首先将
isShowingList
视为
@property (nonatomic, strong) NSMutableArray *isShowingList;
而要识别先前打开的部分,您需要另一个属性。
@property (nonatomic, assign) NSInteger openSectionIndex;
当您初始化数据(在您的情况下是isShowingList)时,请在重新加载表格之前初始化isShowingList
数组
self.isShowingList = [NSMutableArray array];
if (jsonArray && [jsonArray valueForKey:@"menus"] && [[jsonArray valueForKey:@"menus"] valueForKey:@"menuName"]) {
for (int i = 0; i < [[[jsonArray valueForKey:@"menus"] valueForKey:@"menuName"] count]; i++) {
[self.isShowingList addObject:[NSNumber numberWithBool:NO]];
}
}
并在viewDidLoad()
中初始化openSectionIndex
,像这样:
self.openSectionIndex = NSNotFound;
你的代码应该像这样进行更改
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
if ([[self.isShowingList objectAtIndex:section] boolValue]) {
return [[[[jsonArray valueForKey:@"menus"] valueForKey:@"menuName"] objectAtIndex:section] count];
} else {
return 0;
}
return 0;
}
-(void)headerClicked:(UIGestureRecognizer*)sender {
UILabel *lbl = (UILabel*)sender.view;
NSLog(@"header no : %d", lbl.tag);
if ([[self.isShowingList objectAtIndex:lbl.tag] boolValue]) {
[self closeSection:lbl.tag];
} else {
[self openSection:lbl.tag];
}
}
- (void)openSection:(NSInteger)section {
[self.isShowingList replaceObjectAtIndex:section withObject:[NSNumber numberWithBool:YES]];
NSInteger countOfRowsToInsert = [[[[jsonArray valueForKey:@"menus"] valueForKey:@"menuName"] objectAtIndex:section] count];
NSMutableArray *indexPathsToInsert = [[NSMutableArray alloc] init];
for (NSInteger i = 0; i < countOfRowsToInsert; i++) {
[indexPathsToInsert addObject:[NSIndexPath indexPathForRow:i inSection:section]];
}
NSMutableArray *indexPathsToDelete = [[NSMutableArray alloc] init];
NSInteger previousOpenSectionIndex = self.openSectionIndex;
if (previousOpenSectionIndex != NSNotFound) {
dispatch_async(dispatch_get_main_queue(), ^{
[self.menuTableView reloadSections:[NSIndexSet indexSetWithIndex:previousOpenSectionIndex] withRowAnimation:UITableViewRowAnimationNone];
});
[self.isShowingList replaceObjectAtIndex:previousOpenSectionIndex withObject:[NSNumber numberWithBool:NO]];
NSInteger countOfRowsToDelete = [[[[jsonArray valueForKey:@"menus"] valueForKey:@"menuName"] objectAtIndex:previousOpenSectionIndex] count];
for (NSInteger i = 0; i < countOfRowsToDelete; i++) {
[indexPathsToDelete addObject:[NSIndexPath indexPathForRow:i inSection:previousOpenSectionIndex]];
}
}
[self.menuTableView beginUpdates];
[self.menuTableView insertRowsAtIndexPaths:indexPathsToInsert withRowAnimation:UITableViewRowAnimationAutomatic];
[self.menuTableView deleteRowsAtIndexPaths:indexPathsToDelete withRowAnimation:UITableViewRowAnimationAutomatic];
[self.menuTableView endUpdates];
self.openSectionIndex = section;
}
- (void)closeSection:(NSInteger)section {
[self.isShowingList replaceObjectAtIndex:section withObject:[NSNumber numberWithBool:NO]];
NSInteger countOfRowsToDelete = [self.menuTableView numberOfRowsInSection:section];
if (countOfRowsToDelete > 0) {
NSMutableArray *indexPathsToDelete = [[NSMutableArray alloc] init];
for (NSInteger i = 0; i < countOfRowsToInsert; i++) {
[indexPathsToDelete addObject:[NSIndexPath indexPathForRow:i inSection:section]];
}
[self.menuTableView deleteRowsAtIndexPaths:indexPathsToDelete withRowAnimation:UITableViewRowAnimationTop];
}
self.openSectionIndex = NSNotFound;
}
isShowingList
转换为数组(如果您有可变数量的部分,则可能是可变数组)。然后使用section
作为数组的索引来确定每个部分是否应该展开。您可以通过测试手势识别器视图的标签来确定哪个部分标题被点击。 - pbasdf