I'm trying to use replaceCharacters(in:with:) of NSMutableAttributedString to replace a substring and apply different attributes. The problem is strikethroughStyle is not rendered for that substring.
let s = NSMutableAttributedString(
string: "hello world!",
attributes: [.foregroundColor: UIColor.label]
)
let range = s.mutableString.range(of: "world")
s.replaceCharacters(
in: range,
with: NSAttributedString(
string: "mars",
attributes: [
.strikethroughStyle: NSUnderlineStyle.single.rawValue,
.strikethroughColor: UIColor.systemRed,
.foregroundColor: UIColor.systemRed,
]
)
)
Here, I can see that the color of the substring "mars" is changed, but there is no strikethrough line.
The same code is successfully working for iOS 13.
haldun-gh
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I've a custom UIView to render a large piece of text using CATiledLayers. My draw(rect:) implementation is quite simple:
override func draw(_ rect: CGRect) {
	let range = layoutManager.glyphRange(forBoundingRect: rect, in: textContainer)
	layoutManager.drawBackground(forGlyphRange: range, at: .zero)
	layoutManager.drawGlyphs(forGlyphRange: range, at: .zero)
}
This code works without any issue on iOS 13, but fails with a crash on iOS 14 simulator:
Thread 9: EXC_BAD_ACCESS (code=1, address=0x28)
#0 0x00007fff2396a3f5 in _NSLayoutTreeMoveToGlyphIndex ()
I can see that draw(rect:) is being called from different threads in both iOS 13 and 14. However the EXC_BAD_ACCESS has never happened so far in iOS 13.
I wonder whether this is a behaviour change in iOS 14 or an issue. If this is a change in NSLayoutManager, then is it still possible to use CATiledLayer to render large amount of text in coordination with NSLayoutManager?