Question

一些帮助将不胜感激。

我有这个简单的项目用于测试目的：

http://dl.dropbox.com/u/10101053/testDelegate.zip

我想在委托方法中传递NSString但是这段代码不起作用。

testDelegateViewController.h

@protocol testDelegateViewControllerDelegate; 


@interface testDelegateViewController : UIViewController {


id<testDelegateViewControllerDelegate> delegate;

IBOutlet UIButton *button;

}

@property (nonatomic, assign) id<testDelegateViewControllerDelegate> delegate;
@property (nonatomic, retain) IBOutlet UIButton *button;

- (void)pass;

@end

@protocol testDelegateViewControllerDelegate

- (void)passSomeToDelegate:(NSString *)some;

@end

testDelegateVewController.m

#import "testDelegateViewController.h"

@implementation testDelegateViewController
@synthesize delegate, button;


- (void)pass
{
    NSLog(@"Button Pressed");
    [self.delegate passSomeToDelegate:@"some"];
}

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
    [super viewDidLoad];


    [button addTarget:self action:@selector(pass) forControlEvents:UIControlEventTouchUpInside];
}

//rest of code

AppDelegate.h

#import "testDelegateViewController.h"

@interface AppDelegate : NSObject <UIApplicationDelegate, testDelegateViewControllerDelegate> {

}

AppDelegate.m

#import "AppDelegate.h"

@implementation AppDelegate


@synthesize window=_window;

@synthesize viewController=_viewController;

#pragma mark Delegate Method

- (void)passSomeToDelegate:(NSString *)some
{
    NSLog(@"%@", some);
}

//rest of code

但是在我的控制台中，按下按钮时不会打印任何内容。

由于

Answer 1

您忘记设置代理人了。您可以使用application:didFinishLaunchingWithOptions:方法设置委托。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{   
    self.viewController.delegate = self;

    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    return YES;
}

我添加了self.viewController.delegate = self;来设置代理。

简单的委托方法不起作用

1 个答案: