NSArray sort with custom objects

Question

I have the following class:

typedef enum eItems {
kItem1,
kItem2,
kItem3  
} MyItem;

@interface MyClass: CCSprite<CCTargetedTouchDelegate>{
... 
MyItem mClIt;
...
}

...
- (NSComparisonResult)MyCompareFunc:(MyClass*)inObject
- (MyItem)GetSomeItem;
...

And function for sorting:

- (NSComparisonResult)MyCompareFunc:(MyClass*)inObject
{
 if ([self GetSomeItem] > [inObject GetSomeItem])
    return NSOrderedDescending;
 else if ([self GetSomeItem] < [inObject GetSomeItem])
    return NSOrderedAscending;
 return NSOrderedSame;
}

I create the NSArray of the MyClass objects later in the some class:

@interface Person : Main {
    ....
    NSArray * mObjArr;
    ....
}

And I need to sort the mObjArr with help of MyCompareFunc, using sortUsingSelector:@selector(MyCompareFunc:) method. But I have the following error:

error: accessing unknown 'mObjArr' getter method.

Help please to resolve the problem.

Is there a property declaration corresponding to the mObjArr instance variable? It seems that since you're getting an "unknown getter" method that the calling code is looking for a property that either isn't declared or isn't imported in the implementation file. — warrenm
– warrenm, Commented Jun 28, 2010 at 5:33
It might help to show the part of the code where the error is actually occuring. — Chuck
– Chuck, Commented Jun 28, 2010 at 5:48
Yes, I have no property, thanks. I've added the property for the mObjArr. But I still have the problem. Programm crashes on line: [self.mObjArr sortUsingSelector:@selector(MyCompareFunc:)]; While compiling I have the warning on the line: 'NSArray' may not respond to '-sortUsingSelector:' — ArisRS
– ArisRS, Commented Jun 28, 2010 at 6:23

JWWalker · Accepted Answer · 2010-06-28 06:14:37Z

2

I'm not sure if this is the only problem, but you'd need an NSMutableArray, not NSArray, to use sortUsingSelector:.

answered Jun 28, 2010 at 6:14

JWWalker

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