swift lazy initialization

ios 
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// {#code#}() 是执行闭包函数
lazy var someView: UIView = {
    var result = UIView()
//do something
    return result
}()
// lazy 是延迟加载的关键字，也可以直接用
lazy var someView: UIView = UIView()
// 或者
lazy var someView: UIView = SomeViewController.setupSomeView()
static func setupSomeView() -> UIView {
	// setup someView
	return someView
}