Swift4.0字符串相关处理
字符串截取
截取某字符串的前10个字符串:
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let sub1 = str.prefix(10)
截取某字符串的后10个字符串:
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let str1 = str.suffix(10)
截取某字符串的后10个字符串,也可以换种写法:
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2let index2 = str.index(str.endIndex, offsetBy: -10)
let sub4 = str[index2..<str.endIndex]
- 截取某字符串的第3个字符到第6个字符范围的字符串
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3let index3 = str.index(str.startIndex, offsetBy: 3)
let index4 = str.index(str.startIndex, offsetBy: 6)
let sub4 = str[index3..<index4]
字符串替换
- 将手机号中间四位数隐藏
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4let phone = "13576836715"
let startIndex = phone.index(phone.startIndex, offsetBy:3)
let endIndex = phone.index(startIndex, offsetBy:4)
let result = phone.replacingCharacters(in: startIndex..<endIndex, with:"****")
结果是result = "135****6715"
Swift4.0 UITextfield限制输入位数
1 | func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool { |