修改状态栏字体颜色为白色的方法

1在Info.plist中设置UIViewControllerBasedStatusBarAppearance 为NO
2 在需要改变状态栏颜色的ViewController中在ViewDidLoad方法中增加：
[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];
如果需要在全部View中都变色，可以写在父类的相关方法中，或者写到AppDelegate中。

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