{"action":"created","issue":{"url":"https://api.github.com/repos/rickytan/RTRootNavigationController/issues/22","repository_url":"https://api.github.com/repos/rickytan/RTRootNavigationController","labels_url":"https://api.github.com/repos/rickytan/RTRootNavigationController/issues/22/labels{/name}","comments_url":"https://api.github.com/repos/rickytan/RTRootNavigationController/issues/22/comments","events_url":"https://api.github.com/repos/rickytan/RTRootNavigationController/issues/22/events","html_url":"https://github.com/rickytan/RTRootNavigationController/issues/22","id":174459557,"number":22,"title":"有一个疑问，为什么推荐使用customBackItemWithTarget来设置backItem，而不是使用系统的呢？useSystemBackBarButtonItem","user":{"login":"songhailiang","id":11569411,"avatar_url":"https://avatars.githubusercontent.com/u/11569411?v=3","gravatar_id":"","url":"https://api.github.com/users/songhailiang","html_url":"https://github.com/songhailiang","followers_url":"https://api.github.com/users/songhailiang/followers","following_url":"https://api.github.com/users/songhailiang/following{/other_user}","gists_url":"https://api.github.com/users/songhailiang/gists{/gist_id}","starred_url":"https://api.github.com/users/songhailiang/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/songhailiang/subscriptions","organizations_url":"https://api.github.com/users/songhailiang/orgs","repos_url":"https://api.github.com/users/songhailiang/repos","events_url":"https://api.github.com/users/songhailiang/events{/privacy}","received_events_url":"https://api.github.com/users/songhailiang/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2016-09-01T07:56:48Z","updated_at":"2016-09-01T15:37:14Z","closed_at":"2016-09-01T15:37:14Z","body":"主要是考虑了哪些方面的因素呢？\r\n还望能指点一下，感谢！"},"comment":{"url":"https://api.github.com/repos/rickytan/RTRootNavigationController/issues/comments/244119085","html_url":"https://github.com/rickytan/RTRootNavigationController/issues/22#issuecomment-244119085","issue_url":"https://api.github.com/repos/rickytan/RTRootNavigationController/issues/22","id":244119085,"user":{"login":"rickytan","id":1250207,"avatar_url":"https://avatars.githubusercontent.com/u/1250207?v=3","gravatar_id":"","url":"https://api.github.com/users/rickytan","html_url":"https://github.com/rickytan","followers_url":"https://api.github.com/users/rickytan/followers","following_url":"https://api.github.com/users/rickytan/following{/other_user}","gists_url":"https://api.github.com/users/rickytan/gists{/gist_id}","starred_url":"https://api.github.com/users/rickytan/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rickytan/subscriptions","organizations_url":"https://api.github.com/users/rickytan/orgs","repos_url":"https://api.github.com/users/rickytan/repos","events_url":"https://api.github.com/users/rickytan/events{/privacy}","received_events_url":"https://api.github.com/users/rickytan/received_events","type":"User","site_admin":false},"created_at":"2016-09-01T15:37:14Z","updated_at":"2016-09-01T15:37:14Z","body":"为了让系统的出来，我在每个 **VC** 前 push 了一个空的 **VC**，使得真正的 **VC** 是导航器的第二个 **VC**，这样会产生较高的内存占用，代码中我也[注释](https://github.com/rickytan/RTRootNavigationController/blob/master/RTRootNavigationController/Classes/RTRootNavigationController.h#L61)了"}}
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