Swift - 12 错误

Swift 中可以通过Error协议自定义运行时错误信息

enum SomeError : Error {
   
   case illegalArg(String)
   case outOfBound(Int,Int)
   case outOfMemory
   
}


func divide(_ num1: Int, _ num2: Int) throws ->  Int {
   
   
   if num2 == 0 {
       throw SomeError.illegalArg("0不能作为除数")
   }
   return num1/num2
}

class ViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        
        do {
            print("2")
            try divide(10, 0) // 如果这里就抛出异常了，那么后面的打印也不会进行了[图片上传中...(截屏2022-02-24 下午8.46.17.png-85ba5d-1645706788983-0)]

             print("3")
             print("4")
             print("5")
        } catch let SomeError.illegalArg(msg){
            print(msg)
        } catch {
            print("test")
        }
    }
}

截屏2022-02-24 下午8.46.17.png