如何将UILabel转为UIImage，并解决模糊的问题。

开发一个需求，需要实现这种效果

image.png

其中直播标签我用了UILabel画出来，并想将其作为一个字符加入到整个title中去排版，但后来才发现属性字符串是不支持加入UIView进行排版的，只可以加UIImage，所以就想办法把UILabel转为UIImage。

UILabel转UIImage的代码如下：
因为下面注释掉的代码会导致标签模糊，后改用上边的代码解决了问题。

- (UIImage*)imageWithUIView:(UIView*) view
{
    UIGraphicsBeginImageContextWithOptions(view.size, NO, 0.0f);
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    [view.layer renderInContext:ctx];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;

    // 下面这段代码会模糊。
//    UIGraphicsBeginImageContext(view.bounds.size);
//    CGContextRef ctx = UIGraphicsGetCurrentContext();
//    [view.layer renderInContext:ctx];
//    UIImage* tImage = UIGraphicsGetImageFromCurrentImageContext();
//    UIGraphicsEndImageContext();
//    return tImage;
}

属性字符串:

        UIImage *img = [self imageWithUIView:self.liveTag];
        NSMutableAttributedString *attrStr = [[NSMutableAttributedString alloc] initWithString:title];
        // 图片：置顶
        NSTextAttachment *stickAttach = [[NSTextAttachment alloc] init];
        stickAttach.image = img;
        CGFloat lineHeight = self.titleLabel.font.lineHeight;
        CGFloat descender = self.titleLabel.font.descender;
        CGFloat realWidth = 30.0f;
        CGFloat realHeight = 18.0f;
        stickAttach.bounds = CGRectMake(0, descender + (lineHeight - realHeight) / 2, realWidth, realHeight);
        NSAttributedString *attachmentAttrStr = [NSAttributedString attributedStringWithAttachment:stickAttach];
        [attrStr insertAttributedString:attachmentAttrStr atIndex:0];
         
        // 图片与文字的间距
        [attrStr insertAttributedString:[[NSAttributedString alloc] initWithString:@" "] atIndex:1];
           
        self.titleLabel.attributedText = attrStr;