Question

这是我到目前为止所拥有的：

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，没有错误，但InputTextView和UIButton没有出现。我已经能够通过评论您在上面看到的行toolBar.addSubview(textView)来删除错误。工具栏为空。

Answer 1

您当前的代码存在两个问题。

（1）textView和sendButton都有CGRectZero尺寸的框架。

（2）您只能将UIBarButtonItem添加到UIToolbar;因此，为了将您的textView和sendButton添加到工具栏，您必须使用UIBarButtonItem将其添加到initWithCustomView，例如：

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)

如何将InputTextView和UIButton添加到iOS8中的导航控制器工具栏？

1 个答案: