AFNetworking上传图片之HelloWorld

AFHTTPRequestOperationManager *manager = [[AFHTTPRequestOperationManager alloc]initWithBaseURL:[NSURL URLWithString:url]];
[manager POST:url parameters:params constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
[formData appendPartWithFileData:picture name:@"picture" fileName:@"picture.png" mimeType:@"image/jpeg"];
} success:^(AFHTTPRequestOperation *operation, id responseObject) {
block(responseObject);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
block(nil);
}];