我正在尝试为列出的对象创建一个带有自定义标头组（父节点）的 NSOutlineVew。（注意：我有基于单元的 NSOutlineView）。例如，它看起来像 Xcode“导航器”或 Numbers 侧边栏。我为每个类别的分离属性使用了默认组，但它看起来不像我想要的。我需要一个父节点（单元格），我可以在视觉上对其进行调整（添加控件元素和图像）。
我试图通过将一组对象传递给 NSDictionary 来做到这一点，为每个组提供一个特定的键。结果，通过 NSLog 一切都正确显示，但是将此变量作为程序 NSoulineView 的源的传输失败。
项目视图控制器.h
@interface ProjectViewController : NSViewController <NSOutlineViewDataSource, NSObject> {
IBOutlet NSOutlineView *outlineView;
FSEntity *content;
}
@property (readonly, assign) NSMutableArray *objects;
@end
项目视图控制器.m
@implementation ProjectViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Initialization code here.
// Setting default path to the local file or directory
NSString *home = NSHomeDirectory();
NSURL *url = [[NSURL alloc] initFileURLWithPath:home];
content = [[FSEntity alloc] initWithURL:url];
[self defineContentNSOutlineView];
NSLog(@"Array: %@",_objects);
// Basic сonfiguration an instance NSOutlineView
[self configurationNSOutlineView];
} return self;
}
@synthesize objects = _objects;
- (id)outlineView:(NSOutlineView *)outlineView child:(NSInteger)index ofItem:(id)item {
return (item == nil) ? [content.children objectAtIndex:index] : [((FSEntity *)item).children objectAtIndex:index];
}
- (BOOL)outlineView:(NSOutlineView *)outlineView isItemExpandable:(id)item {
return (item == nil) ? content.children.count > 0 : ((FSEntity *)item).children.count > 0;
}
- (NSInteger)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item {
return (item == nil) ? content.children.count : ((FSEntity *)item).children.count;
}
- (id)outlineView:(NSOutlineView *)outlineView objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)item {
if ([item isKindOfClass:[FSEntity class]]) {
return [((FSEntity *)item) title];
}
return nil;
}
- (void)outlineView:(NSOutlineView *)outlineView willDisplayCell:(id)cell forTableColumn:(NSTableColumn *)tableColumn item:(id)item {
if ([cell isKindOfClass:[ImageAndTextCell class]]) {
ImageAndTextCell *textField = (ImageAndTextCell *)cell;
[textField setImage:[item icon]];
}
}
- (void)defineContentNSOutlineView {
NSMutableArray *objects = [NSMutableArray arrayWithObjects:[NSDictionary dictionaryWithObjectsAndKeys:@"FINDER", @"title", [NSArray arrayWithObjects:[NSDictionary dictionaryWithObject:content.children forKey:@"title"], nil], @"children",[NSNumber numberWithBool:YES], @"header", nil], nil];
_objects = objects;
}
- (void)configurationNSOutlineView {
[outlineView sizeLastColumnToFit];
[outlineView setFloatsGroupRows:NO];
[outlineView reloadData];
[outlineView expandItem:nil expandChildren:YES];
}
@end
为了更容易想象它的外观，我在计划中展示了它：
+--------------------------------------------+
| ▼ FINDER FILES ₪ ✱ |
| 03143553.file |
| ▶ Desktop |
| ▶ Documents |
| ▶ Downloads |
| ▶ Movies |
| ▶ Music |
| ▶ Pictures |
+--------------------------------------------+
以及我现在拥有的（不使用 NSTreeController 的 NSoulineView）；
+--------------------------------------------+
| 03143553.file |
| ▶ Desktop |
| ▶ Documents |
| ▶ Downloads |
| ▶ Movies |
| ▶ Music |
| ▶ Pictures |
+--------------------------------------------+
我知道示例 Apple“SourceView”，但我不知道如何添加到创建的组、对象数组（文件和文件夹），NSTreeContoller 仅显示层次结构的第一个元素（不包括）：
+--------------------------------------------+
| ▼ FINDER FILES |
| 03143553.file |
| Desktop |
| Documents |
| Downloads |
| Movies |
| Music |
| Pictures |
+--------------------------------------------+
SourceView 示例的修改方法：
- (void)addFinderSection {
[self addFolder:@"FINDER FILES"];
NSError *error = nil;
NSEnumerator *urls = [[[NSFileManager defaultManager] contentsOfDirectoryAtURL:self.url includingPropertiesForKeys:[NSArray arrayWithObjects: nil] options:(NSDirectoryEnumerationSkipsHiddenFiles) error:&error] objectEnumerator];
for (NSURL *url in urls) {
BOOL isDirectory;
if ([[NSFileManager defaultManager] fileExistsAtPath:[url path] isDirectory:&isDirectory]) {
if (isDirectory) {
[self addChild:[url path] withName:NO selectParent:YES];
} else {
[self addChild:[url path] withName:NO selectParent:YES];
}
}
}
[self selectParentFromSelection];
}
此方法仅显示第一个对象，如后一种方案所示。
还有一个问题，正如我之前所说，如何在单元格右侧添加节点**“FINDER FILES”**按钮。
你能帮我解决这个问题吗？我知道，也许不是那么难，但我刚开始学习 Objective-C，我不知道该怎么做。谢谢。