【发布时间】：2017-04-05 05:31:32
【问题描述】：
请检查代码并告诉我我在这里做错了什么。
TableViewController.m
-(void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
NSManagedObjectContext *context = [self managedObjectContext];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Device" inManagedObjectContext:context];
NSFetchRequest *fetchrequest = [[NSFetchRequest alloc]initWithEntityName:entity];
_devices = [[context executeFetchRequest:fetchrequest error:nil]mutableCopy];
[self.tableView reloadData]; // When TableView is reloading the data in tableview updating according to the data stored via CoreData.
}
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath {
if (fromIndexPath != toIndexPath ) {
NSManagedObjectContext *context = [self managedObjectContext];
NSManagedObject *device = [self.devices objectAtIndex:fromIndexPath.row];
NSString *str1 = [device valueForKey:@"text1"];
NSLog(@"%@",str1);
[self.devices removeObject:device];
[self.devices insertObject:device atIndex:[toIndexPath row]];
// int i = 0;
// for (NSManagedObject *mo in self.devices)
// {
// NSManagedObject *new = [self.devices objectAtIndex:i];
// NSString *check = [new valueForKey:@"text1"];
// NSLog(@"%@",check);
// NSString *check1 = [new valueForKey:@"text2"];
// NSLog(@"%@",check1);
// NSString *check2 = [new valueForKey:@"text3"];
// NSLog(@"%@",check2);
// [mo setValue:[NSString stringWithFormat:@"%@",[new valueForKey:@"text1"]] forKey:@"text1"];
// [mo setValue:[NSString stringWithFormat:@"%@",[new valueForKey:@"text2"]] forKey:@"text2"];
// [mo setValue:[NSString stringWithFormat:@"%@",[new valueForKey:@"text3"]] forKey:@"text3"];
// i++;
// }
NSError *error;
if(![context save:&error]){
NSLog(@"%@ %@",error, [error localizedDescription]);
}
}
}
我有实体名称：设备，列名：text1,text2,text3
我不想对 Core Data 中的数据进行排序，实际上我想移动 TableView 中的行并且我想更新保存在 text1、text2、text3 列中的数据的索引。总的来说，tableview 中有 5 行，我只想更新相对于更新的 tableview 索引的值的索引。
【问题讨论】：
标签： ios objective-c iphone core-data tableview