Add a ToolBar Done Button for Picker - ios

Question

I am trying to add a done button on the top of the picker as follows. But unfortonately, I could not able to see done button.
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc]
initWithTitle:#"Done" style:UIBarButtonItemStyleDone
target:self action:#selector(done)];
UIToolbar *toolBar = [[UIToolbar alloc]initWithFrame:
CGRectMake(0, self.view.frame.size.height-
picker.frame.size.height-250, self.view.frame.size.width, 50)];
[toolBar setBarStyle:UIBarStyleBlackOpaque];
NSArray *toolbarItems = [NSArray arrayWithObjects:
doneButton, nil];
[toolBar setItems:toolbarItems];
categoryTF.inputView = picker;

Answer 1

You forgot to add your toolBar into a view. You can do that as follows:
[self.view addSubview:toolBar];

Answer 2

add this line:
categoryTF.inputAccessoryView = toolBar;

Answer 3

Use toolbar and done button for pickerView
CGRect pickerFrame = CGRectMake(0,kSCREEN_HEIGHT-200,kSCREEN_WIDTH,200);
UIPickerView * pickerview = [[UIPickerView alloc] initWithFrame:pickerFrame];
pickerview.delegate = self;
pickerview.dataSource = self;
textField.inputView=pickerview;
UIToolbar *myToolbar=[[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, kSCREEN_WIDTH, 56)];
myToolbar.barStyle=UIBarStyleBlack;
[myToolbar sizeToFit];
myToolbar.backgroundColor=[UIColor whiteColor];
NSMutableArray *barItems=[[NSMutableArray alloc]init];
UIBarButtonItem *btnItem=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
[barItems addObject:btnItem];
UIBarButtonItem *doneBtn=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:#selector(pickerDoneClicked)];
[barItems addObject:doneBtn];
[myToolbar setItems:barItems animated:YES];
myToolbar.barStyle = UIBarButtonItemStylePlain;
myToolbar.barTintColor = [UIColor colorWithRed:0.94f green:0.94f blue:0.96f alpha:1.0f];
myToolbar.tintColor=[UIColor blackColor];
txtField.inputAccessoryView=myToolbar;
-(void)pickerDoneClicked
{
[txtField resignFirstResponder];
}