swift String extension

概述extension String { func substr(pos: Int, len:Int = -1) -> String { if pos + len > count(self) { return "" } let start = advance(self.startIndex, pos) le

extension String {    func substr(pos: Int,len:Int = -1) -> String {        if pos + len > count(self) {            return ""        }        let start = advance(self.startIndex,pos)        let end = (-1 == len ?self.endindex :advance(self.startIndex,pos + len))        return self.substringWithRange(Range(start:start,end:end))    }        func split(sep: String) -> [String] {        returnself.componentsSeparatedByString(sep)    }        func find(substr: String) ->Int? {        if let range = self.rangeOfString(substr) {            return distance(self.startIndex,range.startIndex)        } else {            return nil        }    }        func findLast(substr: String) -> Int? {        if let range = self.rangeOfString(substr,options:NsstringCompareOptions.BackwardsSearch) {            return distance(self.startIndex,range.startIndex)        } else {            return nil        }    }        func trimmed() -> String {        returnself.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())    }        func replace(before: String,after:String) -> String {        return self.stringByReplacingOccurrencesOfString(before,withString: after)    }    func date() -> String {        var curDate = NSDate()        var timeFormatter = NSDateFormatter()        timeFormatter.dateFormat = self // "yyyyMMddHHmmss"        return timeFormatter.stringFromDate(curDate)    }        func date(date: NSDate) -> String {        var timeFormatter = NSDateFormatter()        timeFormatter.dateFormat = self        return timeFormatter.stringFromDate(date)    }}

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