我试图将一个 xib 文件作为子视图放在我的主视图控制器中,我收到一条非常奇怪的错误消息;
当我有这个代码时:
class MyViewController: UIInputViewController {
var mainView : UIView!
override func viewDidLoad() {
super.viewDidLoad()
mainView = UINib(nibName: "MainView", bundle: nil).instantiateWithOwner(self, options: nil)[0] as! UIView
self.view.addSubview(mainView)
}
}
我有这个错误信息:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Can't add self as subview' ***
但是当我有这个代码时:
class MyViewController: UIInputViewController {
override func viewDidLoad() {
super.viewDidLoad()
let subViewsArray = [
UINib(nibName: "MainView", bundle: nil).instantiateWithOwner(self, options: nil)[0] as! UIView
]
self.view.addSubview(subViewsArray[0])
}
}
或者只是这个:
class MyViewController: UIInputViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.view.addSubview(UINib(nibName: "mainView", bundle: nil).instantiateWithOwner(self, options: nil)[0] as UIView)
}
}
它正在工作......那么,为什么第一个代码不起作用!?
编辑 :
当我试图放置两个子视图时:
class MyViewController: UIInputViewController {
override func viewDidLoad() {
super.viewDidLoad()
let subViewsArray = [
UINib(nibName: "MainView", bundle: nil).instantiateWithOwner(self, options: nil)[0] as! UIView,
UINib(nibName: "AnotherView", bundle: nil).instantiateWithOwner(self, options: nil)[0] as! UIView
]
self.view.addSubview(subViewsArray[0])
self.view.addSubview(subViewsArray[1])
}
}
它不再使用相同的错误消息:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Can't add self as subview' ***