iOS 改变电池条颜色方法

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self.navigationController.navigationBar.barStyle = UIStatusBarStyleLightContent;

    UIView* stateView = [[UIView alloc] initWithFrame:CGRectMake(0, -20, Device_Width, 20)];
    [self.navigationController.navigationBar addSubview:stateView];
    stateView.backgroundColor = [UIColor colorWithRed:69/255.0 green:155/255.0 blue:118/255.0 alpha:1];