Question

我有一个多个XIB文件项目。我有一个switchViewController类来处理内容视图的切换。我想从其他类调用此类中的方法。我有以下代码：

//SwitchViewController.h

Code:

#import <UIKit/UIKit.h>
@class MainMenuViewController;
@class GlassRepairsViewController;

@interface SwitchViewController : UIViewController {
 MainMenuViewController *mainMenuViewController;
 GlassRepairsViewController *glassRepairsViewController;

}


@property (retain,nonatomic) MainMenuViewController *mainMenuViewController;
@property (retain,nonatomic) GlassRepairsViewController *glassRepairsViewController;

-(IBAction)goToGlassRepairs;
-(IBAction)goToMainMenu;

@end

//switch view controller m file
Code:

#import "SwitchViewController.h"
#import "MainMenuViewController.h"
#import "GlassRepairsViewController.h"


@implementation SwitchViewController
@synthesize MainMenuViewController;
@synthesize GlassRepairsViewController;

- (void)viewDidLoad {
 MainMenuViewController *mainMenuController = [[MainMenuViewController alloc] initWithNibName:@"MainMenuView" bundle:nil];
 self.mainMenuViewController = mainMenuController;
 [self.view insertSubview:mainMenuController.view atIndex:0];
 [mainMenuController release];
    [super viewDidLoad];
}
//These IBActions are linked to buttons on the view that is linked to this class (swtichViewController)  This works perfectly for showing different nibs

-(IBAction) goToGlassRepairs
{
 if(self.glassRepairsViewController.view.superview == nil)
 {
  if(self.glassRepairsViewController == nil)  
  {
   GlassRepairsViewController *glassRepairsController = [[GlassRepairsViewController alloc] initWithNibName:@"GlassRepairsView" bundle:nil];
   self.GlassRepairsViewController =glassRepairsController;
   [glassRepairsController release];  
  }
  [mainMenuViewController.view removeFromSuperview];
  [self.view insertSubview:glassRepairsViewController.view atIndex:0]; 
 } 
}

-(IBAction) goToMainMenu
{
 if(self.mainMenuViewController.view.superview == nil)
 {
  if(self.mainMenuViewController == nil)  
  {
    MainMenuViewController *mainMenuController = [[ MainMenuViewController alloc] initWithNibName:@"MainMenuView" bundle:nil];
   self.mainMenuViewController = mainMenuController;
   [mainMenuController release];  
  }
  [glassRepairsViewController.view removeFromSuperview];
  [self.view insertSubview:mainMenuViewController.view atIndex:0]; 
 } 

}

//MainMenuViewController.h
Code:

#import <UIKit/UIKit.h>

@class SwitchViewController;


@interface MainMenuViewController : UIViewController {

}

-(IBAction)goToGlass;


@end

//MainMenuViewController.m

Code:

#import "MainMenuViewController.h"
#import "SwitchViewController.h"


@implementation MainMenuViewController


-(IBAction)goToGlass
{
  **//This is where I want to call the goToGlassRepairs method that is inside SwitchViewController's class...**


}

SwitchViewController是处理要显示和删除的笔尖的类。 MainMenu和glassRepairs是内容视图。但是，MainMenu需要访问switchviewcontroller类中的方法以允许从内容视图中导航。

我试过

`SwitchViewController *s = (SwitchViewController *)[[UIApplication sharedApplication] delegate];

[s goToGlassRepairs];`

它编译时没有警告，但会出现以下错误：

2010-03-09 15:51:28.350 Alfa2Go [29535：207] *** - [GoAppDelegate goToGlassRepairs]：无法识别的选择器发送到实例0x3b26620

2010-03-09 15:51:28.362 Go [29535：207] *由于未捕获的异常'NSInvalidArgumentException'而终止应用，原因：'*

- [GoAppDelegate goToGlassRepairs]：无法识别的选择器发送到实例0x3b26620'

Answer 1

好吧，我的猜测是[[UIApplication sharedApplication] delegate]没有返回SwitchViewController，而是返回GoAppDelegate。您需要找到SwitchViewController才能调用方法。

Answer 2

您可以在MainMenu类中创建属性（例如id switchController）。由于交换机视图控制器处理MainMenu的分配，它也可以将此属性设置为自己，因此MainMenu类将有一种方法来访问控制器......

Answer 3

终于让这个工作了：

我所做的是在app delegate中添加了一个函数，该函数在switchview控制器中调用了display function。然后我将app委托导入我的主菜单，并创建了一个调用app delegate函数的函数。

来自另一个类的Iphone调用方法

3 个答案: