如何使PHFComposeBarView控件在Swift iOS应用中处于活动状态？

debugcn 发表于 Dev

易碎的

作为iOS开发的相对菜鸟，我正在努力使PHFComposeBarView控件在我的Swift iOS应用程序中变为活动状态。

斜视了PHFComposeBarView示例应用程序的Obj-C和该SO答案后，我已尽力将基本设置转换为Swift，以便控件显示在主视图中：

在此处输入图片说明

但是，我还没有设法使该控件以编程方式变为活动状态。

我已经在Swift 2.0 / XCode 7.0 Beta 2中创建了一个最小的测试用例项目，其ViewController类似于：

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())")
    }

}

安慰：

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

怎么会composeBar.canBecomeFirstResponder()回来true却又composeBar.becomeFirstResponder()回来false呢？

另外，我不确定委托是否为可选对象是否有问题。

编辑：更新以包括调试输出。

易碎的

嗯，一种解决方案似乎是改为使用情节提要：

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
    }

}