Download, Create and Display an Image from URL

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原创最新推荐文章于 2026-08-26 20:02:46 发布 142 阅读 AI 写同款· GEO 优化 ›

Posted on November 4, 2009 by John Muchow in Cocoa

This tip will show the steps to download and display an image from a remote resource. This is handy if you need to add an image as a subview, yet, the image is not part of your application bundle.

URL to Remote Image

We start by creating a URL to the remote resource:

NSURL *url = [NSURL URLWithString: 
   @"http://iphonedevelopertips.com/images/logo-iphone-dev-tips.png"];

Create UIImage from NSData

The next step is to build a UIImage using the data downloaded from the URL, which consists of an NSData object that holds the remote image contents:

UIImage *image = [UIImage imageWithData: [NSData dataWithContentsOfURL:url]];

Putting it Together

Here’s how to wrap it all together, adding the remote image as a subview to an existing view by creating a UIImageView from the above UIImage:

NSURL *url = [NSURL URLWithString: 
   @"http://iphonedevelopertips.com/images/logo-iphone-dev-tips.png"];
UIImage *image = [UIImage imageWithData: [NSData dataWithContentsOfURL:url]]; 
[self.view addSubview:[[UIImageView alloc] initWithImage:image]];