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
严格适用于单行标签:(2021语法)
对于任何谷歌这里谁需要在严格单行标签填充(如节标题或其他列表项)，
语法发生了很大变化。当心互联网上的过时信息。
下面是要复制和粘贴的确切类:
// add 100 above, 50 padding below a SINGLE-LINE label
import UIKit
class SingleLineLabelWithSpacing: UILabel {
// STRICTLY for SINGLE LINE labels
// only works with SINGLE LINE labels
override func drawText(in rect: CGRect) {
let insets: UIEdgeInsets = UIEdgeInsets(
top: 100, left: 0, bottom: 50, right: 0)
super.drawText(in: rect.inset(by: insets))
}
override var intrinsicContentSize: CGSize {
var ic = super.intrinsicContentSize
ic.height = ic.height + 150
return ic
}
}
在这个例子中，填充大于或小于100/50。
当您有任何类型的滚动列表、提要或其他列表时，这是通常要做的事情。
这样你就不必考虑标题上方/下方的空格，用户名等等——你只需要把它放到堆栈视图或其他任何情况下。
当然，当设计师想要调整时，你也可以在任何地方同时更改这两个值。
提醒:如果你想真正填充一个UILabel，让它无论文本行数、动态大小单元格、动画等等都能完美工作，这是非常复杂的。唯一正确的答案是:https://stackoverflow.com/a/58876988/294884
其他回答
简单的方法
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.view.addSubview(makeLabel("my title",x: 0, y: 100, w: 320, h: 30))
}
func makeLabel(title:String, x:CGFloat, y:CGFloat, w:CGFloat, h:CGFloat)->UILabel{
var myLabel : UILabel = UILabel(frame: CGRectMake(x,y,w,h))
myLabel.textAlignment = NSTextAlignment.Right
// inser last char to right
var titlePlus1char = "\(title)1"
myLabel.text = titlePlus1char
var titleSize:Int = count(titlePlus1char)-1
myLabel.textColor = UIColor(red:1.0, green:1.0,blue:1.0,alpha:1.0)
myLabel.backgroundColor = UIColor(red: 214/255, green: 167/255, blue: 0/255,alpha:1.0)
// create myMutable String
var myMutableString = NSMutableAttributedString()
// create myMutable font
myMutableString = NSMutableAttributedString(string: titlePlus1char, attributes: [NSFontAttributeName:UIFont(name: "HelveticaNeue", size: 20)!])
// set margin size
myMutableString.addAttribute(NSFontAttributeName, value: UIFont(name: "HelveticaNeue", size: 10)!, range: NSRange(location: titleSize,length: 1))
// set last char to alpha 0
myMutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor(red:1.0, green:1.0,blue:1.0,alpha:0), range: NSRange(location: titleSize,length: 1))
myLabel.attributedText = myMutableString
return myLabel
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
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!
在Swift 3中
最好最简单的方法
class UILabelPadded: UILabel {
override func drawText(in rect: CGRect) {
let insets = UIEdgeInsets.init(top: 0, left: 5, bottom: 0, right: 5)
super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
}
}
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.
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)
