IOS TextFiled与TextView 键盘的收起以及处理键盘遮挡

ios textfiled与textview 键盘的收起以及处理键盘遮挡

  在ios开发中，uitextfiled和uitextview是很常见的两个控件，当我们设置好这两个控件后，点击文字输入区域，系统会自动弹出键盘，但是如何收起键盘、点击哪里收起键盘，以及在iphone4中键盘弹出后遮挡输入框怎么办呢？

这篇文章将带领大家解决：

1》点击其他空白区域收起键盘
2》点击键盘右下角的键收起键盘
3》处理键盘遮挡问题

一，点击其他空白区域收起键盘

- (void)viewdidload { 
  [super viewdidload]; 
 
  [self setupfordismisskeyboard];   
} 

#pragma mark - 回收任何空白区域键盘事件 
- (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会将self.view里所有的subview的first responder都resign掉 
  [self.view endediting:yes]; 
} 

 二，点击键盘右下角的键收起键盘

#pragma mark - textview 代理方法 
 
-(bool)textview:(uitextview *)textview shouldchangetextinrange:(nsrange)range replacementtext:(nsstring *)text 
{ 
  if ([text isequaltostring:@"\n"]) { 
     
    [self.worklogtextview resignfirstresponder]; 
     
    return no; 
  } 
   
  return yes; 
} 

注意：需要遵守textview/textfiled的代理。改代码是textview代理方法，若实际用到的是textfiled，只需调用textfiled的该类方法即可。

三，处理键盘遮挡问题

#pragma mark 键盘遮挡 
- (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; 
} 

注意：需要遵守 uiscrollviewdelegate 和 textview/textfiled的代理。需要该页面的父视图是uiscrollview，才能保证弹出键盘时页面向上移动，收起键盘时页面向下移动。代码中的self.backscrollview就是对应的父视图，使用时请替换掉。

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