我有两个表格视图控制器，EmployeeListViewController和EmployeeGroupDetailViewController。
EmployeeListViewController为所选的每个表格单元格发送一个变量_uniqueId到EmployeeGroupDetailViewController，用于查找有关所选员工的详细信息。
问题在于，当我选择一个员工时，一切看起来都很好。但如果我返回（使用“后退”按钮）并选择其他员工，详细信息视图将显示与之前相同的值。
我尝试将一些代码从viewDidLoad()移到viewWillAppear()，但我所做的就是在选择新员工时，详细信息视图会显示以前选择的员工的值，但如果我滚动以便细胞离开视野然后释放，则信息会更新。
为什么详细视图表从一开始就不会更新？
我的EmployeeListViewController.m：
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
// Navigation logic may go here. Create and push another view controller.
if (self.details == nil) {
self.details = [[[EmployeeGroupDetailViewController alloc] initWithNibName:@"EmployeeGroupDetailViewController" bundle:nil] autorelease];
}
// ...
EmployeeInfo *info = [_EmployeeInfos objectAtIndex:indexPath.row];
_details.uniqueId = info.uniqueId;
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:_details animated:YES];
//[EmployeeGroupDetailViewController release];
}
我的EmployeeGroupDetailViewController.m：
//
// EmployeeGroupDetailViewController.m
// Whowho
//
// Created by Carl Franzon on 2012-03-14.
// Copyright (c) 2012 Atea SE. All rights reserved.
//
#import "EmployeeGroupDetailViewController.h"
#import "EmployeeDB.h"
#import "EmployeeDetails.h"
@implementation EmployeeGroupDetailViewController
@synthesize uniqueId = _uniqueId;
@synthesize headerDict = _headerDict;
//@synthesize dicContactInfo = _dicContactInfo;
//@synthesize dicEmploymentInfo = _dicEmploymentInfo;
@synthesize sortedKeys = _sortedKeys;
@synthesize details = _details;
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
//Lookup entry in DB and set labels accordingly
//EmployeeDetails *details = [[EmployeeDB database] EmployeeDetails:_uniqueId];
_details = [[EmployeeDB database] EmployeeDetails:_uniqueId];
//if (details != nil) {
NSArray *arrTemp1 = [[NSArray alloc] initWithObjects:_details.email,_details.shortNo,_details.mobileNo,_details.directNo,nil];
NSArray *arrTemp2 = [[NSArray alloc] initWithObjects:@"Bob",@"Bill",@"Bianca",nil];
NSArray *arrTemp3 = [[NSArray alloc] initWithObjects:@"Candice",@"Clint",@"Chris",nil];
NSDictionary *temp =[[NSDictionary alloc] initWithObjectsAndKeys:arrTemp1,@"A",arrTemp2,@"B",arrTemp3,@"C",nil];
self.headerDict =temp;
[temp release];
self.sortedKeys =[[self.headerDict allKeys] sortedArrayUsingSelector:@selector(compare:)];
[arrTemp1 release];
[arrTemp2 release];
[arrTemp3 release];
// }
// Uncomment the following line to preserve selection between presentations.
// self.clearsSelectionOnViewWillAppear = NO;
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
// self.employeeNoLabel = nil;
// self.nameLabel = nil;
// self.emailLabel = nil;
// self.regionLabel = nil;
// self.officeLabel = nil;
// self.departmentLabel = nil;
// self.locationLabel = nil;
// self.roleLabel = nil;
// self.activeLabel = nil;
// self.workHoursLabel = nil;
// self.managerLabel = nil;
// self.costCentreLabel = nil;
// self.adLabel = nil;
// self.origCompNameLabel = nil;
// self.shortNoLabel = nil;
// self.directNoLabel = nil;
// self.mobileLabel = nil;
// self.sexLabel = nil;
// self.shirtJacketLabel = nil;
// self.pantsLabel = nil;
// self.scgLabel = nil;
// self.tempRoleLabel = nil;
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
//Lookup entry in DB and set labels accordingly
// EmployeeDetails *details2 = [[EmployeeDB database] EmployeeDetails:_uniqueId];
_details = [[EmployeeDB database] EmployeeDetails:_uniqueId];
//if (details != nil) {
NSArray *arrTemp1b = [[NSArray alloc] initWithObjects:_details.email,_details.shortNo,_details.mobileNo,_details.directNo,nil];
NSArray *arrTemp2b = [[NSArray alloc] initWithObjects:@"Bob",@"Bill",@"Bianca",nil];
NSArray *arrTemp3b = [[NSArray alloc] initWithObjects:@"Candice",@"Clint",@"Chris",nil];
NSDictionary *temp =[[NSDictionary alloc] initWithObjectsAndKeys:arrTemp1b,@"A",arrTemp2b,@"B",arrTemp3b,@"C",nil];
self.headerDict =temp;
[temp release];
self.sortedKeys =[[self.headerDict allKeys] sortedArrayUsingSelector:@selector(compare:)];
[arrTemp1b release];
[arrTemp2b release];
[arrTemp3b release];
//}
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
//#warning Potentially incomplete method implementation.
// Return the number of sections.
return [self.sortedKeys count];
}
- (NSString *)tableView:(UITableView *)tableView
titleForHeaderInSection:(NSInteger)section
{
return [self.sortedKeys objectAtIndex:section];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
//#warning Incomplete method implementation.
// Return the number of rows in the section.
NSArray *listData =[self.headerDict objectForKey:
[self.sortedKeys objectAtIndex:section]];
return [listData count];
//return 0;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *SimpleTableIdentifier = @"SimpleTableIdentifier";
NSArray *listData =[self.headerDict objectForKey:
[self.sortedKeys objectAtIndex:[indexPath section]]];
UITableViewCell * cell = [tableView
dequeueReusableCellWithIdentifier: SimpleTableIdentifier];
if(cell == nil) {
//Initialize cell with left lable style
cell = [[[UITableViewCell alloc]
initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:SimpleTableIdentifier] autorelease];
}
NSUInteger row = [indexPath row];
//cell.textLabel.text = @"default";
cell.textLabel.text = [listData objectAtIndex:row];
// static NSString *CellIdentifier = @"Cell";
//
// UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
// if (cell == nil) {
// cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
// }
// Configure the cell...
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
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
*/
/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
*/
/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
// Navigation logic may go here. Create and push another view controller.
/*
<#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil];
// ...
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController release];
*/
NSArray *listData =[self.headerDict objectForKey:
[self.sortedKeys objectAtIndex:[indexPath section]]];
NSUInteger row = [indexPath row];
NSString *rowValue = [listData objectAtIndex:row];
NSString *message = [[NSString alloc] initWithFormat:rowValue];
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:@"You selected"
message:message delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
[alert release];
[message release];
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
- (void)dealloc
{
// self.employeeNoLabel = nil;
// self.nameLabel = nil;
// self.emailLabel = nil;
// self.regionLabel = nil;
// self.officeLabel = nil;
// self.departmentLabel = nil;
// self.locationLabel = nil;
// self.roleLabel = nil;
// self.activeLabel = nil;
// self.workHoursLabel = nil;
// self.managerLabel = nil;
// self.costCentreLabel = nil;
// self.adLabel = nil;
// self.origCompNameLabel = nil;
// self.shortNoLabel = nil;
// self.directNoLabel = nil;
// self.mobileLabel = nil;
// self.sexLabel = nil;
// self.shirtJacketLabel = nil;
// self.pantsLabel = nil;
// self.scgLabel = nil;
// self.tempRoleLabel = nil;
[_headerDict release];
[_sortedKeys release];
[super dealloc];
}
@end
此外，每个新部分的每个部分的行数似乎都没有更新。
答案 0 :(得分：0)
当使用主视图控制器的主详细信息模式在每次选择详细信息项时创建详细视图控制器的新实例时，通常会将该实例的所有权传递给导航控制器。 （实际上，如果你的目标是iOS 5.0+并使用故事板，它就是这样做的，你所做的就是告诉详细视图控制器使用哪个项目。）但是，这并不是造成你的问题的直接原因。
您的详细信息视图控制器会更新其内部数据，以匹配uniqueID（和 viewWillAppear:中设置的viewDidLoad:，因此如果视图已被卸载）。但它没有告诉其表视图更新以反映新数据。调用[self.tableView reloadData]应该这样做。