[英]Facebook SDK Singleton in xcode auto login before post?
按照Facebook教程的指示,我已经在APPDelegate中使用了Facebook SDK,但是我试图将其放入单例方法中。 我发现的每个教程似乎都是针对较旧版本的SDK的,但是我成功地通过此http://indiedevstories.com/2011/08/30/a-facebook-reusable-class/
我遇到2个问题,第一个问题发布在这里,这是第二个问题:
我希望有一个按钮可以发布到Facebook,但是如果用户未登录,则他们需要先登录然后发布(不必先按下单独的登录按钮)。 我可以很好的登录,也可以发布好,但是我不能一起做。 如果未登录,则邮政编码显示登录屏幕,但登录后不会进入帖子屏幕。您必须再次按发布。 如果您尝试登录但已经登录,那么什么也不会发生。 因此,在按钮上,我使用代码登录然后发布,因为如果已经登录,则跳过登录。我遇到的问题是,登录代码在登录代码之后立即运行,因此在用户输入之前机会登录。 这将导致打开2个弹出窗口(1个登录名和1个帖子,其中显示登录名尚未登录)。
我怎样才能让我的代码等待用户登录,然后再转到要发布的代码的下一行?
FacebookHelper.h
@interface FacebookHelper : NSObject <FBSessionDelegate, FBRequestDelegate, FBDialogDelegate, FBLoginDialogDelegate> {
Facebook *_facebook;
NSArray *_permissions;
}
@property (nonatomic,strong) Facebook *facebook;
+(FacebookHelper *) sharedInstance;
+(void)fbDidLogin;
#pragma mark - Public Methods
-(BOOL) isFBSessionValid;
-(void) login;
-(void) logout;
-(void) postToWallWithDialogNewHighscore:(int)highscore;
@end
FacebookHelper.m
@implementation FacebookHelper
@synthesize facebook;
#pragma mark -
#pragma mark Singleton Variables
static FacebookHelper *singletonDelegate = nil;
#pragma mark -
#pragma mark Singleton Methods
+(FacebookHelper *)sharedInstance
{
@synchronized(self) {
if (singletonDelegate == nil) {
singletonDelegate = [[self alloc] init]; // Assignment not done here
}
}
return singletonDelegate;
}
-(id)init
{
self = [super init];
if (self) {
_facebook = [[Facebook alloc] initWithAppId:kAppId andDelegate:self];
// Restore previous session
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if ([defaults objectForKey:@"FBAccessTokenKey"] && [defaults objectForKey:@"FBExpirationDateKey"]) {
_facebook.accessToken = [defaults objectForKey:@"FBAccessTokenKey"];
_facebook.expirationDate = [defaults objectForKey:@"FBExpirationDateKey"];
}
//
}
return self;
}
+(id)allocWithZone:(NSZone *)zone
{
@synchronized(self) {
if (singletonDelegate == nil) {
singletonDelegate = [super allocWithZone:zone];
// assignment and return on first allocation
return singletonDelegate;
}
}
//on subsequent allocation attemps, return nil
return nil;
}
-(id)copyWithZone:(NSZone *)zone
{
return self;
}
#pragma mark - Facebook Delegate Methods
-(void)fbDidLogin
{
NSLog(@"fbDidLogin");
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:[_facebook accessToken] forKey:@"FBAccessTokenKey"];
[defaults setObject:[_facebook expirationDate] forKey:@"FBExpirationDateKey"];
[defaults synchronize];
}
-(void)fbDidLogout
{
NSLog(@"fbDidLogout");
// Remove saved authorisation information if it exists
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if ([defaults objectForKey:@"FBAccessTokenKey"]) {
[defaults removeObjectForKey:@"FBAccessTokenKey"];
[defaults removeObjectForKey:@"FBExpirationDateKey"];
[defaults synchronize];
}
}
#pragma mark - Public Methods
-(NSMutableDictionary *) buildPostParamsWithHighScore:(int)highscore
{
NSString *customMessage = [NSString stringWithFormat:kCustomMessage, highscore, kAppName];
NSString *postName = kAppName;
NSString *serverLink = [NSString stringWithFormat:kServerLink];
NSString *imageSrc = kImageScr;
//Final params build
NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:
//@"message", @"message",
imageSrc, @"picture",
serverLink, @"link",
postName, @"name",
@" ", @"caption",
customMessage, @"description",
nil];
return params;
}
-(BOOL) isFBSessionValid
{
// Check if there is a valid session
//_facebook = [[Facebook alloc] initWithAppId:kAppId andDelegate:self];
_facebook.accessToken = [[NSUserDefaults standardUserDefaults] objectForKey:@"FBAccessTokenKey"];
_facebook.expirationDate = [[NSUserDefaults standardUserDefaults] objectForKey:@"FBExpirationDateKey"];
NSLog(@"accessToken=%@ expirationDaate=%@",_facebook.accessToken,_facebook.expirationDate);
if (![_facebook isSessionValid]) {
NSLog(@"FacebookHelper isFBSessionValid = NO");
return NO;
} else {
NSLog(@"FacebookHelper isFBSessionValid = YES");
return YES;
}
return NO;
}
-(void) login
{
NSLog(@"FacebookHelper login");
_permissions = [NSArray arrayWithObjects:@"publish_stream", nil]; //@"read_stream", @"offline_access"
[_facebook authorize:_permissions];
}
-(void) logout
{
[_facebook logout];
}
-(void) postToWallWithDialogNewHighscore:(int)highscore
{
NSMutableDictionary *params = [self buildPostParamsWithHighScore:highscore];
NSLog(@"Post Feed");
[_facebook dialog:@"feed" andParams:params andDelegate:self];
}
@end
按钮动作:
- (IBAction)facebookTest:(id)sender {
[[FacebookHelper sharedInstance] login];
[[FacebookHelper sharedInstance] postToWallWithDialogNewHighscore:123];
}
我更新了单例课程,将分数发布到Facebook Wall。 查看新版本: http : //indiedevstories.com/2012/04/11/facebookscorer-post-highscores-to-users-facebook-wall/
当需要授权和登录时,此新版本可以正确处理内部状态。
高温超导
您需要做的是让postToWallWithDialogNewHighscore调用登录名(如果有必要),然后等待FBSession委托的回音。 然后,您需要设置您的facebook fbDidLogin委托,以便完成后将其发送回一条消息。 有多种方法可以执行此操作(登录后选择器,NSNotificationCenter等)。 这样的事情应该可以工作(为方便起见,我假设我使用的是NSMutableDictionary * postParams的变量):
-(void)doPost {
NSLog(@"Post Feed");
[_facebook dialog:@"feed" andParams:postParams andDelegate:self];
}
-(void)postToWallWithDialogNewHighscore:(int)highscore
{
postParams = [self buildPostParamsWithHighScore:highscore];
if (_facebook.isSessionValid) {
[self doPost];
} else {
//register an observer for FB login messages
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(postToWallObserver:) name:@"FBLoginComplete" object:nil];
[self login];
}
}
-(void)fbDidLogin {
NSLog(@"token granted until %@", [_facebook expirationDate]);
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:[_facebook accessToken] forKey:@"FBAccessTokenKey"];
[defaults setObject:[_facebook expirationDate] forKey:@"FBExpirationDateKey"];
[defaults synchronize];
[[NSNotificationCenter defaultCenter] postNotificationName:@"FBLoginComplete" object:nil];
}
-(void)fbDidNotLogin:(BOOL)cancelled {
//do nothing as they didn't login
}
-(void) postToWallObserver:(NSNotification *) notification {
if ([[notification name] isEqualToString:@"FBLoginComplete"]) {
if ([_facebook isSessionValid]) {
[self doPost];
}
}
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
注意:我尚未编译此代码,因此可能会有错别字等。
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