Swift notes

1 How to convert data into their own enumeration values

rawValue be used for swift Medium enum( enumeration ), Used to get the original value of the enumeration item

// enumeration   Be careful WirelessType:Int Int  To write 
  enum WirelessType:Int {
    
        case addition
        case substraction
        case multiplication
        case division
    }


  let sourceArr = ["1","3","2"];
        // Get the value and convert it to string
        let numberString = sourceArr[1] as! String;
        // take string Turn it into int （?? 5） Set the default value to 5
        let number = Int(numberString) ?? 5;
        //rawValue:  according to mmm Get the corresponding enumeration value 
        let number_Emum =  WirelessType(rawValue: number);
        if number_Emum == WirelessType.multiplication {
    
            print(" Is to put the data ");
        }

2 Judge local value （UserDefaults） Whether there is

let loginMessage:Optional<NSDictionary> = UserDefaults.standard.value(forKey: "loginMessage") as? NSDictionary;
            
        if !(loginMessage == nil) {
    
            username = loginMessage?["loginName"] as! String;
            password = loginMessage?["password"] as! String;
        }

3 establish tableview（ Do not register method ）

  var cell:LTextViewRTextView_Rebuild!
        if tableView.dequeueReusableCell(withIdentifier: "cell") == nil {
    
            cell = LTextViewRTextView_Rebuild(style: .subtitle, reuseIdentifier: "cell");
        }else{
    
            cell = (tableView.dequeueReusableCell(withIdentifier: "cell") as! LTextViewRTextView_Rebuild);
        }
        return cell;

4 swift Use masonary

  let addView = UIView.init();
        self.view.addSubview(addView);
        addView.mas_makeConstraints {
     (make: MASConstraintMaker? ) in
            make?.width.equalTo()(100);
        };

5 swift Use in oc Of block

OC Callback

@property (nonatomic,copy) void(^changeSelectBlock)(NSString *nowSelectCode);
@property (nonatomic,copy) void(^changeSelectBlock_New)(NSString *nowSelectCode,NSString *nowSelectCodeTwo);

swift Use

 collectionScreenView.changeSelectBlock = {
     nowSelectCode in
            
        };
collectionScreenView.changeSelectBlock_New = {
    nowSelectCode , nowSelectCodeTwo in
            
        };

6 Get the corresponding class according to the class name

// You need to splice the project file name in front 
  let workName = Bundle.main.infoDictionary?["CFBundleExecutable"] as! String
        let className: String = workName + "." + " Class name ";
        guard let class_VC = NSClassFromString(className) as? UIViewController.Type else{
    
            // No corresponding class ！
            return;
        }
        // Instantiate a 
        let vc = class_VC.init()