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
Swift 4版的blyabtroi解决方案
let leadingMargin: CGFloat = 10
let trailingMargin: CGFloat = 10
let style = NSMutableParagraphStyle()
style.alignment = .justified
style.firstLineHeadIndent = leadingMargin
style.headIndent = leadingMargin
style.tailIndent = trailingMargin
label.attributedText = NSAttributedString(string: "Label with margins",
attributes: [NSAttributedStringKey.paragraphStyle: style])
其他回答
blyabtroi的asnwer在Swift中转换(不需要子类化)
let style: NSMutableParagraphStyle = NSParagraphStyle.defaultParagraphStyle().mutableCopy() as! NSMutableParagraphStyle
style.alignment = .Justified
style.firstLineHeadIndent = 10.0
style.headIndent = 10.0
style.tailIndent = -10.0
let attrText: NSAttributedString = NSAttributedString(string: title, attributes: [NSParagraphStyleAttributeName:style])
let label: UILabel = UILabel(frame: someFrame)
label.numberOfLines = 0
label.attributedText = attrText
在Swift中,它是这样解决的。
class Label: UILabel {
override func drawTextInRect(rect: CGRect) {
super.drawTextInRect(UIEdgeInsetsInsetRect(rect, UIEdgeInsets(top: 0, left: 10, bottom: 0, right: 10)))
}
}
Xcode 6.1.1 Swift扩展解决方案。
文件名可以是"UILabel+AddInsetMargin.swift":
import UIKit
extension UILabel
{
public override func drawRect(rect: CGRect)
{
self.drawTextInRect(UIEdgeInsetsInsetRect(rect, UIEdgeInsets(top: 0, left: 5, bottom: 0, right: 5)))
}
}
也许过会儿再去派对,但下面的就行了。只是UILabel的子类。
#import "UITagLabel.h"
#define padding UIEdgeInsetsMake(5, 10, 5, 10)
@implementation UITagLabel
- (void)drawTextInRect:(CGRect)rect {
[super drawTextInRect:UIEdgeInsetsInsetRect(rect, padding)];
}
- (CGSize) intrinsicContentSize {
CGSize superContentSize = [super intrinsicContentSize];
CGFloat width = superContentSize.width + padding.left + padding.right;
CGFloat height = superContentSize.height + padding.top + padding.bottom;
return CGSizeMake(width, height);
}
- (CGSize) sizeThatFits:(CGSize)size {
CGSize superSizeThatFits = [super sizeThatFits:size];
CGFloat width = superSizeThatFits.width + padding.left + padding.right;
CGFloat height = superSizeThatFits.height + padding.top + padding.bottom;
return CGSizeMake(width, height);
}
@end
这适用于多行标签:
class PaddedLabel: UILabel {
var verticalPadding: CGFloat = 0
var horizontalPadding: CGFloat = 0
override func drawText(in rect: CGRect) {
let insets = UIEdgeInsets(top: verticalPadding, left: horizontalPadding, bottom: verticalPadding, right: horizontalPadding)
super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
}
override var intrinsicContentSize: CGSize {
get {
let textWidth = super.intrinsicContentSize.width - horizontalPadding * 2
let textHeight = sizeThatFits(CGSize(width: textWidth, height: .greatestFiniteMagnitude)).height
let width = textWidth + horizontalPadding * 2
let height = textHeight + verticalPadding * 2
return CGSize(width: frame.width, height: height)
}
}
}
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