我们能否通过 UIStackView 实现这一点，最初将其作为垂直轴，然后最终将成为水平轴，反之亦然？
如果使用 NSAutoLayout，如何实现？
如果有人可以向我提供示例来源或此处的任何提示都会有所帮助，则需要帮助。
最佳答案
更新答案
感谢@Fogmeister
首先我制作了两个 StackView 一个保持可命名和 profileImage
bigStackView持有第一个stackView和followButton
这样的约束
BigStackView:
我之所以在左侧和右侧添加 20 个点，是因为如果我将其设置为 0，则跟随按钮将靠近屏幕边缘!
堆栈 View : 你不需要在这个 stackView 上添加约束
个人资料图片:
NameLable:
关注图片:
然后我在向下滚动时使它们的间距相等，间距为 5
但是向上滚动时，StackView 的间距将为 15，因此个人资料图像将远离 nameLable(这就是我添加两个 stackView 以便控制间距的原因)
并且还向 stackView 添加了 160 点的高度约束 向上滚动时将其更改为100点
代码会变成这样
import UIKit
class ViewController: UIViewController , UITableViewDelegate , UITableViewDataSource {
@IBOutlet weak var bigStackView: UIStackView!
@IBOutlet weak var StackView: UIStackView!
@IBOutlet weak var StackViewHight: NSLayoutConstraint!
@IBOutlet weak var progileHight: NSLayoutConstraint!
@IBOutlet weak var profileWidth: NSLayoutConstraint!
var rowsNames = ["Row 0", "Row 1", "Row 2", "Row 3", "Row 4", "Row 5",
"Row 6", "Row 7", "Row 8", "Row 9", "Row 10", "Row 11",
"Row 12", "Row 13", "Row 14", "Row 15", "Row 16", "Row 17",
"Row 18", "Row 19", "Row 20", "Row 21", "Row 22", "Row 23",
"Row 24", "Row 25", "Row 26", "Row 27", "Row 28", "Row 29", "Row 20"]
// we set a variable to hold the contentOffSet before scroll view scrolls
var lastContentOffset: CGFloat = 0
override func viewDidLoad() {
super.viewDidLoad()
}
// MARK: - UITableViewDataSource
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return rowsNames.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
cell.textLabel?.text = rowsNames[indexPath.row]
return cell
}
// this delegate is called when the scrollView (i.e your UITableView) will start scrolling
func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
self.lastContentOffset = scrollView.contentOffset.y
}
// while scrolling this delegate is being called so you may now check which direction your scrollView is being scrolled to
func scrollViewDidScroll(_ scrollView: UIScrollView) {
if (self.lastContentOffset < scrollView.contentOffset.y) {
// moved to top
UIView.animate(withDuration: 0.5,
animations: {
// Change Hight and Witdh of profileImage (make it smaller)
self.progileHight.constant = 50
self.profileWidth.constant = 50
self.bigStackView.axis = .horizontal
self.StackView.axis = .horizontal
// Change spacing between profileImage and nameLable
self.StackView.spacing = 15
// Make BigStackView Smaller
self.StackViewHight.constant = 100
self.view.layoutIfNeeded()
})
} else if (self.lastContentOffset > scrollView.contentOffset.y) {
// moved to bottom
UIView.animate(withDuration: 0.5,
animations: {
// return Hight and Witdh of profileImage to its orginal size
self.progileHight.constant = 100
self.profileWidth.constant = 100
self.bigStackView.axis = .vertical
self.StackView.axis = .vertical
// return spacing between profileImage and nameLable to the orginal space
self.StackView.spacing = 5
// return BigStackView to its orginal size
self.StackViewHight.constant = 160
self.view.layoutIfNeeded()
})
} else {
// didn't move
}
}
}
结果将是:
旧答案:
我不认为你可以通过 UIStackView 实现这一点
但用 UIView 做起来很容易
首先像这样制作你的 StoryBoard
然后添加约束
界面 View :
个人资料图片:
名称标签:
跟随按钮:
我确实在每台 iPhone 设备和 iPad 上进行了测试，约束没有被打破
那么你只需要使用 UIView.animate
并四处移动元素
代码是这样的
import UIKit
class ViewController: UIViewController , UITableViewDelegate , UITableViewDataSource {
var rowsNames = ["Row 0", "Row 1", "Row 2", "Row 3", "Row 4", "Row 5",
"Row 6", "Row 7", "Row 8", "Row 9", "Row 10", "Row 11",
"Row 12", "Row 13", "Row 14", "Row 15", "Row 16", "Row 17",
"Row 18", "Row 19", "Row 20", "Row 21", "Row 22", "Row 23",
"Row 24", "Row 25", "Row 26", "Row 27", "Row 28", "Row 29", "Row 20"]
@IBOutlet weak var squareView: UIView!
@IBOutlet weak var hightView: NSLayoutConstraint!
@IBOutlet weak var profileImage: UIImageView!
@IBOutlet weak var followButton: UIButton!
@IBOutlet weak var nameLable: UILabel!
// we set a variable to hold the contentOffSet before scroll view scrolls
var lastContentOffset: CGFloat = 0
override func viewDidLoad() {
super.viewDidLoad()
}
// MARK: - UITableViewDataSource
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return rowsNames.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
cell.textLabel?.text = rowsNames[indexPath.row]
return cell
}
// this delegate is called when the scrollView (i.e your UITableView) will start scrolling
func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
self.lastContentOffset = scrollView.contentOffset.y
}
// while scrolling this delegate is being called so you may now check which direction your scrollView is being scrolled to
func scrollViewDidScroll(_ scrollView: UIScrollView) {
if (self.lastContentOffset < scrollView.contentOffset.y) {
// moved to top
self.hightView.constant = 100
UIView.animate(withDuration: 0.5,
animations: {
self.profileImage.transform = CGAffineTransform(translationX:-150, y: -15).scaledBy(x: 0.5, y: 0.5)
self.followButton.transform = CGAffineTransform(translationX:130, y: -110)
self.nameLable.transform = CGAffineTransform(translationX:-95, y: -80)
self.view.layoutIfNeeded()
})
} else if (self.lastContentOffset > scrollView.contentOffset.y) {
// moved to bottom
UIView.animate(withDuration: 0.5,
animations: {
self.hightView.constant = 206
self.profileImage.transform = CGAffineTransform.identity
self.followButton.transform = CGAffineTransform.identity
self.nameLable.transform = CGAffineTransform.identity
self.view.layoutIfNeeded()
})
} else {
// didn't move
}
}
}
我所做的是检测用户是否向上或向下滚动
向上滚动时
我改变了 UIView 的高度 更改 ProfileImage 的位置并使其缩小一半 然后更改 namaLable 和 followButton
当它向下滚动时 我将高尺寸恢复为原始尺寸 并使用
将其余 View 返回到其原始大小CGAffineTransform.identity
结果是
我希望这个解决方案对你来说很常见
关于iOS 内容从水平到垂直动画，反之亦然，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/46300415/