iOS 8.4 - iboutlet没有在编程创建的视图控制器中填充 [英] iOS 8.4 - iboutlet not populating in programmatically created view controllers

问题描述

在iOS 8.4中以编程方式加载UIViewController时，我一直看到IBOutlets注册为nil。这导致任何iOS 8.4设备崩溃。完全相同的代码在iOS 9和9.0.1上顺利运行。作为参考，这是视图控制器的片段

When loading a UIViewController programmatically in iOS 8.4 I am consistently seeing the IBOutlets registering as nil. This is causing crashes on any iOS 8.4 device. The exact same code runs smoothly on iOS 9 and 9.0.1. For reference, this is a snippet of the view controller

class B8AVPermissionsViewController: B8BaseViewController {

    @IBOutlet weak var closeButton: UIButton!
    @IBOutlet weak var cameraButton: UIButton!
    @IBOutlet weak var microphoneButton: UIButton!

    var delegate: B8PermissionRequestingDelegate? = nil;

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
    }

    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated);
        NSLog("cameraButton: \(cameraButton)")
    }

打印出 cameraButton：nil

创建它的代码如下所示：

The code that creates this looks like:

self.permissionViewController = B8AVPermissionsViewController()
self.permissionViewController!.delegate = self
dispatch_async(dispatch_get_main_queue(), {
    self.presentViewController(self.permissionViewController!, animated: true, completion: nil)
})

我做错了什么？

推荐答案

问题是iOS 8中存在错误。说 iOS 8中的B8AVPermissionsViewController（）不会自动加载关联的笔尖。你需要解决这个问题;例如，您可以显式调用 init（nibName：bundle :) ，然后告诉它是nib所在的位置。

The problem is that there's bug in iOS 8. Saying B8AVPermissionsViewController() in iOS 8 does not automatically load the associated nib. You need to work around this; for example, you could call init(nibName:bundle:) explicitly and tell it where the nib is.

该错误已在iOS 9中修复，这就是为什么你没有看到同样的问题。

The bug is fixed in iOS 9, which is why you're not seeing the same problem there.

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