title: method "setImage:" not find on GPUImageView
body: <p>I'll set an image on a GPUImageView. </p>
  
  <pre><code>UIImage *adjustedImage = [lookupFilter imageFromCurrentFramebufferWithOrientation:0];
  [self-&gt;_imgView setImage:adjustedImage];
  </code></pre>
  
  <p>But in the <code>GPUImageView</code> Class is not the <code>setImage:</code> method.
  Can someone post the whole method of <code>setImage:</code> or tell me how I can find this method?
  I thought I can copy the method from the <code>UIImageView.m</code> file and paste it in the <code>GPUImageView.m</code> file. But I can't find the <code>UIImageView.m</code> file.</p>
  
  <p><strong>GPUImageView.h</strong></p>
  
  <pre><code>#import &lt;UIKit/UIKit.h&gt;
  #import "GPUImageContext.h"
  
  typedef enum {
      kGPUImageFillModeStretch,                       // Stretch to fill the full view, which may distort the image outside of its normal aspect ratio
      kGPUImageFillModePreserveAspectRatio,           // Maintains the aspect ratio of the source image, adding bars of the specified background color
      kGPUImageFillModePreserveAspectRatioAndFill     // Maintains the aspect ratio of the source image, zooming in on its center to fill the view
  } GPUImageFillModeType; 
  
  /**
   UIView subclass to use as an endpoint for displaying GPUImage outputs
   */
  @interface GPUImageView : UIView &lt;GPUImageInput&gt;
  {
      GPUImageRotationMode inputRotation;
  }
  
  /** The fill mode dictates how images are fit in the view, with the default being kGPUImageFillModePreserveAspectRatio
   */
  @property(readwrite, nonatomic) GPUImageFillModeType fillMode;
  
  /** This calculates the current display size, in pixels, taking into account Retina scaling factors
   */
  @property(readonly, nonatomic) CGSize sizeInPixels;
  
  @property(nonatomic) BOOL enabled;
  
  /** Handling fill mode
  
   @param redComponent Red component for background color
   @param greenComponent Green component for background color
   @param blueComponent Blue component for background color
   @param alphaComponent Alpha component for background color
   */
  - (void)setBackgroundColorRed:(GLfloat)redComponent green:(GLfloat)greenComponent blue:(GLfloat)blueComponent alpha:(GLfloat)alphaComponent;
  
  - (void)setCurrentlyReceivingMonochromeInput:(BOOL)newValue;
  
  @end
  </code></pre>