ios 7 statusbar 状态栏 跟随navigationbar的颜色而改变
首先，我们要搞清楚info.plist中 View controller-based status bar appearance这个属性 View controller-based status bar appearance ＝NO 这个设置为：View Controller 不对status Bar 显示进行操作 然后在viewcontroller里面修改navigationbar的颜色 [[UINavigationBar appearance] setBarTintColor:[UIColor colorWithRed:65/255.0 green:159/255.0 blue:252/255.0 alpha:0.5]]; 官方给出的意思 To customize the appearance of all instances of a class, send the relevant appearance modification messages to the appearance proxy for the class.（自定义的一个类的所有实例的外观，发送相关信息到外观的外观的代理类）For example, to modify the bar tint color for all UINavigationBar instances: [[UINavigationBar