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];
}