Question

我刚刚尝试使用本机NSAtrributedstring和NStextAttachment在textview中添加图像，从本文here获得一些帮助

但是，我无法做到。我正在使用nativescript-mediafilepicker库从照片库添加图像，然后使用其内置方法之一将PH图像转换为UIImage。但是textview不会随图像更新。但是，我可以通过NSattributedstring而不是image添加更多的字符串。

这是我的代码。

                  //creating and initilizing new NSMutableAttributedString
                   var attributedString = NSMutableAttributedString.alloc().initWithString(textview.ios.text);
                   textview.ios.attributedText = attributedString;

                  //value is an UIImage object what the convertPHImageToUIImage method returns
                   var image = value;

                  console.log(image);
                  //the above log prints<UIImage: 0x2817ac4d0> size {4032, 3024} orientation 0 scale 1.000000



                  let oldWidth = image.size.width;
                  // console.log(oldWidth);
                  let scaleFactor = oldWidth / (textview.ios.frame.size.width - 10);
                    //console.log(scaleFactor);
                  let orientation="up";

                    //create NStextAttachment

                   let textAttachment = NSTextAttachment.alloc().init();
                   //adding UIImage object to NSTextAttachment
                    textAttachment.image = UIImage.imageWithCGImageScaleOrientation(image.CGImage ,scaleFactor , orientation)
                  // console.dir(textAttachment);

                   //creating a new NSAttributedString
                    let attrStringWithImage = NSAttributedString.alloc().init();
                    //console.dir(attrStringWithImage);
                    attrStringWithImage.attachment = textAttachment;
                    console.dir(attrStringWithImage)

                   //appenind the NSAttributedString to the mutable string..
                    attributedString.appendAttributedString(attrStringWithImage);
                    //console.log(attributedString.containsAttachmentsInRange(textview.ios.selectedRange));
                    textview.ios.attributedText = attributedString;

                     //textview.ios.textStorage.insertAttributedStringAtIndex(attrStringWithImage,textview.ios.selectedRange.location)
                    //this doesn't work either

Answer 1

如果您使用的是TypeScript，请安装tns-platform-declarations，这将使您在访问本机api时的生活更加轻松。

UIImage.imageWithCGImageScaleOrientation(cgImage, scale, orientation);

此docs将帮助您了解将Objective C转换为JavaScript / TypeScript的情况。

使用Nativescript中的本机NStextattachment和NSattributedString在textview中添加图像

1 个答案: