iOS：帮助在主视图顶部模糊屏幕

Question

我的应用程序需要在主视图控制器之上提供帮助。我已将标签栏控制器作为根视图控制器并添加了导航视图控制器。因此在第一个屏幕的外观中，标签栏和导航栏与视图主体一起出现.当我尝试通过 pageviewcontroller 示例放置帮助屏幕时，视图确实加载到第一个屏幕选项卡视图中，并且导航栏位于前面，保持页面视图控制器返回。我尝试过

   [self addChildViewController:walkthrough];
   [self.view addSubview:walkthrough.view];
   [self.tabBarController.view bringSubviewToFront:walkthrough.view];

请帮助如何获得页面视图屏幕前面。有没有示例教程请帮助我 注意：botn导航栏和tabbar不应该隐藏

Answer 1

这就是我在我的应用程序中为演练所做的。你可以从这里下载这个 FXBlurView 库： https://github.com/nicklockwood/FXBlurView

在我的 .h 文件中

#import "FXBlurView.h"
IBOutlet UIView *viewWalkThrough;
FXBlurView *overlayView;

在我的 .m 文件中

#define SYSTEM_SCREEN_SIZE [[UIScreen mainScreen] bounds].size
#define kProfileWalkthrough  @"ProfileWalkthrough"

if (![[[NSUserDefaults standardUserDefaults] valueForKey:kProfileWalkthrough] boolValue]) {
    [[NSUserDefaults standardUserDefaults] setBool:YES forKey:kProfileWalkthrough];
    [[NSUserDefaults standardUserDefaults] synchronize];

    overlayView = [[FXBlurView alloc] initWithFrame:CGRectMake(0, 0, SYSTEM_SCREEN_SIZE.width, SYSTEM_SCREEN_SIZE.height)];
    [overlayView setDynamic:YES];
    [overlayView setBlurRadius:5.0f];
    [overlayView setBlurEnabled:YES];
    [overlayView setTintColor:[UIColor blackColor]];
    [self.view.window addSubview:overlayView];
    [self displayOverlay:viewWalkThrough aboveView:self.view.window];

    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(closeWalkThrough:)];
    [viewWalkThrough addGestureRecognizer:tapGesture];
}

- (void)closeWalkThrough:(UITapGestureRecognizer *)tapRecognizer {
[overlayView          removeFromSuperview];
[self.viewWalkThrough removeFromSuperview];

}

- (void)displayOverlay:(UIView *)subView aboveView:(UIView *)superView {
subView.translatesAutoresizingMaskIntoConstraints = NO;

[superView addSubview:subView];
[superView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[subView]|" options:kNilOptions metrics:nil views:NSDictionaryOfVariableBindings(subView)]];
[superView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[subView]|" options:kNilOptions metrics:nil views:NSDictionaryOfVariableBindings(subView)]];

[superView layoutSubviews];

}