DMMultiDelegatesProxy forwardInvocation code

DMMultiDelegatesProxy forwardInvocation

- (void)forwardInvocation:(NSInvocation *)invocation {
	// check if method can return something
    BOOL methodReturnSomething = (![[NSString stringWithCString:invocation.methodSignature.methodReturnType encoding:NSUTF8StringEncoding] isEqualToString:@"v"]);
    
	// send invocation to the main delegate and use it's return value
	if ([self.mainDelegate respondsToSelector:invocation.selector])
		[invocation invokeWithTarget:self.mainDelegate];
	
	// make another fake invocation with the same method signature and send the same messages to the other delegates (ignoring return values)
	NSInvocation *targetInvocation = invocation;
	if (methodReturnSomething) {
		targetInvocation = [NSInvocation invocationWithMethodSignature:invocation.methodSignature];
		[targetInvocation setSelector:invocation.selector];
	}
	
	for (NSValue *nonRetainedValue in nonRetainedDelegates) {
		id delegateObj = nonRetainedValue.nonretainedObjectValue;
		if ([delegateObj respondsToSelector:invocation.selector])
			[targetInvocation invokeWithTarget:delegateObj];
    }
}