2021年苹果秋季发布会之后，iOS15的推出，给开发带来了不少的适配问题。（可恶！）
没办法，那是爸爸。我改咯～😮💨
先贴上在iOS14及以下版本，正常的长截图完整代码.
- 建立一个UITableView的扩展extension
extension UITableView {
/// 获取最大高度
/// - Parameters:
/// - maxRowCount: 最大row的count
/// - maxSectionCount: 最大section的count，为0表示所有
public func getMaxHeight(with maxRowCount: Int, maxSectionCount: Int = 0) -> CGFloat {
var sectionCount = maxSectionCount
if maxSectionCount >= numberOfSections || maxSectionCount <= 0 {
sectionCount = numberOfSections
}
var maxHeight: CGFloat = tableHeaderView?.frame.size.height ?? 0;
for sectionIndex in 0..<sectionCount {
var rowCount = numberOfRows(inSection: sectionIndex)
if (rowCount > maxRowCount) {
rowCount = maxRowCount;
}
maxHeight += delegate?.tableView?(self, heightForHeaderInSection: sectionCount) ?? 0
for rowIndex in 0..<rowCount {
maxHeight += delegate?.tableView?(self, heightForRowAt: IndexPath(row: rowIndex, section: sectionIndex)) ?? 0
}
}
return maxHeight;
}
/// 获取指定高度的tableView image
/// - Parameter maxHeight: 最大高度
public func generateTableViewImage(with maxHeight: CGFloat) -> UIImage? {
var viewImage: UIImage?
let savedContentOffset = contentOffset
let savedFrame = frame
let imageHeight = maxHeight > 0 ? maxHeight :contentSize.height
var screensInTable = 0
if (frame.size.height != 0) {
screensInTable = Int(ceil(imageHeight / frame.size.height))
}
let sectionNum = numberOfSections
// autoreleasepool {
let imageSize = CGSize(width: frame.size.width, height: maxHeight)
UIGraphicsBeginImageContextWithOptions(imageSize, false, UIScreen.main.scale)
frame = CGRect(x: 0, y: 0, width: contentSize.width, height: imageHeight)
for i in 0..<screensInTable {
let contentOffset = CGPoint(x: CGFloat(0), y: CGFloat(i) * frame.size.height)
setContentOffset(contentOffset, animated: false)
// 隐藏应该移出屏幕的sectionHeader
if (style == .plain) {
for i in 0..<sectionNum {
let headerRect = rect(forSection: i)
if (headerRect.origin.y < contentOffset.y) {
setupHeaderView(with: i, true)
}
}
}
if let context = UIGraphicsGetCurrentContext() {
layer.render(in: context)
}
}
// }
viewImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
if (style == .plain) {
for i in 0..<sectionNum {
setupHeaderView(with: i, false)
}
}
frame = savedFrame
setContentOffset(savedContentOffset, animated: false)
return viewImage
}
/// 设置HeaderView的显示隐藏
/// - Parameters:
/// - section: header所在的section
/// - isHidden: 是否隐藏
private func setupHeaderView(with section: Int, _ isHidden: Bool) {
var headerView1 = headerView(forSection: section)
if nil == headerView {
headerView1 = delegate?.tableView?(self, viewForHeaderInSection: section) as? UITableViewHeaderFooterView
}
headerView1?.isHidden = isHidden
}
}
- 使用代码. 这里的10，是指最大row的数量。详细代码在extension，就不叙述了。
guard let image = longShareImageTableView.generateTableViewImage(with: longShareImageTableView.getMaxHeight(with: 10)) else {
return
}
shareImage = image
到了iOS15，截图就会缺失了一部分，举个栗子🌰
WX20211103-140003@2x.png
很是迷茫，网上好像暂时没有相应的资料和解决办法。后来在https://jishuin.proginn.com/p/763bfbd564b3这篇文章中，找到了灵感之处。
if #available(iOS 13, *) {
//iOS 13 系统截屏需要改变tableview 的bounds
scrollView.layer.bounds = CGRect(x: oldBounds.origin.x, y: oldBounds.origin.y, width: contentSize.width, height: contentSize.height)
}
//偏移量归零
scrollView.contentOffset = CGPoint.zero
//frame变为contentSize
scrollView.frame = CGRect(x: 0, y: 0, width: scrollView.contentSize.width, height: scrollView.contentSize.height)
但实测之后发现，把这段结合到自己的截图方法中后，反而会令iOS13版本的截图缺失，iOS15倒是正常了。。。😮
最后只能把代码变成iOS15之后使用了，最终的代码如下
/// 获取指定高度的tableView image
/// - Parameter maxHeight: 最大高度
public func generateTableViewImage(with maxHeight: CGFloat) -> UIImage? {
var viewImage: UIImage?
let savedContentOffset = contentOffset
let savedFrame = frame
let imageHeight = maxHeight > 0 ? maxHeight :contentSize.height
var screensInTable = 0
if (frame.size.height != 0) {
screensInTable = Int(ceil(imageHeight / frame.size.height))
}
let sectionNum = numberOfSections
// autoreleasepool {
let imageSize = CGSize(width: frame.size.width, height: maxHeight)
UIGraphicsBeginImageContextWithOptions(imageSize, false, UIScreen.main.scale)
frame = CGRect(x: 0, y: 0, width: contentSize.width, height: imageHeight)
let oldBounds = layer.bounds
if #available(iOS 15, *) {
//iOS 15 系统截屏需要改变tableview 的bounds
layer.bounds = CGRect(x: oldBounds.origin.x,
y: oldBounds.origin.y,
width: contentSize.width,
height: contentSize.height)
//偏移量归零
contentOffset = CGPoint.zero
//frame变为contentSize
frame = CGRect(x: 0, y: 0, width: contentSize.width, height: contentSize.height)
}
for i in 0..<screensInTable {
let contentOffset = CGPoint(x: CGFloat(0), y: CGFloat(i) * frame.size.height)
setContentOffset(contentOffset, animated: false)
// 隐藏应该移出屏幕的sectionHeader
if (style == .plain) {
for i in 0..<sectionNum {
let headerRect = rect(forSection: i)
if (headerRect.origin.y < contentOffset.y) {
setupHeaderView(with: i, true)
}
}
}
if let context = UIGraphicsGetCurrentContext() {
layer.render(in: context)
}
}
// }
if #available(iOS 15, *) {
layer.bounds = oldBounds
}
viewImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
if (style == .plain) {
for i in 0..<sectionNum {
setupHeaderView(with: i, false)
}
}
frame = savedFrame
setContentOffset(savedContentOffset, animated: false)
return viewImage
}
WX20211103-135835@2x.png
打完！收工！
攰死个人了😂
