iOS应用程序下载flickr照片
问题描述:
我正在开发一个学校的应用程序。他们将照片保存在flickr上。他们希望在他们的应用中添加照片库页面,以便从他们的flickr页面中提取照片。我想知道从flickr下载照片的最简单方法是什么: 1.我不想上传任何照片。 2.我不希望用户必须登录。 3.我无法提供个别照片的URL,因为学校可能会更新他们的flickr的频率比我更新应用程序的频率更高。我只是想让应用将他们的相册中的所有照片都拉出来。iOS应用程序下载flickr照片
非常感谢, 卢克
答
试试这个代码
-(void)getUserID{
NSString *methodName = @"flickr.people.findByUsername";
NSString *userName = @"<Your_Username>";
NSString *urlString = [NSString stringWithFormat:@"%@?method=%@&api_key=%@",kFlickrAPIURL,methodName,kFlickrAPIKey];
urlString = [NSString stringWithFormat:@"%@&username=%@&format=%@&nojsoncallback=1", urlString,userName,kFlickrResponseFormat];
NSURL *url = [NSURL URLWithString:urlString];
userIDRequest = [[NSURLRequest alloc] initWithURL: url];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:userIDRequest delegate:self];
[connection release];
}
-(void)getUserPhotos:(NSString *)userID{
NSString *methodName = @"flickr.people.getPhotos";
NSString *urlString = [NSString stringWithFormat:@"%@?method=%@&key=%@",kFlickrAPIURL,methodName,kFlickrAPIKey];
urlString = [NSString stringWithFormat:@"%@&user_id=%@&format=%@&nojsoncallback=1",urlString,userID,kFlickrResponseFormat];
NSURL *url = [NSURL URLWithString:urlString];
imagesRequest = [[NSURLRequest alloc] initWithURL: url];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:imagesRequest delegate:self];
[connection release];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
NSError *error = nil;
NSDictionary *jsonDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:&error];
if (userIDRequest == connection.originalRequest)
{
NSString *userId = [[jsonDic objectForKey:@"user"] objectForKey:@"id"];
if (userId != nil)
[self getUserPhotos:userId];
} else if (imagesRequest == connection.originalRequest) {
NSArray *photos = [[jsonDic objectForKey:@"photos"] objectForKey:@"photo"];
for (NSDictionary *photo in photos)
{
// Get title of the image
NSString *title = [photo objectForKey:@"title"];
// Build the URL to where the image is stored (see the Flickr API)
// In the format http://farmX.static.flickr.com/server/id/secret
// Notice the "_s" which requests a "small" image 75 x 75 pixels
NSString *photoURLString = [NSString stringWithFormat:@"http://farm%@.static.flickr.com", [photo objectForKey:@"farm"]];
photoURLString = [NSString stringWithFormat:@"%@/%@/%@_%@_s.jpg", photoURLString, [photo objectForKey:@"server"], [photo objectForKey:@"id"], [photo objectForKey:@"secret"]];
}
}
}