1. UIWindowLevel

让UIView 和 UIWindow透明不遮挡下放操作的方法

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    UIView *hitView = [super hitTest:point withEvent:event];
    if (hitView == self) {
        return nil;
    } else {
        return hitView;
    }
    
}

设置父视图的的透明度不影响子视图的人透明度的方法

 _settingWindow.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.5];