__block NSMutableArray *array = [NSMutableArray array];

@autoreleasepool {
    
    for(int i = 1;i < 100;i++) {
        
        [array addObject:[NSNumber numberWithInteger:i]];
        
    }
    
}

self.pickerView = [[DFPickerView alloc] initWithStyle:DFPickerViewStyleDark]; // DFPickerViewStyleLight
self.pickerView.animationDuration = 0.30f; // defaults to 0.23f
[self.view addSubview:self.pickerView];

[self.pickerView showInView:self.view withAnimations:nil completion:nil objects:array converter:^NSString *(id object) {
    
    return [[object stringValue] stringByAppendingString:@" pcs."];
    
} selection:^(NSInteger selectedIndex, id selectedObject) {
    
    NSLog(@"Selecting object: %@ at index: %i", selectedObject, selectedIndex);
    
} cancel:^{
    
    array = nil;
    self.pickerView = nil;
    
    NSLog(@"Cancelled");
    
} done:^(NSInteger selectedIndex, id selectedObject) {
    
    array = nil;
    self.pickerView = nil;
    
    NSLog(@"Completed with object: %@ at index: %i", selectedObject, selectedIndex);
    
}];