请问IOS HTTP 怎么上传相册里面的图片

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
SetAFHttpManger(manager, YES);

[self HUDShow:@"正在上传头像"];

__weak typeof(self) safeSelf = self;
[manager POST:BASE_HOST(REQUEST_EDIT_HEAD_IMAGE) parameters:dictionary constructingBodyWithBlock:^(id formData) {

NSData *data = UIImagePNGRepresentation(currentHeadImage);

[formData appendPartWithFileData:data name:@"headImage" fileName:@"headImage.png" mimeType:@"image/png"];

} success:^(AFHTTPRequestOperation *operation, id responseObject) {

NSString *string = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
NSDictionary *dictionary1 = [string objectFromJSONString];
if (dictionary1) {