文本中设置图片

/*

1.创建NSTextAttachment对象

2.设置image属性为需要展示的图片

3.设置bounds属性为需要展示的大小

4.通过NSTextAttachment对象生成NSAttributedString对象

5.通过字符串创建NSMutableAttributedString

6.把NSAttributedString插入到NSMutableAttributedString的任意位置

7.把NSMutableAttributedString赋值给attributedText

*/

//在文本中加入表情

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(20, 20, 300, 200)];

label.numberOfLines= 0;

NSString *text =@"这是一个表情";

UIFont *font = [UIFont systemFontOfSize:30];

label.font = font;

label.text = text;

[self.view addSubview:label];

//创建NSTextAttachment的对象文本附件

NSTextAttachment *attachment = [[NSTextAttachment alloc] init];

//创建图片

UIImage *image = [UIImage imageNamed:@"8.jpg"];

//在文本附件上设置图片

attachment.image= image;

//设置图片大小图片宽高和文字宽高一致

attachment.bounds=CGRectMake(0, 0, font.lineHeight, font.lineHeight);

//根据attachment创建属性字符串

NSAttributedString *attr = [NSAttributedString attributedStringWithAttachment:attachment];

//创建可变属性字符串将原本的text的内容转化为可变的字符串

NSMutableAttributedString *attrStr = [[NSMutableAttributedString alloc] initWithString:text];

//选择插入的文字上的位置第6位

[attrStr insertAttributedString:attrat Index:6];

//替换

[attrStr replaceCharactersInRange:NSMakeRange(5, 1) withAttributedString:attr];

//添加labe进行显示

label.attributedText = attrStr;

//通过资源路径获取图片进行显示

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(20, 20, 300, 200)];

label.numberOfLines= 0;

UIFont *font = [UIFont systemFontOfSize:30];

label.font= font;

[self.view addSubview:label];

NSString *text =@"今天吃饭吃了三碗饭,好开心[笑哈哈],但是胖了三斤[泪流满面]";

//正则表达式

NSString *pattern =@"\\[[a-zA-Z0-9\\u4e00-\\u9fa5]+]";

//创建正则对象

NSRegularExpression *regular = [NSRegularExpression regularExpressionWithPattern:pattern options:0 error:nil];

//接收根据正则表达式搜索到的结果数组

NSArray *resultArray = [regular matchesInString:text options:0 range:NSMakeRange(0, text.length)];

//创建可变属性字符串将原本的text的内容转化为可变的字符串

NSMutableAttributedString *attrStr = [[NSMutableAttributedString alloc] initWithString:text];

//声明偏移量属性

__block NSIntegeroffset = 0;

//遍历结果数组

[resultArray enumerateObjectsUsingBlock:^(NSTextCheckingResult *_Nonnullobj,NSUIntegeridx,BOOL *_Nonnullstop) {

//根据偏移量获取实际是range

NSRange range =NSMakeRange(obj.range.location- offset, obj.range.length);

//取出表情对应的字符串

NSString *face = [text substringWithRange:obj.range];

//创建NSTextAttachment的对象文本附件

NSTextAttachment *attachment = [[NSTextAttachment alloc] init];

//根据名字字符串去资源路径中拿取对应的图片

UIImage *image = [[UIImage alloc] initWithContentsOfFile:[self pathForEmoticonWithName:face]];

//把图片添加到文本附件上

attachment.image = image;

//可以不用设置大小,会自动适应

//attachment.bounds = CGRectMake(0, 0, font.lineHeight, font.lineHeight);

//设置文本附件的属性字符串

NSAttributedString *att = [NSAttributedString attributedStringWithAttachment:attachment];

//图片代替文字

[attrStr replaceCharactersInRange:range withAttributedString:att];

//更新偏移量(这样计算下一个的obj.range.location才不会出错)

//obj.range.length -------5-----6

//offset = obj.range.length - 1 -----4---5

//offset = offset + offset--------4----9

offset += obj.range.length-1;

}];

//加载到label上

label.attributedText= attrStr;

}

//根据图片名字获取图片资源的具体路径

- (NSString *)pathForEmoticonWithName:(NSString *)name {

//资源在哪

NSString *bundlePath = [[NSBundle mainBundle] pathForResource:@"Emoticons" ofType:@"bundle"];

//拼接资源路径

NSString *path1 = [bundlePath stringByAppendingPathComponent:@"com.sina.lxh/info.plist"];

//接收从资源路径获取的字典内容

_dic = [NSDictionary dictionaryWithContentsOfFile:path1];

//从字典中提取出图片包

NSArray *array =_dic[@"emoticons"];

//开始设置要返回的图片资源路径

NSString *path =nil;

//遍历表情包数组里的字典

for(NSDictionary *dicinarray) {

//从字典里找出名字对应的元素

if([dic[@"chs"] isEqualToString:name]) {

//找出图片名字

NSString *png = [dic objectForKey:@"png"];

//拼接出具体的图片资源路径 png = "lxh_xiaohaha.png";

path = [bundlePath stringByAppendingPathComponent:[NSStringstringWithFormat:@"com.sina.lxh/%@",png]];

break;

}

}

//返回具体路径

return path;

}