在原来又长又臭的名字基础上简单扩展下，方便使用
extension String {
/*
*去掉首尾空格
*/
var removeHeadAndTailSpace:String {
let whitespace = NSCharacterSet.whitespaceCharacterSet()
return self.stringByTrimmingCharactersInSet(whitespace)
}
/*
*去掉首尾空格 包括后面的换行 \n
*/
var removeHeadAndTailSpacePro:String {
let whitespace = NSCharacterSet.whitespaceAndNewlineCharacterSet()
return self.stringByTrimmingCharactersInSet(whitespace)
}
/*
*去掉所有空格
*/
var removeAllSapce:String {
return self.stringByReplacingOccurrencesOfString(" ", withString: "", options: .LiteralSearch, range: nil)
}
/*
*去掉首尾空格 后 指定开头空格数
*/
func beginSpaceNum(num: Int) -> String {
var beginSpace = ""
for _ in 0..<num {
beginSpace += " "
}
return beginSpace + self.removeHeadAndTailSpacePro
}
}
