Faultless to avoid any warnings

I want to avoid any warnings when compiling my App, now I got some warnings from Open Source as below, there is a warning in initWithRootViewController, because it needs a class UIViewController as parameter, what can I do?

Code:

@interface InAppSettingsModalViewController : UIViewController {
}
@end

@implementation InAppSettingsModalViewController

- (id)init{
    InAppSettingsViewController *settings = [[InAppSettingsViewController alloc] init];
    self = [[UINavigationController alloc] initWithRootViewController:settings];
    [settings addDoneButton];
    [settings release];
    return self;
}

@end

 

Code:

#import "InAppSettings.h"
#import "InAppSettingsSpecifier.h"
#import "InAppSettingsConstants.h"
#import "InAppSettingsPSMultiValueSpecifierTable.h"

 

some other warnings are here:

warning1:
'NSObject' may not respond to 'connection:didReceiveResponse:'

Code:

#pragma mark NSURLConnection Delegate methods

- (void)connection:(NSURLConnection *)aConnection didReceiveResponse:(NSURLResponse *)response{
	assert(aConnection = connection);
	NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
	if ([response respondsToSelector: @selector(allHeaderFields)]){
		self.contentType = [[(NSHTTPURLResponse*)response allHeaderFields] valueForKey: @"Content-Type"];
		encoding = [NSString encodingForContentType: contentType];
		if ([contentType rangeOfString: @"html" options: NSCaseInsensitiveSearch].location != NSNotFound)
			parser.mode = ElementParserModeHTML;
		else
			parser.mode = ElementParserModeXML;
	}
	if ([connectionDelegate respondsToSelector:@selector(connection:didReceiveResponse:)])
		[COLOR="Red"][connectionDelegate connection:connection didReceiveResponse: response];[/COLOR]
	[pool release];
}

warning2:
Declaration of 'struct sockaddr_in' will not be visible outside of this function

Code:

// Use to check the reachability of a particular IP address. 
+ (Reachability *) reachabilityWithAddress: (const struct sockaddr_in*) hostAddress;

This code is from a Open Source InAppSettings at https://bitbucket.org/keegan3d/inappsettings/src/0d2d8574de9f/InAppSettings/InAppSettings.m

By the way, the code can be used and Modal View Controller can be shown.