Iphone 委托方法抛出运行时“;“无法识别的选择器”;从一个UIViewController切换回主视图控制器时出错
好吧,我花了半天的时间在这上面,我都快死了 因此,我有3个视图控制器相互转换,如下所示: 销毁前一个视图控制器后,我调用UploadDecisionViewController:Iphone 委托方法抛出运行时“;“无法识别的选择器”;从一个UIViewController切换回主视图控制器时出错,iphone,uiviewcontroller,interface-builder,Iphone,Uiviewcontroller,Interface Builder,好吧,我花了半天的时间在这上面,我都快死了 因此,我有3个视图控制器相互转换,如下所示: 销毁前一个视图控制器后,我调用UploadDecisionViewController: [self dismissModalViewControllerAnimated:YES]; [self performSelector:@selector(showUDModalView) withObject:nil afterDelay:0.5]; 在我的showUDModalView方法中: - (void)
[self dismissModalViewControllerAnimated:YES];
[self performSelector:@selector(showUDModalView) withObject:nil afterDelay:0.5];
在我的showUDModalView方法中:
- (void)showUDModalView
{
UploadDecisionViewController *udcontroller = [[UploadDecisionViewController alloc] initWithNibName:@"UploadDecisionViewController" bundle:nil];
udcontroller.delegate = self;
[self presentModalViewController:udcontroller animated:YES];
[udcontroller release];
}
UploadDecisionViewController显示没有问题。UploadDecisionViewController有一个按钮,单击该按钮时,我希望它转换为FileUploadViewController。我设置了一个UploadDecisionDelegate,在其中抛出了一个方法来处理按钮单击:
内部UploadDecisionDelegate协议(UploadDecisionViewController.h):
然后在我的iAction方法中,当单击按钮时,我有以下内容:
- (IBAction)decisionSelected:(id)sender
{
[delegate UploadDecisionViewController:self madeChoice:@"upload"];//crashing at this line
}
当我运行它时,在上面的这一行,它会抛出一个运行时异常:
2010-06-09 12:48:59.561 UOnlive[4735:207] *** -[UIView UploadDecisionViewController:madeChoice:]: unrecognized selector sent to instance 0x3b65420
2010-06-09 12:48:59.562 UOnlive[4735:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[UIView UploadDecisionViewController:madeChoice:]: unrecognized selector sent to instance 0x3b65420'
2010-06-09 12:48:59.563 UOnlive[4735:207] Stack: (
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2982917,
3390286,
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40150549,
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)
让我来介绍一下实现的委托方法:
- (void)UploadDecisionViewController:(UploadDecisionViewController *)controller madeChoice:(NSString *)whichDirection
{
NSLog(@"it got to here 245");
[self dismissModalViewControllerAnimated:YES];
if (yesOrNo) {
//open up the FileUploadViewController and proceed to upload
[self performSelector:@selector(showFUModalView) withObject:nil afterDelay:0.5];
}
}
谁能告诉我到底发生了什么事?感谢大家的帮助……您的代码太长了,我不想再重复一遍,只是一个建议,如果您的对象可以/不能使用这种语句执行选择器,您可以使用c:
if([myObj respondsToSelector:@selector(myFunc)])
{
//do something
}
else{
//do something else
}
错误表明您正试图调用
UIView
上的UploadDecisionViewController
方法
我敢打赌,您为代理设置了一些视图,而不是视图控制器
showUDModalView
方法位于何处?也许您可以在其他地方设置代理?对不起,我只是想说得全面一些。简而言之,在链接按钮以调用另一个viewcontroller的方法中,如果我想通过调用委托函数将控件返回到主视图控制器,则会引发错误,但在该调用中出错。希望这能说明问题。是的,那是我的问题。感谢帮助:)我将委托设置为nibs中的视图…:)
if([myObj respondsToSelector:@selector(myFunc)])
{
//do something
}
else{
//do something else
}