經歷了一個新的專案,也是一個新的團隊.圖片上傳,成了重點.

1.圖片上傳伺服器之後,在獲取的時候被旋轉了90度.

    解決辦法為:將回調的image物件進行如下處理,

if (image.imageOrientation != UIImageOrientationUp)
    {
        UIGraphicsBeginImageContextWithOptions(image.size, NO, image.scale);
        [image drawInRect:(CGRect){0,0,image.size}];
        UIImage * normalizedImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        image = normalizedImage;
    }
 

2.有的照片在沒有完全從icould下載完成的時候,代理方法獲取到的image為nil.或者選取圖片的代理方法不走.

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(nullable NSDictionary<NSString *,id> *)editingInfo NS_DEPRECATED_IOS(2_0, 3_0);
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info;
 

第一個代理方法選取的照片為沒有完全從icould下載完成,那麼這個代理方法是不執行的.(上傳後臺可能不被旋轉)

第二個代理方法獲取圖片方法如下,這個代理方法執行,但是獲取到的image物件是空的,這需要我們用程式碼是去判斷,不然對image進行操作的話,容易因為image為nil造成崩潰.(上傳後臺可能被旋轉)

 UIImage *image = info[UIImagePickerControllerOriginalImage];

3.多圖上傳.

這個需要後臺的配合,oc程式碼實現如下

+ (void)post:(NSString *)url target:(UIViewController *)target params:(NSDictionary *)params fileDatas:(NSArray *)fileDatas name:(NSString *)name fileNames:(NSArray *)fileNames mimeTypes:(NSArray *)mineTypes success:(void (^)(id json))success failure:(void (^)(NSError *error))failure
{
    [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];
    if (target)
    {
        [MBProgressHUD showHUDAddedTo:target.view animated:YES];
    }
    // 1.建立一個管理者
    AFHTTPSessionManager *session = [AFHTTPSessionManager manager];
    session.requestSerializer.timeoutInterval = 10;
    session.responseSerializer = [AFHTTPResponseSerializer serializer];
    session.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json",@"text/html",@"image/png", @"text/plain",nil];//,@"text/plain"
    // 2.傳送請求
    NSDictionary * dic = [BaseHttp encryptionDictionary:params withEnp:YES];
    JMLog(@"%@",dic);
    [session POST:url parameters:dic constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData)
    {
        // 在傳送請求之前會自動呼叫這個block
        // 需要在這個block中新增檔案引數到formData中
        if (fileDatas.count == fileNames.count && fileNames.count == mineTypes.count)
        {
            for (int i = 0; i < fileDatas.count; i++)
            {
                [formData appendPartWithFileData:fileDatas[i] name:[NSString stringWithFormat:@"%@%d",name,i] fileName:fileNames[i] mimeType:mineTypes[i]];
            }
        }
    } progress:^(NSProgress * _Nonnull uploadProgress)
    {
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject)
    {
        [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
        if (target)
        {
            [MBProgressHUD hideHUDForView:target.view];
        }
        if (success)
        {
            success([BaseHttp decodingData:responseObject]);
        }
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error)
    {
        [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
        if (target)
        {
            [MBProgressHUD hideHUDForView:target.view];
 

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info;

呼叫示例:這個方法要求傳入的不是iamge物件.是UIImageJPEGRepresentation方法轉換之後的圖片

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event

{

    NSDictionary * params = @{@"type":@"3"};
    NSArray * array = @[UIImageJPEGRepresentation([UIImage imageNamed:@"card_placeholder_1"], 0.5),UIImageJPEGRepresentation([UIImage imageNamed:@"card_placeholder_2"], 0.5),UIImageJPEGRepresentation([UIImage imageNamed:@"card_placeholder_3"], 0.5),UIImageJPEGRepresentation([UIImage imageNamed:@"card_placeholder_1"], 0.5),];

    [BaseHttp post:[NSString stringWithFormat:@"%@%@",@"http://img.upload.com",@"/appinlet/test_upload"] params:params fileDatas:array name:@"image" fileNames:@[@"1",@"2",@"3",@"4"] mimeTypes:@[@"image/png",@"image/png",@"image/png",@"image/png"] success:^(id json)
    {
        JMLog(@"%@",json);
    } failure:^(NSError *error)
    {
        JMLog(@"%@",error);
    }];
}

總結:圖片選取應該這麼幹,非空判斷,防止圖片被後臺旋轉

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
{
    UIImage * image = info[UIImagePickerControllerOriginalImage];
    if (!image)
    {
        return;
    }
    if (image.imageOrientation != UIImageOrientationUp)
    {
        UIGraphicsBeginImageContextWithOptions(image.size, NO, image.scale);
        [image drawInRect:(CGRect){0,0,image.size}];
        UIImage * normalizedImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        image = normalizedImage;
    }
    [self dismissViewControllerAnimated:YES completion:nil];
}