NSString *urlString = @"http://img4.bitauto.com/autoalbum/files/20100226/003/201002260944098032_1155951_4.jpg";

NSURL *url = [NSURL URLWithString:urlString];

NSData *myData = [NSData dataWithContentsOfURL: url];

UIImage *myImage = [UIImage imageWithData: myData];

UIImageView *myImageView = [[UIImageView alloc] initWithImage: myImage];

UIScrollView *myScrollView = [[UIScrollView alloc] initWithFrame: CGRectMake(0, 0, 320, 480)];

myScrollView.contentSize = CGSizeMake(myImage.size.width, myImage.size.height;

[self.view addSubview: myScrollView];

[myScrollView release];

[myScrollView addSubview: myImageView];

[myImageView release];

如果返回url是nil，则用下面的代码代替：

NSURL *url = [NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];