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IOS TextFiled与TextView 键盘的收起以及处理键盘遮挡

2020-07-26 02:59:44
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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。

感谢阅读,希望能帮助到大家,谢谢大家对本站的支持!

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