Question

I have some values that are stored with core data, and I have opened the application’s sqlite database to make sure that the values are being stored correctly, but when I try to display the values they come out all funky. I store the values from the core data entity in an array then try to call the values. Basically I am new to developing with objective c and think I need some formatting help. Here is the code block displaying the funky numbers on output:

NSDateFormatter* dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeStyle:NSDateFormatterMediumStyle];
NSString *dateString = [dateFormatter stringFromDate:dJournal.dateTime];

cell.dateLabel.text = dateString;
cell.insulinTypeLabel.text = dJournal.insulinType; 
cell.glucoseLevelLabel.text = [NSString stringWithFormat:@"%e",dJournal.glucoseLevel ];
cell.carbTotalLabel.text = [NSString stringWithFormat:@"%d",dJournal.carbTotal ];
cell.insulinAmountLabel.text = [NSString stringWithFormat:@"%E",dJournal.insulinUnits ];

return cell;

Here is the core data generated class file:

@property (nonatomic, retain) NSDate * dateTime;
@property (nonatomic, retain) NSNumber * glucoseLevel; //Double
@property (nonatomic, retain) NSString * insulinType;  //string - no problem with
@property (nonatomic, retain) NSNumber * insulinUnits; //Double
@property (nonatomic, retain) NSNumber * carbTotal; //Integer64

I also have tried:

[[NSNumber numberWithInt:carbTotal] stringValue]

no luck. Thanks in advance for any help.

Answer 1

Why are you using %e, %d etc? If you want to print out objective-C objects you need to use the %@ format specifier, e.g.

cell.glucoseLevelLabel.text = [NSString stringWithFormat:@"%@", dJournal.glucoseLevel];

If you are displaying numbers however, you should actually be using an instance of NSNumberFormatter to generate locale-aware strings.