if ([self respondsToSelector:@selector(setNeedsStatusBarAppearanceUpdate)]) {
// iOS 7
[self prefersStatusBarHidden];
[self performSelector:@selector(setNeedsStatusBarAppearanceUpdate)];
}
- (BOOL)prefersStatusBarHidden
{
return YES;//隱藏為YES，顯示為NO

}

或者設置plist文件全局

設置key：Status bar is initially hidden YES

設置key：View controller-based status bar appearance NO