ToolBar跟随键盘弹出和隐藏

实现效果如下:

 

代码实现如下:

//
//  ViewController.m
//  PopToolBarDemo
//
//  Created by 思 彭 on 2017/7/20.
//  Copyright © 2017年 思 彭. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()<UITextFieldDelegate>

@property (weak, nonatomic) IBOutlet UITextField *myTextField;
@property (nonatomic, strong) UIToolbar *toolBarView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.myTextField.delegate = self;
    
    // 监听键盘的弹出
    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(keyBoardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];
    
    CGSize size = self.view.frame.size;
    // 创建一个工具条，并设置它的大小和位置
    UIToolbar* toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, [UIScreen mainScreen].bounds.size.height, size.width, 46)];
    self.toolBarView = toolbar;
    // 设置工具条的style
    [toolbar setBarStyle:UIBarStyleDefault];
    
    // 创建使用文本标题的UIBarButtonItem
//    UIBarButtonItem* leftItem = [[UIBarButtonItem alloc] initWithTitle:@"左边" style:UIBarButtonSystemItemFlexibleSpace target:self action:@selector(onClick:)];
    
    UIBarButtonItem *spaceItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:@selector(onClick:)];
    [spaceItem setTag:1];
    
    // 创建使用自定义图片的UIBarButtonItem
    UIBarButtonItem* centerItem = [[UIBarButtonItem alloc]
                                   initWithImage:[[UIImage imageNamed:@"exam_stopwatch_icon"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal ]
                                   style:UIBarButtonItemStylePlain
                                   target:self
                                   action:@selector(onClick:)];
    [centerItem setTag:2];
    // 创建使用系统图标的UIBarButtonItem
    UIBarButtonItem* rightItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSearch target:self action:@selector(onClick:)];
    [rightItem setTag:3];
    // 为工具条设置工具按钮  注意设置间距
    NSArray* barButtonItems = [NSArray arrayWithObjects:spaceItem, centerItem, spaceItem, rightItem,spaceItem,  nil];
    
    [toolbar setItems:barButtonItems animated:YES];
    // 将工具条添加到当前应用的界面中
    [self.view addSubview:toolbar];
}

- (void)onClick: (UIBarButtonItem *)item {
    NSInteger tag = [item tag];
    switch (tag) {
        case 2:
            NSLog(@"第一个");
            break;
        case 3:
            NSLog(@"第二个");
            break;
        default:
            break;
    }
}

- (void)textFieldDidEndEditing:(UITextField *)textField {
    NSLog(@"textField.text = %@",textField.text);
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    [self.myTextField resignFirstResponder];
    return YES;
}

- (void)keyBoardWillChangeFrame:(NSNotification*)notification{
    
    // 键盘显示\隐藏完毕的frame
    CGRect frame = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
    
    // 动画时间
    CGFloat duration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    
    if (frame.origin.y == [UIScreen mainScreen].bounds.size.height) {
        // 没有弹出键盘
        [UIView animateWithDuration:duration animations:^{
            
            self.toolBarView.transform = CGAffineTransformIdentity;
            
        }];
    } else{ // 弹出键盘
        
        // 工具条往上移动258
        [UIView animateWithDuration:duration animations:^{
            
            self.toolBarView.transform = CGAffineTransformMakeTranslation(0, -frame.size.height-44);
        }];
    }
}

@end