附加到 NSTextView [英] Appending to NSTextView

问题描述

我有一个 NSTask(设置了一个 NSPipe)在后台运行，我想在它们进来时输出内容一个 NSTextView (output).

I've got an NSTask (with an NSPipe set up) running in the background and I want to output the contents, as they're coming in, in an NSTextView (output).

我使用的代码是:

NSMutableAttributedString* str = [[NSMutableAttributedString alloc] initWithString:s];
//[str addAttribute:NSForegroundColorAttributeName value:[NSColor whiteColor] range:NSMakeRange(0, [str length])];

[[output textStorage] appendAttributedString:str];

[output scrollRangeToVisible:NSMakeRange([[output string] length], 0)];

<小时>

问题:

• 当有大量数据附加时，视图看起来像闪烁"...并且无法正常工作.
• 鉴于 NSTextView 位于工作表上，当鼠标指针在其他地方而不是悬停在 NSTextView
上方时，似乎没有任何内容出现
• 为什么会这样，虽然我已经设置了 NSTextView 的颜色/插入颜色/etc，但这似乎不适用于新插入的文本?
• 在 NSTextView 上附加(+滚动) 的建议的方法是什么?

• When there is a lot of data appending, the view seems like "flashing"... and not working properly.
• Given that the NSTextView is on a Sheet, NO CONTENTS seem to be appearing when the mouse pointer is elsewhere other than hovering above the NSTextView
• Why is that, although I've set the color/insertion color/etc of the NSTextView, this doesn't seem to apply to newly inserted text?
• What's the suggested way of appending (+scrolling) on an NSTextView?

谢谢！

推荐答案

请记住，用户界面元素(包括 NSTextView)在主线程上发挥作用.如果您尝试向文本视图添加信息，那么您最好这样做.方法如下:

Remember that user interface elements, and this includes NSTextView, do their magic on the main thread. If you're attempting to add information to the text view, that's where you'd best be doing it. Here's how:

[[output textStorage] performSelectorOnMainThread:@selector(appendAttributedString:) 
                                       withObject:str 
                                    waitUntilDone:YES];

我想解决你的第三点，但坦率地说，我仍然是一个学生.

I'd address your third point, but frankly, that's a thing of which I'm still very much a student.

为了解决您的第四点，您似乎已经弄清楚了；只需结合您的追加和滚动操作.但就像更改 textStorage 的内容一样，您需要确保在主线程上执行此操作.由于 -scrollRangeToVisible: 不接受对象作为其参数，因此您必须以不同的方式执行此操作:

To address your fourth point, it would appear you've got that figured out; just combine your append and scroll actions. But just like changing the contents of textStorage, you want to be sure you're doing this on the main thread. Since -scrollRangeToVisible: doesn't take an object for its argument, you have to do this a bit differently:

dispatch_async(dispatch_get_main_queue(), ^{
    [output scrollRangeToVisible:NSMakeRange([[output string] length], 0)];
});

尽管是我的第一个示例，您也可以在该块内调用 -appendAttributedString::

My first example notwithstanding, you could place your call to -appendAttributedString: inside that block as well:

dispatch_async(dispatch_get_main_queue(), ^{
    [[output textStorage] appendAttributedString:str];
    [output scrollRangeToVisible:NSMakeRange([[output string] length], 0)];
});

这篇关于附加到 NSTextView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！