如何在iOS8中将InputTextView和UIButton添加到导航控制器的工具栏中? [英] How to add InputTextView and UIButton to Navigation Controller's toolbar in iOS8?

问题描述

这是我到目前为止所拥有的:

Here's what I have so far:

toolBar = self.navigationController?.toolbar
textView = InputTextView(frame: CGRectZero)
textView.backgroundColor = UIColor(white: 250/255, alpha: 1)
textView.delegate = self
textView.font = UIFont.systemFontOfSize(messageFontSize)
textView.layer.borderColor = UIColor(red: 200/255, green: 200/255, blue: 205/255, alpha:1).CGColor
textView.layer.borderWidth = 0.5
textView.layer.cornerRadius = 5
//textView.placeholder = "Message"
textView.scrollsToTop = false
textView.textContainerInset = UIEdgeInsetsMake(4, 3, 3, 3)
//textView.inputView = toolBar
//toolBar.addSubview(textView)

sendButton = UIButton.buttonWithType(.System) as UIButton
sendButton.enabled = false
sendButton.titleLabel?.font = UIFont.boldSystemFontOfSize(17)
sendButton.setTitle("Send", forState: .Normal)
sendButton.setTitleColor(UIColor(red: 142/255, green: 142/255, blue: 147/255, alpha: 1), forState: .Disabled)
sendButton.setTitleColor(UIColor(red: 1/255, green: 122/255, blue: 255/255, alpha: 1), forState: .Normal)
sendButton.contentEdgeInsets = UIEdgeInsets(top: 6, left: 6, bottom: 6, right: 6)
sendButton.addTarget(self, action: "sendAction", forControlEvents: UIControlEvents.TouchUpInside)
//toolBar.addSubview(sendButton)

self.setToolbarItems([textView, sendButton], animated: false)

// Auto Layout allows `sendButton` to change width, e.g., for localization.
textView.setTranslatesAutoresizingMaskIntoConstraints(false)
sendButton.setTranslatesAutoresizingMaskIntoConstraints(false)
toolBar.addConstraint(NSLayoutConstraint(item: textView, attribute: .Left, relatedBy: .Equal, toItem: toolBar, attribute: .Left, multiplier: 1, constant: 8))
toolBar.addConstraint(NSLayoutConstraint(item: textView, attribute: .Top, relatedBy: .Equal, toItem: toolBar, attribute: .Top, multiplier: 1, constant: 7.5))
toolBar.addConstraint(NSLayoutConstraint(item: textView, attribute: .Right, relatedBy: .Equal, toItem: sendButton, attribute: .Left, multiplier: 1, constant: -2))
toolBar.addConstraint(NSLayoutConstraint(item: textView, attribute: .Bottom, relatedBy: .Equal, toItem: toolBar, attribute: .Bottom, multiplier: 1, constant: -8))
toolBar.addConstraint(NSLayoutConstraint(item: sendButton, attribute: .Right, relatedBy: .Equal, toItem: toolBar, attribute: .Right, multiplier: 1, constant: 0))
toolBar.addConstraint(NSLayoutConstraint(item: sendButton, attribute: .Bottom, relatedBy: .Equal, toItem: toolBar, attribute: .Bottom, multiplier: 1, constant: -4.5))

return toolBar

现在，没有任何错误，但是InputTextView和UIButton没有出现.通过注释掉您在上面看到的类似于toolBar.addSubview(textView)的行，我已经能够消除错误.工具栏为空.

Right now, there are no errors but the InputTextView and UIButton do not appear. I've been able to remove errors by commenting out the lines you see above like toolBar.addSubview(textView). The toolbar is empty.

推荐答案

您当前的代码有两个问题.

There are two problems with your current code.

(1)textView和sendButton都具有CGRectZero大小的帧.

(1) Both textView and sendButton have frames of size CGRectZero.

(2)您只能将UIBarButtonItem添加到UIToolbar；因此，为了将textView和sendButton添加到工具栏中，您必须使用initWithCustomView将它们添加到UIBarButtonItem中，例如:

(2) You can only add UIBarButtonItems to a UIToolbar; so in order to add your textView and sendButton to your toolbar, you have to add them to UIBarButtonItems using initWithCustomView, ex:

toolBar = self.navigationController?.toolbar

textView = InputTextView(frame: CGRectMake(0, 0, 150, 30)) //<-- set frame greater than CGRectZero
textView.backgroundColor = UIColor(white: 250/255, alpha: 1)
textView.delegate = self
textView.font = UIFont.systemFontOfSize(messageFontSize)
textView.layer.borderColor = UIColor(red: 200/255, green: 200/255, blue: 205/255, alpha:1).CGColor
textView.layer.borderWidth = 0.5
textView.layer.cornerRadius = 5
textView.scrollsToTop = false
textView.textContainerInset = UIEdgeInsetsMake(4, 3, 3, 3)

sendButton = UIButton.buttonWithType(.System) as UIButton
sendButton.frame = CGRectMake(0, 0, 60, 30)  // <-- add frame (or use sendButton.sizeToFit() once the titleLabel has been added)
sendButton.enabled = false
sendButton.titleLabel?.font = UIFont.boldSystemFontOfSize(17)
sendButton.setTitle("Send", forState: .Normal)
sendButton.setTitleColor(UIColor(red: 142/255, green: 142/255, blue: 147/255, alpha: 1), forState: .Disabled)
sendButton.setTitleColor(UIColor(red: 1/255, green: 122/255, blue: 255/255, alpha: 1), forState: .Normal)
sendButton.contentEdgeInsets = UIEdgeInsets(top: 6, left: 6, bottom: 6, right: 6)
sendButton.addTarget(self, action: "sendAction", forControlEvents: UIControlEvents.TouchUpInside)

let textViewItem = UIBarButtonItem(customView: textView)
let sendButtonItem = UIBarButtonItem(customView: sendButton)

self.setToolbarItems([textViewItem, sendButtonItem], animated: false)

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