Question

我收到来自Xcode实例方法'connect：'未找到的警告（返回类型默认为'id'）。

我仍然是编程和关于xmpp消息传递的旧教程的新手。这是我的代码：

AppDelegate.h

`#import <UIKit/UIKit.h>

#import "XMPP.h"


@class ViewController;

@interface AppDelegate : NSObject {
    UIWindow *window;
    ViewController *viewController;
    XMPPStream *xmppStream;
    NSString *password;
    BOOL isOpen;
}//UIResponder <UIApplicationDelegate>




@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet ViewController *viewController;
@property (nonatomic, readonly) XMPPStream *xmppStream;
- (BOOL) connect;
- (void) disconnect;


@end
`

和

Apdelegate.m

#import "AppDelegate.h"
#import "ViewController.h"

@interface AppDelegate()


- (void) setupStream;
-(void) goOnline;
- (void) goOffline;

@end


@implementation AppDelegate

@synthesize xmppStream;
@synthesize window;
@synthesize viewController;


- (void)applicationWillResignActive:(UIApplication *)application
{
    [self disconnect]; // not sure, maybe leave it open


    // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
    // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}

- (void)applicationDidEnterBackground:(UIApplication *)application
{
    [self connect]; // also not sure, verify the top

    // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}

- (void)applicationWillEnterForeground:(UIApplication *)application
{
    // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
    [self connect];
    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}

- (void)applicationWillTerminate:(UIApplication *)application
{
    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    return YES;
}



- (void)setupStream {
    xmppStream = [[XMPPStream alloc] init];
    [xmppStream addDelegate:self delegateQueue:dispatch_get_main_queue()];
}

-(void)goOnline {
    XMPPPresence *presence= [XMPPPresence presence];
    [[self xmppStream] sendElement:presence];
}

- (void)goOffline {
    XMPPPresence *presence = [XMPPPresence presenceWithType:@"unavailable"];
    [[self xmppStream] sendElement:presence];
}


- (BOOL)connect {

    [self setupStream];

    NSString *jabberID = [[NSUserDefaults standardUserDefaults] stringForKey:@"userID"];
    NSString *myPassword = [[NSUserDefaults standardUserDefaults] stringForKey:@"userPassword"];

    if (![xmppStream isDisconnected]) {
        return YES;
    }


    if (jabberID == nil || myPassword == nil) {

        return NO;
    }

    [xmppStream setMyJID:[XMPPJID jidWithString:jabberID]];
    password = myPassword;

    NSError *error = nil;
    if (![xmppStream connect:&error])
    {
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error"
                                                            message:[NSString stringWithFormat:@"Can't connect to server %@", [error localizedDescription]]
                                                           delegate:nil
                                                  cancelButtonTitle:@"Ok"
                                                  otherButtonTitles:nil];
        [alertView show];
        [alertView release];


        return NO;
    }

    return YES;
}

-(void) disconnect {
    [self goOffline];
    [xmppStream disconnect];

}


@end

我遇到的问题是if（！[xmppStream connect：＆amp; error]）

Answer 1

解决方案是使用：

if (![xmppStream connectWithTimeout:XMPPStreamTimeoutNone error:&error])

在XMPP样本中找到它

实例方法'connect：'not found（返回类型默认为'id'

1 个答案: