我想设置一个UILabel的左插图/边距，但找不到这样做的方法。标签有一个背景集，所以仅仅改变它的原点是行不通的。这将是理想的插入文本10px左右在左手边。
当前回答
如果是单行，只需在左侧添加空格，超过一行的填充将再次为0。
[self.myLabel setText:[NSString stringWithFormat:@" %@", self.myShortString]];
其他回答
和@IBDesignable，使其与接口生成器一起工作
斯威夫特4
//
// PaddedLabel.swift
// TrainCentric
//
// Created by Arsonik
// https://stackoverflow.com/a/33244365/337934
//
import UIKit
@IBDesignable
class PaddedLabel: UILabel {
@IBInspectable var inset:CGSize = CGSize(width: 0, height: 0)
var padding: UIEdgeInsets {
var hasText:Bool = false
if let t = self.text?.count, t > 0 {
hasText = true
}
else if let t = attributedText?.length, t > 0 {
hasText = true
}
return hasText ? UIEdgeInsets(top: inset.height, left: inset.width, bottom: inset.height, right: inset.width) : UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
}
override func drawText(in rect: CGRect) {
super.drawText(in: rect.inset(by: padding))
}
override var intrinsicContentSize: CGSize {
let superContentSize = super.intrinsicContentSize
let p = padding
let width = superContentSize.width + p.left + p.right
let heigth = superContentSize.height + p.top + p.bottom
return CGSize(width: width, height: heigth)
}
override func sizeThatFits(_ size: CGSize) -> CGSize {
let superSizeThatFits = super.sizeThatFits(size)
let p = padding
let width = superSizeThatFits.width + p.left + p.right
let heigth = superSizeThatFits.height + p.top + p.bottom
return CGSize(width: width, height: heigth)
}
}
斯威夫特2
@IBDesignable
class PaddedLabel: UILabel {
@IBInspectable var inset:CGSize = CGSize(width: 0, height: 0)
var padding: UIEdgeInsets {
var hasText:Bool = false
if let t = text?.length where t > 0 {
hasText = true
}
else if let t = attributedText?.length where t > 0 {
hasText = true
}
return hasText ? UIEdgeInsets(top: inset.height, left: inset.width, bottom: inset.height, right: inset.width) : UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
}
override func drawTextInRect(rect: CGRect) {
super.drawTextInRect(UIEdgeInsetsInsetRect(rect, padding))
}
override func intrinsicContentSize() -> CGSize {
let superContentSize = super.intrinsicContentSize()
let p = padding
let width = superContentSize.width + p.left + p.right
let heigth = superContentSize.height + p.top + p.bottom
return CGSize(width: width, height: heigth)
}
override func sizeThatFits(size: CGSize) -> CGSize {
let superSizeThatFits = super.sizeThatFits(size)
let p = padding
let width = superSizeThatFits.width + p.left + p.right
let heigth = superSizeThatFits.height + p.top + p.bottom
return CGSize(width: width, height: heigth)
}
}
对于这样一个简单的情况，子类化有点麻烦。另一种方法是将没有背景设置的UILabel添加到有背景设置的UIView中。将标签的x设置为10，并使外部视图的大小比标签宽20个像素。
如果你不想使用一个额外的父视图来设置背景，你可以子类化UILabel并重写textRectForBounds: limitedtonumberolines:。我会添加一个textEdgeInsets属性或类似的，然后做
- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines
{
return [super textRectForBounds:UIEdgeInsetsInsetRect(bounds,textEdgeInsets) limitedToNumberOfLines:numberOfLines];
}
为了健壮性，你可能还想在setTextEdgeInsets:中调用[self setNeedsDisplay]，但我通常不这么做。
对于Xamarin用户(使用统一API):
class UIMarginLabel : UILabel
{
public UIMarginLabel()
{
}
public UIMarginLabel( CGRect frame ) : base( frame )
{
}
public UIEdgeInsets Insets { get; set; }
public override void DrawText( CGRect rect )
{
base.DrawText( Insets.InsetRect( rect ) );
}
}
对于那些使用原始MonoTouch API的人:
public class UIMarginLabel : UILabel
{
public UIEdgeInsets Insets { get; set; }
public UIMarginLabel() : base()
{
Insets = new UIEdgeInsets(0, 0, 0, 0);
}
public UIMarginLabel(RectangleF frame) : base(frame)
{
Insets = new UIEdgeInsets(0, 0, 0, 0);
}
public override void DrawText(RectangleF frame)
{
base.DrawText(new RectangleF(
frame.X + Insets.Left,
frame.Y + Insets.Top,
frame.Width - Insets.Left - Insets.Right,
frame.Height - Insets.Top - Insets.Bottom));
}
}
回收钢铁的答案的Swift版本+ intrinsizeContentSize()。
它支持一个更传统的设置insets为其他视图对象的insets，同时能够设置insets在接口生成器，即insets设置像这样编程:
label.insets = UIEdgeInsetsMake(0, 0, 5, 0)
如果有任何错误，请告诉我。
斯威夫特5
@IBInspectable var topInset: CGFloat = 0.0
@IBInspectable var leftInset: CGFloat = 0.0
@IBInspectable var bottomInset: CGFloat = 0.0
@IBInspectable var rightInset: CGFloat = 0.0
var insets: UIEdgeInsets {
get {
return UIEdgeInsets(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset)
}
set {
topInset = newValue.top
leftInset = newValue.left
bottomInset = newValue.bottom
rightInset = newValue.right
}
}
override func drawText(in rect: CGRect) {
super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
}
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 {
var contentSize = super.intrinsicContentSize
contentSize.width += leftInset + rightInset
contentSize.height += topInset + bottomInset
return contentSize
}
斯威夫特4.2
@IBDesignable class InsetLabel: UILabel {
@IBInspectable var topInset: CGFloat = 0.0
@IBInspectable var leftInset: CGFloat = 0.0
@IBInspectable var bottomInset: CGFloat = 0.0
@IBInspectable var rightInset: CGFloat = 0.0
var insets: UIEdgeInsets {
get {
return UIEdgeInsetsMake(topInset, leftInset, bottomInset, rightInset)
}
set {
topInset = newValue.top
leftInset = newValue.left
bottomInset = newValue.bottom
rightInset = newValue.right
}
}
override func drawText(in rect: CGRect) {
super.drawText(in: rect.inset(by: insets))
}
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 {
var contentSize = super.intrinsicContentSize
contentSize.width += leftInset + rightInset
contentSize.height += topInset + bottomInset
return contentSize
}
}
斯威夫特3
@IBDesignable class InsetLabel: UILabel {
@IBInspectable var topInset: CGFloat = 0.0
@IBInspectable var leftInset: CGFloat = 0.0
@IBInspectable var bottomInset: CGFloat = 0.0
@IBInspectable var rightInset: CGFloat = 0.0
var insets: UIEdgeInsets {
get {
return UIEdgeInsetsMake(topInset, leftInset, bottomInset, rightInset)
}
set {
topInset = newValue.top
leftInset = newValue.left
bottomInset = newValue.bottom
rightInset = newValue.right
}
}
override func drawText(in rect: CGRect) {
super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
}
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 {
var contentSize = super.intrinsicContentSize
contentSize.width += leftInset + rightInset
contentSize.height += topInset + bottomInset
return contentSize
}
}
斯威夫特2.2
@IBDesignable class InsetLabel: UILabel {
@IBInspectable var topInset: CGFloat = 0.0
@IBInspectable var leftInset: CGFloat = 0.0
@IBInspectable var bottomInset: CGFloat = 0.0
@IBInspectable var rightInset: CGFloat = 0.0
var insets: UIEdgeInsets {
get {
return UIEdgeInsetsMake(topInset, leftInset, bottomInset, rightInset)
}
set {
topInset = newValue.top
leftInset = newValue.left
bottomInset = newValue.bottom
rightInset = newValue.right
}
}
override func drawTextInRect(rect: CGRect) {
super.drawTextInRect(UIEdgeInsetsInsetRect(rect, insets))
}
override func sizeThatFits(size: CGSize) -> CGSize {
var adjSize = super.sizeThatFits(size)
adjSize.width += leftInset + rightInset
adjSize.height += topInset + bottomInset
return adjSize
}
override func intrinsicContentSize() -> CGSize {
var contentSize = super.intrinsicContentSize()
contentSize.width += leftInset + rightInset
contentSize.height += topInset + bottomInset
return contentSize
}
}
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