49 lines
2.2 KiB
Swift
49 lines
2.2 KiB
Swift
//
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// String.swift
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// MusicPlayer
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//
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// Created by Mr.Zhou on 2024/4/7.
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//
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import Foundation
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extension String {
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/// 字符串转类type
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func classFromString() -> AnyClass? {
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// 获swift中的命名空间名
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var name = Bundle.main.object(forInfoDictionaryKey: "CFBundleExecutable") as? String
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// 如果包名中有'-'横线这样的字符，在拿到包名后，还需要把包名的'-'转换成'_'下横线
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name = name?.replacingOccurrences(of: "-", with: "_")
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// 拼接命名空间和类名，”包名.类名“
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let fullClassName = name! + "." + self
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// 因为NSClassFromString()返回的AnyClass?，需要给个默认值返回!
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let anyClass: AnyClass? = NSClassFromString(fullClassName)
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// 类type
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return anyClass
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}
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//MARK: - 字符串扩展
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///根据宽度跟字体，计算文字的高度
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func textAutoHeight(width:CGFloat, font:UIFont) ->CGFloat{
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let string = self as NSString
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let origin = NSStringDrawingOptions.usesLineFragmentOrigin
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let lead = NSStringDrawingOptions.usesFontLeading
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let ssss = NSStringDrawingOptions.usesDeviceMetrics
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let rect = string.boundingRect(with:CGSize(width: width, height:0), options: [origin,lead,ssss], attributes: [NSAttributedString.Key.font:font], context:nil)
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return rect.height
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}
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///根据高度跟字体，计算文字的宽度
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func textAutoWidth(height:CGFloat, font:UIFont) ->CGFloat{
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let string = self as NSString
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let origin = NSStringDrawingOptions.usesLineFragmentOrigin
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let lead = NSStringDrawingOptions.usesFontLeading
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let rect = string.boundingRect(with:CGSize(width:0, height: height), options: [origin,lead], attributes: [NSAttributedString.Key.font:font], context:nil)
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return rect.width
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}
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}
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extension Range where Bound == String.Index {
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func toNSRange(in string: String) -> NSRange {
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let utf16IndexStart = string.utf16.distance(from: string.utf16.startIndex, to: lowerBound)
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let utf16IndexEnd = string.utf16.distance(from: string.utf16.startIndex, to: upperBound)
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return NSRange(location: utf16IndexStart, length: utf16IndexEnd - utf16IndexStart)
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}
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}
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