PushViewController不起作用

Question

我正在尝试学习Objective-C，并在单击按钮时遇到了一个问题。我有一个开关视图控制器，当我按“设置工具栏”按钮时，负责按下settings.nib文件。这是ViewController的代码：

//
//  ViewController.h
//  iReader
//
//  Created by Vivek Manjunath on 22/08/10.
//  Copyright (c) 2010 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>
@class ReaderMain;
@class Settings;
@class GoogleClientLogin;

@interface ViewController : UIViewController {

    ReaderMain *readerMain;
    Settings *settings;
    GoogleClientLogin *gClientLogin;
    UIBarButtonItem *mSignInOutButton;
    UIBarButtonItem *mRefresh;

}

@property (nonatomic, retain) ReaderMain *readerMain;
@property (nonatomic, retain) Settings *settings;
@property (nonatomic, retain) GoogleClientLogin *gClientLogin;
@property (nonatomic, retain) IBOutlet UIBarButtonItem *signInOutButton;
@property (nonatomic, retain) IBOutlet UIBarButtonItem *refreshButton;

-(IBAction) switchViews:(id)sender;
@end

viewController.m文件

//
//  ViewController.m
//  iReader
//
//  Created by Vivek Manjunath on 22/08/10.
//  Copyright (c) 2010 __MyCompanyName__. All rights reserved.
//

#import "ViewController.h"
#import "ReaderMain.h"
#import "Settings.h"


@implementation ViewController
@synthesize readerMain;
@synthesize settings;
@synthesize signInOutButton = mSignInOutButton;
@synthesize refreshButton =mRefresh;
@synthesize gClientLogin;

/*
 // 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 {
    if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) {
        // Custom initialization
    }
    return self;
}
*/


// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    ReaderMain *readerController= [[ReaderMain alloc] initWithNibName:@"ReaderMain" bundle:nil];
    self.readerMain = readerController;
    [self.view insertSubview:readerController.view atIndex:0];
    [readerController release];
    [super viewDidLoad];
}

-(IBAction)switchViews:(id)sender
{
    if(self.settings ==nil)
    {   
        //[mSignInOutButton setTitle:@"SignIn"];
        Settings *googleController = [[Settings alloc]initWithNibName:@"Settings" bundle:nil];
        self.settings = googleController;

        [googleController release];
    }
    [UIView beginAnimations:@"View Flip" context:nil];
    [UIView setAnimationDuration:1.00];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];

    if(readerMain.view.superview ==nil)
    {   
        [mSignInOutButton setTitle:@"Settings"];
        [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.view cache:NO];
        [readerMain viewWillAppear:YES];
        [settings viewWillDisappear:YES];
        [settings.view removeFromSuperview];
        [self.view insertSubview:readerMain.view atIndex:0];
        [settings viewDidDisappear:YES];
        [readerMain viewDidAppear:YES];
        //[mSignInOutButton setTitle:@"SignOut"];

    }

    else 
    {   
        [mSignInOutButton setTitle:@"Back"];
        [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.view cache:NO];
        [settings viewWillAppear:YES];
        [readerMain viewWillDisappear:YES];

        [readerMain.view removeFromSuperview];
        [self.view insertSubview:settings.view atIndex:0];

        [readerMain viewDidDisappear:YES];

        [settings viewDidAppear:YES];

    }
    [UIView commitAnimations];
}
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/

- (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 {
    [readerMain release];
    [settings release];
    [mSignInOutButton release];
    [mRefresh release];
    [super dealloc];
}


@end

这是按预期工作的。加载settings.nib文件后，我想为高级设置加载另一个ViewController。我试图这样做以下操作：

settings.h文件

//
//  Settings.h
//  iReader
//
//  Created by Vivek Manjunath on 22/08/10.
//  Copyright (c) 2010 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "ViewController.h"


@interface Settings : UIViewController {

    IBOutlet UIButton *googleReaderSettings;

}

@property (nonatomic, retain) IBOutlet UIButton *googleReaderSettings;
-(IBAction) goToViewTwo;
@end

settings.m文件

//
//  Settings.m
//  iReader
//
//  Created by Vivek Manjunath on 22/08/10.
//  Copyright (c) 2010 __MyCompanyName__. All rights reserved.
//

#import "Settings.h"
#import "GoogleClientLogin.h"
#import "iReaderAppDelegate.h"


@implementation Settings
@synthesize googleReaderSettings;

-(IBAction)goToViewTwo{
    GoogleClientLogin *gClient=[[GoogleClientLogin alloc]initWithNibName:@"GoogleClientLogin" bundle:[NSBundle mainBundle]];
    [self.navigationController pushViewController:gClient animated:YES];
    [gClient release];
}
/*
 // 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 {
    if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) {
        // Custom initialization
    }
    return self;
}
*/

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

/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/

- (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 {
    [googleReaderSettings release];
    [super dealloc];
}


@end

最后我的委托文件：

//
//  iReaderAppDelegate.h
//  iReader
//
//  Created by Vivek Manjunath on 22/08/10.
//  Copyright (c) 2010 __MyCompanyName__. All rights reserved.
//


#import <UIKit/UIKit.h>
@class ViewController;
@class Settings;

@interface iReaderAppDelegate : NSObject <UIApplicationDelegate> {

    UIWindow *window;
    IBOutlet ViewController *switchViewController;
    IBOutlet ViewController *settings;

}

@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet ViewController *switchViewController;
@property (nonatomic, retain) IBOutlet ViewController *settings;

@end

和delegate.m文件

//
//  iReaderAppDelegate.m
//  iReader
//
//  Created by Vivek Manjunath on 22/08/10.
//  Copyright (c) 2010 __MyCompanyName__. All rights reserved.
//


#import "iReaderAppDelegate.h"
#import "ViewController.h"

@implementation iReaderAppDelegate


@synthesize window;
@synthesize switchViewController, settings;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    // Override point for customization after application launch.
    [window addSubview:switchViewController.view];
    [window addSubview:settings.view];
    [window makeKeyAndVisible];
    return YES;
}

- (void)applicationWillTerminate:(UIApplication *)application {

    // Save data if appropriate.
}

- (void)dealloc {

    [window release];
    [switchViewController release];
    [settings release];
    [super dealloc];
}

@end

但是，当我按按钮加载GoogleClientLogin视图时，它无能为力。也没有控制台输出。有人可以帮我解决这个问题吗？我修复了内存泄漏，NSLOG表明它正在输入gotoviewtwo。

Answer 1

在旅途中，我在您的代码中看到了2件事。

1）您是否将iBaction连接到按钮，它应该触发更改？ （在接口构成中）

2）在您的gotoviewtwo methode中，您可以分配gclient，但您永远不会发布它。因此，您会产生内存泄漏。

我的建议：放一个 NSLog(@'Was in GoToViewTwo-Method') 在您的gotoviewtwo方法中，用于测试使用程序时是否执行。因此，您可以查看ViewController是否是问题或显示它是问题所在。 ;-)

对不起我的英语不好。我知道这不是最好的，但是我尽力写作。 ;-)

Answer 2

您是否在IB中设置了NavigationController？

否则，我看不到您在代码中使用它的地方。