输入框跟随键盘弹出的效果

@interface ViewController ()

@property (weak, nonatomic) IBOutlet UIView *suspendView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    UITapGestureRecognizer *tapgest = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapBackAction)];
    [self.view addGestureRecognizer:tapgest];

}

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


- (void)viewWillAppear:(BOOL)animated {
    // 添加对键盘的监控
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyBoardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyBoardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}

- (void)tapBackAction {
    [self.view endEditing:YES];
}

- (void)keyBoardWillShow:(NSNotification *) note {
    // 获取用户信息
    NSDictionary *userInfo = [NSDictionary dictionaryWithDictionary:note.userInfo];
    // 获取键盘高度
    CGRect keyBoardBounds  = [[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGFloat keyBoardHeight = keyBoardBounds.size.height;
    // 获取键盘动画时间
    CGFloat animationTime  = [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];

    // 定义好动作
    void (^animation)(void) = ^void(void) {
        self.suspendView.transform = CGAffineTransformMakeTranslation(0, - keyBoardHeight);
    };

    if (animationTime > 0) {
        [UIView animateWithDuration:animationTime animations:animation];
    } else {
        animation();
    }

}

- (void)keyBoardWillHide:(NSNotification *) note {
    // 获取用户信息
    NSDictionary *userInfo = [NSDictionary dictionaryWithDictionary:note.userInfo];
    // 获取键盘动画时间
    CGFloat animationTime  = [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];

    // 定义好动作
    void (^animation)(void) = ^void(void) {
        self.suspendView.transform = CGAffineTransformIdentity;
    };

    if (animationTime > 0) {
        [UIView animateWithDuration:animationTime animations:animation];
    } else {
        animation();
    }
}

@end