String总结

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/// 获取String字符串长度
str.count

/// 截取第一个关键字之前的内容
let name = "Marie Curie"
let firstSpace = name.firstIndex(of: " ") ?? name.endIndex
let firstName = name[..<firstSpace]

/// 拆分字符串为数组  
Array(name)

/// 获取前几位字符
let string = "Helloworld"
string.dropLast(string.count - 6)

/// 获取后几位字符
let string = "Helloworld"
string.dropFirst(string.count - 6)

/// 获取最后一位字符
var string = "Hellowaeorld"
string.popLast()