从UISplitViewDetail创建一个代理到在Swift中掌握的错误 [英] errors creating a delegate from UISplitViewDetail to master in Swift

问题描述

SWIFT / IOS 8.2
我试图将我的 CalculatorViewController 设置为委托目标，以便我可以获取数据 - 但是我似乎设置错误： EXC_BAD_ACCESS（code：2）

SWIFT / IOS 8.2 I am trying to set my CalculatorViewController as the delegate target so I can get data - but I seem to be setting it wrong: "EXC_BAD_ACCESS (code:2)"

（GraphView.swift）

(in GraphView.swift)

protocol CalculatorViewDataSource: class {
    func calculateYForXEquals(sender: CalculatorViewController, currentX: CGFloat) ->CGFloat?
}

class GraphView: UIView {
    weak var calculatorViewDataSource: CalculatorViewDataSource?
    //...
}

（在GraphViewController.swift中）

(in GraphViewController.swift)

class GraphViewController: UIViewController {
    @IBOutlet weak var graphView: GraphView! {
        didSet{
            graphView.calculatorViewDataSource = self.view.superview?.superview as CalculatorViewController
        }
    }
// ...
}

（在CalculatorViewController.swift中）

(in CalculatorViewController.swift)

class CalculatorViewController: UIViewController, CalculatorViewDataSource{
    // ...
}

func calculateYForXEquals(sender: CalculatorViewController, currentX: CGFloat) ->CGFloat? {
    return nil
}

问题：

当我尝试在GraphViewController中设置代理时，我遇到了一个EXC_BAD_ACCESS（code：2）错误...任何想法为什么？

I get a crash with a "EXC_BAD_ACCESS (code:2)" error when I try to set the delegate in the GraphViewController... Any idea why?

我不知道如何从 CalculatorViewController 级别进入课堂。
这是故事板：

I don't know how to get to the class from the CalculatorViewController level. Here's the storyboard:

-> SplitViewController - NavigationController - (Master) CalculatorViewController
         I
     NavigationController - (Detail) GraphViewController

推荐答案

尝试这样做：

    var graphViewController: GraphViewController?

    private func setupSplitViewController() {
        let masterNavigationController: AnyObject? = splitViewController?.viewControllers.first
        graphViewController = masterNavigationController!.topViewController as? GraphViewController
        graphViewController!.graphView.calculatorViewDataSource = self
    }

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