On Intelli j you simply write
Integer num=1;
num.
with a dot after the variable, then it shows a list of all method for the object num.
How to get the same feature on xcode?
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Xcode has autocomplete for both Swift and Objective-C. In your example with an Int, only Swift will have autocompletion, because Int is a class in Swift, but a C primitive type in Objective-C. So try autocompletion with a variable you know to be an object, not a primitive.
If it still doesn't work for you, you may want to remove your Derived Data folder, do a clean build, and restart Xcode.
TotoroTotoro
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I'm using objective c and nothing appears – user3290180 Apr 04 '17 at 16:01
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The integer is just an example because there aren't common classes between languages, just think about NSNumber or any other class object of the framework. – user3290180 Apr 04 '17 at 21:50