create one UIImage from two UIImageView

Question

I have two UIImageView on the UIView. Each UIImageView have one UIImage. Now i want create an one UIImage from two UIImageView.

Please give the suggestion how can i do this.

i'm not sure about what you are actually trying to implement. Is the resulting image is superimposed one of the 2 images or some other one.. — Nithin
– Nithin, Commented Jan 5, 2010 at 10:49

Niels Castle · Accepted Answer · 2010-01-05 12:54:58Z

11

If your have a view with three UIImageViews and create corresponding outlets

IBOutlet UIImageView *imageView1;
IBOutlet UIImageView *imageView2;
IBOutlet UIImageView *imageView3;

You can do something like the following to combine imageViews 1 and 2 into imageView 3

UIGraphicsBeginImageContext(imageView1.image.size);  

CGRect rect = CGRectMake(0, 0, imageView1.image.size.width, imageView1.image.size.height);

[imageView1.image drawInRect:rect];  
[imageView2.image drawInRect:rect blendMode:kCGBlendModeScreen alpha:0.5];  

UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();  
UIGraphicsEndImageContext();  

[imageView3 setImage:resultingImage];

CGBlendMode allows you to choose from any of the following compositing operations for your images:

enum CGBlendMode {
   kCGBlendModeNormal,
   kCGBlendModeMultiply,
   kCGBlendModeScreen,
   kCGBlendModeOverlay,
   kCGBlendModeDarken,
   kCGBlendModeLighten,
   kCGBlendModeColorDodge,
   kCGBlendModeColorBurn,
   kCGBlendModeSoftLight,
   kCGBlendModeHardLight,
   kCGBlendModeDifference,
   kCGBlendModeExclusion,
   kCGBlendModeHue,
   kCGBlendModeSaturation,
   kCGBlendModeColor,
   kCGBlendModeLuminosity,
   kCGBlendModeClear,
   kCGBlendModeCopy,
   kCGBlendModeSourceIn,
   kCGBlendModeSourceOut,
   kCGBlendModeSourceAtop,
   kCGBlendModeDestinationOver,
   kCGBlendModeDestinationIn,
   kCGBlendModeDestinationOut,
   kCGBlendModeDestinationAtop,
   kCGBlendModeXOR,
   kCGBlendModePlusDarker,
   kCGBlendModePlusLighter
};

edited Jan 5, 2010 at 12:54

answered Jan 5, 2010 at 12:48

Niels Castle

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1 Comment

iOSAppDev Over a year ago

Niels Castle- I need to perform same operation. My main imageview is static but my second imageview is draggable. So above code creates my second imageview same as main imageview bounds. How can I merge these two images into one without making its bound same as mainimageview? Thanks.

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