Question

这是有问题的代码

    // auto layout
    let vertivalConstraint = textField.centerYAnchor.constraint(equalTo: self.codeView.centerYAnchor)
    let leadingConstraint = textField.leadingAnchor.constraint(equalTo: self.codeView.leadingAnchor, constant: 10)
    let trailingConstraint = textField.trailingAnchor.constraint(equalTo: self.codeView.trailingAnchor, constant: -10)
    let heightConstraint = textField.heightAnchor.constraint(equalTo: nil, constant: 37)
    NSLayoutConstraint.activate([leadingConstraint, vertivalConstraint, trailingConstraint, heightConstraint])

让heightConstraint返回标题中的错误。我该如何解决这个问题。

由于

Answer 1

也许试试：

// auto layout
    let vertivalConstraint = textField.centerYAnchor.constraint(equalTo: self.codeView.centerYAnchor)
    let leadingConstraint = textField.leadingAnchor.constraint(equalTo: self.codeView.leadingAnchor, constant: 10)
    let trailingConstraint = textField.trailingAnchor.constraint(equalTo: self.codeView.trailingAnchor, constant: -10)
    let heightConstraint = textField.heightAnchor.constraint(equalToConstant: 37)
    NSLayoutConstraint.activate([leadingConstraint, vertivalConstraint, trailingConstraint, heightConstraint])

我正在使用：

.constraint(equalToConstant: 37)

而不是：

.heightAnchor.constraint(equalTo: nil, constant: 37)

Nil与预期参数类型不兼容＆＃39; NSLayoutAnchor <nslayoutdimention>＆＃39;

1 个答案: