Swift语法糖---初始化Then

Then是一个swift初始化库,只有80几行的代码库,确可以让初始化变得很优雅

  • 使用then初始化AnyObject,这里以初始化控件为例
    lazy var label = UILabel().then({
        $0.text = "label"
        $0.textColor = .blue
    })
    let redView = UIView().then { (make) in
        make.backgroundColor = .red
        make.frame = CGRect(x: 50, y: 50, width: 100, height: 100)
    }
    let button = UIButton().then ({
            $0.setTitle("点我", for: .normal)
            $0.setTitleColor(.red, for: .normal)
        })
  • 如果布局这样还不简单那就只能来骚的了,ThenSnapKit一起使用的方式
    let button1 = UIButton().then { (make) in
            make.setTitle("登录", for: .normal)
            make.setTitleColor(.black, for: .normal)
            view.addSubview(make)
            
            make.snp.makeConstraints({ (make) in
                make.top.left.right.equalTo(0)
                make.height.equalTo(100)
            })
        }
  • 或者你还可以这样
    let button2 = UIButton().then({
        $0.setTitle("登录", for: .normal)
        $0.setTitleColor(.black, for: .normal)
        view.addSubview($0)
        
        $0.snp.makeConstraints({
            $0.top.equalTo(button1.snp.bottom)
            $0.left.right.equalTo(0)
            $0.height.equalTo(50)
        })
      })
  • 其他用法
    let newFrame = oldFrame.with {
          $0.size.width = 200
          $0.size.height = 100
    }
    newFrame.width // 200
    newFrame.height // 100
    UserDefaults.standard.do {
        $0.set("devxoul", forKey: "username")
        $0.set("[email protected]", forKey: "email")
        $0.synchronize()
    }

Then: Github

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