// 自定义导航栏"返回按钮"

- (void)initNaviBackBtn

{

    UIButton *backBtn = [UIButtonbuttonWithType:UIButtonTypeCustom];

    backBtn.frame = CGRectMake(0, 0, 50, 22);

    [backBtn setImage:[UIImageimageNamed:@"backBtn"] forState:UIControlStateNormal];

    [backBtn addTarget:selfaction:@selector(back) forControlEvents:UIControlEventTouchUpInside];

    UIBarButtonItem *backItem = [[UIBarButtonItemalloc] initWithCustomView:backBtn];

    // 控制按钮的左右间距

    UIBarButtonItem *negativeSpacer = [[UIBarButtonItemalloc]

                                       initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace

                                       target:nilaction:nil];

    if (IOS_VERSION_6) {

        negativeSpacer.width = 2;

    } else {

        negativeSpacer.width = -9;

    }

    self.navigationItem.leftBarButtonItems = [NSArrayarrayWithObjects:negativeSpacer, backItem, nil];

    //    self.navigationItem.leftBarButtonItem = backItem;

}

自定义导航栏按钮 baseViewController中写!