通過實例講解：

 

@interface DemoObject : NSObject

@property (strong, nonatomic,readonly) NSString *name;
@property (strong, nonatomic) NSMutableArray *dataSource;
@property (copy, nonatomic) NSDictionary *product;
@property (assign, atomic) NSUInteger count;
@property (weak, nonatomic) DemoObject *object;

@end

    unsigned int count;
    objc_property_t *properties = class_copyPropertyList([DemoObject class], &count);
    for(int i = 0; i < count; i++)
    {
        objc_property_t property = properties[i];
        
        NSLog(@"name:%s",property_getName(property));
        NSLog(@"attributes:%s",property_getAttributes(property));

    }
    free(properties);

打印信息如下：

 

2015-04-28 14:59:16.421 AppTest[11137:94568] name:name
2015-04-28 14:59:16.422 AppTest[11137:94568] attributes:T@"NSString",R,N,V_name
2015-04-28 14:59:16.422 AppTest[11137:94568] name:dataSource
2015-04-28 14:59:16.422 AppTest[11137:94568] attributes:T@"NSMutableArray",&,N,V_dataSource
2015-04-28 14:59:16.422 AppTest[11137:94568] name:product
2015-04-28 14:59:16.422 AppTest[11137:94568] attributes:T@"NSDictionary",C,N,V_product
2015-04-28 14:59:16.422 AppTest[11137:94568] name:count
2015-04-28 14:59:16.422 AppTest[11137:94568] attributes:TQ,V_count
2015-04-28 14:59:16.422 AppTest[11137:94568] name:object
2015-04-28 14:59:16.422 AppTest[11137:94568] attributes:T@"DemoObject",W,N,V_object

 

說明：

如果我們要獲取字符串，要通過UTF8編碼獲取，如下所示：

 

NSString *name = [NSString stringWithUTF8String:property_getName(property)];
NSString *attributes = [NSString stringWithUTF8String:property_getAttributes(property)];

 

屬性的特性是固定格式，以逗號隔開，通常是T@"類型"開頭,V_屬性名稱結尾的格式，中間的見下表描述：

You can use the property_getAttributes function to discover the name, the @encode type string of a property, and other attributes of the property.

The string starts with a T followed by the @encode type and a comma, and finishes with a V followed by the name of the backing instance variable. Between these, the attributes are specified by the following descriptors, separated by commas:

 

還有一些其他類型的屬性實例，可以搜索蘋果文檔“Property Attribute Description Examples”

 

用途：

1.我們在發送網絡請求的時候，收到服務器回復的數據模型以後，不需要在每個數據模型裡面去解析json字典為我們的模型類，我們可以通過一個基類來實現這個功能，所有的模型都繼承這個基類就OK了，這個功能就可以簡單地通過屬性列表來獲取屬性名稱，屬性類型（屬性類型對應json模型的鍵）然後賦值就可以了。

2.自定義類的序列化和反序列化。