文章/答案/技术大牛

发布

社区首页 >问答首页 >UITextField rightView "WhileEditing“问题

问UITextField rightView "WhileEditing“问题
EN

Stack Overflow用户

提问于 2011-08-24 02:15:21

回答 6查看 9.7K关注 0票数 7

我尝试将UITextField子类化如下，以将自定义rightView实现为一个清晰的按钮：

-(void) drawRect:(CGRect)rect
{

    [self.layer setBackgroundColor:[[UIColor colorWithRed:20.0/255.0 green:20.0/255.0 blue:20.0/255.0 alpha:1] CGColor]];
    [self.layer setCornerRadius:15.0];

    UIImage  *imgClear = [UIImage imageNamed:@"btnClear"];
    CGSize iSize = [imgClear size];

    UIButton *clearButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, iSize.width, iSize.height)];

    [clearButton setImage:imgClear forState:UIControlStateNormal];
    [clearButton addTarget:self action:@selector(clearText:) forControlEvents:UIControlEventTouchUpInside];

    [self setRightViewMode:UITextFieldViewModeWhileEditing];
    [self setRightView:clearButton];

    [clearButton release];
}

但问题是:当文本字段变成焦点时，“清晰”的-button也会变得可见，而当我开始轻敲键盘时，它就消失了。有什么想法吗？

uibutton

uitextfield

objective-c

ios

回答 6

Stack Overflow用户

回答已采纳

发布于 2012-12-25 11:56:33

我也遇到了同样的问题。我猜这是一个iOS错误，然而，我试图通过下面的实现来修复这个问题，它对我来说工作得很好。希望这能对你有所帮助。

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString {
    ...
    [self addTarget:self action:@selector(onEditing:) forControlEvents: UIControlEventEditingChanged]
    ...
}

-(void) onEditing:(id)sender {
    if(![self.text isEqualToString:@""]){
        self.rightViewMode = UITextFieldViewModeAlways;
    }else{
        self.rightViewMode = UITextFieldViewModeNever;
    }
}
- (BOOL)becomeFirstResponder{
    BOOL ret = YES ;
    ret = [super becomeFirstResponder] ;
    if( ret & ![self.text isEqualToString:@""]){
        self.rightViewMode = UITextFieldViewModeAlways;
    }else{
        self.rightViewMode = UITextFieldViewModeNever;
    }

    return ret ;
}
- (BOOL)resignFirstResponder
{
    BOOL ret = YES ;
    ret = [super resignFirstResponder] ;
    if( ret )
        self.rightViewMode = UITextFieldViewModeNever;
    return ret ;
}
- (void) clearText:(id)sender
{
    self.text = @"";
    self.rightViewMode = UITextFieldViewModeNever;
}

票数 5

Stack Overflow用户

发布于 2012-02-23 15:45:24

您应该使用：[self setRightViewMode:UITextFieldViewModeAlways];

票数 4

Stack Overflow用户

发布于 2013-05-10 03:44:49

子类化UITextField并重写-layoutSubviews。

- (void)layoutSubviews
{
   [super layoutSubviews];

   // HACK: There is an iOS bug where the right view is not displayed when there is text in the text field. Also, iOS adds and removes the rightView. This code adds the right view and uses hide-unhide instead.

   UIView *rightView = [self rightView];

   if (rightView != nil && [self clearButtonMode] == UITextFieldViewModeNever) {
      BOOL showRightView;
      BOOL isFirstResponder = [self isFirstResponder];

      switch ([self rightViewMode]) {
      case UITextFieldViewModeNever:
         showRightView = FALSE;
         break;
      case UITextFieldViewModeWhileEditing:
         showRightView = isFirstResponder;
         break;
      case UITextFieldViewModeUnlessEditing:
         showRightView = !isFirstResponder;
         break;
      case UITextFieldViewModeAlways:
      default:
         showRightView = TRUE;
         break;         
      }

      showRightView = (showRightView && ![[self text] isEqualToString:@""]);

      [rightView setFrame:[self rightViewRectForBounds:[self bounds]]];
      [rightView setHidden:!showRightView];

      [self addSubview:rightView];
   }
}

票数 1

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/7165642

复制

相似问题

问UITextField rightView "WhileEditing“问题
EN

回答 6

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问UITextField rightView "WhileEditing“问题EN

回答 6

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问UITextField rightView "WhileEditing“问题
EN