Hey, When I use boundingRect with String, and supply .usesFontLeading as one of the options, I get an inaccurate height for some reason. Why is that?

In the context of UILabel, If I were to calculate the height of the content I'm displaying... is it better to use textRect or boundingRect?

I'm using boundingRect to calculate the height of a String, I'm using Ubuntu as my font, and when I supply .usesFontLeading as one of the options alongside .usesLineFragmentOrigin the height is completely different to what I expect. Here is the code I'm using for reference: func height(withConstrainedWidth width: CGFloat, font: UIFont, maxLines: CGFloat = 0) -> CGFloat {         let constraintRect = CGSize(width: width, height: .greatestFiniteMagnitude)         let boundingBox = self.boundingRect(with: constraintRect, options: [.usesFontLeading, .usesLineFragmentOrigin], attributes: [             NSAttributedString.Key.font: font         ], context: nil)         var size = boundingBox.size         if maxLines > 0 {             size.height = min(size.height, CGFloat(maxLines) * font.lineHeight)         }         return ceil(size.height)     } Firstly, what does .usesFontLeading even do, and why is it that the result I'm getting an unexpected result. Note: self is String because I've extended the String class.

I've constrained a UILabel to leading, and trailing anchors, the intrinsicContentSize exceeds the anchors I've specified. Just to be sure, I added a widthAnchor as well, still no improvement. Then I added these properties: self.preferredMaxLayoutWidth = 356.25 // didn't hard code self.invalidateIntrinsicContentSize() Still the intrinsicContentSize is equal to 356.5, which is something I don't expect from my UILabel, is there anyway to fix this issue?

I have recently started Beta Testing my SwiftUI App on my iPhone 6s, previously I was testing it on the iPhone 12 Simulator. While Testing on the Real Device I encountered issues like: CPU going past 98% Really Laggy ScrollView Tab Bar Freezes Randomly Since My app is going to go in Production State in a few days, Since this is my first iOS App as well, I am not too sure if these issues are because of SwiftUI, my Phone or what, I have asked Apple Support but, haven't received a response so far. My App Stats: Lines of Code: ~1,500 CPU Usage on Simulator: Max. 10% Bundle Size: 2MB RAM Max. on Simulator: 32.3mb