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
在Swift 3中,你可以通过创建UILabel的子类来达到你想要的效果。在这个子类中,你必须添加一个UIEdgeInsets属性,并覆盖drawText(In:)方法,intrinsicContentSize属性(用于自动布局代码)和/或sizeThatFits(_:)方法(用于Springs和Struts代码)。
import UIKit
class PaddingLabel: UILabel {
let padding: UIEdgeInsets
// Create a new PaddingLabel instance programamtically with the desired insets
required init(padding: UIEdgeInsets = UIEdgeInsets(top: 0, left: 10, bottom: 0, right: 10)) {
self.padding = padding
super.init(frame: CGRect.zero)
}
// Create a new PaddingLabel instance programamtically with default insets
override init(frame: CGRect) {
padding = UIEdgeInsets.zero // set desired insets value according to your needs
super.init(frame: frame)
}
// Create a new PaddingLabel instance from Storyboard with default insets
required init?(coder aDecoder: NSCoder) {
padding = UIEdgeInsets.zero // set desired insets value according to your needs
super.init(coder: aDecoder)
}
override func drawText(in rect: CGRect) {
super.drawText(in: UIEdgeInsetsInsetRect(rect, padding))
}
// Override `intrinsicContentSize` property for Auto layout code
override var intrinsicContentSize: CGSize {
let superContentSize = super.intrinsicContentSize
let width = superContentSize.width + padding.left + padding.right
let height = superContentSize.height + padding.top + padding.bottom
return CGSize(width: width, height: height)
}
// Override `sizeThatFits(_:)` method for Springs & Struts code
override func sizeThatFits(_ size: CGSize) -> CGSize {
let superSizeThatFits = super.sizeThatFits(size)
let width = superSizeThatFits.width + padding.left + padding.right
let heigth = superSizeThatFits.height + padding.top + padding.bottom
return CGSize(width: width, height: heigth)
}
}
下面的例子展示了如何在UIViewController中使用PaddingLabel实例:
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var storyboardAutoLayoutLabel: PaddingLabel!
let autoLayoutLabel = PaddingLabel(padding: UIEdgeInsets(top: 20, left: 40, bottom: 20, right: 40))
let springsAndStructsLabel = PaddingLabel(frame: CGRect.zero)
var textToDisplay = "Lorem ipsum dolor sit er elit lamet."
override func viewDidLoad() {
super.viewDidLoad()
// Set autoLayoutLabel
autoLayoutLabel.text = textToDisplay
autoLayoutLabel.backgroundColor = .red
autoLayoutLabel.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(autoLayoutLabel)
autoLayoutLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 30).isActive = true
autoLayoutLabel.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
// Set springsAndStructsLabel
springsAndStructsLabel.text = textToDisplay
springsAndStructsLabel.backgroundColor = .green
view.addSubview(springsAndStructsLabel)
springsAndStructsLabel.frame.origin = CGPoint(x: 30, y: 90)
springsAndStructsLabel.sizeToFit()
// Set storyboardAutoLayoutLabel
storyboardAutoLayoutLabel.text = textToDisplay
storyboardAutoLayoutLabel.backgroundColor = .blue
}
// Link this IBAction to a UIButton or a UIBarButtonItem in Storyboard
@IBAction func updateLabelText(_ sender: Any) {
textToDisplay = textToDisplay == "Lorem ipsum dolor sit er elit lamet." ? "Lorem ipsum." : "Lorem ipsum dolor sit er elit lamet."
// autoLayoutLabel
autoLayoutLabel.text = textToDisplay
// springsAndStructsLabel
springsAndStructsLabel.text = textToDisplay
springsAndStructsLabel.sizeToFit()
// storyboardAutoLayoutLabel
storyboardAutoLayoutLabel.text = textToDisplay
}
}
其他回答
设置标签的textAlignment属性为NSTextAlignmentRight并增加它的宽度。
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));
}
}
没有子类和所有的爵士。我动态地做了这个:
[cell.textLabel setTranslatesAutoresizingMaskIntoConstraints:NO];
[cell.textLabel constraintTrailingEqualTo:cell.contentView constant:-100];
约束部分只是一个简单的代码糖纸(我们有相同的方法从上/下/左/右添加填充)..如果我在这里得到足够的爱,我将开放整个包装:
- (id)constraintTrailingEqualTo:(UIView *)toView constant:(CGFloat)constant
{
NSLayoutConstraint *cn = [NSLayoutConstraint constraintWithItem:self
attribute:NSLayoutAttributeTrailing
relatedBy:NSLayoutRelationEqual
toItem:toView
attribute:NSLayoutAttributeTrailing
multiplier:1 constant:constant];
[toView addConstraint:cn];
return self;
}
(注意,我是在
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath;
你可能需要调用[self setNeedsLayout];这取决于你的语境。
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
要扩展Brody Robertson提供的答案,您可以添加IB可设计位。这意味着您可以在Storyboard中调整标签。
在你的子类UILabel做
#import <UIKit/UIKit.h>
IB_DESIGNABLE
@interface insetLabel : UILabel
@property (nonatomic, assign) IBInspectable CGFloat leftEdge;
@property (nonatomic, assign) IBInspectable CGFloat rightEdge;
@property (nonatomic, assign) IBInspectable CGFloat topEdge;
@property (nonatomic, assign) IBInspectable CGFloat bottomEdge;
@property (nonatomic, assign) UIEdgeInsets edgeInsets;
@end
然后做;
#import "insetLabel.h"
@implementation insetLabel
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
self.edgeInsets = UIEdgeInsetsMake(self.topEdge, self.leftEdge, self.bottomEdge, self.rightEdge);
}
return self;
}
- (void)drawTextInRect:(CGRect)rect
{
self.edgeInsets = UIEdgeInsetsMake(self.topEdge, self.leftEdge, self.bottomEdge, self.rightEdge);
[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
EDIT
你应该为edgeInsets添加一个setter方法。
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