导航栏返回按钮重写
UIBarButtonItem *backBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[[UIImage imageNamed:@"返回"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal] style:UIBarButtonItemStylePlain target:selfaction:@selector(backAction)];
self.navigationItem.leftBarButtonItem = backBarButtonItem;
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