1.property功能用法

   1:  // @property：可以自动生成某个成员变量的setter和getter声明

   2:  @property int age;//可以直接免去变量的声明

   3:  //- (void)setAge:(int)age;

   4:  //- (int)age;

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2.注意点

若使用了property但自己写了get或set方法，自己写的会把系统的对应方法覆盖掉。

   1:  - (void)setAge:(int)age

   2:  {

   3:   

   4:  }

   5:   

   6:  //- (int)age

   7:  //{

   8:  //    

   9:  //}

  10:   

  11:  //- (int)age

  12:  //{

  13:  //    return 10;

  14:  //}

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 1.set方法内存管理相关的参数

 * retain : release旧值，retain新值（适用于OC对象类型）

 * assign : 直接赋值（默认，适用于非OC对象类型）

 * copy   : release旧值，copy新值

 2.是否要生成set方法

 * readwrite : 同时生成setter和getter的声明、实现(默认)

 * readonly  : 只会生成getter的声明、实现

 3.多线程管理

 * nonatomic : 性能高 (一般就用这个)

 * atomic    : 性能低（默认）

 4.setter和getter方法的名称

 * setter : 决定了set方法的名称，一定要有个冒号 :

 * getter : 决定了get方法的名称(一般用在BOOL类型)

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