Swift Extension Substring字符串扩展方法(源码)

一直觉得自己写的不是技术，而是情怀，一个个的教程是自己这一路走来的痕迹。靠专业技能的成功是最具可复制性的，希望我的这条路能让你们少走弯路，希望我能帮你们抹去知识的蒙尘，希望我能帮你们理清知识的脉络，希望未来技术之巅上有你们也有我。

Swift Extension Substring字符串扩展方法(源码)

效果

封装是对字符串的拼接和截取操作

使用

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // 获取字符串的索引
        let num_0 = "15989954385"
        if let index = num_0.getIndexOf("3") {
            print("1字符 '3' 的索引是: \(index)")  // 输出: 字符 '3' 的索引是: 8
        }
        
        let num_1 = "15989954385"
        print("2字符串的长度是: \(num_1.length)")  // 输出: 字符串的长度是: 11
        
        let num_2 = "15989954385"
        let newNum = num_2.append("ok")
        print("3拼接后的字符串是: \(newNum)")  // 输出: 拼接后的字符串是: 15989954385ok

        let num_3 = "15989954385"
        let substring = num_3[2..<5]
        print("4截取的子串是: \(substring)")  // 输出: 截取的子串是: 989
        
        let num_4 = "15989954385"
        let substring_4 = num_4[2...5]
        print("5截取的子串是: \(substring_4)")  // 输出: 截取的子串是: 9899
        
        let num_5 = "15989954385"
        let substring_5 = num_5.substring(from: 2, to: 5)
        print("6截取的子串是: \(substring_5)")  // 输出: 截取的子串是: 9899

        let num_6 = "15989954385"
        let substring_6 = num_6.substringInclude(front: 5)
        print("7截取的子串是: \(substring_6)")  // 输出: 截取的子串是: 159899

        let num_7 = "15989954385"
        let substring_7 = num_7.substringInclude(behind: 5)
        print("8截取的子串是: \(substring_7)")  // 输出: 截取的子串是: 954385
        
        let num_8 = "15989954385"
        let substring_8 = num_8.substringNoInclude(front: 5)
        print("9截取的子串是: \(substring_8)")  // 输出: 截取的子串是: 15989

        let num_9 = "15989954385"
        let substring_9 = num_9.substringNoInclude(behind: 5)
        print("10截取的子串是: \(substring_9)")  // 输出: 截取的子串是: 54385
        
        let num_10 = "15989954385"
        let substring_10 = num_10.substringInclude(front: "99")
        print("11截取的子串是: \(substring_10)")  // 输出: 截取的子串是: 1598

        let num_11 = "15989954385"
        let substring_11 = num_11.substringInclude(behind: "99")
        print("12截取的子串是: \(substring_11)")  // 输出: 截取的子串是: 954385

        let url = "https://example.com/search?q=swift programming"
        let encodedUrl_0 = url.urlEncoded()
        print("13编码后的URL: \(encodedUrl_0)")  // 输出: 编码后的URL: https://example.com/search?q=swift%20programming
        
        let encodedUrl_1 = "https://example.com/search?q=swift%20programming"
        let decodedUrl_2 = encodedUrl_1.urlDecoded()
        print("14解码后的URL: \(decodedUrl_2)")  // 输出: 解码后的URL: https://example.com/search?q=swift programming
        
        let values = "apple,banana,orange"
        let list = values.stringForList(values: values, splitSymbol: ",")
        print("15分割后的数组: \(list)")  // 输出: 分割后的数组: ["apple", "banana", "orange"]
                
    }

}