以编程方式添加时，rightAnchor 约束不适用 - swift

问题描述

当我添加 rightAnchor 约束时，常量 = 20 不适用.在leftAnchor就可以了

When I Added rightAnchor constraint, constant= 20 did not apply. In leftAnchor is ok

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

    addSubview(collectionView)
    collectionView.translatesAutoresizingMaskIntoConstraints = false
    NSLayoutConstraint.activate([collectionView.leftAnchor.constraint(equalTo: leftAnchor, constant: 20),
                                 collectionView.topAnchor.constraint(equalTo: self.topAnchor),
                                 collectionView.rightAnchor.constraint(equalTo: rightAnchor, constant: 20),
                                 collectionView.heightAnchor.constraint(equalTo: self.heightAnchor)])
}

有人可以帮我吗?

推荐答案

我有一种强烈的感觉，那就是你想要为 rightAnchor 做的事情.

I have a really strong feeling that this is what you wanted to do there for rightAnchor.

collectionView.rightAnchor.constraint(equalTo: rightAnchor, constant: -20)

如果你想从右边或底部填充，你应该使用负值.

If you want padding from the right or bottom you should use negative values.

经验法则:任何东西留下或向上的东西都是负面的.

Rule of thumb: Whatever is left or upwards of something is negative.

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