Sub Views are not visible after change the UILabel Background colour - ios

Question

I have changed my UILabel background colour like this. Actually I have added an image to it. I did it like this.
self.lblMsg=[[UILabel alloc] initWithFrame:CGRectMake(8.0, self.lblDateTime.frame.origin.y+self.lblDateTime.frame.size.height, size.width-5.0, 100.0)];
UIImage *img = [UIImage imageNamed:#"msgBackground"];
CGSize imgSize = self.lblMsg.frame.size;
UIGraphicsBeginImageContext( imgSize );
[img drawInRect:CGRectMake(0,0,imgSize.width,imgSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
self.lblMsg.backgroundColor = [UIColor colorWithPatternImage:newImage];
[self.contentView addSubview:self.lblMsg];
Now I want to add another UILabelon to this and that label should include an image as an attachment. So I did it like this.
self.lblWeatherTitle=[[UILabel alloc] initWithFrame:CGRectMake(0.0, 0.0, self.lblMsg.frame.size.width, 50.0)];
NSTextAttachment *attachment = [[NSTextAttachment alloc] init];
attachment.image = [UIImage imageNamed:#"splashLogo"];
NSAttributedString *attachmentString = [NSAttributedString attributedStringWithAttachment:attachment];
NSMutableAttributedString *myString= [[NSMutableAttributedString alloc] initWithString:#"My label text"];
[self.lblWeatherTitle setTextColor:[UIColor redColor]];
[myString appendAttributedString:attachmentString];
self.lblWeatherTitle.attributedText = myString;
[self.lblMsg addSubview:self.lblWeatherTitle];
But My 2nd UILabel is not visible.
This is what I need to do
This black text is a long description. As the title of it it should show those red label and the yellow icon. so I added that top label as a subview to this white label. This whole thing is inside a custom UITableViewCell
Please help me. How can I do this in correct way?
Thanks