swift笔记

1 如何将数据转换成自己枚举值

rawValue 用于swift中的enum(枚举)，用于取枚举项的原始值

//枚举 注意WirelessType:Int Int 要写上
  enum WirelessType:Int {
    
        case addition
        case substraction
        case multiplication
        case division
    }


  let sourceArr = ["1","3","2"];
        //获取值转换成string
        let numberString = sourceArr[1] as! String;
        //将string转化成int （?? 5）将默认值设为5
        let number = Int(numberString) ?? 5;
        //rawValue: 根据mmm获取对应枚举值
        let number_Emum =  WirelessType(rawValue: number);
        if number_Emum == WirelessType.multiplication {
    
            print("就是就是将数据");
        }

2 判断本地值（UserDefaults）是否存在

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创建tableview（不注册方法）

  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 使用masonary

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

5 swift中使用oc的block

OC回调

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

swift使用

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

6 根据类名获取对应类

//需要在前面拼接项目文件名
  let workName = Bundle.main.infoDictionary?["CFBundleExecutable"] as! String
        let className: String = workName + "." + "类名";
        guard let class_VC = NSClassFromString(className) as? UIViewController.Type else{
    
            //没有对应类！
            return;
        }
        //实例化一个
        let vc = class_VC.init()