Question

我正在尝试使用模态视图控制器为我的应用程序创建1-2秒的闪屏但是当我尝试关闭视图时，我的应用程序崩溃时出现错误的访问错误。所以在我的申请代表中我有：

- (BOOL) application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
 //create window and show it
 window = [[UIWindow alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
 window.backgroundColor = [UIColor greenColor];
 [window makeKeyAndVisible];


 //create the main view controller and add its view to the window 
 mainViewCtrl = [MainViewController alloc];
 [window addSubview:mainViewCtrl.view];


 //show splash screen
 UIImage *image      = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle]  pathForResource:@"default.png" ofType:nil]];
 splashViewCtrl  = [[UIViewController alloc] init];
 splashViewCtrl.view = [[UIImageView alloc] initWithImage:image];
 [mainViewCtrl presentModalViewController:splashViewCtrl animated:NO];

//setup callback to dismiss
[self performSelector:@selector(hideSplash) withObject:nil afterDelay:2.0];

return(true);
}

//hide splash screen callback
- (void)hideSplash {
 [[self mainViewCtrl] dismissModalViewControllerAnimated:YES];
}

这一切都运行得很好，除非在2秒后调用hideSplash时应用程序崩溃并使用EXC_BAD_ACCESS。如果我注释掉执行选择器行并立即调用hidesplash：

[mainViewCtrl presentModalViewController:splashViewCtrl animated:NO];

[self hideSplash];

模态视图被正确驳回。我很确定这是一个内存管理问题，但我不确定我在这里做错了什么。有没有人知道这可能是什么或如何正确调试这样我可以推迟解雇？

由于

Answer 1

这看起来很奇怪：

mainViewCtrl = [MainViewController alloc];

尝试添加初始化调用。

Answer 2

//show splash screen
UIImage *image = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle]  pathForResource:@"default.png" ofType:nil]];
splashViewCtrl = [[UIViewController alloc] init];
splashViewCtrl.view = [[UIImageView alloc] initWithImage:image];
[mainViewCtrl presentModalViewController:splashViewCtrl animated:NO];

将上述内容更改为以下内容：

//show splash screen
UIImage *image = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle]  pathForResource:@"default.png" ofType:nil]];
splashViewCtrl = [[UIViewController alloc] init];
splashViewCtrl.view = [[UIImageView alloc] initWithImage:image];
[mainViewCtrl presentModalViewController:splashViewCtrl animated:NO];
[mainViewCtrl release]; //Add this line !!!!

启动屏幕：调用dismissModalViewControllerAnimated延迟后EXC_BAD_ACCESS

2 个答案: