如何在 SwiftUI 中动态计算字符串的宽度 [英] How to figure out the width of a string dynamically in SwiftUI

问题描述

假设我有一个名为:This 的文本.我想弄清楚名为 This 的文本的宽度，以便我可以为另一个视图的框架分配一个宽度.我该怎么做?

Let's say I have a text called: This. I want to figure out the width of the text called This so that I can assign a width to another view's frame. How do I go about it?

struct BadgeTextView: View {

var text: String

var body: some View {
    Rectangle()
        .fill(Color.red)
    .cornerRadius(3)
        .frame(width: text.???, height: <#T##CGFloat?#>, alignment: <#T##Alignment#>)

}
}  

推荐答案

这个对 String 的扩展应该建立在 Sweeper 的建议之上，让你获得一个 String 的宽度给定某种字体:

This extension to String should build on Sweeper's suggestion to let you get the width of a String given a certain font:

extension String {
   func widthOfString(usingFont font: UIFont) -> CGFloat {
        let fontAttributes = [NSAttributedString.Key.font: font]
        let size = self.size(withAttributes: fontAttributes)
        return size.width
    }
}

这将像这样使用:let width = "SomeString".widthOfString(usingFont: UIFont.systemFont(ofSize: 17, weight: .bold))

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