如何捕获完整的tableView ios 屏幕截图

Question

我有一个有 30 行的 tableView，并且在 tableView 的顶部还有一个 View（不在 tableview 标题中），我想捕获屏幕的完整屏幕截图，包括视图和 tableview 的所有行，但我可以只能捕获表视图和视图的可见行。请帮助我并提前致谢。 这是我的代码和模拟器的屏幕截图。 注意（我不希望我的视图位于表视图标题中，因为当我们滚动表视图时它也会滚动，这就是视图被固定的原因）

- (void)viewDidLoad {
    [super viewDidLoad];


    _myTableView.delegate = self;
    _myTableView.dataSource = self;

     UIBarButtonItem *next = [[UIBarButtonItem alloc]initWithTitle:@"Next" style:UIBarButtonItemStylePlain target:self action:@selector(nextButtonAction)];
     UIBarButtonItem *screenShot = [[UIBarButtonItem alloc]initWithTitle:@"Screenshot" style:UIBarButtonItemStylePlain target:self action:@selector(screenshotButtonAction)];

    self.navigationItem.leftBarButtonItem = screenShot;
    self.navigationItem.rightBarButtonItem = next;


 }

-(void)nextButtonAction
{

    NextViewController *myVc = [[UIStoryboard storyboardWithName:@"Main" bundle:nil]instantiateViewControllerWithIdentifier:@"NextViewController"];
     NSLog(@"value of image is %@",viewImage);
     myVc.myImage = viewImage;
    [self.navigationController pushViewController:myVc animated:YES];

}

-(void)screenshotButtonAction
{

    UIView *viewToRender = self.myTableView;
    CGPoint contentOffset = self.myTableView.contentOffset;
     UIGraphicsBeginImageContext(viewToRender.bounds.size);
     CGContextRef ctx = UIGraphicsGetCurrentContext();
      CGContextTranslateCTM(ctx, 0,-contentOffset.y ); //-contentOffset.y
     [viewToRender.layer renderInContext:ctx];
     viewImage = UIGraphicsGetImageFromCurrentImageContext();
     UIGraphicsEndImageContext();
  }


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
     return  30;
 }
- (UITableViewCell )tableView:(UITableView )tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

     static   NSString *myString = @"reused";
     UITableViewCell *Cell = [tableView dequeueReusableCellWithIdentifier:myString];
    if (Cell == nil)
    {
         Cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:myString];
    }
     Cell.textLabel.text = [NSString stringWithFormat:@"This is Cell %ld",indexPath.row];
    return Cell;
 }

Answer 1

我已经从 获取 UIScrollView 的屏幕截图，包括屏幕外部分更改了 Swift 3 的代码

编辑：2022 - TableView 在屏幕截图后恢复

 func screenshot() -> UIImage{
    
    var image = UIImage();
    UIGraphicsBeginImageContextWithOptions(self.tableView.contentSize, false, UIScreen.main.scale)
    
    // save initial values
    let savedContentOffset = self.tableView.contentOffset;
    let savedFrame = self.tableView.frame;
    let savedBackgroundColor = self.tableView.backgroundColor
    
    // reset offset to top left point
    self.tableView.contentOffset = CGPoint(x: 0, y: 0);
    // set frame to content size
    self.tableView.frame = CGRect(x: 0, y: 0, width: self.tableView.contentSize.width, height: self.tableView.contentSize.height);
    // remove background
    self.tableView.backgroundColor = self.tableView.backgroundColor;
    
    // make temp view with scroll view content size
    // a workaround for issue when image on ipad was drawn incorrectly
    let tempView = UIView(frame: CGRect(x: 0, y: 0, width: self.tableView.contentSize.width, height: self.tableView.contentSize.height));
    
 
    
    // save superview
    let tempSuperView = self.tableView.superview
    
    // Save constraints
    guard let superView = self.tableView.superview else {
        return UIImage();
    }
    
    //get old constraints from table
    var oldConstraints: [NSLayoutConstraint] = []
    for constraint in superView.constraints {
        if constraint.firstItem as? NSObject == self.tableView || constraint.secondItem as? NSObject == self.tableView{
           oldConstraints.append(constraint)
       }
    }
    
    // remove scrollView from old superview
    self.tableView.removeFromSuperview()
    // and add to tempView
    tempView.addSubview(self.tableView)
    
    // render view
    // drawViewHierarchyInRect not working correctly
    tempView.layer.render(in: UIGraphicsGetCurrentContext()!)
    // and get image
    image = UIGraphicsGetImageFromCurrentImageContext()!;
    
    // and return everything back
    tempView.subviews[0].removeFromSuperview()
    tempSuperView?.addSubview(self.tableView)
    
    //activate table's old constraints
    NSLayoutConstraint.activate(oldConstraints)
    
    // restore saved settings
    self.tableView.contentOffset = savedContentOffset;
    self.tableView.frame = savedFrame;
    self.tableView.backgroundColor = savedBackgroundColor
     
    UIGraphicsEndImageContext();
    
    
    return image
}

Answer 2

他们不需要在任何地方添加屏幕，我们可以通过计算高度直接获取视图的屏幕截图

public func getEntireTable(completion: @escaping(_ image: UIImage?)->()){
    let stackView = UIView()
    stackView.frame = self.frame
    stackView.frame.origin = .zero
    stackView.frame.size = self.contentSize
    var ypos: CGFloat = 0.0
    var height : CGFloat = 0.0
   let group = DispatchGroup()
    group.enter()
    for i in 0..<self.numberOfSections{
        for j in 0..<self.numberOfRows(inSection: i){
            self.scrollToRow(at: IndexPath(row: j, section: i), at: .none, animated: false)
            if let cell = self.cellForRow(at: IndexPath(item: j, section: i)){
                var v = cell.contentView
                v.frame.origin.y = ypos
                stackView.addSubview(v)
                ypos += cell.contentView.frame.height ?? 0
                height += cell.contentView.frame.height
                if i == self.numberOfSections - 1 && j == self.numberOfRows(inSection: i)-1{
                    stackView.frame.size.height = height
                    group.leave()
                }
            }
        }
    }
    group.wait()
    group.notify(queue: .main, execute: {[weak self] in
        if let snap = self?.snapshot(view: stackView) as? UIImage{
            completion(snap)
        }
    })
}

func snapshot(view: UIView) -> UIImage {
    UIGraphicsBeginImageContextWithOptions(view.frame.size, false, UIScreen.main.scale)
    view.layer.render(in: UIGraphicsGetCurrentContext()!)
    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return image!
}