【无限互联】IOS开发 阅读器类APP可用开源框架介绍(2)

继续介绍一个有用的TableView中全选单元格的例子，里面的方法可以用在阅读器中用户对阅读内容来源的选择上，如图所示：核心代码如下：[objc]view plaincopy1.- (void)viewDidLoad2.{3. [super viewDidLoad];4.5.//创建表视图 _table6. _table = [[UITableView alloc]initWithFrame:CGRectMake(0, 64, 320, 500) style:UITableViewStylePlain];7. _table.delegate = self;8. _table.dataSource = self;9. [self.view addSubview:_table];10.11.//将字典 "NO"-> @"checked" 装入可变数组中，来控制单元格左边对勾视图12. _contacts = [NSMutableArray array];13.for (int i = 0; i <10; i++) {14.NSMutableDictionary *dic = [NSMutableDictionary dictionary];15. [dic setValue:@"NO" forKey:@"checked"];16. [_contacts addObject:dic];17. }18.19.//创建屏幕左上方的"全选"按钮20. _button = [UIButton buttonWithType:UIButtonTypeRoundedRect];21. [_button setTitle:@"全选" forState:UIControlStateNormal];22. _button.frame = CGRectMake(10, 10, 100, 50);23. [_button addTarget:self action:@selector(allSelect:) forControlEvents:UIControlEventTouchUpInside];24. [self.view addSubview:_button];25.}[objc]view plaincopy1.// 全选按钮的触发事件2.- (void)allSelect:(UIButton*)sender{3.4.//将表视图的所有的单元格放在数组里5.NSArray *anArrayOfIndexPath = [NSArray arrayWithArray:[_table indexPathsForVisibleRows]];6.7.for (int i = 0; i < [anArrayOfIndexPath count]; i++) {8.9.// 得到表视图的indexPath10.NSIndexPath *indexPath= [anArrayOfIndexPath objectAtIndex:i];11.//创建每个单元格，12.LTableViewCell *cell = (LTableViewCell*)[_table cellForRowAtIndexPath:indexPath];13. NSUInteger row = [indexPath row];14.NSMutableDictionary *dic = [_contacts objectAtIndex:row];15.16.// 判断当前按钮的状态是全选还是取消，设置不同的标记17.if ([[[(UIButton*)sender titleLabel] text] isEqualToString:@"全选"]) {18. [dic setObject:@"YES" forKey:@"checked"];19. [cell setChecked:YES];20. }else {21. [dic setObject:@"NO" forKey:@"checked"];22. [cell setChecked:NO];23. }24. }25.26.// 两种状态的切换27.if ([[[(UIButton*)sender titleLabel] text] isEqualToString:@"全选"]){28.for (NSDictionary *dic in _contacts) {29. [dic setValue:@"YES" forKey:@"checked"];30. }31.32. [(UIButton*)sender setTitle:@"取消" forState:UIControlStateNormal];33. }34.35.else{36.for (NSDictionary *dic in _contacts) {37. [dic setValue:@"NO" forKey:@"checked"];38. }39. [(UIButton*)sender setTitle:@"全选" forState:UIControlStateNormal];40. }41.}[objc]view plaincopy1.- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{2.static NSString * identifier = @"Cell";3.4.// 创建单元格5.LTableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:identifier];6.if (cell == nil) {7. cell = [[LTableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];8. }9. NSUInteger row = [indexPath row];10.11.NSMutableDictionary *dic = [_contacts objectAtIndex:row];12.13.14.if ([[dic objectForKey:@"checked"] isEqualToString:@"NO"]) {15. [dic setObject:@"NO" forKey:@"checked"];16. [cell setChecked:NO];17.18. }else {19. [dic setObject:@"YES" forKey:@"checked"];20. [cell setChecked:YES];21. }22.return cell;23.}[objc]view plaincopy1.- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath2.{3. [tableView deselectRowAtIndexPath:indexPath animated:YES];4.5.LTableViewCell *cell = (LTableViewCell*)[tableView cellForRowAtIndexPath:indexPath];6.7. NSUInteger row = [indexPath row];8.9.NSMutableDictionary *dic = [_contacts objectAtIndex:row];10.11.// 创建单元格左边的打钩视图12.if ([[dic objectForKey:@"checked"] isEqualToString:@"NO"]) {13. [dic setObject:@"YES" forKey:@"checked"];14. [cell setChecked:YES];15. }else {16. [dic setObject:@"NO" forKey:@"checked"];17. [cell setChecked:NO];18. }19.}在LTableViewCell中[objc]view plaincopy1.// 用 checked 来判断是否加上对勾视图2.- (void)setChecked:(BOOL)checked{3.4.5.if (checked)6. {7. m_checkImageView.image = [UIImage imageNamed:@"Selected.png"];8.self.backgroundView.backgroundColor = [UIColor colorWithRed:223.0/255.0 green:230.0/255.0 blue:250.0/255.0 alpha:1.0];9. }10.else11. {12. m_checkImageView.image = [UIImage imageNamed:@"Unselected.png"];13.self.backgroundView.backgroundColor = [UIColor whiteColor];14. }15. m_checked = checked;16.17.18.}代码的逻辑简单，通用性强，核心就是用字典来控制对勾视图的显示，对我们以后的视图设计有参考价值。