iphone - 单击按钮时iOS应用程序崩溃iPhone

我正在使用xcode 4.2和ARC。下面是我正在使用的代码。当我单击任何按钮时，我的应用程序崩溃，并在main.m中突出显示此代码

有时我会收到此错误

-[__NSCFTimer parentLogin:]: unrecognized selector sent to instance

有时应用程序崩溃而没有任何错误。

return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));

我的代码是：

在我的ViewController.m中，我正在使用此代码访问ChooseLogin视图控制器。

- (IBAction)action:(id)sender {


    ChooseLogin *loginScreen = [[ChooseLogin alloc] initWithNibName:@"ChooseLogin" bundle:nil];
    [UIView beginAnimations:@"flipview" context:nil];
    [UIView setAnimationDuration:2];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.view cache:NO];
    [self.view addSubview:loginScreen.view];
    [UIView commitAnimations];
}

然后在ChooseLogin.m中：

@implementation ChooseLogin


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


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

- (IBAction)parentLogin:(id)sender {

    NSLog(@":::::::");

    NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];

    NSString *passwd = [prefs stringForKey:@"password"];

    NSLog(@"data saved");

    if (passwd == nil) {


    CreatePassword *cPassword = [[CreatePassword alloc] initWithNibName:@"CreatePassword" bundle:nil ];
        [UIView beginAnimations:@"flipview" context:nil];
        [UIView setAnimationDuration:1];
        [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
        [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.view cache:NO];
        [self.view addSubview:cPassword.view];
        [UIView commitAnimations];

    }else {

        UserPassword *uPasswd = [[UserPassword alloc] initWithNibName:@"UserPassword" bundle:nil];
        [UIView beginAnimations:@"flipview" context:nil];
        [UIView setAnimationDuration:1];
        [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
        [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.view cache:NO];
        [self.view addSubview:uPasswd.view];
        [UIView commitAnimations];

    }
}

- (IBAction)childLogin:(id)sender {

    ChildLogin *loginScreen = [[ChildLogin alloc] initWithNibName:@"ChildLogin" bundle:nil];
    [UIView beginAnimations:@"flipview" context:nil];
   // [UIView setAnimationDuration:1];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.view cache:NO];
    [self.view addSubview:loginScreen.view];
    [UIView commitAnimations];
}

@end

最佳答案

-[__NSCFTimer parentLogin:]: unrecognized selector sent to instance

这意味着消息正在发送到该类无法识别的类-您尚未编写此自定义选择器（函数），或者某种程度上函数已发送到错误的类，因此无法识别。 XCode通常在尝试编写代码时很好地捕获它们，但是似乎没有在XIB文件中检查它们。

根据我的经验，此类问题的最常见原因是删除或重命名函数，而忘记更新与该类关联的XIB文件-或者您确实对其进行更新，并且它添加了新版本的功能，而不会忘记旧的功能。