Extensions for NSMutableArray

NSMutableArray_Ext.m

- (void) moveObjectAtIndex:(NSUInteger)fromIndex toIndex:(NSUInteger)toIndex{
    if (fromIndex == toIndex) return; 
    if (fromIndex >= self.count) return; 
    if (toIndex >= self.count) toIndex = self.count - 1; //toIndex too large, assume a move to end
    id movingObject = [self objectAtIndex:fromIndex];

    if (fromIndex < toIndex){
        for (int i = fromIndex; i <= toIndex; i++){
            [self replaceObjectAtIndex:i withObject:(i == toIndex) ? movingObject : [self objectAtIndex:i + 1]];
        }
    } else {
        id cObject;
        id prevObject;
        for (int i = toIndex; i <= fromIndex; i++){
            cObject = [self objectAtIndex:i];
            [self replaceObjectAtIndex:i withObject:(i == toIndex) ? movingObject : prevObject];
            prevObject = cObject;
        }
    }
}
- (void) moveObjectAtIndex:(NSUInteger)fromIndex toIndex:(NSUInteger)toIndex withBlock:(void (^)(id object, NSUInteger from, NSUInteger to))block{
    if (fromIndex == toIndex) return;
    if (fromIndex >= self.count) return;
    if (toIndex >= self.count) toIndex = self.count - 1; //toIndex too large, assume a move to end
    id movingObject = [self objectAtIndex:fromIndex];
    id replacementObject;
    
    NSUInteger from;
    if (fromIndex < toIndex){
        for (int i = fromIndex; i <= toIndex; i++){
            from = (i == toIndex) ? fromIndex : i + 1;
            replacementObject = (i == toIndex) ? movingObject : [self objectAtIndex:from];
            [self replaceObjectAtIndex:i withObject:replacementObject];
            if (block) block(replacementObject, from, i);
        }
    } else {
        id cObject;
        id prevObject;
        for (int i = toIndex; i <= fromIndex; i++){
            cObject = [self objectAtIndex:i];
            replacementObject = (i == toIndex) ? movingObject : prevObject;
            from = (i == toIndex) ? fromIndex : i - 1;
            [self replaceObjectAtIndex:i withObject:replacementObject];
            prevObject = cObject;
            if (block) block(replacementObject, from, i);
        }
    }
}
- (void) invertArray{
    NSUInteger operationCount = self.count / 2;
    NSUInteger lastIndex = self.count - 1;
    id tmpObject;
    for (int i = 0; i < operationCount; i++){
        tmpObject = [self objectAtIndex:i];
        [self replaceObjectAtIndex:i withObject:[self objectAtIndex:lastIndex - i]];
        [self replaceObjectAtIndex:lastIndex - i withObject:tmpObject];
    }
}
- (void) invertArrayWithOperationBlock:(void(^)(id object, NSUInteger from, NSUInteger to))block{
    NSUInteger operationCount = self.count / 2;
    NSUInteger lastIndex = self.count - 1;
    id tmpObject1;
    id tmpObject2;
    for (int i = 0; i < operationCount; i++){
        tmpObject1 = [self objectAtIndex:i];
        tmpObject2 = [self objectAtIndex:lastIndex - i];
        [self replaceObjectAtIndex:i withObject:tmpObject2];
        [self replaceObjectAtIndex:lastIndex - i withObject:tmpObject1];
        if (block){
            block(tmpObject1, i, lastIndex - i);
            block(tmpObject2, lastIndex - i, i);
        }
    }
}