Question

我有一个有代表的课程：

@protocol SNIRCControllerDelegate

- (void) serverTalked:(id)data;

@end

@interface SNIRCController : NSObject <NSStreamDelegate> {
    id<SNIRCControllerDelegate> delegate;

}
- (void) setDelegate:(id<SNIRCControllerDelegate>)_delegate;
- (void) test;
@end

实施：

@implementation SNIRCController

- (void) setDelegate:(id<SNIRCControllerDelegate>)_delegate {
    _delegate = delegate;
}
- (void) test {
    [delegate serverTalked:@"test"];

}

但由于某种原因[delegate serverTalked:@"test"];没有调用委托：/ 这就是我在AppDelegate上的表现：

@interface AppDelegate : NSObject <NSApplicationDelegate, NSStreamDelegate, SNIRCControllerDelegate> {

    IBOutlet NSTextView *logField;
    SNIRCController *ircController;
}

@property (assign) IBOutlet NSWindow *window;

-(void)writeToLog:(NSString*)data;

@end

@implementation AppDelegate

@synthesize window = _window;

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    ircController = [[SNIRCController alloc] init];
    [ircController setDelegate:self];

    [ircController test];
}
- (void) serverTalked:(id)data {
    NSLog(@"got called :D");
}

-(void)writeToLog:(NSString*)data {

    NSAttributedString *stringToAppend = [[NSAttributedString alloc] initWithString:[NSString stringWithFormat:@"%@\n", data]];
    [[logField textStorage] appendAttributedString:stringToAppend];

}

但serverTalked:没有被调用:(我做错了什么？

Answer 1

在setDelegate:的实施中，这个：

_delegate = delegate;

应该是：

delegate = _delegate;

你感到困惑并交换了ivar和参数。这种混淆可能是因为下划线前缀更常用于ivars。在您的情况下，它是以下划线为前缀的参数。

我的委托行动未在Cocoa中调用

1 个答案: