问题
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
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.
回答1:
There are two problems with your current code.
(1) Both textView and sendButton have frames of size CGRectZero.
(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)
来源：https://stackoverflow.com/questions/27672076/how-to-add-inputtextview-and-uibutton-to-navigation-controllers-toolbar-in-ios8