私は2つのView Controllerを持っています。CardWallet ビュー コントローラーは、私のテーブル ビューです。次に、AddCard ビュー コントローラーに、Card という名前のオブジェクトの新しいインスタンスの値を入力します。これまでのところ、デリゲートを使用して CardWallet View Controller にある myWallet という名前の配列にこれらの Card インスタンスを追加していますが、機能します。
私が欲しいのは、AddCard ビュー コントローラーのボタンをクリックした後、カードの最近追加されたインスタンスに応じた名前で、新しいテーブル セルがカード ウォレット ビューに表示されることです。以下は私のコードです。 Card の新しいインスタンスの追加が完了したときに、テーブルに何も表示されない理由を確認してください。私はいくつかの調査を行い、いくつかのチュートリアルを実行しました。これは良いものです。 . ただし、チュートリアルは、テーブルの値が静的な値を持つ配列からのみ取得されるため、私の主な関心事には対応していません。
ありがとう！
CardWalletViewController.h
#import <UIKit/UIKit.h>
@interface CardWalletViewController : UIViewController <UITableViewDelegate, UITableViewDataSource> {
}
@property (nonatomic, strong) NSMutableArray *myWallet;
-(void) printArrayContents;
@end
CardWalletViewController.m
#import "CardWalletViewController.h"
#import "AddCardViewController.h"
#import "Card.h"
@interface CardWalletViewController () <AddCardDelegate>
@end
@implementation CardWalletViewController
@synthesize myWallet = _myWallet;
- (NSMutableArray *) myWallet
{
if (_myWallet == nil) _myWallet = [[NSMutableArray alloc] init];
return _myWallet;
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:@"showAddCardVC"]) {
AddCardViewController *addCardVC = (AddCardViewController *)segue.destinationViewController;
addCardVC.delegate = self;
}
}
- (void)printArrayContents
{
// I want to show the name of each instance of card
for ( int i = 0; i < self.myWallet.count; i++) {
Card *cardDummy = [self.myWallet objectAtIndex:i];
NSLog(@"Element %i is %@", i,cardDummy.name );
}
}
- (void)addCardViewController:(AddCardViewController *)sender didCreateCard:(Card *)newCard
{
// insert a new card to the array
[self.myWallet addObject:newCard];
[self printArrayContents];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidUnload
{
// Release any retained subviews of the main view.
}
- (void)viewWillAppear:(BOOL)animated
{
}
- (void)viewWillDisappear:(BOOL)animated
{
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
//this method will return the number of rows to be shown
return self.myWallet.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = (UITableViewCell *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
// Configure the cell...
//---------- CELL BACKGROUND IMAGE -----------------------------
UIImageView *imageView = [[UIImageView alloc] initWithFrame:cell.frame];
UIImage *image = [UIImage imageNamed:@"LightGrey.png"];
imageView.image = image;
cell.backgroundView = imageView;
[[cell textLabel] setBackgroundColor:[UIColor clearColor]];
[[cell detailTextLabel] setBackgroundColor:[UIColor clearColor]];
//this will show the name of the card instances stored in the array
//
for ( int i = 0; i < self.myWallet.count; i++) {
Card *cardDummy = [self.myWallet objectAtIndex:i];
cell.textLabel.text = cardDummy.name;
}
//Arrow
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
return cell;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
@end
AddCardViewController.h
#import <UIKit/UIKit.h>
#import "Card.h"
@class AddCardViewController;
@protocol AddCardDelegate <NSObject>
- (void)addCardViewController:(AddCardViewController *)sender
didCreateCard:(Card *) newCard;
@end
@interface AddCardViewController : UIViewController <UITextFieldDelegate>
@property (strong, nonatomic) IBOutlet UITextField *cardNameTextField;
@property (strong, nonatomic) IBOutlet UITextField *pinTextField;
@property (strong, nonatomic) IBOutlet UITextField *pointsTextField;
@property (nonatomic, strong) id <AddCardDelegate> delegate;
@end
AddCardViewController.m
#import "AddCardViewController.h"
#import "Card.h"
#import "CardWalletViewController.h"
@interface AddCardViewController ()
@end
@implementation AddCardViewController
@synthesize cardNameTextField = _cardNameTextField;
@synthesize pinTextField = _pinTextField;
@synthesize pointsTextField = _pointsTextField;
@synthesize delegate = _delegate;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void) viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self.cardNameTextField becomeFirstResponder];
}
- (void) viewWillDisappear:(BOOL)animated
{
}
- (BOOL) textFieldShouldReturn:(UITextField *)textField{
if ([textField.text length]) {
[self.cardNameTextField resignFirstResponder];
[self.pinTextField resignFirstResponder];
[self.pointsTextField resignFirstResponder];
return YES;
}
else {
return NO;
}
}
- (void)viewDidLoad
{
self.cardNameTextField.delegate = self;
self.pinTextField.delegate = self;
self.pointsTextField.delegate = self;
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidUnload
{
[self setCardNameTextField:nil];
[self setPinTextField:nil];
[self setPointsTextField:nil];
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (IBAction)addCard:(id)sender
{
Card *myNewCard = [[Card alloc] init];
myNewCard.name = self.cardNameTextField.text;
myNewCard.pin = self.pinTextField.text;
myNewCard.points = [self.pointsTextField.text intValue];
// to check if the text fields were filled up by the user
if ([self.cardNameTextField.text length] && [self.pinTextField.text length] && [self.pointsTextField.text length])
{
[[self presentingViewController] dismissModalViewControllerAnimated:YES];
NSLog(@"name saved %@", myNewCard.name);
NSLog(@"pin saved %@", myNewCard.pin);
NSLog(@"points saved %i", myNewCard.points);
[self.delegate addCardViewController:self didCreateCard:myNewCard];
// to check if there is a delegate
if (self.delegate){
NSLog(@"delegate is not nil");
}
}
}
@end
カード.h
#import <Foundation/Foundation.h>
@interface Card : NSObject
@property (nonatomic, strong) NSString *name;
@property (nonatomic, strong) NSString *pin;
@property (nonatomic) int points;
@end
カード.m
#import "Card.h"
@implementation Card
@synthesize name = _name;
@synthesize pin = _pin;
@synthesize points = _points;
@end