如何在IOS中的UITextView中添加图像和文本？

Question

我想在UITextView中添加文本和图像.应根据文本和图像的长度扩展textview.简而言之,我想要做的是,当我从相机中捕获图像或从图库中选择时,它应该显示在UITextView中,我还应该能够添加一些类似于Facebook的图像文本.我还附加了一个图像, UITextView的外观如何.

Answer 1

现在绝对可以使用

+ (NSAttributedString *)attributedStringWithAttachment:(NSTextAttachment *)attachment

请参阅此处的 Apple文档

这个例子取自另一个答案:

UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(0,0,140,140)];
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:@"before after"];
NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init];
textAttachment.image = [UIImage imageNamed:@"sample_image.jpg"];

CGFloat oldWidth = textAttachment.image.size.width;

//I'm subtracting 10px to make the image display nicely, accounting
//for the padding inside the textView
CGFloat scaleFactor = oldWidth / (textView.frame.size.width - 10);
textAttachment.image = [UIImage imageWithCGImage:textAttachment.image.CGImage scale:scaleFactor orientation:UIImageOrientationUp];
NSAttributedString *attrStringWithImage = [NSAttributedString attributedStringWithAttachment:textAttachment];
[attributedString replaceCharactersInRange:NSMakeRange(6, 1) withAttributedString:attrStringWithImage];
textView.attributedText = attributedString;

使用上面的代码将在iOS 7+上的UITextView中为您提供带有文本的图像.您可以根据需要/显示属性文本的样式,并可能设置图像的宽度以确保它适合您的textView(以及设置您自己的宽高比/比例首选项)

这是一个快速测试图像:

Answer 2

谢谢你的代码,它确实有效.我在Swift中创建了一个代码,所以我想分享你的代码的Swift版本.我检查了这段代码也有效.

let textView = UITextView(frame: CGRectMake(50, 50, 200, 300))
let attributedString = NSMutableAttributedString(string: "before after")
let textAttachment = NSTextAttachment()
textAttachment.image = UIImage(named: "sample_image.jpg")!

let oldWidth = textAttachment.image!.size.width;

//I'm subtracting 10px to make the image display nicely, accounting
//for the padding inside the textView
let scaleFactor = oldWidth / (textView.frame.size.width - 10);
textAttachment.image = UIImage(CGImage: textAttachment.image!.CGImage, scale: scaleFactor, orientation: .Up)
var attrStringWithImage = NSAttributedString(attachment: textAttachment)
attributedString.replaceCharactersInRange(NSMakeRange(6, 1), withAttributedString: attrStringWithImage)
textView.attributedText = attributedString;
self.view.addSubview(textView)

代码为Swift 3.0

var attributedString :NSMutableAttributedString!
attributedString = NSMutableAttributedString(attributedString:txtBody.attributedText)
let textAttachment = NSTextAttachment()
textAttachment.image = image

let oldWidth = textAttachment.image!.size.width;   

//I'm subtracting 10px to make the image display nicely, accounting
//for the padding inside the textView

let scaleFactor = oldWidth / (txtBody.frame.size.width - 10);
textAttachment.image = UIImage(cgImage: textAttachment.image!.cgImage!, scale: scaleFactor, orientation: .up)
let attrStringWithImage = NSAttributedString(attachment: textAttachment)
attributedString.append(attrStringWithImage)
txtBody.attributedText = attributedString;

Answer 3

如果你只想将图像放在最后,你可以使用

//create your UIImage
let image = UIImage(named: change_arr[indexPath.row]);
//create and NSTextAttachment and add your image to it.
let attachment = NSTextAttachment()
attachment.image = image
//put your NSTextAttachment into and attributedString
let attString = NSAttributedString(attachment: attachment)
//add this attributed string to the current position.
textView.textStorage.insertAttributedString(attString, atIndex: textView.selectedRange.location)

检查这个答案

Answer 4

如果你想从相机获取图像，你可以尝试下面的代码：（Swift 3.0）

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    let image = info[UIImagePickerControllerOriginalImage] as! UIImage
    //create and NSTextAttachment and add your image to it.
    let attachment = NSTextAttachment()
    attachment.image = image
    //calculate new size.  (-20 because I want to have a litle space on the right of picture)
    let newImageWidth = (textView.bounds.size.width - 20 )
    let scale = newImageWidth/image.size.width
    let newImageHeight = image.size.height * scale
    //resize this
    attachment.bounds = CGRect.init(x: 0, y: 0, width: newImageWidth, height: newImageHeight)
    //put your NSTextAttachment into and attributedString
    let attString = NSAttributedString(attachment: attachment)
    //add this attributed string to the current position.
    textView.textStorage.insert(attString, at: textView.selectedRange.location)
    picker.dismiss(animated: true, completion: nil)
}