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
你需要计算UILabel大小,当你放置嵌入。它可以有不同的行数,因为文本对齐,换行模式。
override func drawText(in rect: CGRect) {
let size = self.sizeThatFits(UIEdgeInsetsInsetRect(rect, insets).size);
super.drawText(in: CGRect.init(origin: CGPoint.init(x: insets.left, y: insets.top), size: size));
}
override var intrinsicContentSize: CGSize {
var size = super.intrinsicContentSize;
if text == nil || text?.count == 0 {
return size;
}
size = self.sizeThatFits(UIEdgeInsetsInsetRect(CGRect.init(origin: CGPoint.zero, size: size), insets).size);
size.width += self.insets.left + self.insets.right;
size.height += self.insets.top + self.insets.bottom;
return size;
}
尝试 iEun/InsetLabel
其他回答
为UILabel添加填充的最佳方法是子类化UILabel并添加一个edgeInsets属性。然后设置所需的插图,标签将相应地绘制。
OSLabel.h
#import <UIKit/UIKit.h>
@interface OSLabel : UILabel
@property (nonatomic, assign) UIEdgeInsets edgeInsets;
@end
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
我认为UILabel类没有设置边距的方法。为什么不把标签的位置设置在需要的位置?
见下面的代码:
UILabel *label = [[UILabel alloc] init];
label.text = @"This is label";
label.frame = CGRectMake(0,0,100,100);
如果来自接口构建器,则按以下方式定位Label:
yourLabel.frame = CGRectMake(0,0,100,100);
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));
}
}
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])
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
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