ios - 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 View 和 tableview 的所有行，但是我只能捕获表格 View 和 View 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 View 位于表格 View 标题中，因为当我们滚动表格 View 时它也会滚动，这就是 View 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

我已将 Swift 3 的代码从 Getting a screenshot of a UIScrollView, including offscreen parts 更改为

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
}