设置上一级controller的backBarButtonItem

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设置上一级controller的backBarButtonItem.

self.navigationItem.backBarButtonItem= [[UIBarButtonItem alloc]initWithTitle:@"返回"
                                                                           style:UIBarButtonItemStylePlain
                                                                          target:nil                                                                       
                                                                           action:@selector(back_event:)]; 

设置上一级controller的backBarButtonItem

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原文地址：http://www.cnblogs.com/Cheetah-yang/p/4699614.html