为什么子元素不填写父元素呢？
为什么子元素不填写父元素呢？
提问于 2022-04-16 17:20:24
有一个橙色背景的scrollView，它有一个白色背景的图像，一个灰色标签和一个按钮。ScrollView填充整个屏幕，包括状态栏。我怎样才能使图像也进入状态栏，而不被附加到它的底部？
NSLayoutConstraint.activate([
scrollView.topAnchor.constraint(equalTo: view.topAnchor),
scrollView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor),
scrollView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor),
scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
image.topAnchor.constraint(equalTo: scrollView.topAnchor),
image.leadingAnchor.constraint(equalTo: scrollView.safeAreaLayoutGuide.leadingAnchor),
image.trailingAnchor.constraint(equalTo: scrollView.safeAreaLayoutGuide.trailingAnchor),
image.heightAnchor.constraint(equalToConstant: 100),
label.topAnchor.constraint(equalTo: image.bottomAnchor),
label.leadingAnchor.constraint(equalTo: scrollView.safeAreaLayoutGuide.leadingAnchor),
label.trailingAnchor.constraint(equalTo: scrollView.safeAreaLayoutGuide.trailingAnchor),
label.heightAnchor.constraint(equalToConstant: 1000),
button.topAnchor.constraint(equalTo: label.bottomAnchor),
button.leadingAnchor.constraint(equalTo: scrollView.safeAreaLayoutGuide.leadingAnchor),
button.trailingAnchor.constraint(equalTo: scrollView.safeAreaLayoutGuide.trailingAnchor),
button.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor)
])回答 1
Stack Overflow用户
回答已采纳
发布于 2022-04-16 21:09:59
到你最喜欢的搜索引擎去搜索UIScrollView contentLayoutGuide frameLayoutGuide
为了使内容滚动，需要对滚动视图的.contentLayoutGuide进行约束。
要正确调整内容的大小--例如填充滚动视图的宽度，因此我们只有垂直滚动--您需要对滚动视图的.frameLayoutGuide进行引导和尾随约束。
将您的约束条件与此进行比较：
NSLayoutConstraint.activate([
scrollView.topAnchor.constraint(equalTo: view.topAnchor),
scrollView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor),
scrollView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor),
scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
image.topAnchor.constraint(equalTo: scrollView.contentLayoutGuide.topAnchor),
image.leadingAnchor.constraint(equalTo: scrollView.contentLayoutGuide.leadingAnchor),
image.trailingAnchor.constraint(equalTo: scrollView.contentLayoutGuide.trailingAnchor),
image.heightAnchor.constraint(equalToConstant: 100),
// make the image view the Width of the scroll view
image.widthAnchor.constraint(equalTo: scrollView.frameLayoutGuide.widthAnchor),
label.topAnchor.constraint(equalTo: image.bottomAnchor),
label.leadingAnchor.constraint(equalTo: scrollView.contentLayoutGuide.leadingAnchor),
label.trailingAnchor.constraint(equalTo: scrollView.contentLayoutGuide.trailingAnchor),
label.heightAnchor.constraint(equalToConstant: 1000),
// make the label the Width of the scroll view
label.widthAnchor.constraint(equalTo: scrollView.frameLayoutGuide.widthAnchor),
button.topAnchor.constraint(equalTo: label.bottomAnchor),
button.leadingAnchor.constraint(equalTo: scrollView.contentLayoutGuide.leadingAnchor),
button.trailingAnchor.constraint(equalTo: scrollView.contentLayoutGuide.trailingAnchor),
// make the button the Width of the scroll view
button.widthAnchor.constraint(equalTo: scrollView.frameLayoutGuide.widthAnchor),
button.bottomAnchor.constraint(equalTo: scrollView.contentLayoutGuide.bottomAnchor)
])页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/71895975
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