Transparent GPUImageView?

问题

I am using a GPUImageView inside my iOS application. I want that the GPUImageView have a transparent background. I tried setBackground:[UIColor clearColor] It does not work. Any workarounds?

Regards

回答1:

I found you need to set both of these to get a transparent background. Neither works alone.

strengthPreviewImageView.backgroundColor = [UIColor clearColor];
[strengthPreviewImageView setBackgroundColorRed:0 green:0 blue:0 alpha:0];

回答2:

...Did you try the method from the GPUImageView header?

- (void)setBackgroundColorRed:(GLfloat)redComponent green:(GLfloat)greenComponent blue:(GLfloat)blueComponent alpha:(GLfloat)alphaComponent;

来源：https://stackoverflow.com/questions/13814772/transparent-gpuimageview