- 默认：
UIStatusBarStyleDefault
- 白色：
UIStatusBarStyleLightContent
- 当前页面状态栏设置为白色
- (void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleLightContent;//变白
}
-(void)viewWillDisappear:(BOOL)animated{
[super viewWillDisappear:animated];
[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleDefault;//变黑
}
