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,
Then和SnapKit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("devxoul@gmail.com", forKey: "email")
$0.synchronize()
}
Then: Github
