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患者: 2 つのコントローラー -- ViewController と (モーダルに提示された) RecorderViewController 症状: RecorderViewController がモーダルに提示された後、いくつかの作業を行います。却下された後、プログラムは EXC_BAD_ACCESS でクラッシュします

AppDelegate.m で:

@synthesize window = _window;
@synthesize controller = _controller;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:    (NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    self.controller = [ViewController alloc];

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.rootViewController = self.controller;
    [self.window makeKeyAndVisible];

    return YES;
}

ViewController.m 内

#import "ViewController.h"
#import "RecorderViewController.h"

@interface ViewController ()

@end

@implementation ViewController

@synthesize presentModalButton;

- (void)loadView 
{
    self.view = [[UIView alloc] initWithFrame:[UIScreen mainScreen].applicationFrame];

    self.presentModalButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    self.presentModalButton.frame = CGRectMake(0, self.view.frame.size.height/2, 100, 50);
    [self.presentModalButton addTarget:self action:@selector(goToRecorderButtonPressed:) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:self.presentModalButton];

}

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

- (IBAction)goToRecorderButtonPressed:(id)sender {
    RecorderViewController *recorderVC = [RecorderViewController alloc];
    [self presentModalViewController:recorderVC animated:YES];
}

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

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

@end

UIApplicationMain: #import を返すときに main.m でクラッシュします。

#import "AppDelegate.h"

int main(int argc, char *argv[])
{
    @autoreleasepool {
        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }
}
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1 に答える 1

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方法に問題があると思いますgoToRecorderButtonPressed。

ほら、あなたはにメモリを割り当てていますが、recorderVCそれを初期化していません。使用可能なメソッドのいずれかを使用してオブジェクトを初期化する必要があります。たとえば、init次のようになります。

- (IBAction)goToRecorderButtonPressed:(id)sender {
    RecorderViewController *recorderVC = [[RecorderViewController alloc] init];
    [self presentModalViewController:recorderVC animated:YES];
}
于 2012-05-15T17:21:46.800 に答える