如何维护NSUserDefaults中的单元格select？

https://github.com/lminhtm/LMDropdownView

我怎样才能保存最后select的单元格在NSUserDefault？ 当应用程序重新打开时，应该保持select。

目前，每当应用程序打开时，都会select默认单元格。

- (void)viewDidLoad { [super viewDidLoad]; self.mapTypes = @[@"Standard", @"Satellite", @"Hybrid"]; self.currentMapTypeIndex = 0; self.dropPinButton.layer.cornerRadius = 5; self.removeAllPinsButton.layer.cornerRadius = 5; self.moreButton.layer.cornerRadius = 5; self.moreButton.layer.shadowOffset = CGSizeZero; self.moreButton.layer.shadowOpacity = 0.5; self.moreButton.layer.shadowRadius = 1.0; } - (void)viewDidLayoutSubviews { [super viewDidLayoutSubviews]; self.menuTableView.frame = CGRectMake(CGRectGetMinX(self.menuTableView.frame), CGRectGetMinY(self.menuTableView.frame), CGRectGetWidth(self.view.bounds), MIN(CGRectGetHeight(self.view.bounds) - 50, self.mapTypes.count * 50)); self.moreBottomView.frame = CGRectMake(CGRectGetMinX(self.moreBottomView.frame), CGRectGetMinY(self.moreBottomView.frame), CGRectGetWidth(self.view.bounds), CGRectGetHeight(self.moreBottomView.bounds)); } #pragma mark - DROPDOWN VIEW - (void)showDropDownViewFromDirection:(LMDropdownViewDirection)direction { // Init dropdown view if (!self.dropdownView) { self.dropdownView = [LMDropdownView dropdownView]; self.dropdownView.delegate = self; // Customize Dropdown style self.dropdownView.closedScale = 0.85; self.dropdownView.blurRadius = 5; self.dropdownView.blackMaskAlpha = 0.5; self.dropdownView.animationDuration = 0.5; self.dropdownView.animationBounceHeight = 20; } self.dropdownView.direction = direction; // Show/hide dropdown view if ([self.dropdownView isOpen]) { [self.dropdownView hide]; } else { switch (direction) { case LMDropdownViewDirectionTop: { self.dropdownView.contentBackgroundColor = [UIColor colorWithRed:40.0/255 green:196.0/255 blue:80.0/255 alpha:1]; [self.dropdownView showFromNavigationController:self.navigationController withContentView:_menuTableView]; break; } case LMDropdownViewDirectionBottom: { self.dropdownView.contentBackgroundColor = [UIColor whiteColor]; CGPoint origin = CGPointMake(0, CGRectGetHeight(self.navigationController.view.bounds) - CGRectGetHeight(self.moreBottomView.bounds)); [self.dropdownView showInView:self.navigationController.view withContentView:self.moreBottomView atOrigin:origin]; break; } default: break; } } } - (void)dropdownViewWillShow:(LMDropdownView *)dropdownView { NSLog(@"Dropdown view will show"); } - (void)dropdownViewDidShow:(LMDropdownView *)dropdownView { NSLog(@"Dropdown view did show"); } - (void)dropdownViewWillHide:(LMDropdownView *)dropdownView { NSLog(@"Dropdown view will hide"); } - (void)dropdownViewDidHide:(LMDropdownView *)dropdownView { NSLog(@"Dropdown view did hide"); switch (self.currentMapTypeIndex) { case 0: self.mapView.mapType = MKMapTypeStandard; break; case 1: self.mapView.mapType = MKMapTypeSatellite; break; case 2: self.mapView.mapType = MKMapTypeHybrid; break; default: break; } } #pragma mark - MENU TABLE VIEW - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [self.mapTypes count]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { LMMenuCell *cell = [tableView dequeueReusableCellWithIdentifier:@"menuCell"]; if (!cell) { cell = [[LMMenuCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"menuCell"]; } cell.menuItemLabel.text = [self.mapTypes objectAtIndex:indexPath.row]; cell.selectedMarkView.hidden = (indexPath.row != self.currentMapTypeIndex); return cell; } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { [tableView deselectRowAtIndexPath:indexPath animated:NO]; self.currentMapTypeIndex = indexPath.row; [self.dropdownView hide]; } #pragma mark - MAP VIEW DELEGATE - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation { MKPinAnnotationView *pinAnnotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"current"]; pinAnnotationView.animatesDrop = YES; pinAnnotationView.canShowCallout = YES; pinAnnotationView.pinColor = MKPinAnnotationColorGreen; return pinAnnotationView; } #pragma mark - EVENTS - (IBAction)titleButtonTapped:(id)sender { [self.menuTableView reloadData]; [self showDropDownViewFromDirection:LMDropdownViewDirectionTop]; } - (IBAction)moreButtonTapped:(id)sender { [self showDropDownViewFromDirection:LMDropdownViewDirectionBottom]; } - (IBAction)removeAllPinsButtonTapped:(id)sender { [self.dropdownView hide]; dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(self.dropdownView.animationDuration * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ [self.mapView removeAnnotations:self.mapView.annotations]; }); } - (IBAction)dropPinButtonTapped:(id)sender { [self.dropdownView hide]; dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(self.dropdownView.animationDuration * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ MKPointAnnotation *point = [[MKPointAnnotation alloc] init]; point.coordinate = [self.mapView convertPoint:self.mapView.center toCoordinateFromView:self.mapView]; point.title = @"LMDropdownView"; [self.mapView addAnnotation:point]; }); } 

Answer 1

你在didSelectRowAtIndexPath得到select的索引，存储在userdefaults中

 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { [tableView deselectRowAtIndexPath:indexPath animated:NO]; self.currentMapTypeIndex = indexPath.row; [[NSUserDefaults standardUserDefaults] setInteger:self.currentMapTypeIndex forKey:@"selected_map_type"]; [[NSUserDefaults standardUserDefaults]synchronize]; [self.dropdownView hide]; } 

检索它..在viewDidLoad

 - (void)viewDidLoad { [super viewDidLoad]; self.mapTypes = @[@"Standard", @"Satellite", @"Hybrid"]; self.currentMapTypeIndex= [[[NSUserDefaults standardUserDefaults] valueForKey:@"selected_map_type"]integerValue] ? [[[NSUserDefaults standardUserDefaults] valueForKey:@"selected_map_type"]integerValue] : 0; // ... continue with your code ... }