キー ウィンドウに透明なビューを追加し、それを閉じるタップ ジェスチャ レコグナイザーと、コンテンツを表示するサブビューを追加できます。
#define OVERLAY_TAG 997
-(void)showTutorial
{
UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
UIView *overlay = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds];
overlay.backgroundColor = [UIColor clearColor];
overlay.userInteractionEnabled = YES;
[keyWindow addSubview:overlay];
UITapGestureRecognizer * tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self
action:@selector(dismissTutorial)];
CGFloat border = 10;
CGRect frame = overlay.bounds;
// 20 is the status bar height (sorry for using the number)
frame = CGRectMake(border, border + 20, frame.size.width - border * 2, frame.size.height - border * 2 - 20);
// the black view in the example is probably a scroll view
UIView *blackView = [[UIView alloc] initWithFrame:frame];
blackView.backgroundColor = [UIColor blackColor];
blackView.alpha = 0.0;
[overlay addSubview:dimView];
// add all the subviews for your tutorial
// make it appear with an animation
[UIView animateWithDuration:0.3
animations:^{dimView.alpha = 1;}
completion:^(BOOL finished){[overlay addGestureRecognizer:tapRecognizer];}];
}
-(void)dismissTutorial
{
UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
UIView *overlay = [keyWindow viewWithTag:OVERLAY_TAG];
[UIView animateWithDuration:0.3
animations:^{
overlay.alpha = 0.0;
}
completion:^(BOOL finished){
[overlay removeFromSuperview];
}];
}
この方法では、タップするだけでチュートリアルを削除できますが、たとえばボタンを使用できます。