1 import Foundation
 2  3 //加载网络数据，查找数据的字符串  4 let dataurl = "http://api.k780.com:88/?app=weather.city&&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json"  5 var url = NSURL(string: dataurl)
 6 var httpData = NSData(contentsOfURL: url!)
 7 //println(httpData) //输出来都是数字 字节码  8 var httpstr = NSString(data: httpData!, encoding: NSUTF8StringEncoding)
 9 //println(httpstr) //转为NSString就是 可观的数据了。 10 let subRange = httpstr?.rangeOfString("玉山")
11 println("\(subRange!.location) 和 \(subRange!.length)")
12 13 var findRange = NSMakeRange(subRange!.location-33, 76)
14 var findStr = httpstr!.substringWithRange(findRange)
15 println(findStr)
16 17 //读取本地文件 18 let path = "/Users/HeYang/Desktop/file.txt" 19 var findfileStr = String(contentsOfFile: path, encoding: NSUTF8StringEncoding, error: nil)
20 var nsfindfileStr = NSString(string: findfileStr!)//转为NSString类型 21 println(nsfindfileStr)

运行结果：