我想将所有子视图属性和我的子视图设置代码放在UIView子类中,并使用loadView()将其加载到我的UIViewController子类中。然后访问UIView子类成员,而不是一直强制转换UIViewController的view属性。
这是我的UIView子类AwesomeClass
class AwesomeView: UIView {
lazy var testView:UIView = {
let view = UIView()
view.backgroundColor = UIColor.red
self.addSubview(view)
return view
}()
override init(frame: CGRect) {
super.init(frame: frame)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func layoutSubviews() {
super.layoutSubviews()
testView.frame = CGRect(x: 10
, y: 10
, width: self.bounds.size.width - 20
, height: 100)
}
}
我的UIViewController子类AwesomeViewController
class AwesomeViewController: UIViewController {
override func loadView() {
let view = AwesomeView()
self.view = view
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
我可以这样做:
var subclassedView:AwesomeView {
get {
return self.view as! AwesomeView
}
}
和
subclassedView.testView.backgroundColor = UIColor.blue
但有没有办法直接使用testView
中的self.view
致电AwesomeViewController
?
修改 我正在寻找的是Covariant return type在swift中。
答案 0 :(得分:0)
你可以这样:
在AwesomeViewController
AwesomeView
的实例
class AwesomeView: UIView {
var exampleColorVariable:UIColor?
//here you instantiate your view controller
var awesomeViewController = AwesomeViewController()
lazy var testView:UIView = {
let view = UIView()
view.backgroundColor = UIColor.red
self.addSubview(view)
return view
}()
override init(frame: CGRect) {
super.init(frame: frame)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func layoutSubviews() {
super.layoutSubviews()
testView.frame = CGRect(x: 10
, y: 10
, width: self.bounds.size.width - 20
, height: 100)
}
}
然后您可以访问AwesomeView
中的任何方法更改您的代码
class AwesomeViewController: UIViewController {
lazy var awesomeView: AwesomeView = {
let view = AwesomeView()
view.awesomeViewController = self
return view
}()
func setupView() {
view.addSubview(awesomeView)
// your constraints here
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
setupView()
// NOW YOU CAN ACCESS ANY METHOD IN YOUR VIEW awesomeView.yourFunction()
// or you access that variable
awesomeView.exampleColorVariable = .red // you can now omit UIColor in swift3
}
}