Question

I am creating one application in iOs 5 using story board and in that application I need to use one NSMutableArray for table View.
so I am creating that array as shown below.
but in iOs 4 we creating array like

@interface MySpots : UITableViewController{
       NSMutableArray *MySpots;
}
@property (nonatomic, strong) NSMutableArray *MySpots;

and in .m file

@synthesize MySpots;
- (void)viewDidLoad

{
     [super viewDidLoad];
      MySpots = [[NSMutableArray alloc]init];
      for (int i = 0; i<10; i++) {
          mySpot.SpotName = @"Name Of Spot";
          mySpot.SpotTime = @"15mi";
          mySpot.SpotDis = @"Short preview of the description will appear in this section.Acts as a reminder for relevant";
          [MySpots addObject:mySpot];
       }

}

but when i try to do this in iOs 5 it will show me error(“Expected identifier or {” ) on

MySpots = [[NSMutableArray alloc]init];

because in iOs 5 no need to release. so how should i have to declare NSMutableArray in iOs 5 .
thanks in advance 🙂

Answer 1

This has nothing to do with iOS 5 but rather is a compiler error from objective C. The basic problem is that you use MySpots both as interface name and as property/instance variable. When encountering your line

MySpots = [[NSMutableArray alloc]init];

the compiler now is unsure if this is the variable MySpots or should be a declaration of a variable of type MySpots, e.g.

MySpots *mySecondController = ...;

The compiler assumes the second and bails out because of the missing variable name.

You should

1. change that property’s name to something different than the class name to avoid confusion
2. use self.property = instead of property = because this uses the correct memory management. ARC somewhat reduces this problem but it is good practice anyway to use the automatic retain/release provided by properties.

Either one of those would help (in case 1 the compiler now is clear on what to do, in case 2 self.MySpots would be a unique name and could not be mixed up with the class name) but I would definitely do both, rename the property (or class) and use self.property =.

PS: Even with ARC you still initialize as usual by using [[NSMutableArray alloc] init] ARC just inserts the appropriate retain and releases behind the scenes.