ios 给键盘上面加上“完成”

#import <UIKit/UIKit.h>

@interface FirstViewController : UIViewController<UITextFieldDelegate>
{
    UITextField *textField1;
    UITextField *textField2;
    UISegmentedControl *_prevNext;
}
- (UIToolbar *)createActionBar;
@end

//
//  FirstViewController.m
//  MyTableViewDemo
//
//  Created by Chocolate on 13-9-12.
//  Copyright (c) 2013年 Chocolate. All rights reserved.
//

#import "FirstViewController.h"

@interface FirstViewController ()

@end

@implementation FirstViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    textField1 = [[UITextField alloc]initWithFrame:CGRectMake(10, 20, 300, 40)];
    [textField1 setBorderStyle:UITextBorderStyleRoundedRect];
    [textField1 setReturnKeyType:UIReturnKeyNext];
    [textField1 setDelegate:self];
    textField2.inputAccessoryView = [self createActionBar];
    [textField1 setTag:1];
    [textField1 setContentVerticalAlignment:UIControlContentVerticalAlignmentCenter];
    [self.view addSubview:textField1];
    
    textField2 = [[UITextField alloc]initWithFrame:CGRectMake(10, 80, 300, 40)];
    [textField2 setBorderStyle:UITextBorderStyleRoundedRect];
    [textField2 setReturnKeyType:UIReturnKeyDone];
     [textField2 setDelegate:self];
    textField2.inputAccessoryView = [self createActionBar];
    [textField2 setTag:2];
    [textField2 setContentVerticalAlignment:UIControlContentVerticalAlignmentCenter];
    [self.view addSubview:textField2];
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    switch (textField.tag) {
        case 1:
            [textField2 becomeFirstResponder];
            break;
        case 2:
            [textField2 resignFirstResponder];
            break;
        default:
            break;
    }
    return YES;
}

-(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;
}

- (void)handleActionBarPreviousNext:(UISegmentedControl *)control
{
    const BOOL isNext = control.selectedSegmentIndex == 1;
    if (isNext) {
        NSLog(@"next");
    } else {
        NSLog(@"previous");
    }
    [control setSelectedSegmentIndex:UISegmentedControlNoSegment];
}

- (BOOL)handleActionBarDone:(UIBarButtonItem *)doneButton {
        
    return NO;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end