SizeToFit sometimes sizes the Label too small

[MFJones21]

So I am using your Label (awesome work btw) in my App and I need the label to be exactly the size of its content. So overtime the latex is changed i apply sizeToFit() this works fine in long statements but in shorter ones (for example just x) some of the content is cut. How do I fix it ?

Thanks a lot for your help and contribution to this awesome project !

All my best,
Jony

[kostub]

Can you provide an example where the sizeToFit returns an incorrect size? It is supposed to be exact.

[AnZhg]

@kostub I had the same issue. I modified sizeThatFits method in MTMathLabel.m into something like this:

if (calculatedWidth >= size.width) {
    size.width = calculatedWidth;
}
if (calculatedHeight >= size.height) {
    size.height = calculatedHeight;
}

Quick but dirty fix.

[MFJones21]

So this is the code I am using:

let label = MTMathUILabel()
label.frame = CGRect(x: 15, y: 60, width: 1, height: 1)
label.latex = "x"
label.sizeToFit()
label.textColor = UIColor.red
label.backgroundColor = UIColor.blue
self.view.addSubview(label)

I changed the colours to make this clearer.
And this is what I am getting.

[gitgobrr]

MTMathUILabel.m file.
adding 4-3 pixels to size.width and size.height will solve the problem.

[kostub]

Fixed by #263 (building on #262).

sizeThatFits: / intrinsicContentSize previously used advance-based width. For ink-heavy glyphs — and short expressions like a single italic x — that reported a frame slightly narrower than the painted ink, clipping the right edge. That's the bug people worked around here by adding a few pixels. The size is now computed from the ink extent and rounded up to the device-pixel grid, so it fully contains the glyphs without a manual fudge. This will be in the next release.