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
一个实用的解决方案是添加与主标签高度和颜色相同的空白标签。将主标签的前导/尾距设置为零，对齐垂直中心，并设置所需的宽度。
其他回答
我在任何地方都没有看到这个答案。我的技巧是在标签上设置宽度限制，并在设置标签文本时调整宽度。
self.myLabel.text = myString;
UIFont * const font = [UIFont systemFontOfSize:17 weight:UIFontWeightRegular]; // Change to your own label font.
CGSize const size = CGSizeMake(INFINITY, 18); // 18 is height of label.
CGFloat const textWidth = [myString boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName: font} context:nil].size.width;
self.myLabelWidthConstraint.constant = textWidth + 20; // 10 padding on each side. Also, set text alignment to centre.
简单的填充:
import UIKit
class NewLabel: UILabel {
override func textRectForBounds(bounds: CGRect, limitedToNumberOfLines numberOfLines: Int) -> CGRect {
return CGRectInset(self.bounds, CGFloat(15.0), CGFloat(15.0))
}
override func drawRect(rect: CGRect) {
super.drawTextInRect(CGRectInset(self.bounds,CGFloat(5.0), CGFloat(5.0)))
}
}
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)
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))
}
}
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!
