完成按钮放在UIToolBar中。

The "Done" button is placed in UIToolBar.

使用以下UIToolBar方法添加完成按钮。

Use the below method of UIToolBar for adding the "Done" buttons.

- (void)setItems:(NSArray *)items animated:(BOOL)animated {

    UIToolbar*  mypickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 56)];
    mypickerToolbar.barStyle = UIBarStyleBlackOpaque;
    [mypickerToolbar sizeToFit];

    NSMutableArray *barItems = [[NSMutableArray alloc] init];

    UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
    [barItems addObject:flexSpace];

    UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(DatePickerDoneClick)];
    [barItems addObject:doneBtn];

    [mypickerToolbar setItems:barItems animated:YES];

}