在iOS 8中动态调整inputAccessoryView的大小

问题描述

基本上我正在尝试在inputAccessoryView属性中创建一个调整大小的UITextView。

Basically I am trying to create a resizing UITextView within a inputAccessoryView property.

我有一个viewController，方法canBecomeFirstResponder返回true，一个视图我通过自定义实例化class（从XIB获取）。在这个视图中是一个UITextView。

I have a viewController with the method canBecomeFirstResponder returning true and a view I instantiate via a custom class (which gets it from a XIB). Within this view is a UITextView located.

我尝试从该类内部调整完整的inputAccessoryView。我试过几个方面：直接设置框架，尝试使用高度约束。它似乎只调整了一半：

I try to resize the complete inputAccessoryView from inside of that class. I tried in in a few ways: setting the frame directy, try to use a height constraint. It appears it resizes only half way:

这基本上是我想要的（有或没有自动布局，但在iOS 7/8 +中工作）：

class MessageInputAccessory: UIView, UITextViewDelegate
{
    @IBOutlet weak var textView: UITextView!

    func textViewDidChange(textView: UITextView)
    {
        var contentSize = textView.sizeThatFits(CGSizeMake(textView.frame.size.width, CGFloat.max))

        self.frame.size.height = contentSize.height + 20

        self.textView.reloadInputViews()
    }
}

我发现这篇文章：。声明正在创建自动创建的约束。问题是，它不会为我创造约束。绝不禁用autolayout或启用autolayout（也可以通过setTranslatesAutoresizingMaskIntoConstraints（））。

I have found this post: Changing the frame of an inputAccessoryView in iOS 8. Stating that a automatically created constraint is being created. The thing is, it does not create the constraint for me. In no way, with autolayout disabled or enabled (also via setTranslatesAutoresizingMaskIntoConstraints()).

推荐答案

它适用于iOS7 / iOS8 ：

It works for me in iOS7/iOS8:

class MessageInputAccessory: UIView, UITextViewDelegate {
    private var textView: UITextView!
    private var heightConstraint: NSLayoutConstraint?

    override init(frame: CGRect) {
        super.init(frame: frame)

        commonInit()
    }

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)

        commonInit()
    }

    func commonInit() {
        self.userInteractionEnabled = true

        textView = UITextView()
        textView.delegate = self
        textView.bounces = false
        textView.scrollEnabled = false
        textView.layer.cornerRadius = 5
        textView.layer.borderWidth = 1
        textView.layer.borderColor = UIColor.blueColor().CGColor

        self.addSubview(textView)
    }

    override func layoutSubviews() {
        super.layoutSubviews()

        textView.frame = self.bounds
    }

    override func addConstraint(constraint: NSLayoutConstraint) {
        self.heightConstraint = constraint

        super.addConstraint(constraint)
    }

    func textViewDidChange(textView: UITextView) {
        var contentSize = textView.sizeThatFits(CGSizeMake(textView.frame.size.width, CGFloat.max))
        self.frame.size.height = contentSize.height

        if let heightConstraint = self.heightConstraint {
            heightConstraint.constant = self.frame.size.height
        }

        self.textView.reloadInputViews()
    }
}

---

编辑：这也适用于 xib （iOS7 / iOS8）：

---

This works with xib too (iOS7/iOS8):

class MessageInputAccessory: UIView, UITextViewDelegate {
    @IBOutlet var textView: UITextView!
    @IBOutlet var textViewHeightConstraint: NSLayoutConstraint!
    private var heightConstraint: NSLayoutConstraint?

    override func awakeFromNib() {
        textView.layer.cornerRadius = 5
        textView.layer.borderWidth = 1
        textView.layer.borderColor = UIColor.blueColor().CGColor
    }

    override func layoutSubviews() {
        textViewHeightConstraint.constant = self.bounds.size.height

        super.layoutSubviews()
    }

    override func addConstraint(constraint: NSLayoutConstraint) {
        if constraint.firstItem === self {
            self.heightConstraint = constraint
        }

        super.addConstraint(constraint)
    }

    override func addConstraints(constraints: [AnyObject]) {
        super.addConstraints(constraints)
    }

    func textViewDidChange(textView: UITextView) {
        var contentSize = textView.sizeThatFits(CGSizeMake(textView.frame.size.width, CGFloat.max))
        self.frame.size.height = contentSize.height

        if let heightConstraint = self.heightConstraint {
            heightConstraint.constant = self.frame.size.height
        }

        self.textView.reloadInputViews()
    }

    override func intrinsicContentSize() -> CGSize {
        return self.bounds.size;
    }
}

有我的xib：

There is my xib:

这不是一个很好的解决方案，但它的工作原理..请告诉我你是否知道更好的方法。

It is not a very good solution, but it works.. Please tell me if you know a better way.

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