如何在ios Objective-c中使用NSAttributedString在多行标签中添加背景线

Question

我想在objective-c中使用NSAttributedString在多行标签中添加背景线，如下图所示

我使用了以下代码

[yourView.layer setBorderWidth:5.0];
[yourView.layer setBorderColor:[[UIColor colorWithPatternImage:[UIImage imageNamed:@"DotedImage.png"]] CGColor]];///just add image name and create image with dashed or doted drawing and add here

但它不能完美地工作，我想实现适当的方法，我该如何实现。使用这些也不合适Link1,Link2,Link3,Link4

我可以使用以下代码解决

NSAttributedString * title =
            [[NSAttributedString alloc] initWithString:@"I implement My test in here"
                                            attributes:@{NSStrikethroughStyleAttributeName:@(NSUnderlineStyleSingle)}];
            [ self.viewOrderCell.labelItem setAttributedText:title];

Answer 1

以下代码可能有助于解决您的问题。

NSString* textValue = @"Pages you view in iOS Multiple lines of text in";
NSMutableAttributedString *strikeString = [[NSMutableAttributedString alloc] initWithString:textValue];
[strikeString addAttribute:NSStrikethroughStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:NSMakeRange(0, [strikeString length])];
[descriptionLbl  setAttributedText:strikeString];
descriptionLbl.numberOfLines = 0;

Answer 2

你的意思可能是Strike，iOS 6.0及以上，UILabel支持NSAttributedString和NSMutableAttributedString

当使用NSAttributedString时

NSAttributedString * title =
    [[NSAttributedString alloc] initWithString:@"Your String here"
                                    attributes:@{NSStrikethroughStyleAttributeName:@(NSUnderlineStyleSingle)}];
[label setAttributedText:title];

定义：

/** 
 * Returns an NSAttributedString object initialized with a given string and
 attributes.
 *
 *  @param str : The string for the new attributed string.

 *  @param attrs : The attributes for the new attributed string. For information
 *  about where to find the attribute keys you can include in this dictionary,
 *  see the overview section of this document.
 *
 *  @return
     Returns an NSAttributedString object initialized with the characters of aString and the attributes of attributes. The returned object might be different from the original receiver.

 */
- (instancetype)initWithString:(NSString *)str attributes:(NSDictionary *)attrs;

当使用NSMutableAttributedString时

NSMutableAttributedString *attributeString = [[NSMutableAttributedString alloc] initWithString:@"Your String here"];
[attributeString addAttribute:NSStrikethroughStyleAttributeName
                        value:@2
                        range:NSMakeRange(0, [attributeString length])];

定义：

/**
 *
 *  @param name : A string specifying the attribute name. Attribute keys can be
 *  supplied by another framework or can be custom ones you define. For
 *  information about where to find the system-supplied attribute keys, see the
 *  overview section in NSAttributedString Class Reference.  
 *
 *  @param value : The  attribute value associated with name.
 *
 *  @param aRange : The range of characters
 *  to which the specified attribute/value pair applies.
 */
- (void)addAttribute:(NSString *)name value:(id)value range:(NSRange)aRange;

然后

yourLabel.attributedText = attributeString;

Answer 3

NSDictionary *attrDict = @{NSFontAttributeName : [UIFont systemFontOfSize:14.0],NSForegroundColorAttributeName : UIColorFromRGB(0X2846B3)};

NSMutableAttributedString *title =[[NSMutableAttributedString alloc] initWithString:hotleUrl attributes: attrDict];

[title addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:NSMakeRange(0,[title length])];
[urlBttn setAttributedTitle:title forState:UIControlStateNormal];