分享几个常用的 属性字符串NSAtrributeString 和 NSString 普通字符串的 转换方法:
一:把普通的字符串,替换为包含图片的属性字符串
plist 文件,图片 格式见下图:
+(NSMutableAttributedString *)stringToAttributeString:(NSString *)text
{
//先把普通的字符串text转化生成Attributed类型的字符串
NSMutableAttributedString * attStr = [[NSMutableAttributedString alloc]initWithString:text];
NSString * zhengze = @"\\[[a-zA-Z0-9\\u4e00-\\u9fa5]+\\]"; //正则表达式 ,例如 [呵呵] 这种形式的通配符
NSError * error;<span style="font-family: Arial, Helvetica, sans-serif;"> NSRegularExpression * re = [NSRegularExpression regularExpressionWithPattern:zhengze options:NSRegularExpressionCaseInsensitive error:&error];//正则表达式</span>
if (!re)
{
NSLog(@"%@",[error localizedDescription]);//打印错误
}
NSArray * arr = [re matchesInString:text options:0 range:NSMakeRange(0, text.length)];//遍历字符串,获得所有的匹配字符串
NSBundle *bundle = [NSBundle mainBundle];
NSString * path = [bundle pathForResource:@"emotions" ofType:@"plist"]; //plist文件,制作一个 数组,包含文字,表情图片名称
NSArray * face = [[NSArray alloc]initWithContentsOfFile:path]; //获取 所有的数组
//如果有多个表情图，必须从后往前替换，因为替换后Range就不准确了
for (int j =(int) arr.count - 1; j >= 0; j--) {
//NSTextCheckingResult里面包含range
NSTextCheckingResult * result = arr[j];
for (int i = 0; i < face.count; i++) {
if ([[text substringWithRange:result.range] isEqualToString:face[i][@"chs"]])//从数组中的字典中取元素
{
NSString * imageName = [NSString stringWithString:face[i][@"png"]];
NSTextAttachment * textAttachment = [[NSTextAttachment alloc]init];//添加附件,图片
textAttachment.image = [UIImage imageNamed:imageName];
NSAttributedString * imageStr = [NSAttributedString attributedStringWithAttachment:textAttachment];
[attStr replaceCharactersInRange:result.range withAttributedString:imageStr];//替换未图片附件
break;
}
}
}
return attStr;
}
注:对包含文字和图片的属性字符串,需要根据实际情况,调节其大小
+(CGSize)getAttributedTextSize:(NSString *)text
{
//先把普通的字符串text转化生成Attributed类型的字符串
NSMutableAttributedString * attStr = [[NSMutableAttributedString alloc]initWithString:text];
NSString * zhengze = @"\\[[a-zA-Z0-9\\u4e00-\\u9fa5]+\\]";
NSError * error;
NSRegularExpression * re = [NSRegularExpression regularExpressionWithPattern:zhengze options:NSRegularExpressionCaseInsensitive error:&error];
if (!re)
{
NSLog(@"正则表达式匹配错误%@",[error localizedDescription]);
}
NSArray * arr = [re matchesInString:text options:0 range:NSMakeRange(0, text.length)];
if (!arr.count)//说明字符串中没有表情通配符,是普通的文本,则计算文本size
{
NSDictionary *dic=@{NSFontAttributeName: [UIFont systemFontOfSize:14]};
CGSize size1=[text boundingRectWithSize:CGSizeMake(160, 1000) options:NSStringDrawingUsesLineFragmentOrigin attributes:dic context:nil].size;
if (size1.height<=60)
{
size1.height=60;
}
else
{
size1.height+=15;
}
return size1;
}
NSBundle *bundle = [NSBundle mainBundle];
NSString * path = [bundle pathForResource:@"emotions" ofType:@"plist"];
NSArray * face = [[NSArray alloc]initWithContentsOfFile:path];
//如果有多个表情图，必须从后往前替换，因为替换后Range就不准确了
for (int j =(int) arr.count - 1; j >= 0; j--) {
//NSTextCheckingResult里面包含range
NSTextCheckingResult * result = arr[j];
for (int i = 0; i < face.count; i++) {
if ([[text substringWithRange:result.range] isEqualToString:face[i][@"chs"]])
{
NSString * imageName = [NSString stringWithString:face[i][@"png"]];
NSTextAttachment * textAttachment = [[NSTextAttachment alloc]init];
textAttachment.image = [UIImage imageNamed:imageName];
NSAttributedString * imageStr = [NSAttributedString attributedStringWithAttachment:textAttachment];
[attStr replaceCharactersInRange:result.range withAttributedString:imageStr];
break;
}
}
}
CGSize size2=[attStr boundingRectWithSize:CGSizeMake(180, 1000) options:NSStringDrawingUsesLineFragmentOrigin context:nil].size;
size2.height+=40; //表情文字增加高度
return size2;//返回属性字符串的尺寸
}
图片二进制比对,获得图片名称:
//不能直接得到串的名字?
-(NSString *)stringFromImage:(UIImage *)image
{
NSArray *face=[self getAllImagePaths];
NSData * imageD = UIImagePNGRepresentation(image);
NSString * imageName;
for (int i=0; i<face.count; i++)
{
UIImage *image=[UIImage imageNamed:face[i][@"png"]];
NSData *data=UIImagePNGRepresentation(image);
if ([imageD isEqualToData:data])
{
imageName=face[i][@"chs"];
//NSLog(@"匹配成功!");
}
}
return imageName;
}
-(NSArray *)getAllImagePaths//数组结构还是上述的截图的数组结构
{
NSBundle *bundle = [NSBundle mainBundle];
NSString * path = [bundle pathForResource:@"emotions" ofType:@"plist"];
NSArray * face = [[NSArray alloc]initWithContentsOfFile:path];
return face;
}属性字符串转换为普通字符串:
假设为TextView,label,button同理
//把带有图片的属性字符串转成普通的字符串
-(NSString *)textString
{
NSAttributedString * att = self.attributedText;
NSMutableAttributedString * resutlAtt = [[NSMutableAttributedString alloc]initWithAttributedString:att];
__weak __block UITextView * copy_self = self;
//枚举出所有的附件字符串
[att enumerateAttributesInRange:NSMakeRange(0, att.length) options:NSAttributedStringEnumerationReverse usingBlock:^(NSDictionary *attrs, NSRange range, BOOL *stop) {
//key-NSAttachment
//NSTextAttachment value类型
NSTextAttachment * textAtt = attrs[@"NSAttachment"];//从字典中取得那一个图片
if (textAtt)
{
UIImage * image = textAtt.image;
NSString * text = [copy_self stringFromImage:image];
[resutlAtt replaceCharactersInRange:range withString:text];
}
}];
return resutlAtt.string;
}
ios开发之属性字符串NSAttributeString与NSString相互转换包含图片
原文地址：http://blog.csdn.net/yangbingbinga/article/details/43084847
