无法将UIImageView放入SKScene的视图中

我需要显示gif图像,我已尝试 SKSpriteNote 但它不支持gif。所以我想用 UIImageView 相反

在MyScene.m init方法中:

#import "UIImage+animatedGIF.h"

CGSize size = CGSizeMake(144, 82);

//create a uiview on top of skview
self.demoView = [[UIImageView alloc] initWithFrame:CGRectMake(self.view.bounds.size.width / 2 - size.width / 2, self.view.bounds.size.height / 2 - size.height / 2, size.width, size.height)];

[self.view addSubview:self.demoView];

//set the image to be the gif (I use a category from github)
self.demoView.image = [UIImage animatedImageWithAnimatedGIFURL:[NSURL URLWithString:[Helper pathInBundleWithFileName:[self demoFileNameWithStep:step]]]];
[self.demoView startAnimating];

这与gif图像无关,因为即使我尝试静态png图像,也不会显示图像视图。

我也尝试过,但也不起作用:

    [self.view.superview addSubview:self.demoView];
    [self.view.superview bringSubviewToFront:self.demoView];