标签显示屏幕顶部而不是在inputAccessoryView上

Question

这是我的代码：

 var messageView : UITextView = {
        var textView = UITextView()
        textView.text = "   Add your message here"
        textView.textColor = UIColor.lightGrayColor()
        textView.translatesAutoresizingMaskIntoConstraints = false
        textView.backgroundColor = UIColor.lightGrayColor()
        textView.layer.cornerRadius = 3
        textView.clipsToBounds = true
        textView.keyboardAppearance = .Dark
        textView.layer.borderWidth = 1.0
        textView.layer.borderColor = UIColor.lightGrayColor()
        textView.autocorrectionType = .no


        // MARK: Setup accesorryView

        let label = UILabel()
        label.text = "You have a 100 character limit"
        label.translatesAutoresizingMaskIntoConstraints = false

        let accessoryView = UIView(frame: CGRectMake(0, 0, UIScreen.mainScreen().bounds.width, 44))
        accessoryView.backgroundColor = UIColor.redColor()

        accessoryView.addSubview(label)

        accessoryView.leadingAnchor.constraintEqualToAnchor(label.leadingAnchor, constant: 18)
        accessoryView.centerYAnchor.constraintEqualToAnchor(label.centerYAnchor)

        textView.inputAccessoryView = accessoryView

        return textView
    }()

我正在尝试将inputAccessoryView添加到TextView的键盘中。 我的inputAccessoryView必须有一个标签，上面写着“你有100个字符限制”......

但我目前的结果如下：

蓝色的文字......正是我想要在inputAccessoryView中的标签，但它位于我的屏幕顶部...

Answer 1

您需要在约束条件的标签上将translatesAutoresizingMaskIntoConstraints设置为false，将isActive设置为true。基本上你的约束代码应如下所示：

accessoryView.leadingAnchor.constraintEqualToAnchor(label.leadingAnchor, constant: 18).isActive = true
accessoryView.centerYAnchor.constraintEqualToAnchor(label.centerYAnchor).isActive = true

Answer 2

根据我的理解，试试这个：

Swift 3

let accessoryView = UIView()
let label         = UILabel()
let counterLabel  = UILabel()//This is the counter label

label.text        = "You have a 100 character limit"
counterLabel.text = "100"

accessoryView.frame = CGRect.init(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: 44)

accessoryView.backgroundColor = UIColor.red

accessoryView.addSubview(label)
accessoryView.addSubview(counterLabel)

// to setup contraint set below property to false.
label.translatesAutoresizingMaskIntoConstraints = false
counterLabel.translatesAutoresizingMaskIntoConstraints = false

//label constrint with 0 padding from left side. To change padding from left and right side, change the constant value.
accessoryView.leadingAnchor.constraint(equalTo: label.leadingAnchor, constant: 0).isActive = true

accessoryView.centerYAnchor.constraint(equalTo: label.centerYAnchor).isActive = true

//counterl=Label constrint with 0 padding from right side
        accessoryView.trailingAnchor.constraint(equalTo:counterLabel.trailingAnchor, constant: 0).isActive = true

accessoryView.centerYAnchor.constraint(equalTo: counterLabel.centerYAnchor).isActive = true

textView.inputAccessoryView = accessoryView