Question

我在视图中以编程方式创建了2个按钮。两种选择器方法都存在，但它仍然会抛出“无法识别的选择器”错误。我读了一些关于检查僵尸的事情。但是我激活了它（xcode 4.2）并没有看到任何关于任何僵尸的事情。这是代码..

- (void)viewDidLoad
{

    for(int i = 0; i < [list count]; i++){  

     ... if statement checks to add text fields
    }

     UIButton *submit = [UIButton buttonWithType:UIButtonTypeRoundedRect];
     [submit addTarget:self action:@selector(submission:)
     forControlEvents:UIControlEventTouchUpInside];
     [submit setTitle:@"Submit" forState:UIControlStateNormal];
     submit.frame = CGRectMake(x+ 170.0, y, 72, 37);

    UIButton *addition = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [addition addTarget:self action:@selector(addition:)
    forControlEvents:UIControlEventTouchUpInside];
    [addition setTitle:@"Additional Mission" forState:UIControlStateNormal];
    addition.frame = CGRectMake(x, y, 140, 37);

    y = y+90;
   [inputsView addSubview:submit];
   [inputsView addSubview:addition];
   [inputsView setScrollEnabled:YES];
   [inputsView setContentSize:CGSizeMake(320, y)]; 


}

 - (void)submission{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Submission Complete" message:@"Submission"
                                               delegate:self cancelButtonTitle:@"No" otherButtonTitles:@"Yes", nil];
[alert show];
}

 -(void)addition{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Creating Additional Mission" message:@"Additional Mission"
                                               delegate:self cancelButtonTitle:@"No" otherButtonTitles:@"Yes", nil];
[alert show];
}

有一点需要注意.. inputsView是一个UIScrollView，位于我的viewcontroller中。

提前致谢。

Answer 1

从选择器方法中删除冒号

[submit addTarget:self action:@selector(submission)

[addition addTarget:self action:@selector(addition)

冒号告诉选择器这个方法接受参数，你的不是这样冒号不应该是选择器的一部分

Answer 2

[add addTarget：self action：@selector（addition :)

在这一行中你说你的选择器@selector(addition:)需要一个加法后冒号的参数 但在你的真实方法

 -(void)addition{

添加后没有参数..这就是崩溃的原因..在提交和添加中删除冒号，你会很高兴。

即使选择器存在，UIButton选择器也会抛出'无法识别的选择器'

2 个答案: