我目前正在构建一个本地 Google Reader iPhone 应用程序，类似于成功的应用程序“Reeder for iPhone”，但是，它还内置了一个完整的 Twitter 客户端。
我已经完成了 Twitter 客户端，现在正在努力启动 Google Reader 客户端。我浏览了多个文档并查看了 gdata-objective-client 示例，但我似乎仍然无法理解要完成与 Reeder 相同的功能需要做什么。
基本上我希望能够向用户展示一个登录屏幕。然后用户提交他们的凭据和访问令牌，所有这些都是在幕后完成的，就像他们使用 Twitter 的 xAuth 一样。然后我想推送一个视图控制器，它显示一个 UITableView 以及所有当前未读的提要。当用户单击 UITableViewCell 时，会分别推送包含帖子内容的详细视图。
这可能吗？如果可以，我该如何实现这些功能？如果人们发布“代码片段”并实际展示他们如何实现实现，我将不胜感激。
提前致谢！
编辑：我注意到不需要谷歌应用引擎。然而，问题仍然是一样的。我将如何在我的应用程序中实现 Google Reader？
就这么简单。对于所有想连接到 Google Reader API 的人，我做了以下操作。
/* Google clientLogin API:
Content-type: application/x-www-form-urlencoded
Email=userName
Passwd=password
accountType=HOSTED_OR_GOOGLE
service=xapi
source = @"myComp-myApp-1.0"
*/
//define our return objects
BOOL authOK;
NSString *authMessage = [[NSString alloc] init];
NSArray *returnArray = nil;
//begin NSURLConnection prep:
NSMutableURLRequest *httpReq = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:GOOGLE_CLIENT_AUTH_URL] ];
[httpReq setTimeoutInterval:30.0];
//[httpReq setCachePolicy:NSURLRequestReloadIgnoringCacheData];
[httpReq setHTTPMethod:@"POST"];
//set headers
[httpReq addValue:@"Content-Type" forHTTPHeaderField:@"application/x-www-form-urlencoded"];
//set post body
NSString *requestBody = [[NSString alloc]
initWithFormat:@"Email=%@&Passwd=%@&service=reader&accountType=HOSTED_OR_GOOGLE&source=%@",
gUserString, gPassString, [NSString stringWithFormat:@"%@%d", gSourceString]];
[httpReq setHTTPBody:[requestBody dataUsingEncoding:NSASCIIStringEncoding]];
NSHTTPURLResponse *response = nil;
NSError *error = nil;
NSData *data = nil;
NSString *responseStr = nil;
NSArray *responseLines = nil;
NSString *errorString;
//NSDictionary *dict;
int responseStatus = 0;
//this should be quick, and to keep same workflow, we'll do this sync.
//this should also get us by without messing with threads and run loops on Tiger.
data = [NSURLConnection sendSynchronousRequest:httpReq returningResponse:&response error:&error];
if ([data length] > 0) {
responseStr = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
//NSLog(@"Response From Google: %@", responseStr);
responseStatus = [response statusCode];
//dict = [[NSDictionary alloc] initWithDictionary:[response allHeaderFields]];
//if we got 200 authentication was successful
if (responseStatus == 200 ) {
authOK = TRUE;
authMessage = @"Successfully authenticated with Google. You can now start viewing your unread feeds.";
}
//403 = authentication failed.
else if (responseStatus == 403) {
authOK = FALSE;
//get Error code.
responseLines = [responseStr componentsSeparatedByString:@"\n"];
//find the line with the error string:
int i;
for (i =0; i < [responseLines count]; i++ ) {
if ([[responseLines objectAtIndex:i] rangeOfString:@"Error="].length != 0) {
errorString = [responseLines objectAtIndex:i] ;
}
}
errorString = [errorString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
/*
Official Google clientLogin Error Codes:
Error Code Description
BadAuthentication The login request used a username or password that is not recognized.
NotVerified The account email address has not been verified. The user will need to access their Google account directly to resolve the issue before logging in using a non-Google application.
TermsNotAgreed The user has not agreed to terms. The user will need to access their Google account directly to resolve the issue before logging in using a non-Google application.
CaptchaRequired A CAPTCHA is required. (A response with this error code will also contain an image URL and a CAPTCHA token.)
Unknown The error is unknown or unspecified; the request contained invalid input or was malformed.
AccountDeleted The user account has been deleted.
AccountDisabled The user account has been disabled.
ServiceDisabled The user's access to the specified service has been disabled. (The user account may still be valid.)
ServiceUnavailable The service is not available; try again later.
*/
if ([errorString rangeOfString:@"BadAuthentication" ].length != 0) {
authMessage = @"Please Check your Username and Password and try again.";
}else if ([errorString rangeOfString:@"NotVerified"].length != 0) {
authMessage = @"This account has not been verified. You will need to access your Google account directly to resolve this";
}else if ([errorString rangeOfString:@"TermsNotAgreed" ].length != 0) {
authMessage = @"You have not agreed to Google terms of use. You will need to access your Google account directly to resolve this";
}else if ([errorString rangeOfString:@"CaptchaRequired" ].length != 0) {
authMessage = @"Google is requiring a CAPTCHA response to continue. Please complete the CAPTCHA challenge in your browser, and try authenticating again";
//NSString *captchaURL = [responseStr substringFromIndex: [responseStr rangeOfString:@"CaptchaURL="].length];
//either open the standard URL in a browser, or show a custom sheet with the image and send it back...
//parse URL to append to GOOGLE_CAPTCHA_URL_PREFIX
//but for now... just launch the standard URL.
//[[NSWorkspace sharedWorkspace] openURL:[NSURL URLWithString:GOOGLE_CAPTCHA_STANDARD_UNLOCK_URL]];
}else if ([errorString rangeOfString:@"Unknown" ].length != 0) {
authMessage = @"An Unknow error has occurred; the request contained invalid input or was malformed.";
}else if ([errorString rangeOfString:@"AccountDeleted" ].length != 0) {
authMessage = @"This user account previously has been deleted.";
}else if ([errorString rangeOfString:@"AccountDisabled" ].length != 0) {
authMessage = @"This user account has been disabled.";
}else if ([errorString rangeOfString:@"ServiceDisabled" ].length != 0) {
authMessage = @"Your access to the specified service has been disabled. Please try again later.";
}else if ([errorString rangeOfString:@"ServiceUnavailable" ].length != 0) {
authMessage = @"The service is not available; please try again later.";
}
}//end 403 if
}
//check most likely: no internet connection error:
if (error != nil) {
authOK = FALSE;
if ( [error domain] == NSURLErrorDomain) {
authMessage = @"Could not reach Google.com. Please check your Internet Connection";
}else {
//other error
authMessage = [authMessage stringByAppendingFormat:@"Internal Error. Please contact notoptimal.net for further assistance. Error: %@", [error localizedDescription] ];
}
}
//NSLog (@"err localized description %@", [error localizedDescription]) ;
//NSLog (@"err localized failure reasons %@", [error localizedFailureReason]) ;
//NSLog(@"err code %d", [error code]) ;
//NSLog (@"err domain %@", [error domain]) ;
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Authentication" message:authMessage delegate:self cancelButtonTitle:@"Okay" otherButtonTitles:nil];
[alertView show];
[alertView release];
[gUserString release];
[gPassString release];
[gSourceString release];
[authMessage release];
}
}
显然，我使用了自己的代表等，但这是我带给我的应用程序的整体需求/感觉。
我目前正在将未读提要/项目拉入 UITableView 以显示在我的 RootViewController 中。我会用更多信息更新这个。
感谢所有试图提供帮助的人：D
谢谢你。我知道有一种简单的登录方式，但我很难弄清楚它。顺便说一句，对于那些正在复制/粘贴上面 the0rkus 代码的人 - 你会遇到一些错误。为了测试它，我添加了：
NSString *gUserString = @"yourlogin@gmail.com";
NSString *gPassString = @"yourpassword";
NSString *GOOGLE_CLIENT_AUTH_URL = @"https://www.google.com/accounts/ClientLogin?client=YourClient";
NSString *gSourceString = @"YourClient";
谷歌一下，那里有很多描述如何使用谷歌阅读器 API 的博客。这是一个不错的起点： http: //mindsharestrategy.com/google-reader-api-a-brief-tutorial/