從多個文件

Question

調用選擇在AppDelegate.m，我定義

#import "AppDelegate.h" 
#import "allerta.h" 

@implementation AppDelegate 
@synthesize window = _window; 

-(void)awakeFromNib { 

// Add an observer that will respond to loginComplete 
[[NSNotificationCenter defaultCenter] addObserver:self 
             selector:@selector(alerticonstatus:) 
              name:@"alert" object:nil]; 

// Post a notification to loginComplete 
[[NSNotificationCenter defaultCenter] postNotificationName:@"alert" object:nil]; 
} 
@end 

我想從allerta.h調用alerticonstatus：

#import <Foundation/Foundation.h> 
@interface allerta : NSObject{ 
} 

-(void)alerticonstatus:(NSNotification *)note; 

@end 

allerta.m：

#import "allerta.h" 
@implementation allerta 

-(void)alerticonstatus:(NSNotification *)note { 

NSLog(@"called alerticonstatus"); 

} 
@end 

我可以從其他文件如allerta.h中導入函數whit @selector嗎？ 現在我有SIGABRT錯誤。 你能幫我嗎？謝謝。

Answer 1

更改你方法這一點，它的工作：

#import "AppDelegate.h" 
#import "allerta.h" 

@implementation AppDelegate 
@synthesize window = _window; 

-(void)awakeFromNib { 
    allerta *_allerta = [allerta alloc]; //allocation memory 

    // Add an observer that will respond to loginComplete 
    [[NSNotificationCenter defaultCenter] addObserver:_allerta //here you called self, but you need to call your class allerta 
             selector:@selector(alerticonstatus:) 
              name:@"alert" object:nil]; 
    [_allerta release]; //kill _allerta class if you don't need more 

    // Post a notification to loginComplete 
    [[NSNotificationCenter defaultCenter] postNotificationName:@"alert" object:nil]; 
} 
@end 

當你創建的類文件，設置冷杉信大，像爲「Allerta」。

Answer 2

我認爲你的問題是，當AppDelegate沒有聲明這個方法時，你聲明AppDelegate爲alerticonstatus消息的接收者。你在這行做這個：

[[NSNotificationCenter defaultCenter] addObserver:self 
             selector:@selector(alerticonstatus:) 
              name:@"alert" object:nil]; 

你的解決辦法是從self在這種情況下是AppDelegate的一些allerta對象更改的觀察員。只需alloc-init一些allerta對象並將其添加爲觀察者。