NSTextAttachment周围的间距

Question

如何使NSTextAttachments周围有间距，就像下面的示例一样？

在示例中，当我将NSTextAttachment添加到NSAttributedString中时，默认行为是没有间距的。

- Morten Gustafsson

---

添加空格，还是添加NSKernAttributeName？没有默认的空格，就像连续书写两个字母一样，但是这里不是字母，而是图像。 - Larme

我尝试了NSKernAttributeName，但它没有起作用。 - Morten Gustafsson

在它们之间添加 NSAttributedString *space = [[NSAttributedString alloc] initWithString: @" "] 吗？ - Larme

像上面建议的那样，一个空格并不能提供任何精度，但它可以作为一个快速而丑陋的解决方案。 - Jonny

Answer 1

以上解决方案在iOS 15下不再适用。因此，我最终创建并添加了一个空的“填充”附件，放置于图像附件和属性文本之间。

let padding = NSTextAttachment()
//Use a height of 0 and width of the padding you want
padding.bounds = CGRect(width: 5, height: 0) 
            
let attachment = NSTextAttachment(image: image)
let attachString = NSAttributedString(attachment: attachment)

//Insert the padding at the front
myAttributedString.insert(NSAttributedString(attachment: padding), at: 0)

//Insert the image before the padding
myAttributedString.insert(attachString, at: 0)

- simeon

Answer 2

这在Swift中对我奏效了。

public extension NSMutableAttributedString {    
    func appendSpacing( points : Float ){
        // zeroWidthSpace is 200B
        let spacing = NSAttributedString(string: "\u{200B}", attributes:[ NSAttributedString.Key.kern: points])
        append(spacing)
    }
}

- Jason

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嗯，似乎在iOS 15上出了问题。可能是TextKit2的问题。https://dev59.com/8lEG5IYBdhLWcg3wQoNw - Ded77

Answer 3

NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] init];
// append NSTextAttachments instance to attributedText...
// then add non-printable string with NSKernAttributeName attributes
unichar c[] = { NSAttachmentCharacter };
NSString *nonprintableString = [NSString stringWithCharacters:c length:1];
NSAttributedString *spacing = [[NSAttributedString alloc] initWithString:nonprintableString attributes:@{
    NSKernAttributeName : @(4) // spacing in points
}];
[attributedText appendAttributedString:spacing];

// finally add other text...

- ZkTsin

Answer 4

这个扩展使得添加所需的空间变得容易。它还可以在iOS 16上运行。

extension NSMutableAttributedString {
     func appendSpace(_ width: Double) {
         let space = NSTextAttachment()
         space.bounds = CGRect(x:0, y: 0, width: width, height: 0)
         append(NSAttributedString(attachment: space))
    }
}

// usages
let example = NSMutableAttributedString()
example.appendSpace(42)
...

- coco

Answer 5

在图像中添加间距（适用于iOS 15）。

extension UIImage {
    func imageWithSpacing(insets: UIEdgeInsets) -> UIImage? {
        UIGraphicsBeginImageContextWithOptions(
            CGSize(width: self.size.width + insets.left + insets.right,
                   height: self.size.height + insets.top + insets.bottom), false, self.scale)
        UIGraphicsGetCurrentContext()
        let origin = CGPoint(x: insets.left, y: insets.top)
        self.draw(at: origin)
        let imageWithInsets = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return imageWithInsets
    }
}

- hstdt