將PFObject分配給UILabel - 將PFUser轉換爲NSString值？

Question

我已經創建了一個應用程序，以允許用戶上傳附帶說明的圖像。兩者都顯示在滾動視圖中。我在圖片下方還有一個UILabel，它應該顯示上傳用戶的詳細信息以及上傳日期。

然而，此刻的UILabel這應該顯示用戶信息和日期不會做，在我想要的格式（例如「上傳者：用戶名，日期」），而不是我得到以下..

下面是用戶上傳圖片時使用的PFObject代碼;

PFObject *imageObject = [PFObject objectWithClassName:@"ReportImageObject"]; 
     [imageObject setObject:file forKey:@"image"]; 
     [imageObject setObject:[PFUser currentUser] forKey:@"user"]; 
     [imageObject setObject:self.descriptionTextField.text forKey:@"comment"]; 

而下面是我在哪裏分配一個UILabel PFObject的值;

NSDate *creationDate = reportObject.createdAt; 
NSDateFormatter *df = [[NSDateFormatter alloc] init]; 
    [df setDateFormat:@"HH:mm dd/MM yyyy"]; 

UILabel *infoLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 210, reportImageView.frame.size.width, 15)]; 
infoLabel.text = [NSString stringWithFormat:@"Uploaded by: %@, %@", [reportObject objectForKey:KEY_USER], [df stringFromDate:creationDate]]; 
infoLabel.font = [UIFont fontWithName:@"Arial-ItalicMT" size:9]; 
infoLabel.textColor = [UIColor blueColor]; 
infoLabel.backgroundColor = [UIColor clearColor]; 
[reportImageView addSubview:infoLabel]; 

術語KEY_USER被定義爲@"user"

這讓我困惑的是，我的其他標籤的東西（圖片說明 - 可以隱約看到上傳的圖片左上角「測試3」）訪問descriptionFieldText.text顯示的內容正是用戶輸入的內容？即使當我檢查NSLog與PFObject objectForKey相關聯，它顯示一個類似的格式與不受歡迎的UILabel，但實際的標籤訪問所需的值？正在使用

正在顯示上傳的圖像視圖控制器

修訂 主要方法 - 其中所述的UILabel正在顯示

-(void)getReportImages{ 
//Fetch images 
PFQuery *query = [PFQuery queryWithClassName:@"ReportImageObject"]; 

[query orderByDescending:KEY_CREATION_DATE]; 
[query findObjectsInBackgroundWithBlock:^(NSArray * _Nullable objects, NSError * _Nullable error) { 
    if (!error) { 
     self.reportsObjectArray = nil; 
     self.reportsObjectArray = [[NSArray alloc] initWithArray:objects]; 
     [self loadReportViews]; 
    } else { 
     [self showErrorView:error]; 
    } 
}]; 
} 

-(void)loadReportViews{ 
for (id viewToRemove in [self.reportsScroll subviews]) { 
    if ([viewToRemove isMemberOfClass:[UIView class]]) 
     [viewToRemove removeFromSuperview]; 
} 

int originY = 10; 

for (PFObject *reportObject in self.reportsObjectArray){ 
    UIView *reportImageView = [[UIView alloc] initWithFrame:CGRectMake(10, originY, self.view.frame.size.width -20, 300)]; 

    //Adds image 
    PFFile *image = (PFFile*)[reportObject objectForKey:KEY_IMAGE]; 
    UIImageView *userImage = [[UIImageView alloc] initWithImage:[UIImage imageWithData:image.getData]]; 
    userImage.frame = CGRectMake(0, 0, reportImageView.frame.size.width, 200); 
    [reportImageView addSubview:userImage]; 

    //Adds image info 
    NSDate *creationDate = reportObject.createdAt; 
    NSDateFormatter *df = [[NSDateFormatter alloc] init]; 
    [df setDateFormat:@"HH:mm dd/MM yyyy"]; 

    UILabel *infoLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 210, reportImageView.frame.size.width, 15)]; 
    infoLabel.text = [NSString stringWithFormat:@"Uploaded by: %@, %@", [reportObject objectForKey:KEY_USER], [df stringFromDate:creationDate]]; 
    infoLabel.font = [UIFont fontWithName:@"Arial-ItalicMT" size:9]; 
    infoLabel.textColor = [UIColor blueColor]; 
    infoLabel.backgroundColor = [UIColor clearColor]; 
    [reportImageView addSubview:infoLabel]; 

    //Adds image description 
    UILabel *descriptionLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 24, reportImageView.frame.size.width, 15)]; 
    descriptionLabel.text = [reportObject objectForKey:KEY_COMMENT]; 
    descriptionLabel.font = [UIFont fontWithName:@"ArialMT" size:13]; 
    descriptionLabel.textColor = [UIColor whiteColor]; 
    descriptionLabel.backgroundColor = [UIColor clearColor]; 
    [reportImageView addSubview:descriptionLabel]; 

    [self.reportsScroll addSubview:reportImageView]; 

    originY = originY + reportImageView.frame.size.width + 20; 

    NSLog(@"Test of description%@",descriptionLabel); 
    NSLog(@"The content of infolabel %@", infoLabel); 
} 

self.reportsScroll.contentSize = CGSizeMake(self.reportsScroll.frame.size.width, originY); 
} 

的UIViewController其中用戶受讓人圖片和圖片描述 也是在imageObject正在創建

- (void)sendPressed:(id)sender{ 
[self.descriptionTextField resignFirstResponder]; 

self.navigationItem.rightBarButtonItem.enabled = NO; 

UIActivityIndicatorView *loadingSpinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge]; 

[loadingSpinner setCenter:CGPointMake(self.view.frame.size.width/2.0, self.view.frame.size.height/2.0)]; 
[loadingSpinner startAnimating]; 

[self.view addSubview:loadingSpinner]; 

//Upload a new picture if not currently uploaded. 
NSData *pictureData = UIImagePNGRepresentation(self.imageToUpload.image); 

PFFile *file = [PFFile fileWithName:@"image" data:pictureData]; 
[file saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) { 
    if (succeeded) { 
     PFObject *imageObject = [PFObject objectWithClassName:@"ReportImageObject"]; 
     [imageObject setObject:file forKey:@"image"]; 
     [imageObject setObject:[PFUser currentUser] forKey:@"user"]; 
     [imageObject setObject:self.descriptionTextField.text forKey:@"comment"]; 

     [imageObject saveInBackgroundWithBlock:^(BOOL succeeded, NSError * _Nullable error) { 
      if (succeeded) { 
       [self.navigationController popViewControllerAnimated:YES]; 
      } 
      else { 
       NSString *errorString = [[error userInfo] objectForKey:@"error"]; 
       UIAlertController *errorAlertView = [UIAlertController alertControllerWithTitle:@"Error" message:errorString preferredStyle:UIAlertControllerStyleAlert]; 
       [errorAlertView addAction:[UIAlertAction actionWithTitle:@"Ok" style:UIAlertActionStyleDefault handler:nil]]; 
       [self presentViewController:errorAlertView animated:YES completion:nil]; 
      } 
     }]; 
    } 
    else{ 
     NSString *errorString = [[error userInfo] objectForKey:@"error"]; 
     UIAlertController *errorAlertView = [UIAlertController alertControllerWithTitle:@"Error" message:errorString preferredStyle:UIAlertControllerStyleAlert]; 
     [errorAlertView addAction:[UIAlertAction actionWithTitle:@"Ok" style:UIAlertActionStyleDefault handler:nil]]; 
     [self presentViewController:errorAlertView animated:YES completion:nil]; 
    } 
}progressBlock:^(int percentDone) { 
    NSLog(@"Uploaded: %d %%", percentDone); 
}]; 
} 

Answer 1

只需使用而不是整個用戶對象的用戶名

PFUser *user = (PFUser*)[reportObject objectForKey:KEY_USER]; 

UILabel *infoLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 210, reportImageView.frame.size.width, 15)]; 
infoLabel.text = [NSString stringWithFormat:@"Uploaded by: %@, %@", user.username, [df stringFromDate:creationDate]]; 
infoLabel.font = [UIFont fontWithName:@"Arial-ItalicMT" size:9]; 
infoLabel.textColor = [UIColor blueColor]; 
infoLabel.backgroundColor = [UIColor clearColor]; 
[reportImageView addSubview:infoLabel]; 

PFObject *imageObject = [PFObject objectWithClassName:@"ReportImageObject"]; 
imageObject[@"image"] = file; 
imageObject[@"user"] = [PFUser currentUser]; 
imageObject[@"comment"] = self.descriptionTextField.text;