iOS development OC (vii)--@property and @synthesize

@property and @synthesize

First, from the perspective of translation: @property (translated to: Nature) and @synthesize (synthesis), is not much like attributes (declarations) and implementation?

1. @property

Used in @inteface.

declaration used to automatically generate setter and getter

with @property int age, you can replace the following two lines

-(void) Setage: (int) age;  // Setter-(int) age;   // Getter

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Used in @implementation.

implementation to automatically generate setter and getter

With @synthesize age = _age, you can replace

-(int) age{    return  _age;} -(void) Setage: (int) age{    = Age ;}

3. @synthesize Details (learn only)

• @synthesize age = _age;

The member variables are accessed in the > Setter and Getter implementations _age

> If the member variable _age does not exist, a @private member variable is automatically generated _age

• @synthesize age;

Member variables are accessed in the >setter and Getter implementations

> If the member variable age does not exist, it will automatically generate a @private member variable age

• Manual implementation

> If the setter method is implemented manually, the compiler will only automatically generate getter methods

> If the Getter method is implemented manually, the compiler will only automatically generate setter methods

> If the setter and getter methods are manually implemented at the same time, the compiler does not automatically generate non-existent member variables

4. @property new features (haha, use this now)

• Since Xcode 4.x, the @property has @synthesize functionality. In other words,@property can generate both a setter and a getter declaration and implementation

• By default, implementations in the setter and Getter methods go to the member variables that begin with the underscore _

iOS development OC (vii)[email protected] and @synthesize