背景:在实现textView的富文本时,如果添加一张图片后,如果直接发送textView的内容时,图片会被字符串“\U0000fffc”替换。
问题:如何删除“\U0000fffc”字符串;如何替换textView中图片的字符串;textView添加完图片后,之前设置的textView的属性被初始化了,怎么办?
方法:
(1)对于第一个问题,百度到的答案如下:
NSString *codeString = @"\uFFFC";
NSString *msg=[msg stringByReplacingOccurrencesOfString:codeString withString:@""];
这个方法,试了之后,就可以的。
(2)基于textView的图片替换,一个个人觉得比较合适的方式如下:
因为textView添加图片时,用的是 NSTextAttachment 控件,所以,基于这个方法下,
/**
将富文本转换为带有图片标志的纯文本
sysmbol: 是图片的标志的字符串,例如:[图片]
attributeString: 富文本字符串
*/
- (NSString *)textStringWithSymbol:(NSString *)symbol attributeString:(NSAttributedString *)attributeString{
NSString *string = attributeString.string;
//最终纯文本
NSMutableString *textString = [NSMutableString stringWithString:string];
//替换下标的偏移量
__block NSUInteger base = 0; //遍历
[attributeString enumerateAttribute:NSAttachmentAttributeName inRange:NSMakeRange(0, attributeString.length)
options:0
usingBlock:^(id value, NSRange range, BOOL *stop) {
//检查类型是否是自定义NSTextAttachment类
if (value && [value isKindOfClass:[NSTextAttachment class]]) {
//替换
[textString replaceCharactersInRange:NSMakeRange(range.location + base, range.length) withString:symbol];
//增加偏移量
base += (symbol.length - 1);
//将富文本中最终确认的照片取出来
NSTextAttachment *attachmentImg = (NSTextAttachment *)value;
[self.mutImgArray addObject:attachmentImg.image];
}
}]; return textString;
}
(3)textView添加完图片后,之前设置的textView的属性被初始化了。这个问题的意思是,如果textView的字体大小设置为18,颜色为紫色;添加完图片后,textView的字体大小为14,字体颜色为黑色(textView自带的效果);原因不详,解决方法是,设置完图片后,对textView的属性重新设置。
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
[self dismissViewControllerAnimated:YES completion:^{
UIImage * img = [info objectForKey:UIImagePickerControllerOriginalImage];
[self uploadPicture:img];
NSTextAttachment* textAttachment = [[NSTextAttachment alloc] init];
textAttachment.image = img;
textAttachment.bounds = CGRectMake(0, 0, self.view.frame.size.width - 28, [self getImgHeightWithImg:img]);
NSAttributedString* imageAttachment = [NSAttributedString attributedStringWithAttachment:textAttachment];
NSMutableAttributedString *attriStr = [_textView.attributedText mutableCopy];
[attriStr appendAttributedString:imageAttachment]; _textView.attributedText = attriStr; //-------对textView的属性重新设置
_textView.textColor = [UIColor purpleColor];
_textView.font = [UIFont systemFontOfSize:18];
}];
}