can I check if downloaded image is corrupt or not before saving?

can I check if downloaded image is corrupt or not before saving it into my document director开发者_如何学运维y? if yes then please tell me how? thank you

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UIImage *im = [[UIImage alloc] initWithData:YourNSData];
UIImageView *imview;

// test to see if the image was successfully created
if (im){
   imview = [[UIImageView alloc] initWithImage:im];
}

Hope this helps

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You could try to load the NSData object in a UIIImage with the initData. Then check if the return UIImage object is nil. This is not full proof methods, but should work.