iOS 7的TextKit – 如何插入图像内嵌文本？

我想使用UITextView获得以下效果：

基本上我想插入文字之间的图像。 图像可以简单地占用1行的空间，所以没有必要的包装。

我试着只是添加一个UIView的子视图：

UIView *pictureView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 25, 25)]; [pictureView setBackgroundColor:[UIColor redColor]]; [self.textView addSubview:pictureView]; 

但它似乎浮出了文本，并覆盖它。

我在排除path上做了一些阅读，这似乎是实现这一点的一种方式。 但是，我不想绝对定位图像 – 相反，它应该与文本一样（类似于<span>在HTML中的行为）。

Answer 1

你将需要使用一个属性string，并添加图像作为NSTextAttachment实例：

 NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:@"like after"]; NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init]; textAttachment.image = [UIImage imageNamed:@"whatever.png"]; NSAttributedString *attrStringWithImage = [NSAttributedString attributedStringWithAttachment:textAttachment]; [attributedString replaceCharactersInRange:NSMakeRange(4, 1) withAttributedString:attrStringWithImage]; 

Answer 2

你可以尝试使用NSAttributedString和NSTextAttachment。 看看下面的链接，了解更多关于自定义NSTextAttachment的细节，以便调整图像大小。 http://ossh.com.au/design-and-technology/software-development/implementing-rich-text-with-images-on-os-x-and-ios/

在我的例子中，我调整图像的大小以适应宽度，在您的情况下，您可能需要调整图像的大小以匹配行高。

Answer 3

@ bilobatum的代码转换为Swift为有需要的人：

 var attributedString = NSMutableAttributedString(string: "like after") var textAttachment = NSTextAttachment() textAttachment.image = UIImage(named: "whatever.png") var attrStringWithImage = NSAttributedString.attributedStringWithAttachment(textAttachment) attributedString.replaceCharactersInRange(NSMakeRange(4, 1), withAttributedString: attrStringWithImage) 

Answer 4

扩展@ bilobatum的答案 ，并从另一个问题使用这个类别 。 我做了这个：

用法：

 UILabel *labelWithImage = [UILabel new]; labelWithImage.text = @"Tap [new-button] to make a new thing!"; NSAttributedString *stringWithImage = [labelWithImage.attributedText attributedStringByReplacingOccurancesOfString:@"[new-button]" withImage:[UIImage imageNamed:@"MyNewThingButtonImage"] scale:0]; labelWithImage.attributedText = stringWithImage; 

执行：

 @interface NSMutableAttributedString (InlineImage) - (void)replaceCharactersInRange:(NSRange)range withInlineImage:(UIImage *)inlineImage scale:(CGFloat)inlineImageScale; @end @interface NSAttributedString (InlineImages) - (NSAttributedString *)attributedStringByReplacingOccurancesOfString:(NSString *)string withInlineImage:(UIImage *)inlineImage scale:(CGFloat)inlineImageScale; @end 

。

 @implementation NSMutableAttributedString (InlineImages) - (void)replaceCharactersInRange:(NSRange)range withInlineImage:(UIImage *)inlineImage scale:(CGFloat)inlineImageScale { if (floorf(inlineImageScale) == 0) inlineImageScale = 1.0f; // Create resized, tinted image matching font size and (text) color UIImage *imageMatchingFont = [inlineImage imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate]; { // Font size NSDictionary *attributesForRange = [self attributesAtIndex:range.location effectiveRange:nil]; UIFont *fontForRange = [attributesForRange valueForKey:NSFontAttributeName]; CGSize imageSizeMatchingFontSize = CGSizeMake(inlineImage.size.width * (fontForRange.capHeight / inlineImage.size.height), fontForRange.capHeight); // Some scaling for prettiness CGFloat defaultScale = 1.4f; imageSizeMatchingFontSize = CGSizeMake(imageSizeMatchingFontSize.width * defaultScale, imageSizeMatchingFontSize.height * defaultScale); imageSizeMatchingFontSize = CGSizeMake(imageSizeMatchingFontSize.width * inlineImageScale, imageSizeMatchingFontSize.height * inlineImageScale); imageSizeMatchingFontSize = CGSizeMake(ceilf(imageSizeMatchingFontSize.width), ceilf(imageSizeMatchingFontSize.height)); // Text color UIColor *textColorForRange = [attributesForRange valueForKey:NSForegroundColorAttributeName]; // Make the matching image UIGraphicsBeginImageContextWithOptions(imageSizeMatchingFontSize, NO, 0.0f); [textColorForRange set]; [inlineImage drawInRect:CGRectMake(0 , 0, imageSizeMatchingFontSize.width, imageSizeMatchingFontSize.height)]; imageMatchingFont = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); } // Text attachment with image NSTextAttachment *textAttachment = [NSTextAttachment new]; textAttachment.image = imageMatchingFont; NSAttributedString *imageString = [NSAttributedString attributedStringWithAttachment:textAttachment]; [self replaceCharactersInRange:range withAttributedString:imageString]; } @end @implementation NSAttributedString (InlineImages) - (NSAttributedString *)attributedStringByReplacingOccurancesOfString:(NSString *)string withInlineImage:(UIImage *)inlineImage scale:(CGFloat)inlineImageScale { NSMutableAttributedString *attributedStringWithImages = [self mutableCopy]; [attributedStringWithImages.string enumerateOccurancesOfString:string usingBlock:^(NSRange substringRange, BOOL *stop) { [attributedStringWithImages replaceCharactersInRange:substringRange withInlineImage:inlineImage scale:inlineImageScale]; }]; return [attributedStringWithImages copy]; } @end