前言：

項(xiàng)目要把圖床從七牛遷到阿里云。因此，就要使用阿里云的圖床上傳。我去看了阿里云開(kāi)發(fā)文檔給出的示例代碼和git。然而，我覺(jué)得他們給出的代碼不好用，demo寫得也不那么弱智易懂，shit！

上傳圖片有兩種方式，一種是使用三個(gè)key，可以參考這位iOS玩家的文章：
iOS 阿里云圖片上傳

還有一個(gè)是使用 “initWithAuthServerUrl” 這種方式。我這里用的就是這個(gè)方式。

我不想再看見(jiàn)阿里云了。

自己新建一個(gè)類： AliyunOSSUpload，繼承自 NSObject，
然后在 AliyunOSSUpload.m 里面，寫一個(gè)內(nèi)部類：ISAuthCredentialProvider ，繼承自阿里云的 OSSFederationCredentialProvider。

上代碼

.h

#import <Foundation/Foundation.h>
#import <AliyunOSSiOS/AliyunOSSiOS.h>

NS_ASSUME_NONNULL_BEGIN

/// 上傳到阿里云的 EndPoint
static NSString * _Nonnull const OSS_ENDPOINT = @"這個(gè)地址,找自己后臺(tái)要";
/// 上傳到阿里云的 BucketName
static NSString * _Nonnull const BucketName = @"這個(gè),找自己后臺(tái)要";

@interface AliyunOSSUpload : NSObject

+(AliyunOSSUpload *)aliyunInit;

/// 上傳圖片
/// @param imgArray 放入需要上傳的圖片
/// @param success 上傳成功,返回自己拼接的圖片名字
- (void)uploadImage:(NSArray <UIImage *>*)imgArray success:(void (^)(NSArray <NSString *> * nameArray))success;

@end


NS_ASSUME_NONNULL_END

.m

#import "AliyunOSSUpload.h"

/// 在使用 initWithAuthServerUrl 這種方式初始化阿里云的時(shí)候, 傳入的 url 是自己家的url.
/// 但是! 一般自己家的url在做請(qǐng)求的時(shí)候, 往往在請(qǐng)求頭(HTTPHeaderField)里面需要加入?yún)?shù), 比如自己家用戶登錄的時(shí)候拿到的 token, 需要在后續(xù)所有請(qǐng)求頭里加上這個(gè)token,
/// 再就是加入一些其他請(qǐng)求頭參數(shù), 比如, 哪個(gè)端,iOS,Android, 版本號(hào)之類.
/// 所以,我們 新建一個(gè)類, 繼承自 OSSFederationCredentialProvider, 然后把 阿 里 云 代 碼 直 接 拷 貝 過(guò) 來(lái) 改寫.
@interface ISAuthCredentialProvider : OSSFederationCredentialProvider
@property (nonatomic, copy) NSString * authServerUrl;
@property (nonatomic, copy) NSData * (^responseDecoder)(NSData *);
- (instancetype)initWithAuthServerUrl:(NSString *)authServerUrl;
- (instancetype)initWithAuthServerUrl:(NSString *)authServerUrl responseDecoder:(nullable OSSResponseDecoderBlock)decoder;
@end

@implementation ISAuthCredentialProvider

- (instancetype)initWithAuthServerUrl:(NSString *)authServerUrl {
    return [self initWithAuthServerUrl:authServerUrl responseDecoder:nil];
}

- (instancetype)initWithAuthServerUrl:(NSString *)authServerUrl responseDecoder:(nullable OSSResponseDecoderBlock)decoder {
    
    self = [super initWithFederationTokenGetter:^OSSFederationToken * {
        
        NSURL * url = [NSURL URLWithString:authServerUrl];
        
        //把原來(lái)的 NSURLRequest 改成 NSMutableURLRequest, 這樣可以加入新的請(qǐng)求頭參數(shù), 就加入這么點(diǎn)東西,其余的代碼不改.
        NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url];
        
        [request setValue:@"用戶登錄時(shí)候拿到的 token" forHTTPHeaderField:@"你們定義好的 token key"];
        [request setValue:@"其他需要放進(jìn)來(lái)的參數(shù)" forHTTPHeaderField:@"其他的參數(shù) key"];
        
        OSSTaskCompletionSource * tcs = [OSSTaskCompletionSource taskCompletionSource];
        NSURLSession * session = [NSURLSession sharedSession];
        NSURLSessionTask * sessionTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
            if (error) {
                [tcs setError:error];
                return;
            }
            [tcs setResult:data];
        }];
        
        [sessionTask resume];
        [tcs.task waitUntilFinished];
        if (tcs.task.error) {
            return nil;
        } else {
            NSData* data = tcs.task.result;
            if(decoder){
                data = decoder(data);
            }
            NSDictionary * object = [NSJSONSerialization JSONObjectWithData:data
                                                                    options:kNilOptions
                                                                      error:nil];
            int statusCode = [[object objectForKey:@"StatusCode"] intValue];
            if (statusCode == 200) {
                OSSFederationToken * token = [OSSFederationToken new];
                // All the entries below are mandatory.
                token.tAccessKey = [object objectForKey:@"AccessKeyId"];
                token.tSecretKey = [object objectForKey:@"AccessKeySecret"];
                token.tToken = [object objectForKey:@"SecurityToken"];
                token.expirationTimeInGMTFormat = [object objectForKey:@"Expiration"];
                OSSLogDebug(@"token: %@ %@ %@ %@", token.tAccessKey, token.tSecretKey, token.tToken, [object objectForKey:@"Expiration"]);
                return token;
            }else{
                return nil;
            }
            
        }
    }];
    if(self){
        self.authServerUrl = authServerUrl;
    }
    return self;
}

@end



OSSClient * client;

@implementation AliyunOSSUpload

static AliyunOSSUpload *_uploader;

+ (AliyunOSSUpload *)aliyunInit {
    @synchronized(self) {
        if (_uploader == nil) {
            [OSSLog enableLog];
            _uploader = [[AliyunOSSUpload alloc] init];
            NSString *OSS_STSTOKEN_URL = @"這個(gè) AuthServerUrl 找后臺(tái)要";
            id<OSSCredentialProvider> credentialProvider = [[ISAuthCredentialProvider alloc] initWithAuthServerUrl:OSS_STSTOKEN_URL];
            OSSClientConfiguration *cfg = [[OSSClientConfiguration alloc] init];
            client = [[OSSClient alloc] initWithEndpoint:OSS_ENDPOINT credentialProvider:credentialProvider clientConfiguration:cfg];
        }
    }
    return _uploader;
}


- (void)uploadImage:(NSArray <UIImage *>*)imgArray success:(void (^)(NSArray <NSString *> * nameArray))success {
    
    dispatch_group_t group = dispatch_group_create();
    
    //名字?jǐn)?shù)組
    NSMutableArray *nameArray = [NSMutableArray array];
    
    for (int i = 0; i < imgArray.count; i ++) {
        
        dispatch_group_enter(group); //進(jìn)入組

        NSString *s = [NSString stringWithFormat:@"photot_name_%d_%@.jpg",i,[NSUUID UUID].UUIDString];
                
        OSSPutObjectRequest * put = [OSSPutObjectRequest new];
        put.contentType = @"image/jpeg";
        put.bucketName = BucketName;
        put.objectKey = s;
        put.uploadingData = UIImageJPEGRepresentation(imgArray[i], 1);
        put.uploadProgress = ^(int64_t bytesSent, int64_t totalByteSent, int64_t totalBytesExpectedToSend) {
            NSLog(@"%lld, %lld, %lld", bytesSent, totalByteSent, totalBytesExpectedToSend);
        };
        
        OSSTask * putTask = [client putObject:put];
        [putTask continueWithBlock:^id(OSSTask *task) {
            if (!task.error) {
                NSLog(@"圖片上傳成功!"); 
                [nameArray addObject:s];
            } else{
                NSLog(@"圖片上傳失敗: %@" , task.error);
            }
            dispatch_group_leave(group);  //不論是成功或者失敗,都離開(kāi)組
            return nil;
        }];
    }
    
    dispatch_group_notify(group, dispatch_get_main_queue(), ^{
        success(nameArray);
        NSLog(@"任務(wù)全部完成,當(dāng)前線程 %@",[NSThread currentThread]); //收到任務(wù)全部完成的通知
    });
}

@end

調(diào)用

[[AliyunOSSUpload aliyunInit] uploadImage:arrayNewPhoto success:^(NSArray<NSString *> * _Nonnull nameArray) {'
    NSLog(@"%@", nameArray);
}];