在从Xcode中的多个文本字段保存数据的问题

我是Xcode的新手，所以我对任何明显的错误表示歉意。

我正在构build一个简单的应用程序，其中包括使用NSUserDefaults保存来自多个文本字段的数据，并将其填充到表视图中。

第一个文本字段（tField）保存得很好（也用于填充表格视图，也工作正常）。 我试图包括第二个（tField2），它不是在input时将数据保存到正确的位置，现在代码实际上将数据从第一个字段保存到第二个字段，并删除input到第二个字段中的数据。

这里有一些代码，我认为最好的风险包括太多而不是太less。 如果需要，我会提供更多信息，非常感谢！

Appdelegate.m

#import "AppDelegate.h" #import "Data.h" @implementation AppDelegate - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // Override point for customization after application launch. [Data getAllNotes]; return YES; } 

Masterview.m

 #import "MasterViewController.h" #import "DetailViewController.h" #import "Data.h" @interface MasterViewController () { NSMutableArray *_objects; } @end @implementation MasterViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. self.navigationItem.leftBarButtonItem = self.editButtonItem; UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(insertNewObject:)]; self.navigationItem.rightBarButtonItem = addButton; } -(void)viewWillAppear:(BOOL)animated { ///This ensures the re-generation of list items in Table View after new saves or edits. [super viewWillAppear:animated]; [self makeObjects]; [self.tableView reloadData]; } -(void)makeObjects { ///This ensures list is generated in order of creation date & time. _objects = [NSMutableArray arrayWithArray:[[Data getAllNotes] allKeys]]; [_objects sortUsingComparator:^NSComparisonResult(id obj1, id obj2) { return [(NSDate *)obj2 compare:(NSDate *)obj1]; }]; } - (void)insertNewObject:(id)sender { [self makeObjects]; NSString *key = [[NSDate date] description]; [Data setNote:kDefaultText forKey:key]; [Data setCurrentKey:key]; [_objects insertObject:key atIndex:0]; NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0]; [self.tableView insertRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic]; ///Enables transition to Detail View when New Object is created. [self performSegueWithIdentifier:kDetailView sender:self]; } #pragma mark - Table View - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return _objects.count; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath]; NSDate *object = _objects[indexPath.row]; ///This determines which data is used to generate cell title in Table View. cell.textLabel.text = [[Data getAllNotes] objectForKey:[object description]]; return cell; } - (void)tableView:(UITableView *)tableView commitEditingStyle: (UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { if (editingStyle == UITableViewCellEditingStyleDelete) { ///This controls Editing Style of how Notes are deleted. [Data removeNoteForKey:[_objects objectAtIndex:indexPath.row]]; [Data saveNotes]; [_objects removeObjectAtIndex:indexPath.row]; [tableView deleteRowsAtIndexPaths:@[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. } } 

Detailview.h

 #import <UIKit/UIKit.h> @interface DetailViewController : UIViewController @property (strong, nonatomic) id detailItem; ///This links UI elements to code. @property (weak, nonatomic) IBOutlet UITextField *tField; ///Edited from original to include price field. @property (weak, nonatomic) IBOutlet UITextField *tField2; @end 

Detailview.m

 @synthesize tField; ///Edited from original to include price field. @synthesize tField2; #pragma mark - Managing the detail item - (void)setDetailItem:(id)newDetailItem { if (_detailItem != newDetailItem) { _detailItem = newDetailItem; [Data setCurrentKey:_detailItem]; // Update the view. [self configureView]; } } - (void)configureView { NSString *currentNote = [[Data getAllNotes] objectForKey:[Data getCurrentKey]]; if (![currentNote isEqualToString:kDefaultText]) { self.tField.text = currentNote; } else { self.tField.text = @""; } ///Edited from original. (Result: saves data from field1 in field2) NSString *currentNote2 = [[Data getAllNotes] objectForKey:[Data getCurrentKey]]; if (![currentNote2 isEqualToString:kDefaultText]) { self.tField2.text = currentNote2; } else { self.tField2.text = @""; } ///This is what initalizes keyboard upon entry. [self.tField becomeFirstResponder]; } -(void)viewWillDisappear:(BOOL)animated { if (![self.tField.text isEqualToString:@""]) { [Data setNoteForCurrentKey:self.tField.text]; } else { [Data removeNoteForKey:[Data getCurrentKey]]; } [Data saveNotes]; } 

Answer 1

你的viewWillAppear只保存第一个数据。

 -(void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; if (![self.tField.text isEqualToString:@""]) { //SET THE CURRENT KEY HERE [Data setNoteForCurrentKey:self.tField.text]; } else { //SET THE CURRENT KEY HERE [Data removeNoteForKey:[Data getCurrentKey]]; } if (![self.tField2.text isEqualToString:@""]) { //SET THE CURRENT KEY HERE [Data setNoteForCurrentKey:self.tField2.text]; } else { //SET THE CURRENT KEY HERE [Data removeNoteForKey:[Data getCurrentKey]]; } [Data saveNotes]; } 

还有只有一个细节项目的问题。 这意味着你只有一个指向第二个项目的指针（它将保持你当前的笔记为了解决这个问题，你需要有两个detailItem属性（一个用于第一个音符和一个第二个），然后，当你保存注意，设置适当的一个变得活跃。