分享到新浪微博（二）

这篇博客说明一些使用“JimLiu-WeiboSDK”的一些关键代码段，关于“JimLiu-WeiboSDK”的使用请参考：http://blog.youkuaiyun.com/workhardupc100/article/details/6802424

1. 创建并初始化OAuthEngine

- (void)viewDidAppear:(BOOL)animated {

[super viewDidAppear:animated];

/// 初始化engine

if (!_engine) {

_engine = [[OAuthEngine alloc] initOAuthWithDelegate: self];

_engine.consumerKey = kOAuthConsumerKey;

_engine.consumerSecret = kOAuthConsumerSecret;

_engine.username = 如果之前认证过且保存过信息，则取出认证的用户名（其实是用户id）

}

}

2. 进行认证

－ (void)Auth{

UIViewController *controller = [OAuthController controllerToEnterCredentialsWithEngine: _engine delegate: self];

if (controller){

/** 此时表示没有认证过，则会弹出认证的WebView界面 */

[self presentModalViewController: controller animated: YES];

}

else{

/** 此时表示已认证过 */

[OAuthEngine setCurrentOAuthEngine:_engine];

}

3. 实现OAuthEngineDelegate中的方法，用户保存和获取认证过的数据

/// 保存获取的认证的数据

- (void) storeCachedOAuthData: (NSString *) data forUsername: (NSString *) username{

if (username == nil) {

return;

}

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

[defaults setObject: data forKey:username];

[defaults synchronize];

}

/// 获取保存的认证的数据

- (NSString *) cachedOAuthDataForUsername: (NSString *) username {

if (username == nil) {

return @"";

}

return [[NSUserDefaults standardUserDefaults] objectForKey: username];

}

/// 认证失败时的回调函数

- (void) oAuthConnectionFailedWithData: (NSData *) data {

// 认证失败的处理

}

4. 认证后，发表一个微博

- (void)postNewStatus{

if (![_engine isAuthorized]) /// 判断下是否认证过，因为isAuthorized做了一些特殊处理，有必要调用

return;

[OAuthEngine setCurrentOAuthEngine:_engine]; /// 设置OAuthEngine

WeiboClient *client = [[WeiboClient alloc] initWithTarget:self

engine:[OAuthEngine currentOAuthEngine] action:@selector(postStatusDidSucceed:obj:)];

[client post:@"Hello World"];

}

///isAuthorized的实现细节

- (BOOL) isAuthorized {

if (_accessToken.key && _accessToken.secret) return YES;

NSString *accessTokenString = [_delegate respondsToSelector: @selector(cachedOAuthDataForUsername:)] ? [(id) _delegate cachedOAuthDataForUsername: self.username] : @"";

if (accessTokenString.length) {

[_accessToken release];

_accessToken = [[OAToken alloc] initWithHTTPResponseBody: accessTokenString];

self.username = [self extractUsernameFromHTTPBody: accessTokenString];

if (_accessToken.key && _accessToken.secret)

return YES;

}

[_accessToken release]; // no access token found. create a new empty one

_accessToken = [[OAToken alloc] initWithKey: nil secret: nil];

return NO;

}