iOS工程中对富文本的使用封装

在iOS开发过程中，经常会用到很多酷炫的文本，比如说文本中的某些文字要改变字号大小和文字颜色，某些文字要支持点击功能等，这些如果我们用Label文本是比较难以实现的，所以我们采用富文本的形式来实现这些功能。代码示例如下，效果图往下翻：

/**
 *  #pragma mark -- 富文本的封装 --
 */
+ (NSMutableAttributedString*_Nullable)createMutableAttibutedStingWithPrefixStr:(NSString *_Nullable)prefixStr
        SuffixStr:(NSString *_Nullable)SuffixStr
 prefixStrColor:(UIColor *_Nullable)prefixStrColor
  SuffixStrColor:(UIColor *_Nullable)SuffixStrColor
   prefixStrFont:(CGFloat)prefixStrFont
   SuffixStrFont:(CGFloat)SuffixStrFont
{
NSMutableAttributedString *mutableAttributedStr = [NSMutableAttributedString new];

    // set family price
    NSMutableAttributedString *mutabPrefixStr
    = [[NSMutableAttributedString alloc]
       initWithString:prefixStr
       attributes:@{NSForegroundColorAttributeName : prefixStrColor,
                    NSFontAttributeName : [UIFont systemFontOfSize:prefixStrFont]}];
    NSMutableAttributedString *mutabSuffixStr
    = [[NSMutableAttributedString alloc]
       initWithString:SuffixStr
       attributes:@{NSForegroundColorAttributeName : SuffixStrColor,
                    NSFontAttributeName : [UIFont systemFontOfSize:SuffixStrFont]}];
    [mutabPrefixStr appendAttributedString:mutabSuffixStr];
    mutableAttributedStr = mutabPrefixStr;

    return mutableAttributedStr;
}

上面是对于文字颜色和文字字号的设置，下面我们来看下文本中支持点击的富文本是神马样子滴？！

/**
 *  #pragma mark -- 可点击的富文本 --
 */
+(NSMutableAttributedString *_Nullable)setAttributedStringWithRecommedAtt:(NSString *_Nullable)recommedAtt
                                                         recommedAttibutes:(nullable NSDictionary<NSString *, id> *)recommedAttibutes
                                                                contentAtt:(NSString *_Nullable)contentAtt
                                                          contentAttibutes:(nullable NSDictionary<NSString *, id> *)contentAttibutes
                                                             rangeOfString:(NSString *_Nullable)rangeOfString
                                                        linkAttributeValue:(id _Nullable )linkAttributeValue

{
    NSMutableAttributedString *recommedAtti
    = [[NSMutableAttributedString alloc]initWithString:recommedAtt
                                            attributes:recommedAttibutes];
    NSMutableAttributedString *contentAtti = [[NSMutableAttributedString alloc]initWithString:contentAtt
                                                                                   attributes:contentAttibutes];
    
    //获取需点击的文字
    if ([rangeOfString isEqualToString:@""] == NO ||
        [rangeOfString isKindOfClass:[NSNull class]] == NO ||
        rangeOfString != nil)
    {
        NSRange range = [[contentAtti string] rangeOfString:rangeOfString];
        [contentAtti addAttribute:NSLinkAttributeName value:linkAttributeValue range:range];
    }
    
    [recommedAtti appendAttributedString:contentAtti];
    
    return recommedAtti;
}

这个方法返回的富文本需配合使用UITextView使用，可点击的文本需赋值给UITextView显示，实现UItextView的这个代理:

- (BOOL)     textView:(UITextView*)textView
shouldInteractWithURL:(NSURL*)URL
              inRange:(NSRange)characterRange

接下来我们再看下富文本中插入图片，是怎么实现的，代码来也。。。

+(NSMutableAttributedString *)lableInsertImageByString:(NSString *)string
                                  needInsertImageNamed:(NSString *)imageNamed
                                           imageBounds:(CGRect)imageBounds
                                         insertAtIndex:(NSInteger)atIndex
{
    //文本中放置图片
    NSMutableAttributedString *attri = [[NSMutableAttributedString alloc] initWithString:string];
    // 添加图片
    NSTextAttachment *attch = [[NSTextAttachment alloc] init];
    // 插入图片
    attch.image = [UIImage imageNamed:imageNamed];
    // 设置图片大小
    attch.bounds = imageBounds;//CGRectMake(0, -2, 22, 18);
    
    // 创建带有图片的富文本
    NSAttributedString *attStr = [NSAttributedString attributedStringWithAttachment:attch];
    
    //图片插入文本中的位置
    [attri insertAttributedString:attStr atIndex:atIndex];
    return attri;

}

以上是用于UILabel和UITextView的文本显示的，下面我们再来按下UIButton上使用富文本，构造出来的是什么效果呢，期待。。。往下看代码实现：

/**
 *  #pragma mark -- 自定义按钮 --
 */
+ (void)customsButtonWithButton:(UIButton *)button
                       TopTitle:(NSString *_Nullable)topTitle
                    bottomTitle:(NSString *_Nullable)bottomTitle
                   topTitleFont:(CGFloat)topTitleFont
                bottomTitleFont:(CGFloat)bottomTitleFont
                  topTitleColor:(UIColor *_Nullable)topTitleColor
               bottomTitleColor:(UIColor *_Nullable)bottomTitleColor
                 titleAlignment:(NSTextAlignment)titleAlignment
                      imageName:(NSString *_Nullable)imageName
                    titleInsert:(UIEdgeInsets)titleInsert
                    imageInsert:(UIEdgeInsets)imageInsert
{
    NSMutableAttributedString *topMutableStr
    = [[NSMutableAttributedString alloc]
       initWithString:[NSString stringWithFormat:@"%@\n",topTitle]
       attributes:@{NSForegroundColorAttributeName : topTitleColor,
                    NSFontAttributeName : [UIFont systemFontOfSize:topTitleFont]}];
    NSMutableAttributedString *bottomMutableStr
    = [[NSMutableAttributedString alloc]
       initWithString:bottomTitle
       attributes:@{NSForegroundColorAttributeName : bottomTitleColor,
                    NSFontAttributeName : [UIFont systemFontOfSize:bottomTitleFont]}];
    
    [topMutableStr appendAttributedString:bottomMutableStr];
    
    [bottomTitle isEqualToString:@""]== NO ||
    [bottomTitle isKindOfClass:[NSNull class]] == NO ||
    bottomTitle != nil ? [button setAttributedTitle:topMutableStr forState:UIControlStateNormal]
                       : [button setTitle:topTitle forState:UIControlStateNormal];
    
    [button setImage:[UIImage imageNamed:imageName] forState:UIControlStateNormal];
    
    button.titleEdgeInsets = titleInsert;
    button.imageEdgeInsets = imageInsert;
    button.titleLabel.numberOfLines = 0;
    
    button.titleLabel.textAlignment = titleAlignment;
    button.titleLabel.lineBreakMode = NSLineBreakByWordWrapping;
}

好了,大家如有好的想法和建议可留言相互交流学习，奉上以上的实现效果如下：

代码测试.png