swift3 - NSTextAttachment 周围的间距

Question

如何在 NSTextAttachments 周围设置间距，如下例所示？

在示例中，当我将 NSTextAttachment 附加到 NSAttributedString 时，默认行为是没有间距。

Answer 1

这在 Swift 中对我有用

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

Answer 2

在 iOS 15 下，上述答案不再适用于我。所以我最终在图像附件和属性文本之间创建并添加了一个空的“填充”附件

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)

Answer 3

为图像添加间距（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
    }
}

Answer 4

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...