ios - The action of UIBarbuttonItem on UIToolBar not called -

i having trouble action of uibarbuttonitem on uitoolbar not called.
in following code, although donebtn on toolbar tapped, action donebtnaction: not called.
have idea fix it?

- (void)viewdidload {     uipickerview *pickerview = [[uipickerview alloc] init];      uitoolbar *toolbar = [[uitoolbar alloc] initwithframe:cgrectmake(0, -44, 320, 44)];     uibarbuttonitem *donebtn = [[uibarbuttonitem alloc] initwithtitle:@"done" style:uibarbuttonitemstyledone target:self action:@selector(donebtnaction:)];     uibarbuttonitem *flex = [[uibarbuttonitem alloc] initwithbarbuttonsystemitem:uibarbuttonsystemitemflexiblespace target:nil action:nil];     toolbar.items = @[flex, donebtn];     [pickerview addsubview:toolbar];      uitextfield *textfield = [[uitextfield alloc] init];     textfield.inputview = pickerview; }  - (void)donebtnaction:(uibarbuttonitem *)sender {     nslog(@"%@", sender); } 

don't add toolbar subview of picker view, negative y origin (no touches reach toolbar because taps clipped picker view's frame).

instead, make toolbar inputaccessoryview of text field.

textfield.inputaccessoryview = toolbar; 

complete code:

- (void)viewdidload {     uipickerview *pickerview = [[uipickerview alloc] init];      uitoolbar *toolbar = [[uitoolbar alloc] initwithframe:cgrectmake(0, 0, 320, 44)];     uibarbuttonitem *donebtn = [[uibarbuttonitem alloc] initwithtitle:@"done" style:uibarbuttonitemstyledone target:self action:@selector(donebtnaction:)];     uibarbuttonitem *flex = [[uibarbuttonitem alloc] initwithbarbuttonsystemitem:uibarbuttonsystemitemflexiblespace target:nil action:nil];     toolbar.items = @[flex, donebtn];      uitextfield *textfield = [[uitextfield alloc] init];     textfield.inputview = pickerview;     textfield.inputaccessoryview = toolbar; } 

one other note - why not use standard system done type bar button item?