objective-c – Aaron Hillegass _适用于Mac OS X的编程_第9章问题

概述在Aaron Hillegass的“Mac OS X可可编程”第9章“插入时开始编辑”一节中,他解释了如何做到这一点.但让我感到困惑的是,他做了很多其他事情.这是完整的代码清单： - (IBAction)createEmployee:(id)sender{NSWindow *w = [tableView window];// Try to end any editing that is t 在Aaron Hillegass的“Mac OS X可可编程”第9章“插入时开始编辑”一节中,他解释了如何做到这一点.但让我感到困惑的是,他做了很多其他事情.这是完整的代码清单：

- (IBAction)createEmployee:(ID)sender{NSWindow *w = [tableVIEw window];// Try to end any editing that is taking placeBOol editingEnded = [w makeFirstResponder:w];if (!editingEnded) {    NSLog(@"Unable to end editing");    return;}NSUndoManager *undo = [self undoManager];// Has an edit occurred already in this event?if ([undo grouPingLevel]) {    // Close the last group    [undo endUndoGrouPing];    // Open a new group    [undo beginUndoGrouPing];}// Create the objectPerson *p = [employeeController newObject];// Add it to the content array of 'employeeController'[employeeController addobject:p];[p release];// Re-sort (in case the user has sorted a column)[employeeController rearrangeObjects];// Get the sorted arrayNSArray *a = [employeeController arrangedobjects];// Find the object just addedint row = [a indexOfObjectIDenticalTo:p];NSLog(@"starting edit of %@ in row %d",p,row);// Begin the edit in the first column[tableVIEw editColumn:0                  row:row            withEvent:nil               select:YES];}

我有两个问题：

1)你怎么知道你应该做所有这些事情？ Apple的文档中是否有“清单”或其他内容？经验？

2)如果您还必须自己重写所有方法,这是否会破坏阵列控制器的整个目的？

编辑：我主要想知道他是如何知道的那样：(因为其他一切都非常基本且明显)

NSWindow *w = [tableVIEw window];// Try to end any editing that is taking placeBOol editingEnded = [w makeFirstResponder:w];if (!editingEnded) {    NSLog(@"Unable to end editing");    return;}NSUndoManager *undo = [self undoManager];// Has an edit occurred already in this event?if ([undo grouPingLevel]) {    // Close the last group    [undo endUndoGrouPing];    // Open a new group    [undo beginUndoGrouPing];}

解决方法

1) How do you kNow you’re supposed to do all that stuff? Is there a ‘checkList’ or something in Apple’s doc? ExperIEnce?

你是对的,大多数人做初始实现都不会出现这种代码. (我猜这就是为什么它出现在书中.你可以从Aaron的经验中受益).

该代码将是一个或多个错误报告的结果.换句话说,你最初不会想出那个代码,但最终你会想到.

亲自试试吧.删除该代码,然后查看是否可以发现正在运行的应用程序中的问题.解决这些问题需要结合使用SDK知识和调试技巧.两者都有经验增长.

2) Doesn’t this defeat the whole purpose of an array controller if you’re having to still rewrite all the methods on your own?

有人可能会说,像这样修改tablevIEw的行为的能力是数组控制器的全部要点(作为应用程序设计的一个元素).

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