如何捕获完整tableView ios的屏幕截图

Question

我有一个有30行的tableView，我还有一个位于tableView顶部的视图（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，但我只能捕获tableView和视图的可见行。请帮助我，提前谢谢。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tableview标题中，因为当我们滚动tableview时，它也会滚动，这就是为什么视图是固定的）

- (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

我已经更改了Swift 3的此代码，从获取UIScrollView的屏幕截图，包括屏幕外部分

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 = UIColor.clear

    // 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
    // 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)

    // restore saved settings
    self.tableView.contentOffset = savedContentOffset;
    self.tableView.frame = savedFrame;
    self.tableView.backgroundColor = savedBackgroundColor

    UIGraphicsEndImageContext();

    return image
}