使用iPhone sdk从URL加载图像在图像视图中？ [英] Loading image in image view from a URL, using the iPhone sdk?

问题描述

我尝试通过网址加载图片视图，从网上浏览了大量代码。不幸的是，我尝试的解决方案都没有为我工作，我得到了非常奇怪的错误。我正在获取图像数据，但没有来自此NSData的图像。我使用下面的代码和一个示例URL，它可以工作，给我代表的图像。但是，当我将其切换为使用我的实际URL时，我遇到了问题，因为它似乎试图创建/返回一个太大的图像。这是我的代码：

I've gone through a lot of code from the web in an attempt to load an image view via URL. Unfortunately, none of the solutions I tried has worked for me and I get very strange errors. I am getting image data, but no image from this NSData. I used the below code with a sample URL and it works, giving me the represented image. However when I switch it to use my actual URL I run into problems because it seems like it is attempting to create/return an image which is too large in size. Here is my code:

    NSString *urlString = [[[_xmlDictionary objectForKey:@"response"] objectForKey:@"movie"] objectForKey:@"poster"];   

    NSArray *parts = [urlString componentsSeparatedByString:@"\""];
    urlString = [parts objectAtIndex:1];

    urlString = [urlString stringByAppendingFormat:@"/"];
    urlString = [urlString  
        stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    //NSURL * imageURL = [NSURL URLWithString:urlString];
    NSLog(@"URL:%@",urlString);
    NSURL * imageURL = [NSURL URLWithString:urlString];
    NSData * imageData = [[NSData alloc] initWithContentsOfURL:imageURL];
    UIImage * image = [[UIImage alloc] initWithData:imageData];
    m_imageView = [[UIImageView alloc] initWithImage:image];
    m_imageView.frame = CGRectMake(10, 10,300,300);
    [self.view addSubview:m_imageView];
    [imageData release];
    [image release];

我很感激任何帮助，提前谢谢。

I'd appreciate any help, thanks in advance.

推荐答案

你可以转换哟你的URL到NSData的响应，然后使用

You can convert your response from your URL to NSData and then use

NSURL *url = [NSURL URLWithString:@"<YOUR URL STRING HERE>"];

NSData *data = [[NSData alloc] initWithContentsOfURL:url];

UIImage *tmpImage = [[UIImage alloc] initWithData:data];

yourImageView.image = tmpImage;

希望这会有所帮助。

编辑：

另外为了使它在后台工作，你应该以异步方式使用一个单独的线程调用它，这样它就不会阻塞你的主线程如下所示。

Also to make it work in background you should call it using a seperate thread in an asynchronous manner so that it wont block your main thread as shown below.

  [NSThread detachNewThreadSelector:@selector(downloadAndLoadImage) toTarget:self withObject:nil];

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