我刚开始使用Objective-C来编写iPhone应用程序。我读了几本书并用书做了一些项目，但我还不是专家。我试图从UITextField添加一些文本到NSMutableArray，然后在UITableView中显示它。我知道这对你们大多数人来说都是非常基本的东西，但我只是一个初学者。到目前为止，我有两个文件： TableViewController.h：
#import <UIKit/UIKit.h>
@class AddItemViewController;
@interface TableViewController : UITableViewController {
AddItemViewController *addItemViewController;
NSMutableArray *itemsArray;
}
-(IBAction)addNewItem:(id)sender;
@property (nonatomic, retain)NSMutableArray *itemsArray;
@end
TableViewController.m
#import "TableViewController.h"
#import "AddItemViewController.h"
@implementation TableViewController
@synthesize itemsArray;
-(id)init
{
[super initWithStyle:UITableViewStyleGrouped];
itemsArray = [[NSMutableArray alloc] init];
[self setTitle:@"Playing Around"];
UIBarButtonItem *bbi = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addNewItem:)];
[[self navigationItem] setLeftBarButtonItem:bbi];
[bbi release];
return self;
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[[self tableView] reloadData];
}
#pragma mark Actions
-(IBAction)addNewItem:(id)sender
{
addItemViewController = [[AddItemViewController alloc] init];
[UIView beginAnimations:@"animations" context:nil];
[[self navigationController] pushViewController:addItemViewController animated:NO];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.navigationController.view cache:NO];
[UIView setAnimationDuration:0.7];
[UIView commitAnimations];
}
#pragma mark TableView Things
-(NSInteger)tableView:(UITableView*)tableView numberOfRowsInSection:(NSInteger)section
{
return [itemsArray count];
}
-(UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath
{
static NSString *CellIdentifier = @"ItemCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil){
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
[cell autorelease];
}
cell.textLabel.text = [itemsArray objectAtIndex:indexPath.row];
[cell setAccessoryType:UITableViewCellAccessoryDisclosureIndicator];
return cell;
}
- (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.
}
- (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[itemsArray release];
[super dealloc];
}
@end
AddItemViewController.h
#import <UIKit/UIKit.h>
@class TableViewController;
@interface AddItemViewController : UIViewController {
TableViewController *tableViewController;
IBOutlet UITextField *textField;
NSString *value;
}
-(IBAction)cancel:(id)sender;
-(IBAction)create:(id)sender;
@property (nonatomic, copy) NSString *value;
@property (nonatomic, retain)NSMutableArray *itemsArray;
@end
AddItemViewController.m
#import "AddItemViewController.h"
#import "TableViewController.h"
@implementation AddItemViewController
@synthesize value, itemsArray;
-(id)init
{
[self setTitle:@"Add Item"];
UIBarButtonItem *item;
item = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(cancel:)];
[[self navigationItem] setLeftBarButtonItem:item];
[item release];
item = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(create:)];
[[self navigationItem] setRightBarButtonItem:item];
[item release];
return self;
}
-(void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[textField becomeFirstResponder];
}
-(void)viewDidUnload:(BOOL)animated
{
[super viewDidUnload];
[textField release];
textField = nil;
}
#pragma mark Actions
-(IBAction)cancel:(id)sender
{
tableViewController = [[TableViewController alloc] init];
[UIView beginAnimations:@"animations" context:nil];
[[self navigationController] pushViewController:tableViewController animated:NO];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.navigationController.view cache:NO];
[UIView setAnimationDuration:0.7];
[UIView commitAnimations];
}
-(IBAction)create:(id)sender
{
//This is where I get lost
NSString *string = [textField text];
NSLog(@"The string is: %@", string);
[itemsArray addObject:string];
[[tableViewController tableView] reloadData];
NSLog(@"The items are: %@", itemsArray);
tableViewController = [[TableViewController alloc] init];
[UIView beginAnimations:@"animations" context:nil];
[[self navigationController] pushViewController:tableViewController animated:NO];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.navigationController.view cache:NO];
[UIView setAnimationDuration:0.7];
[UIView commitAnimations];
}
- (void)dealloc {
[textField release];
[value release];
[super dealloc];
}
@end
（对不起，我把整件事放在这里，但据我所知，我可能在这方面做错了。） 所以，如果你想跳过大部分的东西，我认为我做得对，只需转到create：方法。
现在该怎么办？我做到了这一点，但当我尝试将其添加到itemsArray时，UITableView中的文本将不会显示。任何提示都会很棒！提前谢谢。