花了一些时间并不能真正理解哪里出了问题。我正在使用GPUImage0.1.3(来自CocoaPods)并且代码非常简单:GPUImageiOSBlurFilter*iosBlur=[[GPUImageiOSBlurFilteralloc]init];UIImage*splashScreenImage=[UIImageimageNamed:@"Splash"];UIImage*bluredImage=[iosBlurimageByFilteringImage:splashScreenImage];bluredImage为零。我单步执行了代码，iosBlur不是nil，splashScre