Описание тега declared-property

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In Objective-C, declared properties are a convenient way to replace the declaration and manual implementation of accessor methods for objects.

A property declaration begins with the keyword @property. You can decorate a property with attributes by using the form @property(attribute [, attribute2, ...]).

You use the @synthesize directive to tell the compiler that it should synthesize the setter and/or getter methods for a property if you do not supply them within the @implementation block. The @synthesize directive also synthesizes an appropriate instance variable if it is not otherwise declared.

Declared properties provide a useful simplification of the usual requirement to explicitly declare all accessor methods, in the following ways (excerpt from Apple documentation on Declared Properties):

The property declaration provides a clear, explicit specification of how the accessor methods behave.

The compiler can synthesize accessor methods for you, according to the specification you provide in the declaration.

Properties are represented syntactically as identifiers and are scoped, so the compiler can detect use of undeclared properties.

Questions relating to the proper use of @property declarations, @synthesize, and the use of dot notation to assign values to these properties (object.propertyName = propertyValue;) should use this tag.