Swift字符串截取

// MARK:
// MARK: 演示
/// 演示
private func showHow() {

let originalString = "ReLIFE重返17岁";

// 从x开始到y结束
let a = xnStringHaveRange(originalString, start: 7, end: 8);

// 从前面开始 截取x个字符
let c = xnStringHaveFront(originalString, length: 6);

// 从后面开始 截取x个字符
let b = xnStringHaveBack(originalString, length: 6);

// 获取字符x 后面的字符串
let d = xnStringHaveTargetBackStirng(originalString, targetSring: "E");

// 获取字符x 前面的字符串
let e = xnStringHaveTargetFrontString(originalString, laterSring: "重");

// 获取汉字
let chinese = xnStringHaveChinese(originalString);

// 获取字符x 后面的字符串 (包含目标x)
let newStirng = xnStringHaveTargetBackStirngNewMethod(originalString, targetSring: "LIFE重");

print("原始字符串-->\(originalString)");
print("从第7开始到第8个结束-->\(a)");
print("从后面开始 截取6个字符-->\(b)");
print("从前面开始 截取6个字符-->\(c)");
print("获取字符E 后面的字符串-->\(d)");
print("获取字符重 前面的字符串-->\(e)");
print("获取汉字-->\(chinese)");
}