中心NSTextAttachment图像旁边的单行UILabel [英] Center NSTextAttachment image next to single line UILabel

问题描述

我想将NSTextAttachment图像附加到我的属性字符串并将其垂直居中。

I'd like to append an NSTextAttachment image to my attributed string and have it centered vertically.

我使用以下代码创建我的字符串

I've used the following code to create my string

        NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:DDLocalizedString(@"title.upcomingHotspots") attributes:attrs];
        NSTextAttachment *attachment = [[NSTextAttachment alloc] init];
        attachment.image = [[UIImage imageNamed:@"help.png"] imageScaledToFitSize:CGSizeMake(14.f, 14.f)];
        cell.textLabel.attributedText = [str copy];

但是，图像看起来与单元格textLabel的顶部对齐。

However, the image appears to align to the top of the cell's textLabel.

如何更改绘制附件的矩形？

How can I change the rect in which the attachment is drawn?

推荐答案

您可以通过子类化来更改矩形 NSTextAttachment 并覆盖 attachmentBoundsForTextContainer：proposedLineFragment：glyphPosition：characterIndex：。示例：

You can change the rect by subclassing NSTextAttachment and overriding attachmentBoundsForTextContainer:proposedLineFragment:glyphPosition:characterIndex:. Example:

- (CGRect)attachmentBoundsForTextContainer:(NSTextContainer *)textContainer proposedLineFragment:(CGRect)lineFrag glyphPosition:(CGPoint)position characterIndex:(NSUInteger)charIndex {
    CGRect bounds;
    bounds.origin = CGPointMake(0, -5);
    bounds.size = self.image.size;
    return bounds;
}

这不是一个完美的解决方案。您必须通过眼睛找出Y原点，如果您更改字体或图标大小，您可能想要更改Y原点。但我无法找到更好的方法，除非将图标放在单独的图像视图中（这有其自身的缺点）。

It's not a perfect solution. You have to figure out the Y-origin "by eye" and if you change the font or the icon size, you'll probably want to change the Y-origin. But I couldn't find a better way, except by putting the icon in a separate image view (which has its own disadvantages).

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