首页 > 代码库 > UITableView (4): 在TableView中移动cell和Section 从TableView中删除cell和section
UITableView (4): 在TableView中移动cell和Section 从TableView中删除cell和section
一 .问题:你想用流畅直观的动画来移动和拖拽TableView中的cell和section
方案:
用moveSection:toSection:方法把一个Section移动到新位置.
用moveRowAtIndexPath:toIndexPath:方法把一个cell从当前位置移动到新位置
例子:
创建一个TableView并在其中加载3个Section,每个Section有3个cell
#pragma - mark 初始化数据- (NSMutableArray *)newSectionWithIndex:(NSUInteger)Index withCellCount:(NSUInteger)cellCount{ NSMutableArray *result = [[NSMutableArray alloc]init]; for (NSUInteger counter = 0; counter < cellCount; counter++) { [result addObject:[[NSString alloc]initWithFormat:@"Section %lu Cell %lu",Index,counter + 1]]; } return result;}- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{ self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; //在实例化方法中填充数据 if (self != nil) { _arrayOfSections = [[NSMutableArray alloc]init]; NSMutableArray *section1 = [self newSectionWithIndex:1 withCellCount:3]; NSMutableArray *section2 = [self newSectionWithIndex:2 withCellCount:3]; NSMutableArray *section3 = [self newSectionWithIndex:3 withCellCount:3]; [_arrayOfSections addObject:section1]; [_arrayOfSections addObject:section2]; [_arrayOfSections addObject:section3]; } return self;}
以上功能要实现 ,在AppDelegate中实现
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // Override point for customization after application launch. ViewController *vc = [[ViewController alloc]initWithNibName:nil bundle:nil]; self.window.rootViewController = vc ; return YES;}
然后创建TableView并实现相关协议方法
#pragma mark - 协议方法- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{ return _arrayOfSections.count;}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{ return [[_arrayOfSections objectAtIndex:section]count];}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ UITableViewCell *result = nil; static NSString *cellIdentifier = @"CellIdentifier"; result = [tableView dequeueReusableCellWithIdentifier:cellIdentifier]; if (result == nil) { result = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier]; } result.textLabel.text = [[_arrayOfSections objectAtIndex:indexPath.section]objectAtIndex:indexPath.row]; return result;}
- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. _myTableView = [[UITableView alloc]initWithFrame:self.view.bounds style:UITableViewStyleGrouped]; _myTableView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth; _myTableView.dataSource = self; _myTableView.delegate = self; [self.view addSubview:_myTableView]; NSTimer *timer = [NSTimer timerWithTimeInterval:2.0f target:self selector:@selector(moveSection1ToSection3) userInfo:nil repeats:NO]; [timer fire];}
最后实现section 和 cell 的相关移动 ,功能实现代码如下:
#pragma mark - Section 和 cell 是如何实现移动的//section1 移动到section3- (void)moveSection1ToSection3{ //数据操作 NSMutableArray *section1 = [_arrayOfSections objectAtIndex:0]; [_arrayOfSections removeObject:section1]; [_arrayOfSections addObject:section1]; //TableView移动section [_myTableView moveSection:0 toSection:2]; [self moveCellInSection1ToCell2InSection1];}//同section移动cell- (void)moveCellInSection1ToCell2InSection1{ //数据 NSMutableArray *section1 = [_arrayOfSections objectAtIndex:0]; NSString *cell1InSection1 = [section1 objectAtIndex:0]; [section1 removeObject:cell1InSection1]; [section1 insertObject:cell1InSection1 atIndex:1]; //视图 [_myTableView moveRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0] toIndexPath:[NSIndexPath indexPathForRow:1 inSection:0]]; [self moveCell2InSection1ToCell1InSection2];}//不同section移动cell- (void)moveCell2InSection1ToCell1InSection2{ NSMutableArray *section1 = [_arrayOfSections objectAtIndex:0]; NSMutableArray *section2 = [_arrayOfSections objectAtIndex:1]; NSString *cell2InSection1 = [section1 objectAtIndex:1]; [section1 removeObject:cell2InSection1]; [section2 insertObject:cell2InSection1 atIndex:0]; [_myTableView moveRowAtIndexPath:[NSIndexPath indexPathForRow:1 inSection:0] toIndexPath:[NSIndexPath indexPathForRow:0 inSection:1]];}
二.从TableView中删除cell和section
1.删除section:
首先删除数据源中的section;
然后调用TableView的实例方法deleteSection:withRowAnimation: 第一个参数是NSIndexSet类型,可通过indexSetWithIndex: 来实例化 且indexSetWithIndexesInRange:能
2.删除cell:
首先删除cell对应的数据;
deleteRowsAtIndexPaths:withRowAnimation:
#pragma mark - 删除cell和section//删除section- (void)deleteSection1{ //数据源 [_arrayOfSections removeObjectAtIndex:0]; //然后删除TableView的section NSIndexSet *sectionToDelete = [NSIndexSet indexSetWithIndex:0]; [_myTableView deleteSections:sectionToDelete withRowAnimation:UITableViewRowAnimationAutomatic]; [self deleteCell2InSection3];}//删除cell- (void)deleteCell2InSection3{ NSMutableArray *section3 = [_arrayOfSections objectAtIndex:[_arrayOfSections count]-1]; [section3 removeObjectAtIndex:1]; //添加多个indexPath删除多行 [_myTableView deleteRowsAtIndexPaths:[NSArray arrayWithObjects:[NSIndexPath indexPathForRow:1 inSection:2], nil] withRowAnimation:UITableViewRowAnimationAutomatic];}- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}
UITableView (4): 在TableView中移动cell和Section 从TableView中删除cell和section
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