从父视图控制器传递UITextView值到ModalViewController

Question

我一直在为iPad的校报应用程序工作。我终于能够解析我需要的文章。我用UITextView将每篇文章摘要放在父视图控制器上。现在我想要做的是当按下UITextView顶部的自定义按钮时，用ModalViewController显示每篇文章。我通过StackOverFlow中的几个QA来查看，但无法让我的项目工作。我将在这里放置一些代码，并在控制台上添加一些日志。任何帮助将不胜感激。提前致谢。

以我ArticleViewController.h（这是一样的ModalViewController.h）

@interface ArticleViewController : UIViewController { 

    IBOutlet UIButton *doneReadingButton; 
    IBOutlet UITextView *articleTextView; 
} 

@property (nonatomic, retain) UIButton *doneReadingButton; 
@property (nonatomic, retain) UITextView *articleTextView; 

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil withText:(NSString *)text; 

-(IBAction)doneReadingArticle:(id)sender; 
//-(IBAction)displayArticleView:(id)sender; 

@end 

以我ArticleViewController.m（同ModalViewController.m）

#import "ArticleViewController.h" 


@implementation ArticleViewController 

@synthesize doneReadingButton; 
@synthesize articleTextView; 

- (IBAction)doneReadingArticle:(id)sender { 
    [self dismissModalViewControllerAnimated:YES]; 
} 

//This is where I need to display main article in modal view 
/* 
- (IBAction)displayArticleView:(id)sender { 
[self presentModalViewController:articleTextView animated:YES]; 
} 
*/ 



// The designated initializer. Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad. 
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil withText:(NSString *)text { 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     // Custom initialization. 
     //self.articleTextView = [[UITextView alloc] init]; 
     //self.articleTextView.text = [text retain]; 
     self.articleTextView.text = text; 
    } 

    NSLog(@"********text in modal init******** >> %@",articleTextView.text); 
    return self; 
} 



    // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. 
- (void)viewDidLoad { 
    [super viewDidLoad]; 

    //I guess, this is where I have to load main article 
    self.articleTextView.text = @"This is a test!"; 

    NSLog(@"********text in modal******** >> %@",articleTextView.text); 
} 

以我父视图控制器

-(IBAction)articleView04:(id)sender{ 
    storyView04 = [[ArticleViewController alloc] initWithNibName:@"ArticleViewController" bundle:[NSBundle mainBundle]]; 

    storyView04.articleTextView.text =[NSString stringWithString:@"TESTING! TESTING!"]; 
    [storyView04 setModalTransitionStyle:UIModalTransitionStyleCrossDissolve]; 
    storyView04.modalPresentationStyle = UIModalPresentationPageSheet; 
    [self presentModalViewController:storyView04 animated:YES]; 
    [storyView04 release]; 
} 

所以，在控制台中，我刚刚得到这个，这只是一个占位符的文本。

2011-05-28 15:44:00.071 TheCalAggie[4179:207] ********text in modal******** >> This is a test! 

我知道我必须从父视图ModalViewController传递文本值，但我不知道如果我正确地传递。我的代码起初是否有意义？

反正。请帮助我完成这个项目。我真的必须在一周内完成。再次感谢。

Answer 1

这里是我会做什么（从我目前的项目采取）：

#import <UIKit/UIKit.h> 


@interface DictionaryViewController : UIViewController { 
    NSString *word; 
    NSString *definition; 
    IBOutlet UIWebView *webView; 
    IBOutlet UINavigationItem *navItem; 
} 

@property(nonatomic, copy) NSString *word; 
@property(nonatomic, copy) NSString *definition; 
@property(nonatomic, retain) IBOutlet UIWebView *webView; 
@property(nonatomic, retain) IBOutlet UINavigationItem *navItem; 

-(IBAction) done; 
-(IBAction) pronounce; 

@end 

下面是执行：

#import "DictionaryViewController.h" 
#import "TBXML.h" 
#import "Lexicontext.h" 
#import "Lexicontext+Pronounce.h" 

@implementation DictionaryViewController 

@synthesize word, definition, webView, navItem; 

-(void) observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context 
{ 
    if ([keyPath isEqualToString:@"word"]) 
    { 
     definition = [[Lexicontext sharedDictionary] definitionAsHTMLFor:word]; 
     [[self webView] loadHTMLString:definition baseURL:nil]; 
     navItem.title = word; 
    } 
} 

-(void) done 
{ 
    [self dismissModalViewControllerAnimated:YES]; 
} 

-(void) pronounce 
{ 
    [[Lexicontext sharedDictionary] pronounce:word]; 
} 

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{ 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     // Custom initialization 
     [self addObserver:self forKeyPath:@"word" options:0 context:nil]; 
    } 
    return self; 
} 

- (void)dealloc 
{ 
    [super dealloc]; 
} 

- (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 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view from its nib. 
    [[self webView] loadHTMLString:definition baseURL:nil]; 
    navItem.title = word; 

    UIScrollView *scrollview = [[webView subviews] objectAtIndex:0]; 
    scrollview.bounces = NO; 
} 

- (void)viewDidUnload 
{ 
    [super viewDidUnload]; 
    // Release any retained subviews of the main view. 
    // e.g. self.myOutlet = nil; 
} 

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{ 
    // Return YES for supported orientations 
    return (interfaceOrientation == UIInterfaceOrientationPortrait); 
} 

@end 

你会如何使用：

-(void) somethingHappened:(id) sender 
{ 
    DictionaryViewController *dvc = [[DictionaryViewController alloc] initWithNibName:@"DictionaryViewController" bundle:[NSBundle mainBundle]]; 
    dvc.word = @"Some word to look up"; 
    [self presentModalViewController:dvc]; 
    [dvc release]; 
} 

Answer 2

我猜你已经用IB来创建视图。在这种情况下，[[[ArticleViewController alloc] init] autorelease];将不会为您加载该接口。您将不得不使用[[ArticleViewController alloc] initWithNibName:@"ArticleViewController" bundle:nil withText:@"Test!!"];来获得所需的结果。

但是，有一些关于你实现初始化器的方式是不正确的。

self.articleTextView = [[UITextView alloc] init]; 
self.articleTextView.text = [text retain]; 

首先，XIB将创建文本视图并链接到articleTextView属性。所以不需要再创建它。此外，这个视图还没有作为子视图添加到你的控制器的view属性中，所以它不会出现在屏幕上。 IB创建的文本视图将保留在屏幕上，但没有参考。你应该删除第一行。其次，文本视图中的text属性是copied属性。所以你的保留可以被认为是泄漏。

self.articleTextView.text = text; 

其他一切似乎都没问题。

编辑

-(IBAction)showArticleView:(UIButton *)sender{ 
    storyView = [[ArticleViewController alloc] initWithNibName:@"ArticleViewController" bundle:[NSBundle mainBundle]]; 

    storyView.articleTextView.text = [articles objectAtIndex:[sender tag]]; 
    [storyView setModalTransitionStyle:UIModalTransitionStyleCrossDissolve]; 
    storyView.modalPresentationStyle = UIModalPresentationPageSheet; 
    [self presentModalViewController:storyView animated:YES]; 
    [storyView release]; 
} 

Answer 3

你的财产articleTextView越来越字符串 “测试！测试！”。如果你在屏幕上的UITextview上看不到它，那是因为你将它挂接到一个具有相同名称的实例变量（articleTextView）。您可能想从实例变量中删除IBOutlet并将其放置在属性中。 @属性（非原子，保留）IBOutlet UITextView * articleTextView;你可能不需要再把它连接起来。希望这清除了你可能在ivars和属性之间产生的误解。