UITextView添加一个图片背景

//initWithFrame 用来创建一个ui的x,y,w,h 

UITextView *textView=[[UITextView alloc]initWithFrame:CGRectMake(0, 0, self.tableView.frame.size.width, 120)];

//textView.bounds返回CGRect，该imageView用于填充背景

UIImageView *imgView=[[UIImageView alloc] initWithFrame:textView.bounds];

imgView.image=[UIImage imageNamed:@"bg.png"];

//addSubview方法

[textView addSubview:imgView];

//sendSubviewToBack 将该subview置于最底层

[textView sendSubviewToBack:imgView];