自定义键盘

主要思路：自定义键盘就是重新加载textfield的inputView
自定义一个可以从相册或者拍照来上传图片的键盘

第一步：对键盘进行监听
//增加监听，当键盘出现时收出消息
  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
  //增加监听，当键盘退出时收出消息
  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHiden:) name:UIKeyboardWillHideNotification object:nil];
  //增加监听，当键盘改变时收出消息
  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardChange:) name:UIKeyboardWillChangeFrameNotification object:nil];
//初始化一个View，用来放“照片”按钮
specView = [[UIView alloc] initWithFrame:CGRectMake(0, HEIGHT, WIDTH, 30)];
  specView.backgroundColor = [UIColor orangeColor];
  [self.view addSubview:specView];

第二步：
#pragma mark -- 当键盘出现时调用
-(void)keyboardWillShow:(NSNotification *)noti {
  //获取键盘高度
  NSDictionary *userInfo = noti.userInfo;
  NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
  CGRect keyboardRect = [aValue CGRectValue];
  int height = keyboardRect.size.height;
//创建“照片”按钮
UIButton *photoBtn = [UIButton buttonWithType:UIButtonTypeSystem];
  photoBtn.frame = CGRectMake(SP_W(20), 5, SP_W(30), 20);
  [photoBtn setTitle:@"照片" forState:UIControlStateNormal];
  [photoBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
  photoBtn.titleLabel.font = [UIFont systemFontOfSize:13];
  [photoBtn addTarget:self action:@selector(ShowPhoto:) forControlEvents:UIControlEventTouchUpInside];
  [specView addSubview:photoBtn];
//改变specView的位置，在键盘上面
[UIView animateWithDuration:0.1 animations:^{
  specView.frame = CGRectMake(0, HEIGHT - height - 30, WIDTH, 30);
  fabiaoText.frame = CGRectMake(SP_W(10), 665 - height - 50 + 30, WIDTH - SP_W(20), 40);
  }];
}

第三步：
#pragma mark -- 点击“照片”按钮事件
-(void)ShowPhoto:(UIButton *)button {

  if (isPhoto == NO) {
  [self layoutPhotoKeyboard];
//将textfield的inputView设置成自定义的视图
       
textfield.inputView = photoView;
//重新加载inputView
  [textfield reloadInputViews];
  isPhoto = YES;
  }else {
//此时将textfield的inputView设置成nil，键盘会重新换成系统键盘
       
textfield.inputView = nil;
//重新加载inputView
  [textfield reloadInputViews];
  isPhoto = NO;
  }
}

#pragma mark -- 自定义键盘的样式
-(void)layoutPhotoKeyboard {
//背景
  photoView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, WIDTH, 160)];
//相册按钮
  UIButton *xiangceBtn = [UIButton buttonWithType:UIButtonTypeSystem];
  xiangceBtn.frame = CGRectMake(SP_W(10), 10, SP_W(50), SP_W(50));
  [xiangceBtn setTitle:@"相册" forState:UIControlStateNormal];
  [xiangceBtn addTarget:self action:@selector(FromXiangce:) forControlEvents:UIControlEventTouchUpInside];
  [photoView addSubview:xiangceBtn];
//拍照按钮
  UIButton *paizhaoBtn = [UIButton buttonWithType:UIButtonTypeSystem];
  paizhaoBtn.frame = CGRectMake(CGRectGetMaxX(xiangceBtn.frame) + SP_W(20), 10, SP_W(50), SP_W(50));
  [paizhaoBtn setTitle:@"拍照" forState:UIControlStateNormal];
  [paizhaoBtn addTarget:self action:@selector(FromPaiZhao:) forControlEvents:UIControlEventTouchUpInside];
  [photoView addSubview:paizhaoBtn];
}

第四步：分别从相册和拍照获取照片
#pragma mark -- 照片 从相册获取
-(void)FromXiangce:(UIButton *)button {
  //创建对象
  UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
  //（选择类型）表示仅仅从相册中选取照片
  imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
  //指定代理，因此我们要实现UIImagePickerControllerDelegate,
  // UINavigationControllerDelegate协议
  imagePicker.delegate = self;
  //设置在相册选完照片后，是否跳到编辑模式进行图片剪裁。(允许用户编辑)
  imagePicker.allowsEditing = YES;
  //显示相册
  [self presentViewController:imagePicker animated:YES completion:nil];
}

#pragma mark -- 照片 拍照获取
-(void)FromPaiZhao:(UIButton *)button {
  if ([UIImagePickerController isSourceTypeAvailable:
  UIImagePickerControllerSourceTypeCamera]) {
  UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
  imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
  imagePicker.delegate = self;
  imagePicker.allowsEditing = YES; //允许用户编辑
  [self presentViewController:imagePicker animated:YES completion:nil];
  } else {
  //弹出窗口响应点击事件
  UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"警告"
  message:@"未检测到摄像头" delegate:nil cancelButtonTitle:nil
  otherButtonTitles:@"确定", nil, nil];
  [alert show];
  }
}

//图片完成之后处理
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo {

  //image 就是修改后的照片
//将image放到你想要放的地方就行了

  //结束操作
  [self dismissViewControllerAnimated:YES completion:nil];
}

自定义表情键盘和上面的原理一样，只是代码比这个稍微复杂点，稍后整理。。。
效果图：灰色部分是键盘，再点击一次照片，会换成系统键盘