UILabel
{
var topInset: CGFloat = 4.0
var bottomInset: CGFloat = 4.0
var leftInset: CGFloat = 8.0
var rightInset: CGFloat = 8.0
override func drawText(in rect: CGRect)
{
let insets: UIEdgeInsets = UIEdgeInsets(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset)
super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
}
override public var intrinsicContentSize: CGSize
{
var contentSize = super.intrinsicContentSize
contentSize.height += topInset + bottomInset
contentSize.width += leftInset + rightInset
return contentSize
}
func setPadding(top: CGFloat, left: CGFloat, bottom: CGFloat, right: CGFloat){
self.topInset = top
self.bottomInset = bottom
self.leftInset = left
self.rightInset = right
let insets: UIEdgeInsets = UIEdgeInsets(top: top, left: left, bottom: bottom, right: right)
super.drawText(in: UIEdgeInsetsInsetRect(self.frame, insets))
}
}
其他回答
简单填充(Swift 3.0, Alvin George回答):
class NewLabel: UILabel {
override func textRect(forBounds bounds: CGRect, limitedToNumberOfLines numberOfLines: Int) -> CGRect {
return self.bounds.insetBy(dx: CGFloat(15.0), dy: CGFloat(15.0))
}
override func draw(_ rect: CGRect) {
super.drawText(in: self.bounds.insetBy(dx: CGFloat(5.0), dy: CGFloat(5.0)))
}
}
Swift 3、iOS10解决方案:
open class UIInsetLabel: UILabel {
open var insets : UIEdgeInsets = UIEdgeInsets() {
didSet {
super.invalidateIntrinsicContentSize()
}
}
open override var intrinsicContentSize: CGSize {
var size = super.intrinsicContentSize
size.width += insets.left + insets.right
size.height += insets.top + insets.bottom
return size
}
override open func drawText(in rect: CGRect) {
return super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
}
}
就像其他答案一样，但它修复了一个bug:
当标签。宽度由自动布局控制，有时文本会被裁剪。
@IBDesignable
class InsetLabel: UILabel {
@IBInspectable var topInset: CGFloat = 4.0
@IBInspectable var leftInset: CGFloat = 4.0
@IBInspectable var bottomInset: CGFloat = 4.0
@IBInspectable var rightInset: CGFloat = 4.0
var insets: UIEdgeInsets {
get {
return UIEdgeInsets.init(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset)
}
set {
topInset = newValue.top
leftInset = newValue.left
bottomInset = newValue.bottom
rightInset = newValue.right
}
}
override func sizeThatFits(_ size: CGSize) -> CGSize {
var adjSize = super.sizeThatFits(size)
adjSize.width += leftInset + rightInset
adjSize.height += topInset + bottomInset
return adjSize
}
override var intrinsicContentSize: CGSize {
let systemContentSize = super.intrinsicContentSize
let adjustSize = CGSize(width: systemContentSize.width + leftInset + rightInset, height: systemContentSize.height + topInset + bottomInset)
if adjustSize.width > preferredMaxLayoutWidth && preferredMaxLayoutWidth != 0 {
let constraintSize = CGSize(width: bounds.width - (leftInset + rightInset), height: .greatestFiniteMagnitude)
let newSize = super.sizeThatFits(constraintSize)
return CGSize(width: systemContentSize.width, height: ceil(newSize.height) + topInset + bottomInset)
} else {
return adjustSize
}
}
override func drawText(in rect: CGRect) {
super.drawText(in: rect.inset(by: insets))
}
}
另一个没有子类化的选项是:
设置标签文本 sizeToFit () 然后稍微增加标签高度以模拟填充 标签。text = "someText" 标签。textAlignment = .center label.sizeToFit () label.frame = CGRect(x: label.frame.x, y: label.frame.y,width: label.frame.width + 20,height: label.frame.height + 8)
