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
这里有一个快速的解决方案。只需在文件底部添加这个自定义类(或为其创建一个新文件),并在创建标签时使用MyLabel而不是UILabel。
class MyLabel: UILabel{
override func drawTextInRect(rect: CGRect) {
super.drawTextInRect(UIEdgeInsetsInsetRect(rect, UIEdgeInsets(top: 0, left: 10, bottom: 0, right: 0)))
}
}
其他回答
我已经用xcode构建器解决了它(但肯定这可以通过swift使用约束来实现):
只需要创建一个相应大小的UIView 并添加一个UILabel类型的子视图
好了,你有填充了:)
很多答案都缺少对sizeThatFits的重写。有了这个子类,你可以创建标签,设置填充,然后输入label。sizetofit(),瞧。
import UIKit
class UILabelEx : UILabel
{
var padding : UIEdgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
override func drawTextInRect(rect: CGRect) {
super.drawTextInRect(UIEdgeInsetsInsetRect(rect, padding))
}
override func sizeThatFits(size: CGSize) -> CGSize
{
var adjSize = super.sizeThatFits(size)
adjSize.width += padding.left + padding.right
adjSize.height += padding.top + padding.bottom
return adjSize
}
}
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。
我通过子类化UILabel和重写drawTextInRect来解决这个问题:
- (void)drawTextInRect:(CGRect)rect {
UIEdgeInsets insets = {0, 5, 0, 5};
[super drawTextInRect:UIEdgeInsetsInsetRect(rect, insets)];
}
斯威夫特3.1:
override func drawText(in rect: CGRect) {
let insets = UIEdgeInsets.init(top: 0, left: 5, bottom: 0, right: 5)
super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
}
斯威夫特4.2.1:准备
override func drawText(in rect: CGRect) {
let insets = UIEdgeInsets(top: 0, left: 5, bottom: 0, right: 5)
super.drawText(in: rect.inset(by: insets))
}
你可能已经猜到了,这是对tc的改编。的答案。它有两个优点:
没有必要通过发送sizeToFit消息来触发它 它只保留标签框架——如果你的标签有背景,而你不想让它缩小,这很方便
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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