Question

如果我将图像添加到UITextView中，如下所示：

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

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

self.inputTextView.attributedText = myString;

如何通过用户点击键盘上的后退按钮来检测图像是否已被删除？

我会使用下面的内容吗？

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

若然，怎么样？

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！

Answer 2

使用swift，这是我从UITextView中删除图像（添加为NSTextAttachment）的方式：

func textView(textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {

    // empty text means backspace
    if text.isEmpty {
        textView.attributedText.enumerateAttribute(NSAttachmentAttributeName, inRange: NSMakeRange(0, textView.attributedText.length), options: NSAttributedStringEnumerationOptions(rawValue: 0)) { [weak self] (object, imageRange, stop) in

            if NSEqualRanges(range, imageRange) {
                self?.attributedText.replaceCharactersInRange(imageRange, withString: "")
            }
        }
    }

    return true
}

如何检测UITextView中的图像删除

2 个答案: