如何增加inputAccessoryView的高度

Question

我已经花了好几天没有解决方案了.

我有inputAccessoryView一个UIView包含一个textView和两个按钮.该行为符合inputAccessoryView预期,除了一个以外在所有情况下都能正常工作.

当textView的高度增加时,我试图增加inputAccessoryView相同数量的高度.当我重新定义的高度inputAccessoryView中textViewDidChange,该inputAccessoryView增加的高度向下在键盘上,而不是向上.

我从SO那里尝试了许多不同的建议,但没有任何效果.我想这是自动添加NSLayoutConstraint的,inputAccessoryView但我不知道如何在swift和iOS 8.3中更改该值.

func textViewDidChange(textView: UITextView) {

    var contentSize = messageTextView.sizeThatFits(CGSizeMake(messageTextView.frame.size.width, CGFloat.max))

    inputAccessoryView.frame.size.height = contentSize.height + 16

}

加入

inputAccessoryView.setTranslatesAutoresizingMaskIntoConstraints(true)

到上面的代码帮助和inputAccessoryView高度正确向上增加但是我得到无法同时满足几个约束的约束,并且很难识别违规者.另外,我得到了textView在新行的每个第二个实例上创建额外空间的奇怪效果.

谢谢.

Answer 1

要使输入附件视图垂直增长,您只需设置它autoresizingMask = .flexibleHeight,计算它intrinsicContentSize并让框架完成剩下的工作.

代码:

class InputAccessoryView: UIView, UITextViewDelegate {

    let textView = UITextView()

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

        // This is required to make the view grow vertically
        self.autoresizingMask = UIView.AutoresizingMask.flexibleHeight

        // Setup textView as needed
        self.addSubview(self.textView)
        self.textView.translatesAutoresizingMaskIntoConstraints = false
        self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[textView]|", options: [], metrics: nil, views: ["textView": self.textView]))
        self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[textView]|", options: [], metrics: nil, views: ["textView": self.textView]))

        self.textView.delegate = self

        // Disabling textView scrolling prevents some undesired effects,
        // like incorrect contentOffset when adding new line,
        // and makes the textView behave similar to Apple's Messages app
        self.textView.isScrollEnabled = false
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override var intrinsicContentSize: CGSize {
        // Calculate intrinsicContentSize that will fit all the text
        let textSize = self.textView.sizeThatFits(CGSize(width: self.textView.bounds.width, height: CGFloat.greatestFiniteMagnitude))
        return CGSize(width: self.bounds.width, height: textSize.height)
    }

    // MARK: UITextViewDelegate

    func textViewDidChange(_ textView: UITextView) {
        // Re-calculate intrinsicContentSize when text changes
        self.invalidateIntrinsicContentSize()
    }

}