Question

Here is the code:

TrailLayer * layer = (TrailLayer*)[_layers objectAtIndex:(int)^{
    if (_segmentNumber < [_segmentArray count]) {
        return _segmentNumber;
    } else {
        return _segmentNumber - 1;
    }
}];

what is the problem here? Here, all the _Variables are IVARs. I am first time using Blocks, can someone help me identifying this problem. Its giving EXC_BAD_INSTRUCTION here.

Thanks.

Answer 1

Try this code, First write block to get the index number, and use that number to retrieve value from array

int (^segmentIndex)(int) = ^(int segmentNumber){
        if (segmentNumber < [_layers count]) {
            return segmentNumber;
        } else {
            return segmentNumber - 1;
        }
};


NSLog(@"Trail Layer %@", [_layers objectAtIndex:segmentIndex(_segmentNumber)]);
TrailLayer * layer = (TrailLayer*)[_layers objectAtIndex:segmentIndex(_segmentNumber)];