问在正在运行的应用程序中更改NSApplicationIcon？

EN

@implementation NSImage (Magic)

+ (void)load {
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    // have to call imageNamed: once prior to swizzling to avoid infinite loop
    [[NSApplication sharedApplication] applicationIconImage];

    // swizzle!
    NSError *error = nil;

    if (![NSImage jr_swizzleClassMethod:@selector(imageNamed:) withClassMethod:@selector(_sensible_imageNamed:) error:&error])
        NSLog(@"couldn't swizzle imageNamed: application icons will not update: %@", error);

    [pool release];
}


+ (id)_sensible_imageNamed:(NSString *)name {
    if ([name isEqualToString:@"NSApplicationIcon"])
        return [[NSApplication sharedApplication] applicationIconImage];

    return [self _sensible_imageNamed:name];
}

@end

+ (BOOL)jr_swizzleClassMethod:(SEL)origSel_ withClassMethod:(SEL)altSel_ error:(NSError**)error_ {
#if OBJC_API_VERSION >= 2
    Method origMethod = class_getClassMethod(self, origSel_);
    if (!origMethod) {
        SetNSError(error_, @"original method %@ not found for class %@", NSStringFromSelector(origSel_), [self className]);
        return NO;
    }

    Method altMethod = class_getClassMethod(self, altSel_);
    if (!altMethod) {
        SetNSError(error_, @"alternate method %@ not found for class %@", NSStringFromSelector(altSel_), [self className]);
        return NO;
    }

    id metaClass = objc_getMetaClass(class_getName(self));

    class_addMethod(metaClass,
                    origSel_,
                    class_getMethodImplementation(metaClass, origSel_),
                    method_getTypeEncoding(origMethod));
    class_addMethod(metaClass,
                    altSel_,
                    class_getMethodImplementation(metaClass, altSel_),
                    method_getTypeEncoding(altMethod));

    method_exchangeImplementations(class_getClassMethod(self, origSel_), class_getClassMethod(self, altSel_));
    return YES;
#else
    assert(0);
    return NO;
#endif
}

- (void)doMagic:(id)sender {
    static int i = 0;

    i = (i+1) % 2;

    if (i)
        [[NSApplication sharedApplication] setApplicationIconImage:[NSImage imageNamed:NSImageNameBonjour]];
    else
        [[NSApplication sharedApplication] setApplicationIconImage:[NSImage imageNamed:NSImageNameDotMac]];

    // any pre-populated image views have to be set to nil first, otherwise their icon won't change
    // [imageView setImage:nil];
    // [imageView setImage:[NSImage imageNamed:NSImageNameApplicationIcon]];

    NSAlert *alert = [[[NSAlert alloc] init] autorelease];
    [alert setMessageText:@"Shazam!"];
    [alert runModal];
}