Ios 正在下载用于在本地通知上显示的图像不工作

我正在开发一个框架，该框架具有从FCM接收消息并将其转换为本地通知的功能，在我收到的其中一个键中有一个指向图像的URL。因此，在苹果的文档中做了一些研究，发现图像应该存储在设备中（我使用的是模拟器），然后可以使用它，因此，我实现了一种下载随机图像（.png）的方法。该方法工作正常，我对其进行了测试，并且图像位于指定位置，问题是，当调用

attachmentWithIdentifier:identifier URL:options:error:

method时，从NSError*指针打印userInfo字典时，我得到了这个结果

{NSLocalizedDescription = "Invalid attachment file URL";}

我附上我的代码：

UNUserNotificationCenter * center = [UNUserNotificationCenter currentNotificationCenter];
if (settings.alertSetting == UNNotificationSettingEnabled)
{

    NSDictionary * remoteMessageData = [remoteMessage appData];

    NSString * imageHttpUrl = [remoteMessageData objectForKey:@"im"];

    NSURL * imageURL = [self getStorageFilePath:imageHttpUrl];

    [self downloadImageFromURL:imageHttpUrl withFullPath:imageURL.absoluteString withCompletitionHandler:^(NSHTTPURLResponse *httpResponse) {

        UNMutableNotificationContent * content = [[UNMutableNotificationContent alloc] init];

            content.title = [remoteMessageData objectForKey:@"ti"];
            content.body = [remoteMessageData objectForKey:@"bd"];

        if(httpResponse != nil)
        {
            if (httpResponse.statusCode == 200)
            {
                NSString * identifier = @"ImageIdentifier";
                NSArray<UNNotificationAttachment*> * attachments = [NSArray arrayWithObjects:[self getAttachments:imageURL withIdentifier:identifier], nil] ;
                content.attachments = attachments;
            }

        }

        content.userInfo = remoteMessageData;

        UNTimeIntervalNotificationTrigger * trigger = [UNTimeIntervalNotificationTrigger triggerWithTimeInterval:10 repeats:NO];

        //Create and register a request notification
        NSString * uuidString = [[NSUUID UUID] UUIDString];

        UNNotificationRequest * request = [UNNotificationRequest requestWithIdentifier:uuidString content:content trigger:trigger];


        [center addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error) {
            //Handle error
            if(error != nil)
            {
                NSLog(@"Dictionary: %@",[error userInfo]);
            }
        }];



- (NSURL *) getStorageFilePath : (NSString *)imageStringURL{

if(imageStringURL == nil)
{
    return nil;
}

NSURL * imageURL = [NSURL URLWithString:imageStringURL];

NSString * fileName = [imageURL lastPathComponent];

NSLog(@"fileName %@",fileName);

NSArray * systemPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSLog(@"systemPaths %@",systemPaths);

NSString * tempDirectoryStringPath = [[[NSURL URLWithString:[systemPaths objectAtIndex:0]] absoluteString] stringByAppendingString:@"/"];

NSString * fullPath = [tempDirectoryStringPath stringByAppendingString:fileName];

NSLog(@"Full PATH: %@",fullPath);

return [NSURL URLWithString:fullPath];}

-(void) downloadImageFromURL : (NSString *)httpURL withFullPath:(NSString * )fullPath withCompletitionHandler:(void (^) (NSHTTPURLResponse * httpResponse) )taskResult{

if(httpURL == nil || fullPath == nil )
{
    taskResult(nil);
    return;
}

NSString *strImgURLAsString = httpURL;

strImgURLAsString = [strImgURLAsString stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];

NSURL * imgURL = [NSURL URLWithString:strImgURLAsString];

NSLog(@"Full PATH inside downloading: %@",fullPath);

NSURLSessionDataTask * downloadPhotoTask = [[NSURLSession sharedSession] dataTaskWithURL:imgURL completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {

    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;

    if (httpResponse.statusCode == 200)
    {
        [data writeToFile:fullPath atomically:YES];



        NSLog(@"Download run successfully");


    }else{
        NSLog(@"Download could not be completed");


    }

    taskResult(httpResponse);

} ];

[downloadPhotoTask resume];


  }

- (UNNotificationAttachment *) getAttachments: (NSURL *)attachmentURL withIdentifier : (NSString*)identifier
{

    NSError * error;

    UNNotificationAttachment * icon =  [UNNotificationAttachment attachmentWithIdentifier:identifier URL: attachmentURL options:nil error:&error];

    NSLog(@"Icon is : %@",[error userInfo]);

    UNNotificationAttachment* attachments = icon;

    return (attachments);
}

UNUserNotificationCenter*center=[UNUserNotificationCenter currentNotificationCenter]；
if（settings.alertSetting==UNNotificationSettingEnabled）
{
NSDictionary*remoteMessageData=[remoteMessage appData]；
NSString*imageHttpUrl=[remoteMessageData objectForKey:@“im”]；
NSURL*imageURL=[self-getStorageFilePath:imageHttpUrl]；
[自下载ImageFromUrl:imageHttpUrl with FullPath:imageURL.absoluteString with CompletionHandler:^（NSHTTPPURLResponse*httpResponse）{
UNMutableNotificationContent*内容=[[UNMutableNotificationContent alloc]init]；
content.title=[remoteMessageData objectForKey:@“ti”]；
content.body=[remoteMessageData objectForKey:@“bd”]；
if（httpResponse！=nil）
{
如果（httpResponse.statusCode==200）
{
NSString*标识符=@“ImageIdentifier”；
NSArray*attachments=[NSArray arrayWithObjects:[self-getAttachments:imageURL with identifier:identifier]，nil]；
content.attachments=附件；
}
}
content.userInfo=remoteMessageData；
UNTimeIntervalNotificationTrigger*trigger=[UntimeIntervalNotificationTriggerWithTimeInterval:10次重复：否]；
//创建并注册请求通知
NSString*uuidString=[[NSUID UUID]uuidString]；
UNNotificationRequest*request=[UnnotificationRequestRequestWithIdentifier:UUIString内容：内容触发器：触发器]；
[center addNotificationRequest:request withCompletionHandler:^（N错误*_可为空错误）{
//处理错误
如果（错误！=nil）
{
NSLog（@“Dictionary:%@，[error userInfo]）；
}
}];
-（NSURL*）getStorageFilePath:（NSString*）imageStringURL{
if（imageStringURL==nil）
{
返回零；
}
NSURL*imageURL=[NSURL URLWithString:imageStringURL]；
NSString*文件名=[imageURL lastPathComponent]；
NSLog（@“fileName%@”，fileName）；
NSArray*systemPaths=NSSearchPathForDirectoriesInDomains（NSDocumentDirectory，NSUserDomainMask，是）；
NSLog（@“系统路径%@”，系统路径）；
NSString*tempDirectoryStringPath=[[NSURL URLWithString:[systemPaths objectAtIndex:0]]absoluteString]stringByAppendingString:@/“]；
NSString*fullPath=[tempDirectoryStringPath stringByAppendingString:fileName]；
NSLog（@“完整路径：%@”，完整路径）；
返回[nsurlUrlWithString:fullPath]；}
-（void）下载ImagefromURL:（NSString*）带完整路径的httpURL:（NSString*）带完整路径处理程序的完整路径：（void（^）（NSHTTPURLResponse*httpResponse））任务结果{
if（httpURL==nil | | fullPath==nil）
{
任务结果（无）；
返回；
}
NSString*strImgURLAsString=httpURL；
strImgURLAsString=[strImgURLAsString stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet-URLQueryAllowedCharacterSet]]；
NSURL*imgURL=[NSURL URLWithString:strImgURLAsString]；
NSLog（@“下载内的完整路径：%@”，完整路径）；
NSURLSessionDataTask*downloadPhotoTask=[[NSURLSession sharedSession]dataTaskWithURL:imgURL completionHandler:^（NSData*\u可为空数据，NSURLRResponse*\u可为空响应，NSError*\u可为空错误）{
NSHTTPURLResponse*httpResponse=（NSHTTPURLResponse*）响应；
如果（httpResponse.statusCode==200）
{
[数据写入文件：完整路径原子：是]；
NSLog（@“下载运行成功”）；
}否则{
NSLog（@“下载无法完成”）；
}
任务结果（httpResponse）；
} ];
[下载照片任务恢复]；
}
-（UNNotificationAttachment*）getAttachments:（NSURL*）attachmentURL with identifier:（NSString*）identifier
{
n错误*错误；
UNNotificationAttachment*图标=[UNNotificationAttachment attachmentWithIdentifier:identifier URL:attachmentURL选项：无错误：&错误]；
NSLog（@“图标为：%@，[error userInfo]）；
未通知附件*附件=图标；
报税表（附件）；
}

我可以让它工作。我使用的是[NSURL URLWithString:fullPath]NSURL，但我应该使用[NSURL fileURLWithPath:fullPath]，但在方法downloadImageFromURL中，继续使用字符串URL，而不使用fileURLWithPath:method格式（这会导致图像无法下载）