Question

我在这样的didFinishLaunchingWithOptions中添加了导航控制器到我的应用中

LoginViewController *mainView = [[[LoginViewController alloc]initWithNibName:@"LoginViewController" bundle:nil] autorelease];
navigationController = [[[UINavigationController alloc]initWithRootViewController:mainView]autorelease];
[self.window addSubview:navigationController.view];
[self.window makeKeyAndVisible];

在我的LoginViewController的viewDidLoad中，

self.navigationItem.hidesBackButton = YES;
[super viewDidLoad];

UIImage *img = [[UIImage alloc] init];
img = [UIImage imageNamed:@"top_bar.png"];
bar = [self.navigationController navigationBar];
[bar setBackgroundImage:img forBarMetrics:UIBarMetricsDefault];

UIImage *signIn = [UIImage imageNamed:@"signin_btn.png"];
UIButton *phButton = [UIButton buttonWithType:UIButtonTypeCustom];
[phButton setImage:signIn forState:UIControlStateNormal];
phButton.frame = CGRectMake(0.0, 0.0, signIn.size.width, signIn.size.height);
UIBarButtonItem *phBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:phButton];
self.navigationItem.rightBarButtonItem = phBarButtonItem;
[phButton addTarget:self action:@selector(checkConnection) forControlEvents:UIControlEventTouchUpInside];
[phButton release];

当我在手机中运行该应用程序时，它会崩溃。当我从appDelagate中删除导航控制器时，它可以工作......我无法让我的导航正常工作，我怎样才能避免它崩溃。

Answer 1

修改您的代码

试试这段代码声明appdelegate.h文件

@class LoginViewController;  

LoginViewController *viewController; 
@property (nonatomic, retain) IBOutlet LoginViewController *viewController;

appdelegate.m文件声明

@synthesize viewController;

在didFinishLaunchingWithOptions

中

UINavigationController *nav=[[UINavigationController alloc] initWithRootViewController:viewController];
[window addSubview:nav.view];
[window makeKeyAndVisible];
return YES;

  -(void) dealloc
 {
 [viewController release]; 
 ......//some code
 }

Answer 2

我这导致崩溃。

[phButton release];

phButton不需要发布;

顺便说一下，

需要释放

phBarButtonItem;

Answer 3

我认为问题在于您使用导航控制器进行自动释放。

您尝试删除autorelease或

navigationController = [[UINavigationController 页头] initWithRootViewController：MAINVIEW];

尝试使用属性（如果有），

self.navigationController = [[[UINavigationController 页头] initWithRootViewController：MAINVIEW]自动释放];

Answer 4

试试这个...

self.window.rootViewController = navigationController;

而不是[self.window addSubview:navigationController.view];

Answer 5

[phButton发布];删除该行＆amp;

img ＆amp; phBarButtonItem 需要发布

navigationcontroller导致应用崩溃

5 个答案: