iOS设置自定义全局返回按钮

//自定义返回按钮  (全局设置)

    UIImage *backButtonImage = [[UIImage imageNamed:@"back"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 30, 0, 0)];

    [[UIBarButtonItem appearance] setBackButtonBackgroundImage:backButtonImage forState:UIControlStateNormalbarMetrics:UIBarMetricsDefault];

    //将返回按钮的文字position设置不在屏幕上显示

    [[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(NSIntegerMin, NSIntegerMin)forBarMetrics:UIBarMetricsDefault];

原文地址：http://blog.csdn.net/iotjin/article/details/51177730