GPUImagePicture与GPUImageView目标？

Question

我正在尝试将GPUImagePicture的输出发送到GPUImageView，

这或多或少是我的代码：

GPUImageView *backgroundImageView = [[GPUImageView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
UIImage *image = [UIImage imageNamed:@"photo"]; //The image is not nil
GPUImagePicture *imageInput = [[GPUImagePicture alloc] initWithImage:image];

[imageInput addTarget:backgroundImageView];
[self.view addSubview:backgroundImageView];

问题是backgroundImageView似乎没有呈现图像......可能会发生什么？

Answer 1

设置过滤器（或显示）链后，需要

[imageInput processImage];

将图像传播到过滤器链下并使其显示。