Question

我需要从网址下载图片并将其加载到UIIamge视图

首先我从URL获取图像，但数据返回nil我不知道为什么？

 -(UIImage *) getImageFromURL:(NSString *)fileURL {
        UIImage * result;
    // data here return with nil 
        NSData * data = [NSData dataWithContentsOfURL:[NSURL URLWithString:fileURL]];
        result = [UIImage imageWithData:data];

        return result;
    }

Answer 1

您可以使用AFNetworking

只需使用：- (void)setImageWithURL:(NSURL *)url;

或更复杂的事情：

UIImageView image;
NSString *urlstring = [NSString stringWithFormat:@"http://url/"];
NSURL *url = [NSURL URLWithString:urlstring];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[image setImageWithURLRequest:request
              placeholderImage:[UIImage imageNamed:@"placeholder.png"]
                       success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image){
                            // Succes on loading image
                       }
                       failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error){
                            // Fail to load image
                       }];

Answer 2

您可以通过以下网址链接设置图片：

  NSString *your_url = @"http://your_link/";
  image_View.image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL   URLWithString:your_url]]];

另请参阅：

1）question 1

2）question 2

3）question 3

ios - 从web url xcode下载并查看图像

2 个答案: