[置顶] iOS使用AFN上传单张、多张图片

iOS在上传图片时，AFN专门封装了一个上传文件的方法，但是这里需要特别强调的是name和mineType

[formData appendPartWithFileData:imageData name:[NSString stringWithFormat:@"file%d",i+1] fileName:[NSString stringWithFormat:@"file%d.jpg/png",i+1] mimeType:@"image/jpeg"]; 

name：服务器后台文件名的key，后台会根据这个字段获取相应的图片字节流

data: 需要上传的二进制数据

fileName：文件名带上后缀

mineType：文件类型

方法调用：

+ (void)uploadImagesWithImages:(NSArray<UIImage *> *)imageArray url:(NSString *)urlStr Parameters:(NSDictionary *)parameters success:(void (^)(id responseObject))success failure:(void (^)(NSError *error))failure {
    [manager POST:urlStr parameters:parameters constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
        int imageCount = 0;
        for (UIImage *image in imageArray) {
            NSString *mineType = @"image/jpeg";
            NSString *str =@"";
            if (UIImagePNGRepresentation(image)) {
                mineType = @"image/png";
                str = @"png";
            }else {
                mineType = @"image/jpeg";
                str = @"jpeg";
            }
            NSData *data = UIImageJPEGRepresentation(image, 0.30);
            [formData appendPartWithFileData:data name:[NSString stringWithFormat:@"file%d",imageCount] fileName:[NSString stringWithFormat:@"icon%d.%@",imageCount,str] mimeType:mineType];
            imageCount++;
        }
    } progress:^(NSProgress * _Nonnull uploadProgress) {

    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        success(responseObject);
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        failure(error);
    }];
}