我使用NSMutableDictionary来填充我的UITableView,它运行得很好。但是,我想删除行,然后我必须在调用-reloadData方法之前从Dictionary中删除目标单元格。
我很难找到NSMutableDictionary中的正确对象并删除它。我将发布以下结构。
country = [
{
citys = [
{
id = 4;
cityName = New York;
},
{
id = 5;
cityName = LA;
}
];
id = 2;
countryName = US;
},
{
citys = [
{
id = 21;
cityName = Oslo;
}
];
id = 31;
countryName = Norway;
}
];
我使用“countryName”值作为标题部分名称。所以,我知道已被挖掘的单元格,我如何在数组中找到该对象并将其删除。
答案 0 :(得分:1)
希望你不介意,如果我为你写一些代码。不要只是复制和粘贴它。试着了解它的方式。因此,您可以在将来解决此类要求。
我将您的数据放在plist
中,然后将其提取到NSMutableDictionary
,然后将其提取到NSMutableArray
。
// In the viewDidLoad: method
NSMutableDictionary *plistData = [NSMutableDictionary dictionaryWithContentsOfFile:[[NSBundle mainBundle]pathForResource:@"Countries" ofType:@"plist"]];
sectionedArray = [plistData objectForKey:@"Country"];
然后是以下tableView
方法。
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return [sectionedArray count];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
NSMutableArray *array = [[sectionedArray objectAtIndex:section] objectForKey:@"citys"];
return [array count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleValue2 reuseIdentifier:CellIdentifier];;
}
// Configure the cell...
NSMutableArray *array = [[sectionedArray objectAtIndex:indexPath.section] objectForKey:@"citys"];
NSDictionary *dict = [array objectAtIndex:indexPath.row];
cell.textLabel.text = [dict valueForKey:@"cityName"];
return cell;
}
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the specified item to be editable.
return YES;
}
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source
NSMutableArray *array = [[sectionedArray objectAtIndex:indexPath.section] objectForKey:@"citys"];
[array removeObjectAtIndex:indexPath.row];
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
NSLog(@"Sectioned array %@", sectionedArray);
}
}
答案 1 :(得分:0)
使用新的Objective-C Literals语法:
// NSInteger section, row;
NSDictionary *countryData = country[section];
NSMutableArray *cityData = countryData[@"citys"];
[cityData removeObjectAtIndex:row];
(注意,它的价值是什么: city 的英文复数是 cities 。)