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https://blog.csdn.net/u012951123/article/details/36421939
由于项目须要用到树状列表，能够添加成员变量，于是用了第三方RATreeView开元库，头一次使用，安装github上的使用说明和Demo跑了一下，挺惬意，添加成员什么的都非常easy，和tableview非常像是，可是在处理选择的cell时我纠结了一会，用惯了tableview的index：index.row index.section等。猛然接触到RATreeView处理时，不知道该怎样办了，以下记录的我学习过程，
以下先看下。RATreeView是怎样管理选择这个动作的，方法例如以下：
<span style="font-size:18px;">//Managing Selections
- (id)treeView:(RATreeView *)treeView willSelectRowForItem:(id)item treeNodeInfo:(RATreeNodeInfo *)treeNodeInfo;
- (void)treeView:(RATreeView *)treeView didSelectRowForItem:(id)item treeNodeInfo:(RATreeNodeInfo *)treeNodeInfo;
- (id)treeView:(RATreeView *)treeView willDeselectRowForItem:(id)item treeNodeInfo:(RATreeNodeInfo *)treeNodeInfo;
- (void)treeView:(RATreeView *)treeView didDeselectRowForItem:(id)item treeNodeInfo:(RATreeNodeInfo *)treeNodeInfo;</span>事实上我们实用的信息都存储在treeNodeInfo中。以下我们来分析一下 RATreeNodeInfo
@property (nonatomic, getter = isExpanded, readonly) BOOL expanded; //推断是否展开
@property (nonatomic, readonly) NSInteger treeDepthLevel; //树状展开的深度。也就是层次级别
@property (nonatomic, readonly) NSInteger siblingsNumber;
@property (nonatomic, readonly) NSInteger positionInSiblings; //在每一个层次中。我们选择的单元处于的位置，也就是索引
@property (strong, nonatomic, readonly) RATreeNodeInfo *parent; //我们选择的cell的上一级信息汇总
@property (strong, nonatomic, readonly) NSArray *children; //我们选择的cell 的子类包括的成员数组
@property (strong, nonatomic, readonly) id item;
实用的信息我都已经标出来了。
可能到如今你还混乱则呢。什么是树状结构，什么是层次？以下我们来张图分析一下：
以下通过我项目中的代码片端来分析一下datasource 和delegate 方法的使用方法：
#pragma mark TreeView Delegate methods - (CGFloat)treeView:(RATreeView *)treeView heightForRowForItem:(id)item treeNodeInfo:(RATreeNodeInfo *)treeNodeInfo { return 60;//这里范围单元个的高度。能够单独处理每一个单元格，通过以下就知道怎样单独处理我们想要的了 } - (NSInteger)treeView:(RATreeView *)treeView indentationLevelForRowForItem:(id)item treeNodeInfo:(RATreeNodeInfo *)treeNodeInfo { return 3 * treeNodeInfo.treeDepthLevel; //这个我还没理解。应该是返回我们要使用的文件夹深度。几层吧，我项目中就用到两层，所以没改动 } //这个函数决定 能否够展开。通过设定我们能够设置哪些单元格能够展开到下一层，哪些不能够展开 - (BOOL)treeView:(RATreeView *)treeView shouldExpandItem:(id)item treeNodeInfo:(RATreeNodeInfo *)treeNodeInfo { RADataObject *objc = (RADataObject *)item; if ([objc.name isEqualToString:@"宝贝成员"]) { //事实上，这里的item就是我们点击的单元cell。当中RADataObject不知道的话。建议去下载一下treeView的源代码看看就会明确了 return YES; //事实上我们还能够通过treeNodeInfo来做，由于它包括了我们所须要的全部信息 } return NO; } //这个函数：但我们数据又一次载入时，我们来决定，展开哪个单元。在项目中我的成员列表刷新后，要又一次载入数据，同一时候要展开我的成员列表 - (BOOL)treeView:(RATreeView *)treeView shouldItemBeExpandedAfterDataReload:(id)item treeDepthLevel:(NSInteger)treeDepthLevel { RADataObject *objec = (RADataObject *)item; if ([objec.name isEqualToString:@"宝贝成员"]) { return YES; } return NO; } //这个看字面意识就理解了，在单元格显示之前（或者说将要显示时）我们能够做些设置，这里是设置对应深度的颜色背景 - (void)treeView:(RATreeView *)treeView willDisplayCell:(UITableViewCell *)cell forItem:(id)item treeNodeInfo:(RATreeNodeInfo *)treeNodeInfo { if (treeNodeInfo.treeDepthLevel == 0) { cell.backgroundColor = UIColorFromRGB(0xF7F7F7); } else if (treeNodeInfo.treeDepthLevel == 1) { cell.backgroundColor = UIColorFromRGB(0xD1EEFC); } else if (treeNodeInfo.treeDepthLevel == 2) { cell.backgroundColor = UIColorFromRGB(0xE0F8D8); } } //这里就是我们最熟悉的点击cell处理函数，看代码慢慢体会treeNodeInfo的使用。不想多说了 -(void)treeView:(RATreeView *)treeView didSelectRowForItem:(id)item treeNodeInfo:(RATreeNodeInfo *)treeNodeInfo { NSInteger count = treeNodeInfo.parent.children.count;//你点击的该单元的父节点有多少个成员 NSInteger treeDpthLevelValue = treeNodeInfo.treeDepthLevel; NSInteger positionInSiblingsValue = treeNodeInfo.positionInSiblings; if (treeDpthLevelValue == 0) { if (positionInSiblingsValue == 0 ) { //回到首页 [self.mm_drawerController closeDrawerAnimated:YES completion:nil]; }else if(positionInSiblingsValue == 1){ //不处理 }else if(positionInSiblingsValue == 2){ //进入发烧预警 }else if(positionInSiblingsValue == 3){ //推荐给朋友 }else if(positionInSiblingsValue == 4){ //设置 SettingViewController *setting = [[SettingViewController alloc]initWithNibName:@"SettingViewController" bundle:nil]; [self presentViewController:setting animated:YES completion:nil]; } }else if (treeDpthLevelValue == 1) { if (count == 1) { //进入添加成员设置页面 AddMemberViewController *addVC = [[AddMemberViewController alloc]initWithNibName:@"AddMemberViewController" bundle:nil]; [self presentViewController:addVC animated:YES completion:nil]; }else { if (positionInSiblingsValue == count - 1) { //进入添加成员设置页面 NSLog(@"进入添加成员页面"); //AddMemberViewController *addVC = [[AddMemberViewController alloc]initWithNibName:@"AddMemberViewController" bundle:nil]; [self presentViewController:addVC animated:YES completion:nil]; }else { //设置用户选择的成员标志 self.selectedMemberIndex = positionInSiblingsValue; NSLog(@"用户选择的第 %li 个成员",self.selectedMemberIndex); } } } } #pragma mark TreeView Data Source //数据源处理，相当于UITableViewCell处理，关键还是理解treeNodeInfo概念 - (UITableViewCell *)treeView:(RATreeView *)treeView cellForItem:(id)item treeNodeInfo:(RATreeNodeInfo *)treeNodeInfo { NSInteger numberOfChildren = [treeNodeInfo.children count]; UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"cell"]; // cell.detailTextLabel.text = [NSString stringWithFormat:@"Number of children %d", numberOfChildren]; cell.textLabel.text = ((RADataObject *)item).name; // cell.selectionStyle = UITableViewCellSelectionStyleNone; if (treeNodeInfo.treeDepthLevel == 0) { cell.detailTextLabel.textColor = [UIColor blackColor]; } return cell; } //返回每一层包括成员的个数，来制表 - (NSInteger)treeView:(RATreeView *)treeView numberOfChildrenOfItem:(id)item { if (item == nil) { return [self.data count]; } RADataObject *data = item; return [data.children count]; } //返回对象 - (id)treeView:(RATreeView *)treeView child:(NSInteger)index ofItem:(id)item { RADataObject *data = item; if (item == nil) { return [self.data objectAtIndex:index]; } return [data.children objectAtIndex:index]; } //这里是我想简单、单独说的他们都是delegate方法，可是是用来管理单元cell编辑的，比方删除等 //看各个函数的名字都知道什么意识了，过程能够这么理解：将要開始、运行、运行后 #pragma mark - #pragma mark TreeView Editing //这里决定单元格是否可编辑 -(BOOL)treeView:(RATreeView *)treeView canEditRowForItem:(id)item treeNodeInfo:(RATreeNodeInfo *)treeNodeInfo { return YES; } -(void)treeView:(RATreeView *)treeView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowForItem:(id)item treeNodeInfo:(RATreeNodeInfo *)treeNodeInfo { NSLog(@"self.objcArray == %@",self.objcArray); if (treeNodeInfo.treeDepthLevel == 1) { NSInteger index = treeNodeInfo.positionInSiblings; [self.objcArray removeObjectAtIndex:index]; _willDeleteMember = [self.members objectAtIndex:index];//将要在数据库中删除的成员对象 } _membersObject = [RADataObject dataObjectWithName:@"宝贝成员" children:[self.objcArray copy]]; [self.data replaceObjectAtIndex:1 withObject:_membersObject]; [self.treeView reloadData]; } -(void)treeView:(RATreeView *)treeView willBeginEditingRowForItem:(id)item treeNodeInfo:(RATreeNodeInfo *)treeNodeInfo { NSLog(@"willBeginEditinRow"); } -(void)treeView:(RATreeView *)treeView didEndEditingRowForItem:(id)item treeNodeInfo:(RATreeNodeInfo *)treeNodeInfo { //展开成员列表 //[self.treeView expandRowForItem:treeNodeInfo.parent withRowAnimation:RATreeViewRowAnimationMiddle]; //expands Row //[self.treeView expandRowForItem:item]; NSLog(@"DidEnditing....."); //完毕编辑后。同步数据库：数据库也要删除对应的成员 NSString *path = [self getDBPath]; FMDatabase *membersDB = [FMDatabase databaseWithPath:path]; if (![membersDB open]) { NSLog(@"Failed to open membersDB"); [membersDB close]; } BOOL rs = [membersDB executeUpdate:@"DELETE FROM Member WHERE Name = ?
",_willDeleteMember.name]; if (!rs) { return; } NSLog(@"success delete"); [membersDB close]; }
项目中占时用到这么多，以后会慢慢完好的