YYText 富文本编辑

用YYText做富文本编辑开发实在是坑点太多.

1. YYTextView中没有做异步渲染,导致超长文本输入特别卡,而且如果有图文的长篇内容无法渲染.

2. yytext中内容本地化,(将富文本转为data)必须在主线程中处理.比如里面的图片<UIImageView>和增加的其他富文本View初始化就必须在主线程中处.

YYLabel 异步渲染

    _label = [YYLabel new];
    _label.displaysAsynchronously = YES; //开启异步绘制
    _label.ignoreCommonProperties = YES;
    _label.numberOfLines = 2;
    _label.font = FontRegular(14);
    _label.lineBreakMode = NSLineBreakByTruncatingTail;
    _label.userInteractionEnabled = YES;

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        // 创建文本容器
        YYTextContainer *container = [YYTextContainer new];
        container.size = CGSizeMake(ScreenWidth - 90, CGFLOAT_MAX);
        container.maximumNumberOfRows = 2;
        
        // 生成排版结果
        YYTextLayout *layout = [YYTextLayout layoutWithContainer:container text:likeItemModel.likesStr];
        YYTextBorder *border = [[YYTextBorder alloc]init];
        border.insets = UIEdgeInsetsMake(-2, 0, -2, 0);
        border.cornerRadius = 3;
        border.fillColor = [UIColor clearColor];

        dispatch_async(dispatch_get_main_queue(), ^{
            _label.size = layout.textBoundingSize;
            _label.textLayout = layout;
        });
    });