iOS 切换键盘

1.点击toolbar的加号按钮切换键盘

　　　　　　　切换前  　　　　　　　　　　　　　　　切换后

      

2 要实现上述效果

2.1 需要监听键盘的弹出隐藏

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil]; 

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

/**
 *  键盘即将隐藏
 */
- (void)keyboardWillHide:(NSNotification *)note
{
    // 1.键盘弹出需要的时间
    CGFloat duration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    // 2.动画
    [UIView animateWithDuration:duration animations:^{
        self.toolbar.transform = CGAffineTransformIdentity;
    }];
}

/**
 *  键盘即将弹出
 */
- (void)keyboardWillShow:(NSNotification *)note
{
    // 1.键盘弹出需要的时间
    CGFloat duration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    // 2.动画
    [UIView animateWithDuration:duration animations:^{
        // 取出键盘高度
        CGRect keyboardF = [note.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
        CGFloat keyboardH = keyboardF.size.height;
        self.toolbar.transform = CGAffineTransformMakeTranslation(0, - keyboardH);
    }];
}

2.2 toolbar的懒加载方法

- (UIToolbar *)toolbar{
    if (_toolbar == nil) {
        _toolbar = [[UIToolbar alloc]init];
        _toolbar.frame = CGRectMake(0, screenHeight - kToolbarHeight , screenWidth, kToolbarHeight);
        [self.view addSubview:_toolbar];
        
        // 切换键盘的按钮
        UIButton *changeKeybord = [UIButton buttonWithType:UIButtonTypeContactAdd];
        [_toolbar addSubview:changeKeybord];

        [changeKeybord addTarget:self action:@selector(changeKeybord) forControlEvents:UIControlEventTouchDown];
    }
    return _toolbar;
}

2.3 实现changeKeybord方法

- (void)changeKeybord
{
    if (self.mytext.inputView) { //inputView存在则说明是自定义键盘
        self.mytext.inputView = nil; //把自定义键盘清空,则就变回系统键盘
    }else{ //反之,inputView不存在,则说明当前显示的是系统键盘
        UIView *newKeybord = [[UIView alloc]init];  // 实例化一个新键盘
        newKeybord.bounds = CGRectMake(0, 0, 320, 216);
        newKeybord.backgroundColor = [UIColor yellowColor];
        self.mytext.inputView = newKeybord; //将新键盘赋值给inputView
    }

    // 下面这句不能省,因为切换键盘后,只有先隐藏再弹出,才会调出新键盘
    [self.mytext resignFirstResponder];
    // 为了让键盘切换交互效果更顺畅,增加延迟,如果不增加延迟,会出现:旧键盘还没完全隐藏,新键盘就已经弹出了
    dispatch_after((uint64_t)3.0, dispatch_get_main_queue(), ^{
        [self.mytext becomeFirstResponder];
    });
    
}

2.4 自定义一个新键盘

未完待续