自訂ios keyboard tool bar程式碼片段

-(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];    }