OSSImageUploader

图片上传的基本思路：

1、选择图片

2、将图片保存在本地，同时返回图片路径、并生成缩略图用于 UI 显示。

3、上传图片，成功后将步骤 2 中的图片名传给服务器。

单张图片上传的例子官方的 demo 中已经有了，这里直接上多图上传。

具体实现是结合 NSOperationQueue，设置 operation 间的依赖来实现多图上传。

这里省略步骤 1、2 ，直接上传图片：

+ (void)uploadImages:(NSArray<UIImage *> *)images isAsync:(BOOL)isAsync complete:(void(^)(NSArray<NSString *> *names, UploadImageState state))complete
{
    id<OSSCredentialProvider> credential = [[OSSPlainTextAKSKPairCredentialProvider alloc] initWithPlainTextAccessKey:AccessKey                                                                                                            secretKey:SecretKey];
    
    OSSClient *client = [[OSSClient alloc] initWithEndpoint:AliYunHost credentialProvider:credential];
    
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    queue.maxConcurrentOperationCount = images.count;
    
    NSMutableArray *callBackNames = [NSMutableArray array];
    int i = 0;
    for (UIImage *image in images) {
        if (image) {
            NSBlockOperation *operation = [NSBlockOperation blockOperationWithBlock:^{
                //任务执行
                OSSPutObjectRequest * put = [OSSPutObjectRequest new];
                put.bucketName = BucketName;
                NSString *imageName = [kTempFolder stringByAppendingPathComponent:[[NSUUID UUID].UUIDString stringByAppendingString:@".jpg"]];
                put.objectKey = imageName;
                [callBackNames addObject:imageName];
                NSData *data = UIImageJPEGRepresentation(image, 0.3);
                put.uploadingData = data;
                
                OSSTask * putTask = [client putObject:put];
                [putTask waitUntilFinished]; // 阻塞直到上传完成
                if (!putTask.error) {
                    NSLog(@"upload object success!");
                } else {
                    NSLog(@"upload object failed, error: %@" , putTask.error);
                }
                if (isAsync) {
                    if (image == images.lastObject) {
                        NSLog(@"upload object finished!");
                        if (complete) {
                            complete([NSArray arrayWithArray:callBackNames] ,UploadImageSuccess);
                        }
                    }
                }
            }];
            if (queue.operations.count != 0) {
                [operation addDependency:queue.operations.lastObject];
            }
            [queue addOperation:operation];
        }
        i++;
    }
    if (!isAsync) {
        [queue waitUntilAllOperationsAreFinished];
        NSLog(@"haha");
        if (complete) {
            if (complete) {
                complete([NSArray arrayWithArray:callBackNames], UploadImageSuccess);
            }
        }
    }
}

根据返回的地址可以 bucketName + aliYunHost + 地址 在浏览器中直接访问了。 例如 bucketName = "my-bucket"; aliYunHost = "http://oss-cn-shenzhen.aliyuncs.com/"; 返回图片地址 = "temp/69058506-679B-432C-AD11-61A34C067235.jpg";

那么可以通过 “my-bucket.oss-cn-shenzhen.aliyuncs.com/temp/69058506-679B-432C-AD11-61A34C067235.jpg” 直接在浏览器中进行访问