What is the difference between readonly and readwrite in Objective C?

Question

Can any one tell me the difference between readonly and readwrite properties in the iPhone SDK?

Answer 1

readwrite Indicates that the property should be treated as read/write. This attribute is the default. Both a getter and setter method are required in the @implementation block. If you use the @synthesize directive in the implementation block, the getter and setter methods are synthesized.

readonly Indicates that the property is read-only. If you specify readonly, only a getter method is required in the @implementation block. If you use the @synthesize directive in the @implementation block, only the getter method is synthesized. Moreover, if you attempt to assign a value using the dot syntax, you get a compiler error.

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