// 细节: 本界面上设置, 下个界面上显示
// 方式一
self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStylePlain target:nil action:nil];
// 方式二
UIBarButtonItem * backButtonItem = [[UIBarButtonItem alloc] init];
backButtonItem.title = @"返回";
self.navigationItem.backBarButtonItem = backButtonItem;
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摘自:https://blog.csdn.net/u011096206/article/details/50606778
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