Question

I want to check if user is using the latest version of the app. If so, i should color the background of some cells.

This is the code i’m using:

appDelegate.m

NSString *lastVersion = [[NSUserDefaults standardUserDefaults] objectForKey:@"lastVer"];

method where i want to check:

NSString *lastVersion = (NSString *) [[NSUserDefaults standardUserDefaults] objectForKey:@"lastVer"];
NSString *version = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleVersion"];
lastVersion = @"1.3.4";
if(![lastVersion isEqualToString:version]){
    cell.backgroundColor = [UIColor yellowColor]; ; 
    cell.imageView.image = [UIImage imageNamed:@"image.png"];

  } 
  else { 
       cell.imageView.image = nil;
       cell.backgroundColor = [UIColor whiteColor];
  }
}

Am i doing it right? Is my code checking for the latest version or? How can i simulate this behavior in the simulator \ on device?

What i want to do is check if the user is using the latest version of the app, in order to call in another NSUserDefaults key to show the cells of my tableView with a different background color.

EDIT

Code i’m using to change the cells background if the user is using the latest version of my app and if the user has used the app less than three times:

    NSString *cellValue = cell.textLabel.text;
    NSNumber *runNumber = (NSNumber *)[[NSUserDefaults standardUserDefaults] objectForKey:@"runNum"]; 
    NSString *lastVersion = [[NSUserDefaults standardUserDefaults] objectForKey:@"lastVer"];
    NSString *version = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleVersion"];

    if (!runNumber) { 
                runNumber = [NSNumber numberWithInt:0]; 
                [[NSUserDefaults standardUserDefaults] setObject:runNumber forKey:@"runNum"]; 
                [[NSUserDefaults standardUserDefaults] synchronize]; 
            } 

    if([lastVersion isEqualToString:version]){ //check if the user is using the latest version
       if ([runNumber intValue] < 4) { //check if user has used the app less than 3 times 
           if ([cellValue isEqual: "someText"] ){ 
               cell.backgroundColor = [UIColor yellowColor]; ; 
               cell.imageView.image = [UIImage imageNamed:@"image.png"];
              } 
            else { 
            cell.imageView.image = nil;
            cell.backgroundColor = [UIColor whiteColor];
            } 
        }   
        else {
           cell.imageView.image = nil;
           cell.backgroundColor = [UIColor whiteColor]; 
        }
 }
}

Answer 1

this code will not set anything..

NSString *lastVersion = [[NSUserDefaults standardUserDefaults] objectForKey:@"lastVer"];
lastVersion = @"1.3.4";

you need a setter:

[[NSUserDefaults standardUserDefaults] setObject: @"1.3.4" forKey:@"lastVer"];//in memory
[[NSUserDefaults standardUserDefaults] synchronize];//to disk

and a getter:

NSString *lastVersion = [[NSUserDefaults standardUserDefaults] objectForKey:@"lastVer"];

edit:

remember that lastVersion is a pointer and you just set it to point somewhere else, that doesn’t set it in stdUserDefaults and it doesn’t synchronize it to disk.