初始化viewcontroller时传递变量(passing variable when viewcontroller is initialized)

初始化viewcontroller时传递变量(passing variable when viewcontroller is initialized)

点击按钮时我有一个方法运行：

let tempVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("AwardViewController") as! AwardViewController tempVC.currentDocumentPartTitle = currentDocumentPart.title

这里是AwardViewController类，

class AwardViewController: UIViewController { @IBOutlet weak var textView: UITextView! var currentDocumentPartTitle: String! override func awakeFromNib() { super.awakeFromNib() //assigning text to UITextView in awakeFromNib method //In order to find right textfile, currentDocumentPartTitle is used to search right data in plist. }

问题是，即使我传递变量，它在awakeFromNib方法中返回nil值错误，说currentDocumentPartTitle为nil。 如何在调用awakeFromNib之前传递变量？

I have a method running when a button is tapped:

let tempVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("AwardViewController") as! AwardViewController tempVC.currentDocumentPartTitle = currentDocumentPart.title

And here is AwardViewController class,

class AwardViewController: UIViewController { @IBOutlet weak var textView: UITextView! var currentDocumentPartTitle: String! override func awakeFromNib() { super.awakeFromNib() //assigning text to UITextView in awakeFromNib method //In order to find right textfile, currentDocumentPartTitle is used to search right data in plist. }

The problem is that even if I pass the variable, it returns nil value error in awakeFromNib method saying currentDocumentPartTitle is nil. How do I pass a variable before awakeFromNib is called?

最满意答案

发生这种情况是因为在视图的属性可分配之前执行了awakeFromNib() 。 请参阅https://stackoverflow.com/a/377390/1214800 。

为什么不在viewDidLoad()简单地做你需要做的事情？

override func viewDidLoad() { super.viewDidLoad() print(currentDocumentPartTitle!) // works! }

This happens because awakeFromNib() is performed before the view's properties are allocatable. See https://stackoverflow.com/a/377390/1214800.

Why not simply do what you need to do inside of viewDidLoad()?

override func viewDidLoad() { super.viewDidLoad() print(currentDocumentPartTitle!) // works! }