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Background 'Watermark' type image for UIViewController
UIImage *bgImage = [UIImage imageNamed:@"watermark.png"];
self.view.layer.contents = bgImage.CGImage;
self.view.backgroundColor = [UIColor clearColor];

self.view.layer.contents = (id)bgImage.CGImage;

UIImageView *backgroundImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"your_image.png"]];
[self.view addSubview:backgroundImage];
[self.view sendSubviewToBack:backgroundImage];
[backgroundImage release];

UIImage *bgImage = [UIImage imageNamed:@"watermark.png"];
 UIImageView *imageView = [[UIImageView alloc] initWithImage:bgImage];
 [cell.contentView addSubview: imageView];