IOS TextFiled與TextView 鍵盤的收起以及處置鍵盤遮擋

  在IOS開發中，UITextFiled和UITextView是很罕見的兩個控件，當我們設置好這兩個控件後，點擊文字輸出區域，零碎會自動彈出鍵盤，但是如何收起鍵盤、點擊哪裡收起鍵盤，以及在iPhone4中鍵盤彈出後遮擋輸出框怎樣辦呢？

這篇文章將率領大家處理：

1》點擊其他空白區域收起鍵盤
2》點擊鍵盤右下角的鍵收起鍵盤
3》處置鍵盤遮擋問題

一，點擊其他空白區域收起鍵盤

- (void)viewDidLoad { 
  [super viewDidLoad]; 
 
  [self setUpForDismissKeyboard];   
} 

#pragma mark - 回收任何空白區域鍵盤事情 
- (void)setUpForDismissKeyboard { 
  NSNotificationCenter *nc = [NSNotificationCenter defaultCenter]; 
  UITapGestureRecognizer *singleTapGR = 
  [[UITapGestureRecognizer alloc] initWithtarget:self 
                      action:@selector(tapAnywhereToDismissKeyboard:)]; 
  NSOperationQueue *mainQuene =[NSOperationQueue mainQueue]; 
  [nc addObserverForName:UIKeyboardWillShowNotification 
          object:nil 
           queue:mainQuene 
        usingBlock:^(NSNotification *note){ 
          [self.view addGestureRecognizer:singleTapGR]; 
        }]; 
  [nc addObserverForName:UIKeyboardWillHideNotification 
          object:nil 
           queue:mainQuene 
        usingBlock:^(NSNotification *note){ 
          [self.view removeGestureRecognizer:singleTapGR]; 
        }]; 
} 
 
- (void)tapAnywhereToDismissKeyboard:(UIGestureRecognizer *)gestureRecognizer { 
  //此method會將self.view裡一切的subview的first responder都resign掉 
  [self.view endEditing:YES]; 
} 

 二，點擊鍵盤右下角的鍵收起鍵盤

#pragma mark - TextView 代理辦法 
 
-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text 
{ 
  if ([text isEqualToString:@"\n"]) { 
     
    [self.workLogTextView resignFirstResponder]; 
     
    return NO; 
  } 
   
  return YES; 
} 

留意：需求恪守textView/textFiled的代理。改代碼是textView代理辦法，若實踐用到的是textFiled，只需調用textFiled的該類辦法即可。

三，處置鍵盤遮擋問題

#pragma mark 鍵盤遮擋 
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView { 
  if (self.userInfo.isPhone4) { 
    CGFloat offset_y = 0.f; 
    if (textView.tag == CALL_CONTENT_TEXTFIRLD) { 
      offset_y = 100.f; 
    } 
    CGPoint point = self.BackScrollView.contentOffset; 
    point = CGPointMake(point.x, offset_y); 
    [UIView animateWithDuration:0.25 animations:^{ 
      self.BackScrollView.contentOffset = point; 
    }]; 
  } 
  return YES; 
} 
 
 
- (BOOL)textViewShouldEndEditing:(UITextView *)textView{ 
  if (self.userInfo.isPhone4) { 
    CGFloat offset_y = 0.f; 
    if (textView.tag == CALL_CONTENT_TEXTFIRLD) { 
      offset_y = 100.f; 
    } 
    CGPoint point = self.BackScrollView.contentOffset; 
    point = CGPointMake(point.x, 0); 
    [UIView animateWithDuration:0.25 animations:^{ 
      self.BackScrollView.contentOffset = point; 
    }]; 
  } 
  return YES; 
} 

留意：需求恪守 UIScrollViewDelegate 和 textView/textFiled的代理。需求該頁面的父視圖是UIScrollView，才干保證彈出鍵盤時頁面向上挪動，收起鍵盤時頁面向下挪動。代碼中的self.BackScrollView就是對應的父視圖，運用時請交換掉。

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