Objective-c series-@ Property & amp; point syntax, objective-c

Objective-c series-@ Property & point syntax, objective-c

// Explain the meanings of modifiers in parentheses behind the property:

// Nonatomic non-thread-safe non-atomic operations features: high efficiency of operation variables

// Atomic thread-safe atomic operations features: low efficiency of operation variables

//

// Retain strongly references instance variables, that is, the setter method contains:

//-(Void) setXXX :( xxx) arg

//{

// [_ Attribute name release];

// _ Attribute name = [arg retain];

//}

// And the dealloc method needs to be rewritten for this class

// All other class objects with non-oc strings must use retain

//

// Copy, that is, the setter method contains:

//-(Void) setXXX :( xxx) arg

//{

// [_ Attribute name release];

// _ Attribute name = [arg copy];

//}

// And the dealloc method needs to be rewritten for this class

// Copy applies to: oc string, block

//

// Assign is assigned directly, that is, the setter method contains:

//-(Void) setXXX :( xxx) arg

//{

// _ Attribute name = arg;

//}

// Applicable to all non-object data types: int float, char, struct

// Union, void *, SEL, class bool Enumeration

// Readonly does not provide the setter method externally, so the instance variables cannot be modified externally.

**************************************** ********

// Point syntax

@ Class Person;

Person * person = [[Person alloc] init];

Person. name = @ "Haiyan"; // setter Method

NSString * love = person. name; // getter Method

End