添加空格/填充到UILabel
我有一个UILabel ，我想在顶部和底部添加空间。 在最小限度的高度我已经修改它：
编辑：要做到这一点，我用过：
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)) }
但是我要find一个不同的方法，因为如果我写两行以上的话，问题是一样的：
如果你想坚持使用UILabel，而不需要inheritance它，蒙迪给了你一个明确的解决scheme。
如果你愿意避免用UIView包装UILabel，你可以使用UITextView来使用UIEdgeInsets（padding）或UILabel的子类来支持UIEdgeInsets。
使用UITextView只需要提供插入（OBJ-C）：
textView.textContainerInset = UIEdgeInsetsMake(10, 0, 10, 0);
另外，如果你inheritanceUILabel ，这个方法的一个例子就是覆盖drawTextInRect方法
（OBJ-C）
- (void)drawTextInRect:(CGRect)uiLabelRect { UIEdgeInsets myLabelInsets = {10, 0, 10, 0}; [super drawTextInRect:UIEdgeInsetsInsetRect(uiLabelRect, myLabelInsets)]; }
您还可以为TOP，LEFT，BOTTOM和RIGHT提供新的子类UILabel。
示例代码可以是：
在.h（OBJ-C）
float topInset, leftInset,bottomInset, rightInset;
在.m（OBJ-C）
- (void)drawTextInRect:(CGRect)uiLabelRect { [super drawTextInRect:UIEdgeInsetsInsetRect(uiLabelRect, UIEdgeInsetsMake(topInset,leftInset,bottomInset,rightInset))]; }
编辑＃1：
从我所看到的，似乎你必须覆盖UILabel的子类化时的intrinsicContentSize。
所以你应该重写intrinsicContentSize ：
- (CGSize) intrinsicContentSize { CGSize intrinsicSuperViewContentSize = [super intrinsicContentSize] ; intrinsicSuperViewContentSize.height += topInset + bottomInset ; intrinsicSuperViewContentSize.width += leftInset + rightInset ; return intrinsicSuperViewContentSize ; }
并添加下面的方法来编辑你的插入，而不是单独编辑它们：
- (void) setContentEdgeInsets:(UIEdgeInsets)edgeInsets { topInset = edgeInsets.top; leftInset = edgeInsets.left; rightInset = edgeInsets.right; bottomInset = edgeInsets.bottom; [self invalidateIntrinsicContentSize] ; }
它会更新你的UILabel的大小来匹配边缘插槽，并覆盖你所提到的多行的必要性。
编辑＃2
search了一下之后，我发现了这个Gist与IPInsetLabel。 如果这些解决scheme都不起作用，您可以尝试一下。
编辑＃3
关于这个事情有类似的问题（重复）。
有关可用解决scheme的完整列表，请参阅此答案： UILabel文本边距
你可以从IB正确地做到这一点：
- 将文本更改为归因
- 用“…”去下拉列表
- 你会看到一些填充属性的行，段落和文本更改缩进第一行或任何你想要的
- 检查结果
Swift 3
import UIKit 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(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset) super.drawText(in: UIEdgeInsetsInsetRect(rect, insets)) } override var intrinsicContentSize: CGSize { get { var contentSize = super.intrinsicContentSize contentSize.height += topInset + bottomInset contentSize.width += leftInset + rightInset return contentSize } } }
我已经试过了，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 drawTextInRect(rect: CGRect) { let insets = UIEdgeInsets(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset) super.drawTextInRect(UIEdgeInsetsInsetRect(rect, insets)) } override func intrinsicContentSize() -> CGSize { var intrinsicSuperViewContentSize = super.intrinsicContentSize() intrinsicSuperViewContentSize.height += topInset + bottomInset intrinsicSuperViewContentSize.width += leftInset + rightInset return intrinsicSuperViewContentSize } }
只需使用UIView作为超级视图，并使用自动布局为标签定义固定边距。
SWIFT 3
易于使用的解决scheme，适用于项目中的所有UILabel子项目。
例：
let label = UILabel() label.<Do something> label.padding = UIEdgeInsets(top: 0, left: 16, bottom: 0, right: 0)
UILabel扩展
import UIKit extension UILabel { private struct AssociatedKeys { static var padding = UIEdgeInsets() } public var padding: UIEdgeInsets? { get { return objc_getAssociatedObject(self, &AssociatedKeys.padding) as? UIEdgeInsets } set { if let newValue = newValue { objc_setAssociatedObject(self, &AssociatedKeys.padding, newValue as UIEdgeInsets!, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC) } } } override open func draw(_ rect: CGRect) { if let insets = padding { self.drawText(in: UIEdgeInsetsInsetRect(rect, insets)) } else { self.drawText(in: rect) } } override open var intrinsicContentSize: CGSize { guard let text = self.text else { return super.intrinsicContentSize } var contentSize = super.intrinsicContentSize var textWidth: CGFloat = frame.size.width var insetsHeight: CGFloat = 0.0 if let insets = padding { textWidth -= insets.left + insets.right insetsHeight += insets.top + insets.bottom } let newSize = text.boundingRect(with: CGSize(width: textWidth, height: CGFloat.greatestFiniteMagnitude), options: NSStringDrawingOptions.usesLineFragmentOrigin, attributes: [NSAttributedStringKey.font: self.font], context: nil) contentSize.height = ceil(newSize.size.height) + insetsHeight return contentSize } }
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称UIMarginLabel。 快乐编码！
子类UILabel。 （File-New-File-CocoaTouchClass -UMLabel的子类）。
// sampleLabel.swift import UIKit class sampleLabel: UILabel { let topInset = CGFloat(5.0), bottomInset = CGFloat(5.0), leftInset = CGFloat(8.0), rightInset = CGFloat(8.0) override func drawTextInRect(rect: CGRect) { let insets: UIEdgeInsets = UIEdgeInsets(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset) super.drawTextInRect(UIEdgeInsetsInsetRect(rect, insets)) } override func intrinsicContentSize() -> CGSize { var intrinsicSuperViewContentSize = super.intrinsicContentSize() intrinsicSuperViewContentSize.height += topInset + bottomInset intrinsicSuperViewContentSize.width += leftInset + rightInset return intrinsicSuperViewContentSize } }
在ViewController上：
override func viewDidLoad() { super.viewDidLoad() let labelName = sampleLabel(frame: CGRectMake(0, 100, 300, 25)) labelName.text = "Sample Label" labelName.backgroundColor = UIColor.grayColor() labelName.textColor = UIColor.redColor() labelName.shadowColor = UIColor.blackColor() labelName.font = UIFont(name: "HelveticaNeue", size: CGFloat(22)) self.view.addSubview(labelName) }
或者将Storyboard上的自定义UILabel类作为Label的类关联。
Swift 3，iOS10解决scheme：
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)) } }
只需使用已经内置的UIButton。closures所有额外的buttonfunction，并且您有一个可以设置边缘的标签。
let button = UIButton() button.contentEdgeInsets = UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5) button.setTitle("title", for: .normal) button.tintColor = .white // this will be the textColor button.isUserInteractionEnabled = false
我在接受的答案中编了一点。 leftInset和rightInset增加时会出现问题，部分文字会消失，b / c标签的宽度会变窄但高度不会增加如图：
要解决这个问题，你需要重新计算文本的高度如下：
@IBDesignable class PaddingLabel: UILabel { @IBInspectable var topInset: CGFloat = 20.0 @IBInspectable var bottomInset: CGFloat = 20.0 @IBInspectable var leftInset: CGFloat = 20.0 @IBInspectable var rightInset: CGFloat = 20.0 override func drawTextInRect(rect: CGRect) { let insets = UIEdgeInsets(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset) super.drawTextInRect(UIEdgeInsetsInsetRect(rect, insets)) } override func intrinsicContentSize() -> CGSize { var intrinsicSuperViewContentSize = super.intrinsicContentSize() let textWidth = frame.size.width - (self.leftInset + self.rightInset) let newSize = self.text!.boundingRectWithSize(CGSizeMake(textWidth, CGFloat.max), options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: [NSFontAttributeName: self.font], context: nil) intrinsicSuperViewContentSize.height = ceil(newSize.size.height) + self.topInset + self.bottomInset return intrinsicSuperViewContentSize } }
结果是：
我希望帮助一些和我一样的人。
易填充（Swift 3.0，Alvin George答案）：
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))) } }
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. } }
在Swift 3
最好和简单的方法
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)) } }
没有故事板：
class PaddingLabel: UILabel { var topInset: CGFloat var bottomInset: CGFloat var leftInset: CGFloat var rightInset: CGFloat required init(withInsets top: CGFloat, _ bottom: CGFloat,_ left: CGFloat,_ right: CGFloat) { self.topInset = top self.bottomInset = bottom self.leftInset = left self.rightInset = right super.init(frame: CGRect.zero) } required init?(coder aDecoder: NSCoder) { fatalError("init(coder:) has not been implemented") } override func drawText(in rect: CGRect) { let insets = UIEdgeInsets(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset) super.drawText(in: UIEdgeInsetsInsetRect(rect, insets)) } override var intrinsicContentSize: CGSize { get { var contentSize = super.intrinsicContentSize contentSize.height += topInset + bottomInset contentSize.width += leftInset + rightInset return contentSize } } }
用法：
let label = PaddingLabel(8, 8, 16, 16) label.font = .boldSystemFont(ofSize: 16) label.text = "Hello World" label.backgroundColor = .black label.textColor = .white label.textAlignment = .center label.layer.cornerRadius = 8 label.clipsToBounds = true label.sizeToFit() view.addSubview(label)
结果：
易填充：
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))) } }
类似于其他的答案，但用一个func类来设置填充dinamically：
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)) } }
一个实用的解决scheme是添加与主标签具有相同高度和颜色的空白标签。 将主标签的开头/结尾空格设置为零，alignment垂直中心，并将宽度设置为所需的边距。
没有子类化的另一种select是：
- 设置标签
text -
sizeToFit() -
然后稍微增加标签高度以模拟填充
label.text = "someText" label.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)
如果你想在textRect周围添加2px的填充，只需要这样做：
let insets = UIEdgeInsets(top: -2, left: -2, bottom: -2, right: -2) label.frame = UIEdgeInsetsInsetRect(textRect, insets)
蒙迪的答案的详细说明。
即在UIViewembedded标签并通过自动布局实施填充。 例：
概述：
1）创build一个UIView （“面板”），并设置其外观。
2）创build一个UILabel并将其添加到面板。
3）添加约束来强制填充。
4）将面板添加到您的视图层次结构，然后定位面板。
细节：
1）创build面板视图。
let panel = UIView() panel.backgroundColor = .green panel.layer.cornerRadius = 12
2）创build标签，将其作为子视图添加到面板。
let label = UILabel() panel.addSubview(label)
3）在标签的边缘和面板之间添加约束。 这迫使面板与标签保持一定的距离。 即“填充”
编辑：所有这些手工操作都非常繁琐，冗长而且容易出错。 我build议你从github中select一个Auto Layout包装器，或者自己写一个
label.panel.translatesAutoresizingMaskIntoConstraints = false label.topAnchor.constraint(equalTo: panel.topAnchor, constant: vPadding).isActive = true label.bottomAnchor.constraint(equalTo: panel.bottomAnchor, constant: -vPadding).isActive = true label.leadingAnchor.constraint(equalTo: panel.leadingAnchor, constant: hPadding).isActive = true label.trailingAnchor.constraint(equalTo: panel.trailingAnchor, constant: -hPadding).isActive = true label.textAlignment = .center
4）将面板添加到您的视图层次，然后添加定位约束。 例如拥抱tableViewCell的右侧，如示例图像。
注意：您只需要添加位置约束，而不是维度约束：自动布局将根据标签的intrinsicContentSize和之前添加的约束来解决布局。
hostView.addSubview(panel) panel.translatesAutoresizingMaskIntoConstraints = false panel.trailingAnchor.constraint(equalTo: hostView.trailingAnchor, constant: -16).isActive = true panel.centerYAnchor.constraint(equalTo: hostView.centerYAnchor).isActive = true
只需使用自动布局：
let paddedWidth = myLabel.intrinsicContentSize.width + 2 * padding myLabel.widthAnchor.constraint(equalToConstant: paddedWidth).isActive = true
完成。
