摘要：
方法1：能够使得背景图片可以拉伸。UIView *theMainView =[ [UIView alloc] init];UIImage *image = [UIImage imageNamed:@"bg.png"];UIImageView *imageView = [[UIImageView alloc] initWithImage:image] ;[theMainView addSubview:imageView];//这个方法两个参数分别表示左边和上边不拉升的像素UIImageView *bubble=[[UIImageView alloc] initWithImag 阅读全文