swift 3.0 字符串截取
2016-10-25 16:35
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var str = "Hello, playground" //let index = str.index(str.startIndex, offsetBy: 5) //str.substring(to: index) let strlength:Int = str.characters.count - 10 let index = str.index(str.startIndex, offsetBy: strlength) str.substring(to: index) str.substring(from: index) let start = str.index(str.startIndex, offsetBy: 1) let end = str.index(str.endIndex, offsetBy: 0) let range = start..<end str.substring(with: range)
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