問題1：

由于UITextView作為UIScrollView的子控件，使用常規(guī)的收起鍵盤的方法在這里就會行不通。我嘗試了重寫touchesBegan方法，點擊空白沒響應，因為我實際上點的是scrollView。

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    [self.view endEditing:YES];
} 

解決方案：

在Scroll View 和 Text View之間添加一層View, 將View的class設置為UIControl, 為其Touch Down事件添加相應方法：
- (IBAction)viewTouchDown:(id)sender {
[self.view endEditing:YES];
}

問題2：

顯示鍵盤的時候，鍵盤會遮擋UITextView, 我想要的效果是，顯示鍵盤的時候，可以通過scrollView的滾動條滾動顯示出整個UITextView。

解決方案：

在顯示和隱藏鍵盤的時候添加監(jiān)聽事件，在監(jiān)聽方法中調(diào)整scrollView的Frame。

- (void)viewWillAppear:(BOOL)animated{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyBoardDidShow:) name:UIKeyboardDidShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyBoardDidHidden:) name:UIKeyboardDidHideNotification object:nil];
}
- (void)keyBoardDidShow:(NSNotification *)notification {
    //獲取鍵盤高度
    NSValue *value = [[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey];
    CGSize keyboardSize = [value CGRectValue].size;

    CGRect scrollViewFrame = self.scrollView.frame;
    scrollViewFrame.size.height = self.scrollView.bounds.size.height - keyboardSize.height;
    self.scrollView.frame = scrollViewFrame;
}

- (void)keyBoardDidHidden:(NSNotification *)notification {
    //獲取鍵盤高度
    NSValue *value = [[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey];
    CGSize keyboardSize = [value CGRectValue].size;

    CGRect scrollViewFrame = self.scrollView.frame;
    scrollViewFrame.size.height = self.scrollView.bounds.size.height + keyboardSize.height;
    self.scrollView.frame = scrollViewFrame;
}