ios - 如何检测 UITextView 中的图像删除

Question

如果我像这样将图像添加到 UITextView 中:

NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init];
textAttachment.image = image;

NSAttributedString *attrStringWithImage = [NSAttributedString attributedStringWithAttachment:textAttachment];
[myString appendAttributedString:attrStringWithImage];

self.inputTextView.attributedText = myString;

然后我如何通过用户点击键盘上的后退按钮检测到图像已被删除？

我会使用下面的吗？

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text

如果是，怎么做到的？

Answer 1

我这样做了:

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{
[self.textView.attributedText enumerateAttribute:NSAttachmentAttributeName
                        inRange:NSMakeRange(0, self.textView.attributedText.length)
                        options:0
                     usingBlock:^(id value, NSRange imageRange, BOOL *stop){
     if (NSEqualRanges(range, imageRange) && [text isEqualToString:@""]){
         //Wants to delete attached image
     }else{
         //Wants to delete text
     }

  }];
return YES;
}

希望，能帮到你!