如何从已经在UINavigationController堆栈上的UIViewController调用一个方法 [英] How to call a method from a UIViewController thats already on the UINavigationController stack

问题描述

我在UINavigationStack上有一个UIViewController，从这个UIView我加载另一个视图不是堆栈，而是一个子视图。我加载的这个视图只是我覆盖到任何显示的应用程序的首选项视图。

ie

  myViewController<  - 在堆栈按钮上触摸负载作为myViewController的子视图
 + prefrencesViewController 
  

我的问题是，是否有一种方法调用一个方法在myViewController从prefrencesViewController？我试图使用委托和协议，但它不工作，所以我希望有一个简单的方法来做这个我不知道，或者也许我可以得到一些帮助我的委托/协议...

这是我的代码看起来像代理和协议设置

// prefrencesViewController.h

  @protocol GetPrefrencesViewControllerDelegate< NSObject> 
  - （void）reloadViewFromSavedPrefrences; 
 @end 
 
 //代理和协议
 @property（nonatomic，weak）id&GetPrefrencesViewControllerDelegate>代表; 
  

// prefrencesViewController.m

  //代理和协议
 @synthesize delegate; 
 
 // ..内按钮动作
 [[self delegate] reloadViewFromSavedPrefrences]; 
  

// myViewController.h

  #importprefrencesViewController.h
 
 @interface myViewController：UIViewController< UITabBarDelegate，GetGUIEncodedData，GetPrefrencesViewControllerDelegate> {
 
 // prefrencesViewController设置
 prefrencesViewController * pvc; 
 
 @property（强，非原子）prefrencesViewController * pvc; 
  

// myViewontroller.h

  @synthesize pvc; 
 
  - （void）viewDidLoad 
 {
 // .. 
 [pvc setDelegate：self]; 
} 
 
 //委托和预处理..已保存按下重新加载视图。 
  - （void）reloadViewFromSavedPrefrences {
 
 NSLog（@WORKED）; 
 
} 
  

任何帮助将不胜感激

解决方案

我不确定您是否遵循下面将介绍的步骤，但如果您不在这里的示例。

PresentedViewController.h

  // import stuff 
 @protocol PresentedViewControllerDelegate< NSObject> 
  - （void）methodThatSouldBeImplementedByOtherController; //你可以添加参数
 @end 
 
 @interface PresentedViewController：UIViewController {
 //实例变量
} 
 @property（nonatomic，assign（ ARK的一周））id< PresentedViewControllerDelegate>委托
 //公共方法这里
  

PresentedViewController.m

  @implementation PresentedViewController 
 @synthesize delegate; 
 
 //方法实现这里
 
  - （IBAction）buttonThatWillCallTheDelegate：（id）sender {
 
 if（[self.delegate responsesToSelector：@selector （methodThatSouldBeImplementedByOtherController）]）{
 [self.delegate methodThatSouldBeImplementedByOtherController]; 
} 
} 
  

ControllerThatWillPresent.h / p>

  @interface ControllerThatWillPresent：UIViewController< PresentedViewControllerDelegate> {
 //实例变量
} 
 
 //某些方法可能是
  

ControllerThatWillPresen.m

  @implementation ControllerThatWillPresen 
 
  - （void）methodThatWillShowTheVC {
 PresentedViewController * vc = [PresentedViewController alloc] init]; // initWithNibname ... 
 vc.delegate = self; 
 // presentVc，pushVc，addChild ... 
} 
 
  - （void）methodThatSouldBeImplementedByOtherController {
 //在代理方法中执行东西
} 
  

I have a UIViewController on a UINavigationStack and from this UIView I load another view not onto the stack but as a subview. This view that I load is just a preferences view for the app that I overlay onto what ever is showing.

i.e.

myViewController <- on the stack button touch loads as a subview to myViewController
+ prefrencesViewController 

My question is, is there a way to call a method thats in myViewController from prefrencesViewController? I am trying to use delegates and protocols but its not working, so I am hoping there is either an easy way to do this I don't know about yet or maybe I could get some help with my delegate/protocol...

This is what my code looks like for delegate and protocol set up

//prefrencesViewController.h

@protocol GetPrefrencesViewControllerDelegate <NSObject>
-(void)reloadViewFromSavedPrefrences;
@end

//delegates and protocols
@property (nonatomic, weak) id <GetPrefrencesViewControllerDelegate> delegate;

//prefrencesViewController.m

//delegates and protocols
@synthesize delegate;

//.. inside button action
[[self delegate] reloadViewFromSavedPrefrences];

//myViewController.h

#import "prefrencesViewController.h"

@interface myViewController : UIViewController <UITabBarDelegate, GetGUIEncodedData, GetPrefrencesViewControllerDelegate> {

// prefrencesViewController set up
    prefrencesViewController *pvc;

@property (strong, nonatomic) prefrencesViewController *pvc;

//myViewontroller.h

@synthesize pvc;

- (void)viewDidLoad
{
    //..
    [pvc setDelegate:self];
}

//Delegate and prefrences.. Saved pressed reload the view here.
-(void)reloadViewFromSavedPrefrences {

    NSLog(@"WORKED");

}

any help would be greatly appreciated

解决方案

I'm not sure that you are following the steps that I will present below but if you don't here is the example.

PresentedViewController.h

//import stuff
@protocol PresentedViewControllerDelegate <NSObject>
-(void)methodThatSouldBeImplementedByOtherController; //you can add params
@end

@interface PresentedViewController : UIViewController {
 //instance variables
}
@property (nonatomic, assign(week for ARK)) id<PresentedViewControllerDelegate>delegate
//public methods here

PresentedViewController.m

@implementation PresentedViewController 
@synthesize delegate;

//method implementation here

-(IBAction)buttonThatWillCallTheDelegate:(id)sender {

   if([self.delegate respondsToSelector:@selector(methodThatSouldBeImplementedByOtherController)]) {
    [self.delegate methodThatSouldBeImplementedByOtherController];
   }
}

ControllerThatWillPresent.h

@interface ControllerThatWillPresent : UIViewController <PresentedViewControllerDelegate> {
   //instance variables
}

//some methods maybe

ControllerThatWillPresen.m

@implementation ControllerThatWillPresen 

-(void)methodThatWillShowTheVC {
     PresentedViewController *vc = [PresentedViewController alloc] init]; //initWithNibname...
    vc.delegate = self;
   //presentVc, pushVc, addChild ... 
}

-(void)methodThatSouldBeImplementedByOtherController {
 //do stuff in delegate method
}

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