最近开发的项目使用的是swift语言，在强大的项目工期压力下，推着自己不断的摸索swift，以下为自己摸索过程中的一下小tips：
字符串转数组
let str = "1,2,3,4,5"
let arr = str.components(separatedBy: ",")
数组转字符串(源码注释解释)
public func joined(separator: String = default) -> String
/// Returns a new string by concatenating the elements of the sequence,
/// adding the given separator between each element.
///
/// The following example shows how an array of strings can be joined to a
/// single, comma-separated string:
///
/// let cast = ["Vivien", "Marlon", "Kim", "Karl"]
/// let list = cast.joined(separator: ", ")
/// print(list)
/// // Prints "Vivien, Marlon, Kim, Karl"
///
/// - Parameter separator: A string to insert between each of the elements
/// in this sequence. The default separator is an empty string.
/// - Returns: A single, concatenated string.
CGFloat输出控制
String(format: "%.2f", 1.9999999)
通过字符串查找控制器，并且进行跳转
let nameSpace = Bundle.main.infoDictionary!["CFBundleExecutable"] as! String
let Claz = NSClassFromString(nameSpace + "." + "controllerName") as! UIViewController.Type
let vc = Claz.init()
navigationController?.pushViewController(vc, animated: true)
不定时更新ing~
