UIImageView* imageView = [[UIImageView alloc] initWithFrame:self.view.bounds];
imageView.image = [UIImage imageNamed:@"背景灰.png"];
self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"背景灰.png"]];
原文：http://www.cnblogs.com/SimonGao/p/4561304.html