CODEWITHSUNDEEP
swiftcloudkitckrecord
malena
malena

Reputation: 948

CKRecord setValue:forKey or setObject:forKey

The CKRecord class specification in Swift says to use setObject:forKey: to set the value of a CKRecord. But I am seeing a lot of code examples with setValue:forKey: which is part of NSValueCoding protocol. So can someone explain what is the advantage of one over the other?

Upvotes: 1

Views: 544

Answers (1)

vadian
vadian

Reputation: 285072

Unfortunately setValue: is very often misused.

Easy Rule:

The designated method to set an object for a key in a key/value collection type is setObject: or key subscription.

setValue: is a key-value-coding method with a special meaning. For example you can set the same property of all dictionaries (or custom objects) in an array simultaneously with a single line. setValue: can also be used to set a property in a custom class by literal key rather than using the appropriate setter.

For example the syntax

object.name = "foo"

and 

object.setValue("foo", forKey:"name")

does basically the same.

One of the exceptions to use setValue: is NSManagedObject because this class relies heavily on key-value-coding.

Edit:

Summary (literal quotation of rmaddy's excellent comment, thanks):

Only use setValue:forKey: when you have a clear, specific need to use key-value coding.

Upvotes: 3

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