iOS7状态栏字体改为白色

方案1：

1，在Info.plist中设置View controller-based status bar appearance为NO

2，修改状态栏的字体颜色为白色：

[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleLightContent;

如果只修改某个ViewController，将上面的代码加到ViewDidLoad中

如果需要在全部View中都变色，将上面的代码加到AppDelegate中。

方案2：

1，在Info.plist中设置View controller-based status bar appearance为YES

2，在viewWillAppear中调用RefreshStatusBarStyle设置状态栏颜色

- (void)RefreshStatusBarStyle:(UIStatusBarStyle)barStyle {
    NSLog(@"RefreshStatusBarStyle");
    mStatusBarStyle = barStyle;
    if (IOS_7) {
        if ([self respondsToSelector:@selector(setNeedsStatusBarAppearanceUpdate)]) {
            [self preferredStatusBarStyle];
            [self performSelector:@selector(setNeedsStatusBarAppearanceUpdate)];
        }
    }
    else {
        [UIApplication sharedApplication].statusBarStyle = barStyle;
    }
}



- (UIStatusBarStyle)preferredStatusBarStyle {
    NSLog(@"preferredStatusBarStyle :%@", [self class]);
    return mStatusBarStyle;
}