一 继承navgationcontroller
let navigationBar = UINavigationBar.appearance()
navigationBar.tintColor = fontcolor
//返回按钮的箭头颜色
// [navigationBar setTintColor:[UIColor colorWithRed:0.984 green:0.000 blue:0.235 alpha:1.000]];
//设置返回样式图片
// let buttonItem = [UIBarButtonItem appearanceWhenContainedIn:[UINavigationBar class], nil];
let buttonItem =UIBarButtonItem.appearance(whenContainedInInstancesOf: [UINavigationBar.classForCoder() as! UIAppearanceContainer.Type])
let offset:UIOffset = UIOffset(horizontal: -500, vertical: -500)
buttonItem.setBackButtonTitlePositionAdjustment(offset, for: .default)
// [buttonItem setBackButtonTitlePositionAdjustment:offset forBarMetrics:UIBarMetricsDefault];
} ```
http://www.jianshu.com/p/e03cd37db0d5 //可能需要解决的问题收集