我在Tableview中有一个可变数组，这是在从SQLite数据库加载的View中填充的，但是这个数据库会更改，因为它是我应用中产品的收藏夹数据库。 当用户选择tableview中的一个项目（然后用户使用数据库中的信息进入详细视图）时，用户可以选择将其从收藏夹（数据库）中删除，然后用户再按下导航栏，该项目仍然存在，我已经尝试了tableview重新加载视图确实出现，并且会出现视图，但这没有帮助，
任何人都可以对此有所了解吗？
非常感谢， 安德鲁
这是我的代码： FavTableViewController.h：
@interface FavTableViewController : UIViewController <UITableViewDelegate, UITableViewDataSource> {
IBOutlet UITableView *Table;
}
@property (nonatomic, strong) UITableView *Table;
@property (nonatomic, strong) NSArray *cats;
@property (nonatomic, strong) IBOutlet UISearchBar *searchBar;
@property (nonatomic, strong) UISearchDisplayController *searchDisplayController;
@property (nonatomic, strong) NSMutableArray *filteredListContent;
@property (nonatomic, strong) NSMutableArray *listContent;
@property (nonatomic, strong) NSArray *everything;
@property (nonatomic, copy) NSString *savedSearchTerm;
@property (nonatomic) NSInteger savedScopeButtonIndex;
@property (nonatomic) BOOL searchWasActive;
@property (nonatomic, strong) NSString *cellText;
-(void) refresh;
@end
FavTableViewController.m：
#import "FavTableViewController.h"
#import "DBFavAdapter.h"
#import "MenuData.h"
#import "DBAdapter.h"
#import "DetailViewController.h"
#import "ConsoleDetailController.h"
#import "EffectDetailViewController.h"
#import "DimmersDetailController.h"
#import "ConventionalController.h"
#import "ProDetailViewController.h"
@implementation FavTableViewController
@synthesize filteredListContent, savedSearchTerm, savedScopeButtonIndex, searchWasActive, searchBar, searchDisplayController, listContent, everything, cellText, cats, Table;
-(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
listContent = [[NSMutableArray alloc] init];
}
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 {
NSLog(@"Did Load");
[super viewDidLoad];
everything = [[DBFavAdapter allProducts] mutableCopy];
for (NSDictionary *dict in everything) {
[listContent addObject: [dict objectForKey:@"Title"]];
}
// create a filtered list that will contain products for the search results table.
self.filteredListContent = [NSMutableArray arrayWithCapacity:[self.listContent count]];
// restore search settings if they were saved in didReceiveMemoryWarning.
if (self.savedSearchTerm)
{
[self.searchDisplayController setActive:self.searchWasActive];
[self.searchDisplayController.searchBar setSelectedScopeButtonIndex:self.savedScopeButtonIndex];
[self.searchDisplayController.searchBar setText:savedSearchTerm];
self.savedSearchTerm = nil;
}
// [self.tableView reloadData];
self.Table.scrollEnabled = YES;
self.navigationItem.title = @"Favourites";
// cats = [DBFavAdapter allCategories];
}
- (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
self.filteredListContent = nil;
NSLog(@"Unload");
}
- (void)viewWillAppear:(BOOL)animated {
NSLog(@"View will Appear");
[Table reloadData];
NSLog(@"Everything: %@",everything);
NSLog(@"list Content: %@",listContent);
[super viewWillAppear:animated];
}
- (void)viewDidAppear:(BOOL)animated {
NSLog(@"View did Appear");
[super viewDidAppear:animated];
NSLog(@"list Content appeared: %@",listContent);
[Table reloadData];
}
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
}
- (void)viewDidDisappear:(BOOL)animated {
[super viewDidDisappear:animated];
NSLog(@"Did dissapear");
// save the state of the search UI so that it can be restored if the view is re-created
self.searchWasActive = [self.searchDisplayController isActive];
self.savedSearchTerm = [self.searchDisplayController.searchBar text];
self.savedScopeButtonIndex = [self.searchDisplayController.searchBar selectedScopeButtonIndex];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
if(tableView == self.searchDisplayController.searchResultsTableView){
return [self.filteredListContent count];
}
else {
return [self.listContent count];
}
NSLog(@"Rows %i",[self.listContent count]);
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
// NSDictionary *dictionary = [self.tableDataSource objectAtIndex:indexPath.row];
if (tableView == searchDisplayController.searchResultsTableView)
{
cellText = [self.filteredListContent objectAtIndex:indexPath.row];
}
else
{
cellText = [self.listContent objectAtIndex:indexPath.row];
}
// NSString *cellText = [self.listContent objectAtIndex:indexPath.row];
UIFont *cellFont = [UIFont fontWithName:@"Heiti TC" size:17.0];
CGSize constraintSize = CGSizeMake(280.0f, MAXFLOAT);
CGSize labelSize = [cellText sizeWithFont:cellFont constrainedToSize:constraintSize lineBreakMode:UILineBreakModeWordWrap];
return labelSize.height + 30;
}
- (NSInteger)tableView:(UITableView *)tableView indentationLevelForRowAtIndexPath:(NSIndexPath *)indexPath {
NSUInteger row = 1;
return row;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
cell.textLabel.lineBreakMode = UILineBreakModeWordWrap;
cell.textLabel.numberOfLines = 0;
cell.textLabel.font = [UIFont fontWithName:@"Heiti TC" size:17.0];
}
// Configure the cell...
if (tableView == searchDisplayController.searchResultsTableView)
{
cell.textLabel.text = [self.filteredListContent objectAtIndex:indexPath.row];
}
else
{
cell.textLabel.text = [self.listContent objectAtIndex:indexPath.row];
}
return cell;
}
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *selectedItem;
if (tableView == self.searchDisplayController.searchResultsTableView)
{
selectedItem = [self.filteredListContent objectAtIndex:indexPath.row];
}
else
{
selectedItem = [self.listContent objectAtIndex:indexPath.row];
}
// Is the selection a category?
// NSArray *cats = [DBAdapter allCategories];
__block BOOL cat = NO;
[cats enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
if ([(NSString*)obj isEqualToString:selectedItem]) {
cat = YES;
*stop = YES;
}
}];
if (cat) { // the user's selection was a category
// NSLog(@"Selected item was a category");
}
else {
NSArray *mans = [DBAdapter allManufacturers];
__block BOOL man = NO;
[mans enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
if ([(NSString*)obj isEqualToString:selectedItem]) {
man = YES;
*stop = YES;
}
}];
if (man) { // the user's selection was a manufacturer
// NSLog(@"Selected item was a manufacturer");
} else {
// the user's selection was a product
// Find selectedItem in products
__block NSDictionary *selectedRow = nil;
[self.everything enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop)
{
//everything is an array of dictionaries
if ([(NSString*)[(NSDictionary*)obj objectForKey:@"Title"] isEqualToString:selectedItem]) {
selectedRow = (NSDictionary*)obj;
*stop = YES;
}
}];
MenuData *selectionData = [MenuData menuData];
selectionData.manufacturerID = [[selectedRow objectForKey:@"Manufacturer_id"] integerValue];
selectionData.categoryID = [[selectedRow objectForKey:@"Category_id"] integerValue];
selectionData.sCategoryID = [[selectedRow objectForKey:@"SubCategory_id"] integerValue];
selectionData.ssCategoryID = [[selectedRow objectForKey:@"SuperSubCategory_id"] integerValue];
NSString *selectedTitle = [selectedRow objectForKey: @"Title"]; // You probably already have this value from your search. Here for the sake of clarity.
NSDictionary *productDetails = [DBAdapter productDetails: selectedTitle forCurrentData: selectionData];
NSArray *allKeys = [productDetails allKeys];
// NSLog(@"values: %i", [allKeys count]);
for (NSString *key in allKeys) {
id value = [productDetails objectForKey:key];
if ([value isKindOfClass:[NSString class]]) {
// NSLog(@"key: %@ value: %@", key, value);
}
}
NSInteger ViewNumber = [[productDetails objectForKey:@"View"] integerValue];
switch (ViewNumber) {
case 25: {
DetailViewController *dvController = [[DetailViewController alloc] initWithNibName:@"DetailView" bundle:[NSBundle mainBundle]];
dvController.dictionary = productDetails;
[self.navigationController pushViewController:dvController animated:YES];
}
break;
case 18: {
EffectDetailViewController *edvController = [[EffectDetailViewController alloc] initWithNibName:@"EffectDetailView" bundle:[NSBundle mainBundle]];
edvController.dictionary = productDetails;
[self.navigationController pushViewController:edvController animated:YES];
}
break;
case 17: {
ConsoleDetailController *cdvController = [[ConsoleDetailController alloc] initWithNibName:@"ConsoleDetailController" bundle:[NSBundle mainBundle]];
cdvController.dictionary = productDetails;
[self.navigationController pushViewController:cdvController animated:YES];
}
break;
case 2: {
ConsoleDetailController *cdvController = [[ConsoleDetailController alloc] initWithNibName:@"ConsoleDetailController" bundle:[NSBundle mainBundle]];
cdvController.dictionary = productDetails;
[self.navigationController pushViewController:cdvController animated:YES];
}
break;
case 3: {
DimmersDetailController *ddvController = [[DimmersDetailController alloc] initWithNibName:@"DimmersDetailController" bundle:[NSBundle mainBundle]];
ddvController.dictionary = productDetails;
[self.navigationController pushViewController:ddvController animated:YES];
}
break;
case 12: {
ConventionalController *cController = [[ConventionalController alloc] initWithNibName:@"ConventionalController" bundle:[NSBundle mainBundle]];
cController.dictionary = productDetails;
[self.navigationController pushViewController:cController animated:YES];
}
break;
case 5: {
ProDetailViewController *pController = [[ProDetailViewController alloc] initWithNibName:@"ProDetailViewController" bundle:[NSBundle mainBundle]];
pController.dictionary = productDetails;
[self.navigationController pushViewController:pController animated:YES];
}
break;
}
}
}
}
#pragma mark -
#pragma mark Content Filtering
- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope {
/*
Update the filtered array based on the search text and scope.
*/
[self.filteredListContent removeAllObjects]; // First clear the filtered array.
/*
Search the main list for products whose type matches the scope (if selected) and whose name matches searchText; add items that match to the filtered array.
*/
for (NSString *product in listContent)
{
//Edit AD - NS Range works instead of NSComparisonResult
NSRange result = [product rangeOfString:searchText options:(NSCaseInsensitiveSearch|NSDiacriticInsensitiveSearch)];
if (result.location != NSNotFound)
{
[self.filteredListContent addObject:product];
}
/*
// NSComparisonResult result = [product compare:searchText options:(NSCaseInsensitiveSearch|NSDiacriticInsensitiveSearch) range:NSMakeRange(0, [searchText length])];
if (result == NSOrderedSame)
{
[self.filteredListContent addObject:product];
}
*/
}
}
#pragma mark -
#pragma mark UISearchDisplayController Delegate Methods
- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString {
[self filterContentForSearchText:searchString scope:
[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]];
// Return YES to cause the search result table view to be reloaded.
return YES;
}
- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption {
[self filterContentForSearchText:[self.searchDisplayController.searchBar text] scope:
[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:searchOption]];
// Return YES to cause the search result table view to be reloaded.
return YES;
}
- (void)refresh {
NSLog(@"Refresh");
if([NSThread isMainThread])
{
[self.Table reloadData];
[self.Table setNeedsLayout];
[self.Table setNeedsDisplay];
}
else
{
[self performSelectorOnMainThread:@selector(refresh) withObject:nil waitUntilDone:YES];
}
}
@end
答案 0 :(得分：2)
您有2个选项。
listContent中删除该项目。这可以通过delegate方法完成，当您删除项目时，该方法将从子视图控制器调用。viewDidLoad的{{1}}功能从数据库移至listContents。这将导致viewWillAppear再次读取数据库，在删除项目后按下后退按钮，这将在视图首次打开时被调用。