想从appdelegate调用ViewController的方法 [英] want to call ViewController's method from appdelegate

问题描述

我想在AppDelegate.m中调用ViewController的方法. 我在Viewcontroller中有method()方法.我希望在appdelegate.m中调用didSelectMethod()时调用它. 我已经这样调用了方法.-

I want to call ViewController's method in AppDelegate.m. i have method method() in my Viewcontroller .i want it to be called when didSelectMethod() called in appdelegate.m. I have called method like this.-

ViewController *vc=[[ViewController alloc]init];
[vc method];

调用了

方法，但没有与实际具有的方法相同的实例. 它具有所有nill值.谁能给我适合我想要的代码.

method is called but not having same instance as actually method having. it having all nill values. can anyone give me right code for this what i want.

谢谢 Jagveer Rana

Thank you Jagveer Rana

推荐答案

尽管对于视图控制器为rootViewController的情况，此问题已正确回答，但出于完整性考虑，这是使该视图与任何视图一起使用的方法控制器:

While this has been correctly answered for the case where the view controller is the rootViewController, for completeness sake here's how you can get this to work with any view controller:

// ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

- (void)myMethod;

@end

// ViewController.m

#import "ViewController.h"
#import "AppDelegate.h"

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
    appDelegate.myViewController = self;

}

- (void)myMethod
{
    NSLog(@"Doing something interesting");
}

// AppDelegate.h

#import <UIKit/UIKit.h>
#import "ViewController.h"

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;
@property (weak, nonatomic) ViewController *myViewController;

@end

// AppDelegate.m

#import "AppDelegate.h"

@implementation AppDelegate

- (void)applicationDidEnterBackground:(UIApplication *)application {

    [self.myViewController myMethod];

}

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