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I don’t quite understand what you mean. . . Java's reflection can dynamically obtain the method and attribute list of an instance. For this function, Obj-c can use NSObject's respondsToSelector: method to confirm whether an instance has a certain method; it can also use performSelector: to call the method. . Basically it can replace Java's reflection.
As for the problem of judging empty return value, I really don’t have a good way at the moment. I usually define a method and judge containsObject:, nil, [NSNull null], length or count in sequence. This method can be written in a util or can be extended and written in NSDictionary and NSArray.

objc’s KVC mechanism is similar to java’s reflection. Please google it

For example
@interface A : NSObject{
NSString * name;
}

You can get it like this

A *a = [[A alloc] init];

NSString *name = [a objectForKey:@"name"];

I don’t know if you want this

You implement the nscoding interface. - (id)initWithCoder:(NSCoder *)aDecoder can do what you want. I don't know if I understand it correctly.

• OC has an open source framework of JSONModel, which can convert Json into ViewModel

• The problem of null value can be determined when the View layer is used or the default value can be set when the ViewModel is constructed

• Regarding reflection of OC, you can use NSClassFromString, NSSelectorFromString and other methods