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//右按钮点击事件 - (void)barButtonItemClicked{ //创建数据 int randomName = arc4random() %300 +160000; NSArray *cityArray = @[@"上海",@"天津",@"北京",@"郑州",@"广州"]; int randomCity = arc4random() %5; NSString *cityStr = [cityArray objectAtIndex:randomCity]; NSDate *date = [NSDate date]; NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; [formatter setDateFormat:@"YYYY-MM-dd hh:mm:ss"]; NSString *time = [formatter stringFromDate:date]; //创建实体 Classes *classes = [NSEntityDescription insertNewObjectForEntityForName:@"Classes" inManagedObjectContext:self.managedContext]; //属性 classes.classessName = [NSString stringWithFormat:@"BJS%d",randomName]; classes.classessCity = cityStr; classes.classessTime = time; classes.classessImage = @"12.jpg"; [_managedContext save:nil]; [self.dataArray addObject:classes]; [self.tableView reloadData]; }
删除对象
#pragma mark - 设置所有cell可编辑
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
return YES;
}
#pragma mark -编辑样式
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath {
return UITableViewCellEditingStyleDelete;
}
#pragma mark - 完成并提交
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
Classes *model = self.dataArray[indexPath.row];
[self.managedContext deleteObject:model];
NSError *error = nil;
[self.managedContext save:&error];
if (error == nil) {
[self.dataArray removeObject:model];
[self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
}
}
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原文地址：http://www.cnblogs.com/mingjieLove00/p/5495498.html
