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For example I have
NSString *string = @"return sharedInstance;";
I have a class method
+ (id)sharedInstance;
Can I convert that string to plain code and use it in my method? This would be extremely useful for debugging. Suppose I have a method where I want to test some code (Let it be simple return values, Is it possible?) I can just write code for the method and test the new code in runtime.
669
(NSString *) is simply the type of the argument - a string object, which is the NSString class in Cocoa. In Objective-C you're always dealing with object references (pointers), so the "*" indicates that the argument is a reference to an NSString object.
An NSString object can be initialized from or written to a C buffer, an NSData object, or the contents of an NSURL . It can also be encoded and decoded to and from ASCII, UTF–8, UTF–16, UTF–32, or any other string encoding represented by NSStringEncoding .
NSString : Creates objects that resides in heap and always passed by reference. String: Its a value type whenever we pass it , its passed by value. like Struct and Enum, String itself a Struct in Swift.
Objective C on iOS is a compiled language; The code is interpreted and translated to machine code long before you run your application. Running objective C in a dynamic manner like this is not possible. For this you're gonna need a dynamic language.
99
What you've described isn't exactly possible. But there is support for certain things, eg, the ability to instantiate classes and invoke methods (theoretically) with strings:
NSClassFromString allows you to instantiate classes based on a passed string.
NSSelectorFromString allows you to invoke or 'call' a method based on passed string.
The string can be determined dynamically at run-time.
Based on your comments this is apparently not what you're interested in (despite the fact I think it does actually address your question). One thing you can do (it's not native Obj-C, but I think it is pertinent given some of the comments) is to inject JavaScript into a UIWebView.
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