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POHow to render UITableViewCell
 

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    <p>I create UITabBar template. Then I add to firstViewController a tableView. Make connections (UITableViewDataSource and UITableViewDelegate). In didselect method I need to render selected UITableViewCell and animate it to one of UITabBars. If I render UITableViewCell row = 0 - it's ok, But if I render UITableViewCell row > 0 (1,2,...) I get black rectangle. I can render UITableViewCell contentView, but it will render without background. How can I get snapshot of UITableViewCell with a background?</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; @interface AppDelegate : UIResponder &lt;UIApplicationDelegate, UITabBarControllerDelegate&gt; @property (strong, nonatomic) UIWindow *window; @property (strong, nonatomic) UITabBarController *tabBarController; @end #import "AppDelegate.h" #import "FirstViewController.h" #import "SecondViewController.h" @implementation AppDelegate @synthesize window = _window; @synthesize tabBarController = _tabBarController; - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; // Override point for customization after application launch. UIViewController *viewController1 = [[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil]; UIViewController *viewController2 = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil]; self.tabBarController = [[UITabBarController alloc] init]; self.tabBarController.viewControllers = [NSArray arrayWithObjects:viewController1, viewController2, nil]; self.window.rootViewController = self.tabBarController; [self.window makeKeyAndVisible]; return YES; } #import &lt;UIKit/UIKit.h&gt; @interface FirstViewController : UIViewController &lt;UITableViewDelegate, UITableViewDataSource&gt; @property (nonatomic, strong) IBOutlet UITableView *tableViewAnimation; @property (nonatomic, retain) UIImageView *thumbnail; - (UIImage*)screenshotFromView:(UIView *)view; @end #import "FirstViewController.h" #import &lt;QuartzCore/QuartzCore.h&gt; @implementation FirstViewController @synthesize tableViewAnimation = _tableViewAnimation; @synthesize thumbnail = _thumbnail; - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { self.title = NSLocalizedString(@"First", @"First"); self.tabBarItem.image = [UIImage imageNamed:@"first"]; } return self; } #pragma mark - UITableView DataSource - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { NSUInteger count = 10; return count; } // Customize the appearance of table view cells. - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *goodsListCellIdentifier = @"ListOfGoodsIndetifier"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:goodsListCellIdentifier]; if (cell == nil) { cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:goodsListCellIdentifier]; cell.textLabel.backgroundColor = [UIColor clearColor]; } cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; cell.textLabel.text = @"detalied view"; return cell; } #pragma mark - UITableView Delegate - (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath { cell.backgroundColor = [UIColor redColor]; } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell = [_tableViewAnimation cellForRowAtIndexPath:indexPath]; CGRect imageViewFrame = cell.frame; imageViewFrame.origin.y = 64.0 + tableView.frame.origin.y + imageViewFrame.origin.y - tableView.contentOffset.y; // imageViewFrame.size.width = cell.contentView.frame.size.width; UIImageView *imageView = [[UIImageView alloc] initWithFrame:imageViewFrame]; imageView.image = [self screenshotFromView:cell]; [self.tabBarController.view addSubview:imageView]; self.thumbnail = imageView; self.thumbnail.hidden = NO; self.view.userInteractionEnabled = NO; [UIView animateWithDuration:1.0 animations:^{ CGRect tabBarFrame = self.tabBarController.tabBar.frame; CGFloat xoffset = tabBarFrame.size.width / 2; [_thumbnail setCenter:CGPointMake(xoffset * 0.5, tabBarFrame.origin.y + 25.0)]; [_thumbnail setTransform:CGAffineTransformMakeScale(0.1, 0.1)]; [_thumbnail setAlpha:0.4]; } completion:^(BOOL finished){ [self.thumbnail removeFromSuperview]; self.thumbnail = nil; self.view.userInteractionEnabled = YES; }]; } - (UIImage*)screenshotFromView:(UIView *)view { // Create a graphics context with the target size // On iOS 4 and later, use UIGraphicsBeginImageContextWithOptions to take the scale into consideration // On iOS prior to 4, fall back to use UIGraphicsBeginImageContext CGSize imageSize = view.bounds.size; UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0); CGContextRef context = UIGraphicsGetCurrentContext(); // -renderInContext: renders in the coordinate space of the layer, // so we must first apply the layer's geometry to the graphics context CGContextSaveGState(context); // Center the context around the window's anchor point CGContextTranslateCTM(context, [view center].x, [view center].y); // Apply the window's transform about the anchor point CGContextConcatCTM(context, [view transform]); // Offset by the portion of the bounds left of and above the anchor point CGContextTranslateCTM(context, -[view bounds].size.width * [[view layer] anchorPoint].x, -[view bounds].size.height * [[view layer] anchorPoint].y); // Render the layer hierarchy to the current context [[view layer] renderInContext:context]; // Restore the context CGContextRestoreGState(context); // Retrieve the screenshot image UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return image; } @end </code></pre>
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