StackOverflow2013

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14930774
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2013-02-18T06:39:59.363
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2013-02-18T06:39:59.363
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Let's say you have an array of source images: <pre><code>NSArray *sourceImages = ...; // each element of sourceImages is a UIImage </code></pre> Now you want to take the first <code>count</code> images from the array and concatenate them vertically into a new image. Start by figuring out the size of the combined image: <pre><code>CGSize combinedSize = CGSizeMake(0, 0); for (int i = 0; i < count; ++i) { CGSize sourceSize = [sourceImages[i] size]; combinedSize.width = MAX(combinedSize.width, sourceSize.width); combinedSize.height += sourceSize.height; } </code></pre> Next, create a graphics context of that size: <pre><code>UIGraphicsBeginImageContextWithOptions(combinedSize, NO, 0); { </code></pre> Now draw each component image into the graphics context at the appropriate position: <pre><code> CGFloat y = 0; for (int i = 0; i < count; ++i) { UIImage *sourceImage = sourceImages[i]; [sourceImage drawAtPoint:CGPointMake(0, y)]; y += sourceImage.size.height; } </code></pre> Finally, create the combined image from the context and dispose of the context: <pre><code>} UIImage *combinedImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); </code></pre> Read <a href="http://developer.apple.com/library/ios/documentation/2ddrawing/conceptual/drawingprintingios/HandlingImages/Images.html#//apple_ref/doc/uid/TP40010156-CH13-SW1" rel="nofollow">Drawing and Printing Guide for iOS - Drawing and Creating Images</a> for more information.
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1. PORender a single UIImage and rotation has to be applied
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1. USrob mayoff
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1. PORender a single UIImage and rotation has to be applied
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1. COThanks a lot for the info. It works .But if i touch the another image in the array, the entire image context should be redrawn .Any help ? Thanks in Advance
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 USiVenky

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