swift String to UTF8编码
swift String to UTF8编码
var testString:String = "wo shi string"
var utf8String = (testString as NSString).UTF8String
iOS Swift 3.0 String encoding 转换
"你好".addingPercentEncoding(withAllowedCharacters: .urlHostAllowed)!
说真的，这个方法我找了俩小时。