ios - 如何使 PHFComposeBarView 控件在 Swift iOS 应用程序中变为事件状态？

Question

作为 iOS 开发的相对菜鸟，我正在努力制作 PHFComposeBarView控件在我的 Swift iOS 应用程序中变为事件状态。

斜眼看着 PHFComposeBarView example app 中的 Obj-C和 this SO answer ，我已尽我所能将基本设置转换为 Swift，以便控件显示在主视图中:

但是，我还没有设法使控件以编程方式激活。

我创建了一个 minimal test case project在 Swift 2.0/XCode 7.0 Beta 2 中，其 ViewController 如下所示:

ViewController.swift:

import UIKit
import PHFComposeBarView

class ViewController: UIViewController, PHFComposeBarViewDelegate {

    var composeBar: PHFComposeBarView {
        let viewBounds = self.view.bounds
        let frame = CGRectMake(0.0, viewBounds.size.height - PHFComposeBarViewInitialHeight, viewBounds.size.width, PHFComposeBarViewInitialHeight)
        let composeBarView = PHFComposeBarView(frame: frame)
        composeBarView.delegate = self
        return composeBarView
    }

    override var inputAccessoryView: UIView {
        return self.composeBar
    }

    override func canBecomeFirstResponder() -> Bool {
        return true
    }

    override func viewDidAppear(animated: Bool) {
        print("viewDidAppear self \(self)")
        print("composeBar.delegate \(self.composeBar.delegate)")
        print("composeBar.textView.delegate \(self.composeBar.textView.delegate)")
        print("composeBar.canBecomeFirstResponder() \(self.composeBar.canBecomeFirstResponder())")
        print("composeBar.textView.canBecomeFirstResponder() \(self.composeBar.textView.canBecomeFirstResponder())")
        let res = self.composeBar.becomeFirstResponder()
        print("composeBar.becomeFirstResponder() \(res)")
        print("composeBar.isFirstResponder() \(self.composeBar.isFirstResponder())")
        print("composeBar.textView.isFirstResponder() \(self.composeBar.textView.isFirstResponder())")
    }

}

控制台:

viewDidAppear self <SwiftPHFComposeBarTest.ViewController: 0x7fe088619d90>
composeBar.delegate Optional(<SwiftPHFComposeBarTest.ViewController: 0x7fe088619d90>)
composeBar.textView.delegate Optional(<PHFDelegateChain: 0x7fe088654850>)
composeBar.canBecomeFirstResponder() true
composeBar.textView.canBecomeFirstResponder() true
composeBar.becomeFirstResponder() false
composeBar.isFirstResponder() false
composeBar.textView.isFirstResponder() false

怎么可能 composeBar.canBecomeFirstResponder() 返回 true 但 composeBar.becomeFirstResponder() 返回 false?

另外，我不确定委托(delegate)是可选的是否有问题。

编辑:更新为包含调试输出。

Answer 1

好吧，一个解决方案似乎是 use the storyboard instead :

ViewController.swift:

import UIKit
import PHFComposeBarView

class ViewController: UIViewController, PHFComposeBarViewDelegate {

    @IBOutlet weak var composeBarView: PHFComposeBarView!

    override func viewDidLoad() {
        super.viewDidLoad()
        composeBarView.delegate = self
    }

    override func canBecomeFirstResponder() -> Bool {
        return true
    }

    override var inputAccessoryView: UIView {
        composeBarView.removeFromSuperview()
        return composeBarView
    }

}