![[Cocoa]_[初级]_[使用NSOutlineView创建多根显示],第1张](/aiimages/%5BCocoa%5D_%5B%E5%88%9D%E7%BA%A7%5D_%5B%E4%BD%BF%E7%94%A8NSOutlineView%E5%88%9B%E5%BB%BA%E5%A4%9A%E6%A0%B9%E6%98%BE%E7%A4%BA%5D.png "[Cocoa]_[初级]_[使用NSOutlineView创建多根显示],第1张")
场景：主要应用于界面布局中可隐藏数据和展开显示数据。
重点：理解MqjOutlineVIEwDelegate.m文件- (NSTreeNode*) doTreeNodeFromArray:(OutlineVIEwData *) data 函数如何使用递归进行数据封装，
理解+（ID）treeNodeWithRepresentedobject:(ID) modelObject;函数是怎么创建树形结构的
具体例子如下：
1.编写代码
OutlineVIEwData.h
#import <Foundation/Foundation.h>@interface OutlineVIEwData : NSObject{ Nsstring *name; Nsstring *number; //表格状态标识 BOol isHasChild; BOol isParentRoot; NSMutableArray *arrayDatas;}@property (reaDWrite,copy) Nsstring *name;@property (reaDWrite,copy) Nsstring *number;@property (reaDWrite,assign) BOol isHasChild;@property (reaDWrite,assign) BOol isParentRoot;@property (reaDWrite,assign) NSMutableArray *arrayDatas;@end OutlineVIEwData.m
#import "OutlineVIEwData.h"@implementation OutlineVIEwData@synthesize name;@synthesize number;@synthesize isHasChild;@synthesize isParentRoot;@synthesize arrayDatas;-(ID) init{ self =[super init]; name = nil; number =@"0"; isHasChild =NO; isParentRoot =NO; arrayDatas = [NSMutableArray new]; return self;}@end SimpleNodeData.h
#import <Cocoa/Cocoa.h>@interface SimpleNodeData : NSObject {//@private // ivars for the propertIEs declared below Nsstring *name; Nsstring *number; //表格状态标识 BOol isHasChild; BOol isParentRoot; BOol expandable; BOol selectable; BOol container;}@property(reaDWrite,copy) Nsstring *name;@property(reaDWrite,copy) Nsstring *number;@property(reaDWrite,getter=isExpandable) BOol expandable;@property(reaDWrite,getter=isSelectable) BOol selectable;@property(reaDWrite,getter=isContainer) BOol container;@property(reaDWrite,assign) BOol isHasChild;@property(reaDWrite,assign) BOol isParentRoot;-(ID) initWithTreeData:(ID) data;+ (SimpleNodeData *)nodeDataWithTreeData:(ID)data;@end SimpleNodeData.m
#import "SimpleNodeData.h"#import "OutlineVIEwData.h"@implementation SimpleNodeData@synthesize name,number,expandable,selectable,container,isHasChild,isParentRoot;- (ID)init { self = [super init]; name = @"UnTitled"; number =@"0"; expandable = YES; selectable = YES; container = YES; isHasChild =NO; isParentRoot =NO; return self;}-(ID) initWithTreeData:(ID) data{ self = [self init]; OutlineVIEwData *ii =data; name = ii.name; number =ii.number; isHasChild =ii.isHasChild; isParentRoot =ii.isParentRoot; return self;}+ (SimpleNodeData *)nodeDataWithTreeData:(ID)data{ return [[[SimpleNodeData alloc] initWithTreeData:data] autorelease];}- (voID)dealloc { [name release]; [number release]; [super dealloc];}@end MqjOutlineVIEwDelegate.h
#import <Cocoa/Cocoa.h>@interface MqjOutlineVIEwDelegate : NSObject<NSOutlineVIEwDelegate,NSOutlineVIEwDataSource>{ IBOutlet NSTextFIEld *contentLabel; NSTreeNode *roottreeNode; IBOutlet NSOutlineVIEw *outlineVIEw;}- (NSArray *)draggednodes;- (NSArray *)selectednodes;-(voID) onChickTreeCheckBox:(ID) data;@end MqjOutlineVIEwDelegate.m
#import "MqjOutlineVIEwDelegate.h"#import "OutlineVIEwData.h"#import "SimpleNodeData.h"#import "MqjCenterTextFIEldCell.h"@implementation MqjOutlineVIEwDelegate-(voID)awakeFromNib{ OutlineVIEwData *data= [self doloadDataToArray]; roottreeNode =[[self doTreeNodeFromArray:data] retain]; [outlineVIEw setIndentationMarkerFollowsCell:YES]; [outlineVIEw setIgnoresMultiClick:YES]; [outlineVIEw expandItem:roottreeNode expandChildren:YES]; [outlineVIEw reloadData]; //设置子项的展开 // [outlineVIEw isExpandable:[roottreeNode.mutableChildNodes objectAtIndex:0]]; [outlineVIEw expandItem:[roottreeNode.mutableChildNodes objectAtIndex:0] expandChildren:NO];}// The NSOutlineVIEw uses 'nil' to indicate the root item. We return our root tree node for that case.- (NSArray *)childrenForItem:(ID)item { if (item == nil) { return [roottreeNode childNodes]; } else { return [item childNodes]; }}// required methods.- (ID)outlineVIEw:(NSOutlineVIEw *)outlineVIEw child:(NSInteger)index ofItem:(ID)item { // 'item' may potentially be nil for the root item. NSArray *children = [self childrenForItem:item]; // This will return an NSTreeNode with our model object as the representedobject return [children objectAtIndex:index];}- (BOol)outlineVIEw:(NSOutlineVIEw *)outlineVIEw isItemExpandable:(ID)item { // 'item' will always be non-nil. It is an NSTreeNode,since those are always the objects we give NSOutlineVIEw. We access our model object from it. SimpleNodeData *nodeData = [item representedobject]; // We can expand items if the model tells us it is a container return nodeData.container;}- (NSInteger)outlineVIEw:(NSOutlineVIEw *)outlineVIEw numberOfChildrenOfItem:(ID)item { // 'item' may potentially be nil for the root item. NSArray *children = [self childrenForItem:item]; return [children count];}// To get the "group row" look,we implement this method.- (BOol)outlineVIEw:(NSOutlineVIEw *)outlineVIEw isGroupItem:(ID)item { SimpleNodeData *nodeData = [item representedobject]; return NO;}- (BOol)outlineVIEw:(NSOutlineVIEw *)outlineVIEw shouldExpandItem:(ID)item { // query our model for the answer to this question SimpleNodeData *nodeData = [item representedobject]; return nodeData.expandable;}- (voID)outlineVIEw:(NSOutlineVIEw *)outlineVIEw willdisplayCell:(NSCell *)cell fortableColumn:(NStableColumn *)tableColumn item:(ID)item { SimpleNodeData *nodeData = [item representedobject]; // For all the other columns,we don't do anything. Nsstring *IDentifIEr =[tableColumn IDentifIEr]; if ([IDentifIEr isEqualToString:@"name"]) { MqjCenterTextFIEldCell *textCell =(MqjCenterTextFIEldCell*)cell; [textCell setStringValue:nodeData.name]; } else if ([IDentifIEr isEqualToString:@"number"]) { MqjCenterTextFIEldCell *textCell =(MqjCenterTextFIEldCell*)cell; [textCell setStringValue:nodeData.number]; } }- (ID)outlineVIEw:(NSOutlineVIEw *)outlineVIEw objectValueFortableColumn:(NStableColumn *)tableColumn byItem:(ID)item{ ID objectValue = nil; return objectValue;}//表格数据的封装-(OutlineVIEwData*) doloadDataToArray{ OutlineVIEwData *rootData =[OutlineVIEwData new]; [rootData setname:@"root"]; [rootData setIsParentRoot:YES]; for (int i =0; i<5; i++) { OutlineVIEwData *ii =[OutlineVIEwData new]; [ii setname:[Nsstring stringWithFormat:@"parent%d",i+1]]; [ii setNumber:@"8888"]; [ii setIsParentRoot:YES]; if (i<3) { [ii setIsHasChild:YES]; for (int j =0; j<3; j++) { OutlineVIEwData *temp =[OutlineVIEwData new]; [temp setname:[Nsstring stringWithFormat:@"%@-item%d",ii.name,j+1]]; [temp setNumber:@"55"]; [temp setIsHasChild:NO]; [ii.arrayDatas addobject:temp]; } } [rootData.arrayDatas addobject:ii]; } return rootData;}//递归函数填充数据到NSTreeNode对象，构建一个树形目录结构显示多根- (NSTreeNode*) doTreeNodeFromArray:(OutlineVIEwData *) data{ OutlineVIEwData *tempData = data; NSMutableArray *children =tempData.arrayDatas; SimpleNodeData *nodeData = [SimpleNodeData nodeDataWithTreeData:tempData]; // The image for the nodeData is lazily filled in,for performance. // Create a NSTreeNode to wrap our model object. It will hold a cache of things such as the children. NSTreeNode *result = [NSTreeNode treeNodeWithRepresentedobject:nodeData]; // Walk the dictionary and create NSTreeNodes for each child. for (OutlineVIEwData * item in children) { // A particular item can be another dictionary (IE: a container for more children),or a simple string NSTreeNode *childTreeNode; //if ([item isKindOfClass:[OutlineVIEwData class]]) if (item.isHasChild) { // Recursively create the child tree node and add it as a child of this tree node childTreeNode = [self doTreeNodeFromArray:item]; } else { // It is a regular leaf item with just the name SimpleNodeData *childNodeData = [[SimpleNodeData alloc] initWithTreeData:item]; childNodeData.container = NO; childTreeNode = [NSTreeNode treeNodeWithRepresentedobject:childNodeData]; [childNodeData release]; } // Now add the child to this parent tree node [[result mutableChildNodes] addobject:childTreeNode]; } return result;}- (NSArray *)draggednodes { return nil;}- (NSArray *)selectednodes { return [self selectedItems];}- (NSArray *)selectedItems { NSMutableArray *items = [NSMutableArray array]; NSIndexSet *selectedRows = [outlineVIEw selectedRowIndexes]; if (selectedRows != nil) { for (NSInteger row = [selectedRows firstIndex]; row != NSNotFound; row = [selectedRows indexGreaterThanIndex:row]) { [items addobject:[outlineVIEw itemAtRow:row]]; } } return items;}- (voID)outlineVIEwSelectionDIDChange:(NSNotification *)notification{ NSLog(@"click tree"); NSArray *selectednodes = [self selectednodes]; if ([selectednodes count] > 1) { NSLog(@"Multiple Rows Selected"); } else if ([selectednodes count] == 1) { SimpleNodeData *data = [[selectednodes lastObject] representedobject]; NSLog(@"click tree:%@,",data.name); [contentLabel setStringValue:data.name]; } }@end 自定义标签，用于定义表格的NSCell
MqjCenterTextFIEldCell.m
#import "MqjCenterTextFIEldCell.h"@implementation MqjCenterTextFIEldCell- (voID)drawWithFrame:(NSRect)cellFrame inVIEw:(NSVIEw *)controlVIEw{ NSRect rectCenter = cellFrame; NSSize size = [[self Title] sizeWithAttributes:nil]; CGfloat offset = (rectCenter.size.height-size.height)/2; rectCenter.origin.y = rectCenter.origin.y+offset; rectCenter.size.height = cellFrame.size.height-offset; [super drawWithFrame:rectCenter inVIEw:controlVIEw];}@end 3.设置表格列元素的 IDentifIEr
4.设置NSOutlineVIEw对象和NSTextFIEld对象
5.做好以上步骤，运行结果如下：
整个项目代码下载网址：
http://download.csdn.net/detail/moqj_123/9146323
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