UIPickerView *picker = [[[UIPickerView alloc] init] retain];
[picker sizeToFit];
picker.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
picker.delegate = self;
picker.dataSource = self;
picker.showsSelectionIndicator = YES;

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
  if (component == 0) return [array1 count];
  if (component == 1) {
    NSLog(@"selectedRowInComponent:%i",[pickerView selectedRowInComponent:1]); //CRASHES HERE
    return [[array2 objectAtIndex:[pickerView selectedRowInComponent:1]] count];
  }
}

*** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 1 beyond bounds [0 .. 0]'