2 第一次进入聊天界面没有滚动到消息底部?

刚进入界面没有滚动到消息底部?

一开始我是在viewDidLoad中 代码执行scrollToBottom: ,但是执行代码之后发现并没有效果 ;

运行时控制台输出
2014-02-16 22:14:03.631 ViewDidAppear[4306:70b] View Did Load  
2014-02-16 22:14:03.683 ViewDidAppear[4306:70b] View Did Appear  
2014-02-16 22:14:04.793 ViewDidAppear[4306:70b] View Did Disappear  
2014-02-16 22:14:05.829 ViewDidAppear[4306:70b] View Did Appear  
2014-02-16 22:14:11.247 ViewDidAppear[4306:70b] View Did Disappear  
2014-02-16 22:14:12.692 ViewDidAppear[4306:70b] View Did Appear  

可以发现 viewDidLoad 只执行了一次

如果需要每次进入界面都要执行的操作应该放在viewDidAppear 中

参照🔗:关于viewDidLoad 和viewDidAppear的区别