How to use Class object in Objective C code

Question

I have four screens that are exactly the same except they use four different classes. I thought I could reduce them to one by putting this property in my header:

@property Class *classType;

Then I could set the class and be done.

HOWEVER, when I try to use classType like the following:

NSArray *myArray = [classType allobjects];

I get the following: "Bad receiver type __unsafe_unretained Class *"

This really doesn't make much sense. The class method returns and NSArray. When I use the explicit class name there is no error and everything works fine.

I'm using xcode 4.5 with ARC.

Your should inherit base class or use protocol for it.

NeverBe
– NeverBe

2012-10-06 21:59:51 +00:00
Commented Oct 6, 2012 at 21:59 — NeverBe
– NeverBe, Commented Oct 6, 2012 at 21:59

Alfonso · Accepted Answer · 2012-10-06 21:58:13Z

4

Try using

@property Class classType;

Note the missing *. Class is like id, the pointer type is implied.

answered Oct 6, 2012 at 21:58

Alfonso

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2 Comments

Lloyd Sargent Over a year ago

Okay, that fixed one side of it. Now when in my main class I have controller.classType = MyOtherClass; it tosses me the error "Unexpected interface name MyOtherClass: expected expression". BTW thanks for the catch on the "*" totally overlooked that.

Lloyd Sargent Over a year ago

Perfect. I've been writing objc for almost 15 years and this is the first time I've really needed to do this. lol - thanks for the help!

user529758 · Accepted Answer · 2012-10-06 22:22:09Z

0

Quick search on Google, even better in the runtime's headers:

typedef struct objc_class *Class;

The Class type is a pointer itself - you don't need an extra * sign when declaring the property.

answered Oct 6, 2012 at 22:22

user529758

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