在iPhone编程中由于未捕获的异常'NSInvalidArgumentException'终止了应用程序

Question

我有以下代码用于按钮创建以及按钮的操作，我正在调用buildUI方法

CGRect cgRct = CGRectMake(10 ,30 ,400, 320); //define size and position of view 
subMainView_G_obj = [[UIView alloc] initWithFrame:cgRct]; //initilize the view 
subMainView_G_obj.autoresizesSubviews = YES;  

//set view property ov controller to the newly created view
// create Button's for modules in array (UIButtonTypeRoundedRect)
UIButton_G_obj = [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain]; 
UIButton_G_obj.frame = CGRectMake(100,30,100,50);
[UIButton_G_obj setTitle:@"UI" forState:UIControlStateNormal];
UIButton_G_obj.backgroundColor = [UIColor clearColor];
[subMainView_G_obj  addSubview:UIButton_G_obj];
//[UIButton_G_obj setEnabled:TRUE];
[UIButton_G_obj addTarget:subMainView_G_obj action:@selector(buildUIWorkArea) forControlEvents:UIControlEventTouchUpInside];

 [mainView_G_obj addSubview:subMainView_G_obj];

}-（void）buildUIWorkArea {// UIView * uiWorkAreaView_G_obj; [uiWorkAreaView_G_obj clearsContextBeforeDrawing]; CGRect cgRct2 = CGRectMake（0.0，0.0，480，320）; //定义View的大小和位置uiWorkAreaView_G_obj = [[UIView alloc] initWithFrame：cgRct2]; //初始化视图uiWorkAreaView_G_obj.autoresizesSubviews = YES;

 (UIButtonTypeRoundedRect)buttonUIObj = [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain]; 
    buttonUIObj.frame = CGRectMake(100.30,100,50);
    [buttonUIObj setTitle:BUTTON  forState:UIControlStateNormal];
    buttonUIObj.backgroundColor = [UIColor clearColor];
    [uiWorkAreaView_G_obj  addSubview:buttonUIObj];
    [buttonUIObj addTarget:uiWorkAreaView_G_obj action:@selector(showModuleView:) forControlEvents:UIControlEventTouchUpInside];


 [mainView_G_obj clearsContextBeforeDrawing];
 [mainView_G_obj addSubview:uiWorkAreaView_G_obj];

}

在UIView uiWorkAreaView_G_obj上单击按钮UI时，它必须在UIView uiWorkAreaView_G_obj上再创建一个按钮BUTTON，然后在每个子视图中放置按钮后，将这些子视图放置在UIView类型的通用mainview_G_obj上。 但是它抛出一个异常.......

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[UIView buildUIWorkArea]:unrecognized selector sent to instance 0x57ca80' 

我不明白为什么我将buildUIWorkArea的返回类型声明为void时将其作为UIView。

请帮助。

Answer 1

[UIButton_G_obj addTarget:subMainView_G_obj action:@selector(buildUIWorkArea)
         forControlEvents:UIControlEventTouchUpInside];

该行表示，当用户触摸按钮内部时，将调用以下功能：

[subMainView_G_obj buildUIWorkArea];

由于subMainView_G_obj是普通的UIView，因此没有-buildUIWorkArea方法，因此没有错误。 -buildUIWorkArea的返回类型无关紧要。

您可能想将-buildUIWorkArea发送给self ：

[UIButton_G_obj addTarget:self action:@selector(buildUIWorkArea)
         forControlEvents:UIControlEventTouchUpInside];