解决帐号问题:点击“Build and Run”,却出现以下提示: Failed to code sign “2048”. No provisioning profiles with a valid signing identity (i.e. certificate and private key pair) matching the bundle identifier “com.facebook.8048” were found. Xcode can attempt to fix this issue. This will reset your code signing and provisioning settings to recommended values and resolve issues with signing identities and provisioning profiles. 没有提供一个合法的证书?xcode仍是很人性化的,直接有个按钮Fix Issue,点击它,而后提示输入帐号密码: 选择choose ok,看起来问题已经fix了,再次点击run,先看到“Build Succeded”,激动,成功了! 而后过又出来一个提示,这又是什么鬼! Could not launch “2048” process lanch failed: Security