ios - 初始化 View Controller 时传递变量

Question

我有一个方法在点击按钮时运行:

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

这是 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，它也会在 awakeFromNib 方法中返回 nil 值错误，表示 currentDocumentPartTitle 为 nil。如何在调用 awakeFromNib 之前传递变量？

Answer 1

发生这种情况是因为 awakeFromNib() 在 View 的属性可分配之前执行。参见 https://stackoverflow.com/a/377390/1214800 .

为什么不直接在 viewDidLoad() 中做您需要做的事情呢？

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