UITextView末尾的额外空间

Question

我在UITextView中添加了文字，并了解了我使用青色为UITextView着色的边界。

在google.com之后，我想删除一些额外的空间。

- (void)viewDidLoad {
        [super viewDidLoad];
        NSString *desc = [self htmlAfterReplacingTagsAndAddingStyle];
        _descriptionTextView.attributedText = [[NSAttributedString alloc] initWithData: [desc dataUsingEncoding:NSUTF8StringEncoding] options: @{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType } documentAttributes:nil error:nil];
        _descriptionTextView.linkTextAttributes = @{ NSForegroundColorAttributeName: [UIColor blueColor], NSUnderlineStyleAttributeName: [NSNumber numberWithInt:NSUnderlineStyleSingle] };
        _descriptionTextView.dataDetectorTypes = UIDataDetectorTypeLink;
        _descriptionTextView.scrollEnabled = NO;
        [self setTextViewHeight];
    }

setTextViewHeight

- (void)setTextViewHeight {
    UIFont *font = [UIFont fontWithName:@"OpenSans" size:14.0];
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, _descriptionContainer.frame.size.width, CGFLOAT_MAX)];
    label.numberOfLines = 0;
    label.lineBreakMode = NSLineBreakByWordWrapping;
    label.font = font;
    NSString *desc = [self htmlAfterReplacingTagsAndAddingStyle];
    label.attributedText = [[NSAttributedString alloc] initWithData: [desc dataUsingEncoding:NSUTF8StringEncoding] options: @{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType } documentAttributes:nil error:nil];
    [label sizeToFit];
    _descriptionTextView.backgroundColor = UIColor.cyanColor;
    [_descriptionTextView setContentInset:UIEdgeInsetsMake(0, 0, -80, 0)];
    _descriptionContainerHeight.constant = label.frame.size.height;
    }

我读过关于设置内容插入的内容，但这没有帮助。更改-80的值没有任何影响。

我会很感激一些指针可以帮助我删除uitextView底部的额外空间。

Answer 1

使用

 [_descriptionTextView setTextContainerInset:UIEdgeInsetsMake(0, 0, 0, 0)];

可以在UITextView类引用

中呈现

  

textContainerInset属性文本容器布局的插图   文本视图内容区域内的区域。

     

宣言

     

目标-C   @property（非原子，分配）UIEdgeInsets   textContainerInset

     

讨论

     

此属性提供文本边距   文本视图中列出的文本。默认情况下，此属性的值   是（8,0,8,0）。

希望这有帮助

Answer 2

你应该可以使用textContainerInset获取某个地方（请参阅@ReinierMelian答案）。还有机会大大简化文本高度测量...

UIFont *font = [UIFont fontWithName:@"OpenSans" size:14.0];
CGFloat width = _descriptionTextView.bounds.size.width;
NSString *string = [self htmlAfterReplacingTagsAndAddingStyle];
CGRect rect = [string boundingRectWithSize:CGSizeMake(width, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{ NSFontAttributeName:font } context:nil];

CGRect frame = _descriptionTextView.frame;
frame.size = CGSizeMake(width, rect.size.height);
_descriptionTextView.frame = frame;
// due to @ReinierMelian...
_descriptionTextView.extContainerInset = UIEdgeInsetsMake(0, 0, 0, 0);

Answer 3

删除所有填充：

[textView setTextContainerInset:UIEdgeInsetsZero];
textView.textContainer.lineFragmentPadding = 0; // to remove left padding

如果要将多个新行删除为单个行， 在textViewDidEndEditing:

NSError *error = nil;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"\n+" options:NSRegularExpressionCaseInsensitive error:&error];
NSString *trimmedString = [regex stringByReplacingMatchesInString:string options:0 range:NSMakeRange(0, [string length]) withTemplate:@" "];
textView.text = trimmedString;