自定义ios keyboard tool bar代码片段

-(UIToolbar *)createActionBar {
    UIToolbar *actionBar = [[UIToolbar alloc] init];
    actionBar.translucent = YES;
    [actionBar sizeToFit];
    actionBar.barStyle = UIBarStyleBlackTranslucent;

    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"Done", @"")
                                                                   style:UIBarButtonItemStyleDone target:self
                                                                  action:@selector(handleActionBarDone:)];

    _prevNext = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects:NSLocalizedString(@"Previous", @""), NSLocalizedString(@"Next", @""), nil]];
    _prevNext.momentary = YES;
    _prevNext.segmentedControlStyle = UISegmentedControlStyleBar;
    _prevNext.tintColor = actionBar.tintColor;
    [_prevNext addTarget:self action:@selector(handleActionBarPreviousNext:) forControlEvents:UIControlEventValueChanged];
    UIBarButtonItem *prevNextWrapper = [[UIBarButtonItem alloc] initWithCustomView:_prevNext];
    UIBarButtonItem *flexible = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
    [actionBar setItems:[NSArray arrayWithObjects:prevNextWrapper, flexible, doneButton, nil]];

	return actionBar;
}



if (_entryElement.hiddenToolbar){
        _textField.inputAccessoryView = nil;
    } else {
        _textField.inputAccessoryView = [self createActionBar];
    }