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我很难拼凑足够的知识片段来实现一个NSOutlineView与NSArray中定义的静态,永不改变的结构。 This link一直很棒,但它并没有帮助我掌握子菜单。我想他们只是嵌套NSArrays,但我没有清楚的想法。实现一个静态NSOutlineView
比方说,我们有一个NSArray内一个NSArray,定义为
NSArray *subarray = [[NSArray alloc] initWithObjects:@"2.1", @"2.2", @"2.3", @"2.4", @"2.5", nil];
NSArray *ovStructure = [[NSArray alloc] initWithObjects:@"1", subarray, @"3", nil];
文本以outlineView定义:objectValueForTableColumn:byItem :.
- (id)outlineView:(NSOutlineView *)ov objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)ovItem
{
if ([[[tableColumn headerCell] stringValue] compare:@"Key"] == NSOrderedSame)
{
// Return the key for this item. First, get the parent array or dictionary.
// If the parent is nil, then that must be root, so we'll get the root
// dictionary.
id parentObject = [ov parentForItem:ovItem] ? [ov parentForItem:ovItem] : ovStructure;
if ([parentObject isKindOfClass:[NSArray class]])
{
// Arrays don't have keys (usually), so we have to use a name
// based on the index of the object.
NSLog([NSString stringWithFormat:@"%@", ovItem]);
//return [NSString stringWithFormat:@"Item %d", [parentObject indexOfObject:ovItem]];
return (NSString *) [ovStructure objectAtIndex:[ovStructure indexOfObject:ovItem]];
}
}
else
{
// Return the value for the key. If this is a string, just return that.
if ([ovItem isKindOfClass:[NSString class]])
{
return ovItem;
}
else if ([ovItem isKindOfClass:[NSDictionary class]])
{
return [NSString stringWithFormat:@"%d items", [ovItem count]];
}
else if ([ovItem isKindOfClass:[NSArray class]])
{
return [NSString stringWithFormat:@"%d items", [ovItem count]];
}
}
return nil;
}
结果是“1”,“(”(可扩展),和“3”。NSLog的显示阵列以“(”,因此第二项。扩展它导致系统崩溃由于去'超越界限“我试着使用parentForItem:。但想不出什么结果来比较
我缺少什么
嵌套属性列表是一个可靠的途径。您通常应该创建并使用模型对象。 http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/ModelObjects/另外,不要看列标题的标题,它应该根据当前的语言而改变(一旦你已经本地化应用程序);改用列标识符。 – 2010-04-19 17:46:31