如何从NSMutableArray中保存的另一个对象访问NSDocument对象？ [英] How to access NSDocument object from another object held in NSMutableArray?

问题描述

这实际上是如何在NSTableView中显示计算值的扩展？

问题：

我有一个NSDocument类它包含两个属性： text （NSString）和 phrase （NSObject的NSMutableArray与NSString在它们）。
在Doc NIB文件中，我有一个TextView（显示短语），有两列。第一列绑定到一个ArrayController并显示NSString。这工作确定。
我想计算 text 中的NSString出现次数，并显示在第二列中。

我尝试的：

在我的NSObject中定义一个指向TextView的静态var。一旦NIB被加载，它将静态var设置为包含 text 字符串的TextView。

确定如果我打开一个窗口。但是如果我尝试打开多个窗口，静态var将更新与TextView的新实例（从其他窗口）。

如何访问 text 从每个NSObject？换句话说，对象图是NSDocument - （包含一个） - > NSMutableArray - （包含多个） - > NSObject，那么如何从NSObject获取NSDocument？

 <$ c $ 
 c> NSDictionary * entry = [NSDictionary dictionaryWithObjectsAndKeys：
 theP，@phrase，
 theCount，@count，
 nil]; 
 [theArray addObject：entry]; 
  

绑定到 arrangedObjects.phrase 和<$或者，您可以创建一个 Phrase 。c $ c> arrangeObjects.count 。

<包含短语，对文档的引用和计算计数的代码的类。

This is really an extension of How to show calculated values in NSTableView?

The problem:

I have an NSDocument class that contains two properties: text (NSString) and phrases (NSMutableArray of NSObjects with NSString in them). In the Doc NIB file I have a TextView (to display phrases) with two columns. First column is bound to an ArrayController and displays NSString. That works ok. I want to count the number of NSString occurrences in text and display that in the second column.

What I tried:

Define a static var in my NSObject that would point to a TextView. Once the NIB is loaded it would set this static var to a TextView that contains the text string.

This works OK if I open a single window. But if I try opening multiple windows, the static var would get updated with the new instances of TextView (from other windows). Obviously this breaks everything.

Question:

How do I access text from each of the NSObject? In other words, the object diagram is NSDocument --(contains one)--> NSMutableArray --(contains multiple)--> NSObject, so how do I get to NSDocument from NSObject?

解决方案

Instead of an array of strings, use an array of dictionaries:

    NSDictionary *entry = [NSDictionary dictionaryWithObjectsAndKeys:
                                          thePhrase, @"phrase",
                                          theCount, @"count",
                                          nil];
    [theArray addObject:entry];

Bind to arrangedObjects.phrase and arrangedObjects.count.

Alternatively, you could create a Phrase class which contains the phrase, a reference to the document, and code to calculate the count.

这篇关于如何从NSMutableArray中保存的另一个对象访问NSDocument对象？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！