iOS状态栏

在Targets->General->勾选中Hide status bar 

整个项目隐藏状态栏

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2.单个界面隐藏状态栏,例如登录注册页面

1.首先在info.plist里面View controller-based status bar appearance 设置为 NO.
2.在需要调控状态栏的ViewController类中添加以下代码:
//进入时隐藏
-(void)viewWillAppear:(BOOL)animated
{
  [super viewWillAppear:animated];
  //隐藏=YES,显示=NO; Animation:动画效果
  [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationNone];
}
//退出时显示
-(void)viewWillDisappear:(BOOL)animated
{
  [super viewWillDisappear:animated];
//隐藏=YES,显示=NO; Animation:动画效果
  [[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationNone];
}

3.启动页隐藏状态栏,进入程序后正常显示状态栏

1 .首先在Targets->General->勾选中Hide status bar或者在info.plist里面 Status bar is initially hidden 设置为 YES
2.在AppDelegate.m中添加代码
-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{
[application setStatusBarHidden:NO withAnimation:UIStatusBarAnimationFade];
}