[英]unrecognized selector sent to instance 0x6b61d10
I am practicing delegate in iphone development but have a problem 我正在iphone开发中练习委托,但是有问题
2012-05-12 21:21:54.279 DelegatePractice[2924:f803] -[secondViewController viewControllers]: unrecognized selector sent to instance 0x6b61d10 2012-05-12 21:21:54.281 DelegatePractice[2924:f803] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[secondViewController viewControllers]: unrecognized selector sent to instance 0x6b61d10' * First throw call stack: (0x13bb052 0x154cd0a 0x13bcced 0x1321f00 0x1321ce2 0x2596 0x436e1e 0x13bcec9 0x155c2 0x250d54 0x13bcec9 0x155c2 0x1555a 0xbab76 0xbb03f 0xba2fe 0x3aa30 0x3ac56 0x21384 0x14aa9 0x12a5fa9 0x138f1c5 0x12f4022 0x12f290a 0x12f1db4 0x12f1ccb 0x12a4879 0x12a493e 0x12a9b 0x1e98 0x1df5) 2012-05-12 21:21:54.279 DelegatePractice [2924:f803]-[secondViewController viewControllers]:无法识别的选择器发送到实例0x6b61d10 2012-05-12 21:21:54.281 DelegatePractice [2924:f803] *由于未捕获而终止应用程序异常'NSInvalidArgumentException',原因是: ' - [secondViewController viewControllers]:无法识别的选择发送到实例0x6b61d10' *第一掷调用堆栈:(0x13bb052 0x154cd0a 0x13bcced 0x1321f00 0x1321ce2 0x2596 0x436e1e 0x13bcec9 0x155c2 0x250d54 0x13bcec9 0x155c2 0x1555a 0xbab76 0xbb03f 0xba2fe 0x3aa30 0x3ac56 0x21384 0x14aa9 0x12a5fa9 0x138f1c5 0x12f4022 0x12f290a 0x12f1db4 0x12f1ccb 0x12a4879 0x12a493e 0x12a9b 0x1e98 0x1df5)
and I think I set up the delegate properly: 我认为我正确设置了代表:
delegateViewController.m proxyViewController.m
- (void)secondViewControllerDidJump:
(secondViewController *)controller
{
[self dismissViewControllerAnimated:YES completion:nil];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:@"jump"])
{
UINavigationController *navigationController = segue.destinationViewController;
secondViewController *SecondViewController =[[navigationController viewControllers]objectAtIndex:0];
SecondViewController.delegate = self;
}
}
@end
secondViewController.h secondViewController.h
@class secondViewController;
@protocol SecondViewControllerDelegate <NSObject>
- (void)secondViewControllerDidJump: (secondViewController *)controller;
@end
@interface secondViewController : UITableViewController
@property (strong,nonatomic) NSArray *choices;
@property (nonatomic, weak) id <SecondViewControllerDelegate> delegate;
- (IBAction)jump:(id)sender;
@end
secondViewController.m secondViewController.m
- (IBAction)jump:(id)sender
{
[self.delegate secondViewControllerDidJump:self];
}
Had the same issue, i solved by using: 有同样的问题,我通过使用以下方法解决了:
secondViewController *SecondViewController = segue.destinationViewController;
Basically segue.destinationViewController returns a view controller, so use it. 基本上,segue.destinationViewController返回一个视图控制器,因此请使用它。
Your app crashes in these lines: 您的应用在以下行中崩溃:
UINavigationController *navigationController = segue.destinationViewController;
secondViewController *SecondViewController =[[navigationController viewControllers]objectAtIndex:0];
You ask navigationController
for its viewControllers
, but the log makes clear that navigationController
is not a UINavigationController
but a secondViewController
, which does not respond to the selector -viewControllers
. 您向navigationController
询问其viewControllers
,但日志清楚地表明navigationController
不是 UINavigationController
而是secondViewController
,它不响应选择器-viewControllers
。
Make sure that segue.destinationViewController
really returns a UINavigationController
. 确保segue.destinationViewController
确实返回UINavigationController
。
尝试这个
secondViewController *SecondViewController =[[self.navigationController viewControllers]objectAtIndex:0];
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