NSData and UIImage


NSData and UIImage



I am trying to load UIImage object from NSData, and the sample code was to NSImage, I guess they should be the same. But just now loading the image, I am wondering what's the best to troubleshoot the UIImage loading NSData issue.




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UIImage has an -initWithData: method.


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From the docs: "The data in the data parameter must be formatted to match the file format of one of the system’s supported image types.".
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I didn't try UIImageJPEGRepresentation() before, but UIImagePNGRepresentation works fine for me, and conversion between NSData and UIImage is dead simple:.
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NSData *imageData = UIImagePNGRepresentation(image); UIImage *image=[UIImage imageWithData:imageData]; 


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Try this to convert an image to NSdata:.
UIImage *img = [UIImage imageNamed:@"image.png"]; NSData *data1 = UIImagePNGRepresentation(img); 


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theData should be a NSData object which already contains the data.

You need to do the file loading/downloading to the NSData object before it is used.

You can inspect it by using NSLog on theData and see if it contains the valid data..



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