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所以我有一個應用程序需要使用OAuth2訪問Google的數據。我有方法刷新存儲的數據並將新帳戶添加到應用程序中。我一直在使用兩個帳戶進行測試。使用一個帳戶登錄我沒有任何問題，使用該帳戶刷新也沒問題（首先）。在同時簽署我的第二個帳戶並同時刷新兩組數據方面，我沒有任何問題。然而，在長時間的缺席之後，我回來嘗試刷新一個或兩個帳戶，並崩潰。從我的日誌中我推斷出令牌不再有用，服務器也不再給我回數據。每次我發送請求時，首先使用刷新令牌刷新我的訪問令牌，這些令牌保存在手機內存中。Google OAuth令牌在一段時間後停止工作（iOS 7應用）
Q1：我是否正確評估了問題，即我的令牌有問題嗎？
問題2：刷新令牌在給定時間段後過期嗎？
如果是Q3：我該如何解決這個問題？
這裏是我的代碼段，從令牌刷新的數據請求：
NSString *post = [NSString stringWithFormat:@"client_id=%@&client_secret=%@&refresh_token=%@&grant_type=refresh_token", mAuth.clientID, mAuth.clientSecret, [self.defaults objectForKey:[NSString stringWithFormat:@"refresh_token %i", i]]];
NSLog(@"AT - %@", [self.defaults objectForKey:[NSString stringWithFormat:@"access_token %i", i]]);
NSLog(@"TT - %@", [self.defaults objectForKey:[NSString stringWithFormat:@"token_type %i", i]]);
NSLog(@"ET - %@", [self.defaults objectForKey:[NSString stringWithFormat:@"expires_in %i", i]]);
NSLog(@"RT - %@", [self.defaults objectForKey:[NSString stringWithFormat:@"refresh_token %i", i]]);
NSLog(@"%@", post);
NSMutableData *postData = [NSMutableData data];
[postData appendData:[post dataUsingEncoding:NSASCIIStringEncoding]];
NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc]init];
[request setURL:[NSURL URLWithString:[NSString stringWithFormat:@"https://accounts.google.com/o/oauth2/token"]]];
[request setHTTPMethod:@"POST"];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:postData];
NSURLResponse *response;
NSError *error;
NSData *connection = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
NSString *tokenString = [[NSString alloc]initWithData:connection encoding:NSUTF8StringEncoding];
NSLog(@"%@", tokenString);
[self complexParseFromString:tokenString forInt:i];
NSLog(@"AT - %@", [self.defaults objectForKey:[NSString stringWithFormat:@"access_token %i", i]]);
NSLog(@"TT - %@", [self.defaults objectForKey:[NSString stringWithFormat:@"token_type %i", i]]);
NSLog(@"ET - %@", [self.defaults objectForKey:[NSString stringWithFormat:@"expires_in %i", i]]);
NSLog(@"RT - %@", [self.defaults objectForKey:[NSString stringWithFormat:@"refresh_token %i", i]]);
NSMutableURLRequest *GETRequest = [[NSMutableURLRequest alloc]initWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"https://www.googleapis.com/youtube/v3/channels?part=contentDetails&mine=true"]]];
[GETRequest setHTTPMethod:@"GET"];
[GETRequest setValue:@"www.googleapis.com" forHTTPHeaderField:@"Host"];
[GETRequest setValue:[NSString stringWithFormat:@"Bearer %@", [self.defaults objectForKey:[NSString stringWithFormat:@"access_token %i", i]]] forHTTPHeaderField:@"Authorization"];
connection = [NSURLConnection sendSynchronousRequest:GETRequest returningResponse:&response error:&error];
responderString = [[NSString alloc]initWithData:connection encoding:NSUTF8StringEncoding];
arrayChannel = [[NSMutableArray alloc]initWithArray:[self simpleParseFromString:responderString]];
GETRequest = [[NSMutableURLRequest alloc]initWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"https://www.googleapis.com/youtube/v3/playlistItems?part=contentDetails&playlistId=%@", [arrayChannel objectAtIndex:[arrayChannel indexOfObject:@"uploads"] + 1]]]];
[GETRequest setHTTPMethod:@"GET"];
[GETRequest setValue:@"www.googleapis.com" forHTTPHeaderField:@"Host"];
[GETRequest setValue:[NSString stringWithFormat:@"Bearer %@", [self.defaults objectForKey:[NSString stringWithFormat:@"access_token %i", i]]] forHTTPHeaderField:@"Authorization"];
connection = [NSURLConnection sendSynchronousRequest:GETRequest returningResponse:&response error:&error];
responderString = [[NSString alloc]initWithData:connection encoding:NSUTF8StringEncoding];