Create an array of integers property in Objective-C
This should work:
@interface MyClass{ int _doubleDigits[10]; }@property(readonly) int *doubleDigits;@end@implementation MyClass- (int *)doubleDigits{ return _doubleDigits;}@end
C arrays are not one of the supported data types for properties. See "The Objective-C Programming Language" in Xcode documentation, in the Declared Properties page:
Supported Types
You can declare a property for any Objective-C class, Core Foundation data type, or “plain old data” (POD) type (see C++ Language Note: POD Types). For constraints on using Core Foundation types, however, see “Core Foundation.”
POD does not include C arrays. See http://www.fnal.gov/docs/working-groups/fpcltf/Pkg/ISOcxx/doc/POD.html
If you need an array, you should use NSArray or NSData.
The workarounds, as I see it, are like using (void *) to circumvent type checking. You can do it, but it makes your code less maintainable.
Like lucius said, it's not possible to have a C array property. Using an NSArray
is the way to go. An array only stores objects, so you'd have to use NSNumber
s to store your ints. With the new literal syntax, initialising it is very easy and straight-forward:
NSArray *doubleDigits = @[ @1, @2, @3, @4, @5, @6, @7, @8, @9, @10 ];
Or:
NSMutableArray *doubleDigits = [NSMutableArray array];for (int n = 1; n <= 10; n++) [doubleDigits addObject:@(n)];
For more information: NSArray Class Reference, NSNumber Class Reference, Literal Syntax