新建一个ViewBased项目名xxx，将以下代码替换掉xxxViewController的viewDidLoad方法
- (void)viewDidLoad
{
NSURL * imageURL = [NSURL
URLWithString:@"http://ftp.javaeye.com/aywy7vd/javaeye/banner.jpg"];
NSData * imageData = [NSData dataWithContentsOfURL:imageURL];
UIImage * image = [UIImage imageWithData:imageData];
...
