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      1. 以编程方式添加时,rightAnchor 约束不适用 - swift

        rightAnchor constraint did not apply when added programmatically - swift(以编程方式添加时,rightAnchor 约束不适用 - swift)
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                  本文介绍了以编程方式添加时,rightAnchor 约束不适用 - swift的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  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.

                  这篇关于以编程方式添加时,rightAnchor 约束不适用 - swift的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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