How to convert PHAsset to UIImage in Objective-C

Question

I have an array filled with PHAsset objects (https://developer.apple.com/library/prerelease/ios/documentation/Photos/Reference/PHAsset_Class/index.html), and I want

Answer 1

image may be nil(seldom). It's better to evaluate, otherwise array add nil will crash app.

if(image){
    ima = image;
    [images addObject:ima];
}