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
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))
}
}
其他回答
我已经尝试了Swift 4.2，希望它对你有用!
@IBDesignable class PaddingLabel: UILabel {
@IBInspectable var topInset: CGFloat = 5.0
@IBInspectable var bottomInset: CGFloat = 5.0
@IBInspectable var leftInset: CGFloat = 7.0
@IBInspectable var rightInset: CGFloat = 7.0
override func drawText(in rect: CGRect) {
let insets = UIEdgeInsets(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset)
super.drawText(in: rect.inset(by: insets))
}
override var intrinsicContentSize: CGSize {
let size = super.intrinsicContentSize
return CGSize(width: size.width + leftInset + rightInset,
height: size.height + topInset + bottomInset)
}
override var bounds: CGRect {
didSet {
// ensures this works within stack views if multi-line
preferredMaxLayoutWidth = bounds.width - (leftInset + rightInset)
}
}
}
或者你可以在这里使用CocoaPods https://github.com/levantAJ/PaddingLabel
吊舱' paddle标签'，'1.2'
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.
斯威夫特5
在layoutSubviews()方法上，更改UILabel的插入，如下所示。
override func layoutSubviews() {
super.layoutSubviews()
label.frame = label.frame.inset(by: UIEdgeInsets(top: 5, left: 10, bottom: 5, right: 10))
}
斯威夫特 4+
class EdgeInsetLabel: UILabel {
var textInsets = UIEdgeInsets.zero {
didSet { invalidateIntrinsicContentSize() }
}
override func textRect(forBounds bounds: CGRect, limitedToNumberOfLines numberOfLines: Int) -> CGRect {
let textRect = super.textRect(forBounds: bounds, limitedToNumberOfLines: numberOfLines)
let invertedInsets = UIEdgeInsets(top: -textInsets.top,
left: -textInsets.left,
bottom: -textInsets.bottom,
right: -textInsets.right)
return textRect.inset(by: invertedInsets)
}
override func drawText(in rect: CGRect) {
super.drawText(in: rect.inset(by: textInsets))
}
}
用法:
let label = EdgeInsetLabel()
label.textInsets = UIEdgeInsets(top: 2, left: 6, bottom: 2, right: 6)
