iOS开发：导航控制器与表格视图的多样化实现

### iOS 开发：导航控制器与表格视图的多样化实现 在 iOS 开发中，导航控制器和表格视图是非常重要的组件。下面将详细介绍如何实现不同功能的表格视图，包括单选列表、带按钮的表格行以及可移动的表格行。 #### 1. 单选列表的实现 在表格视图中，为了实现单选功能，我们需要对选中行添加复选标记，并确保同一时间只有一行被选中。以下是关键代码： ```objc cell.accessoryType = (row == oldRow && lastIndexPath != nil) ? UITableViewCellAccessoryCheckmark : UITableViewCellAccessoryNone; ``` 在 `tableView:didSelectRowAtIndexPath:` 方法中，我们需要处理选中行的切换： ```objc - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { int newRow = [indexPath row]; int oldRow = [lastIndexPath row]; if (newRow != oldRow) { UITableViewCell *newCell = [tableView cellForRowAtIndexPath:indexPath]; newCell.accessoryType = UITableViewCellAccessoryCheckmark; UITableViewCell *oldCell = [tableView cellForRowAtIndexPath:lastIndexPath]; oldCell.accessoryType = UITableViewCellAccessoryNone; lastIndexPath = indexPath; } [tableView deselectRowAtIndexPath:indexPath animated:YES]; } ``` 要将这个单选列表控制器添加到 `BIDFirstLevelController` 中，需要进行以下操作： 1. 导入头文件： ```objc #import "BIDCheckListController.h" ``` 2. 在 `viewDidLoad` 方法中创建并添加控制器实例： ```objc - (void)viewDidLoad { [super viewDidLoad]; self.title = @"First Level"; NSMutableArray *array = [[NSMutableArray alloc] init]; // Disclosure Button BIDDisclosureButtonController *BIDDisclosureButtonController = [[BIDDisclosureButtonController alloc] initWithStyle:UITableViewStylePlain]; BIDDisclosureButtonController.title = @"Disclosure Buttons"; BIDDisclosureButtonController.rowImage = [UIImage imageNamed:@"BIDDisclosureButtonControllerIcon.png"]; [array addObject:BIDDisclosureButtonController]; // Checklist BIDCheckListController *checkListController = [[BIDCheckListController alloc] initWithStyle:UITableViewStylePlain]; checkListController.title = @"Check One"; checkListController.rowImage = [UIImage imageNamed:@"checkmarkControllerIcon.png"]; [array addObject:checkListController]; self.controllers = array; } ``` 保存更改并编译运行，应用程序将显示两个行，点击 “Check One” 行将进入单选列表视图。 #### 2. 带按钮的表格行实现 为了在表格行中添加按钮，我们需要创建一个新的控制器 `BIDRowControlsController`。 首先，在 `BIDRowControlsController.h` 中进行如下修改： ```objc #import "BIDSecondLevelViewController.h" @interface BIDRowControlsController : BIDSecondLevelViewController @property (strong, nonatomic) NSArray *list; - (IBAction)buttonTapped:(id)sender; @end ``` 然后，在 `BIDRowControlsController.m` 中实现具体逻辑： ```objc #import "BIDRowControlsController.h" @implementation BIDRowControlsController @synthesize list; - (IBAction)buttonTapped:(id)sender { UIButton *senderButton = (UIButton *)sender; UITableViewCell *buttonCell = (UITableViewCell *)[senderButton superview]; NSUInteger buttonRow = [[self.tableView indexPathForCell:buttonCell] row]; NSString *buttonTitle = [list objectAtIndex:buttonRow]; UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"You tapped the button" message:[NSString stringWithFormat:@"You tapped the button for %@", buttonTitle] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; } - (void)viewDidLoad { [super viewDidLoad]; NSArray *array = [[NSArray alloc] initWithObjects:@"R2-D2", @"C3PO", @"Tik-Tok", @"Robby", @"Rosie", @"Uniblab", @"Bender", @"Marvin", @"Lt. Commander Data", @"Evil Brother Lore", @"Optimus Prime", @"Tobor", @"HAL", @"Orgasmatron", nil]; self.list = array; } - (void)viewDidUnload { [super viewDidUnload]; self.list = nil; } #pragma mark - #pragma mark Table Data Source Methods - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [list count]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *ControlRowIdentifier = @"ControlRowIdentifier"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ControlRowIdentifier]; if (cell == nil) { cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:ControlRowIdentifier]; UIImage *buttonUpImage = [UIImage imageNamed:@"button_up.png"]; UIImage *buttonDownImage = [UIImage imageNamed:@"button_down.png"]; UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; button.frame = CGRectMake(0.0, 0.0, buttonUpImage.size.width, buttonUpImage.size.height); [button setBackgroundImage:buttonUpImage forState:UIControlS ```