[Cocoa]_[NSOutlineView]_[多根显示]

来源：互联网发布：明略数据待遇怎么样编辑：程序博客网时间：2024/06/06 19:59

总结下Cocoa下NSOutlineView的使用，要想搞明白NSOutlineView的使用，就要搞懂NSOutlineView的协议的函数的作用，下面结合例子讲解：

1.首先，我们先拖出表格到窗口上，然后给表格的dataSource和delegate绑定一个委托，我们这里直接绑定在AppDelegate上。

2.然后定义一个数据结构来保存每一行的数据，实现如下：

outlineviewData.h

#import <Foundation/Foundation.h>@interface outlineviewData : NSObject{    NSString *name;    NSString *iD;    NSMutableArray *array;    }@property (readwrite,copy) NSString *name;@property (readwrite,copy) NSString *iD;@property (readwrite,copy) NSMutableArray *array;@end

outlineviewData.m

#import "outlineviewData.h"@implementation outlineviewData@synthesize name;@synthesize iD;@synthesize array;-(id)init{    name = nil;    iD = nil;    array = [NSMutableArray new];        return self;}@end

3.在AppDelegate里面实现NSOutlineView的委托和数据的初始化，实现如下：

AppDelegate.h

#import <Cocoa/Cocoa.h>@class outlineviewData;@interface AppDelegate : NSObject <NSApplicationDelegate>{    IBOutlet NSOutlineView *outlineView;    outlineviewData *root;}@property (assign) IBOutlet NSWindow *window;@end

AppDelegate.m

#import "AppDelegate.h"#import "outlineviewData.h"@implementation AppDelegate-(void)awakeFromNib{   // [outlineView setHeaderView:nil];        root = [[outlineviewData alloc] init];        outlineviewData *data = [[outlineviewData alloc] init];    [data setName:@"小泉纯一郎"];    [data setID:@"123"];    [[root array] addObject:data];        outlineviewData *child = [[outlineviewData alloc] init];    [child setName:@"普京"];    [child setID:@"111"];    [[data array] addObject:child];        outlineviewData *data2 = [[outlineviewData alloc] init];    [data2 setName:@"江泽民"];    [data2 setID:@"456"];    [[root array] addObject:data2];        outlineviewData *child2 = [[outlineviewData alloc] init];    [child2 setName:@"奥巴马"];    [child2 setID:@"222"];    [[data2 array] addObject:child2];        [outlineView reloadData];}//-------------------------NSOutlineView protocol----------------------------------//获取表格数据- (id)outlineView:(NSOutlineView *)outlineView child:(NSInteger)index ofItem:(id)item{    if (item == nil) {        return [[root array] objectAtIndex:index];    }    else    {        return [[(outlineviewData *)item array] objectAtIndex:index];    }}//获取表格数据的个数- (NSInteger)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item{  // return [[root mutableChildNodes] count];    NSInteger number = (item == nil) ? [[root array] count] : [[(outlineviewData*)item array] count];    return number;    }//判断能否展开- (BOOL)outlineView:(NSOutlineView *)outlineView isItemExpandable:(id)item{    outlineviewData *data = (outlineviewData *)item;    return [[data array] count];}//判断是否应该展开- (BOOL)outlineView:(NSOutlineView *)outlineView shouldExpandItem:(id)item{    outlineviewData *data = (outlineviewData *)item;    return [[data array] count];}//显示数据到表格上- (void)outlineView:(NSOutlineView *)outlineView willDisplayCell:(id)cell forTableColumn:(NSTableColumn *)tableColumn item:(id)item{    outlineviewData *data = (outlineviewData *)item;    NSString *identifier = [tableColumn identifier];       if ([identifier isEqualToString:@"name"])    {        NSTextFieldCell * textCell = cell;        [textCell setTitle:data.name];    }    else if([identifier isEqualToString:@"id"])    {         NSTextFieldCell * textCell = cell;        [textCell setTitle:data.iD];    }}@end

显示效果：

总结：重点是掌握那几个协议的作用。

代码例子下载链接：http://download.csdn.net/detail/yepeng2014/9149975

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