Objective-C - readonly properties not synthesized with underscore ivar?

Question

If I understand correctly, in Objective-C, properties are automatically synthesized with getters and setters, with the instance variable declared as the property name with a

Answer 1

A property is not automatically synthesized if you implement all required accessor methods (getter for a read-only property, getter + setter for a read-write property).

Because you implement the getter method -(NSString *)myString for the read-only property, it is not auto-synthesized. If your getter needs an instance variable to backup the property value, you have to add the synthesize statement (as you did) or an instance variable.