UILabel文字边距

本文翻译自：UILabel text margin

I'm looking to set the left inset/margin of a UILabel and can't find a method to do so. 我想设置UILabel的左边插入/边距，但找不到这样做的方法。 The label has a background set so just changing its origin won't do the trick. 标签有一个背景设置，所以只是改变它的起源不会有效。 It would be ideal to inset the text by 10px or so on the left hand side. 将文本插入左侧10px左右是理想的。

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#1楼

参考：https://stackoom.com/question/EaQw/UILabel文字边距

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#2楼

I ended up just adding some spaces to the text: 我最后只是在文本中添加了一些空格：

self.titleLabel.text = [NSString stringWithFormat:@"    %@", self.titleLabel.text];

Ugly yet effective, and no subclassing required. 丑陋但有效，不需要子类化。

You can try "\\t" as well. 你也可以尝试“\\ t”。 For a generic solution please refer to the accepted answer 对于通用解决方案，请参阅接受的答案

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#3楼

The best approach to add padding to a UILabel is to subclass UILabel and add an edgeInsets property. 向UILabel添加填充的最佳方法是继承UILabel并添加edgeInsets属性。 You then set the desired insets and the label will be drawn accordingly. 然后，您可以设置所需的插图，并相应地绘制标签。

OSLabel.h OSLabel.h

#import <UIKit/UIKit.h>

@interface OSLabel : UILabel

@property (nonatomic, assign) UIEdgeInsets edgeInsets;

@end

OSLabel.m OSLabel.m

#import "OSLabel.h"

@implementation OSLabel

- (id)initWithFrame:(CGRect)frame{
    self = [super initWithFrame:frame];
    if (self) {
        self.edgeInsets = UIEdgeInsetsMake(0, 0, 0, 0);
    }
    return self;
}

- (void)drawTextInRect:(CGRect)rect {
    [super drawTextInRect:UIEdgeInsetsInsetRect(rect, self.edgeInsets)];
}

- (CGSize)intrinsicContentSize
{
    CGSize size = [super intrinsicContentSize];
    size.width  += self.edgeInsets.left + self.edgeInsets.right;
    size.height += self.edgeInsets.top + self.edgeInsets.bottom;
    return size;
}

@end

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#4楼

You can also solve this by initializing your UILabel with a custom frame. 您也可以通过使用自定义框架初始化UILabel来解决此问题。

    CGRect initialFrame = CGRectMake(0, 0, 100, 100);
    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0, 10, 0, 0);
    CGRect paddedFrame = UIEdgeInsetsInsetRect(initialFrame, contentInsets);

    self.label = [[UILabel alloc] initWithFrame:paddedFrame];

Nod to CGRect Tricks . 点头CGRect技巧 。

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#5楼

For multiline text the left and the right margin can be set by using NSAttributedString. 对于多行文本，可以使用NSAttributedString设置左边距和右边距。

NSMutableParagraphStyle *style =  [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
style.alignment = NSTextAlignmentJustified;
style.firstLineHeadIndent = 10.0f;
style.headIndent = 10.0f;
style.tailIndent = -10.0f;   

NSAttributedString *attrText = [[NSAttributedString alloc] initWithString:title attributes:@{ NSParagraphStyleAttributeName : style}];  

UILabel * label = [[UILabel alloc] initWithFrame:someFrame];
label.numberOfLines = 0;
label.attributedText = attrText;

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#6楼

For Xamarin users (using Unified API): 对于Xamarin用户（使用Unified 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 ) );
    }
}

And for those using the original MonoTouch API: 对于使用原始MonoTouch API的用户：

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));
    }
}