第一部分

1 //  2 //  main.m  3 //  04-@property参数  4 //  5 //  Created by apple on 13-8-9.  6 //  Copyright (c) 2013年 itcast. All rights reserved.  7 //  8 #import 
     
        9  10 @interface Book : NSObject 11  12 @end 13 #import "Book.h" 14  15 @implementation Book 16  17 @end 18  19  20 #import 
      
        21 #import "Book.h" 22  23 @interface Person : NSObject 24 @property int age; 25  26 // retain : 生成的set方法里面，release旧值，retain新值 27 @property (retain) Book *book; 28 @property (retain) NSString *name; 29  30 @end 31  32 #import "Person.h" 33  34 @implementation Person 35  36 //- (void)setBook:(Book *)book 37 //{ 38 //    if (_book != book) 39 //    { 40 //        [_book release]; 41 // 42 //        _book = [book retain]; 43 //    } 44 //} 45  46 - (void)dealloc 47 { 48     [_book release]; 49     [_name release]; 50     [super dealloc]; 51 } 52  53 @end 54  55  56  57  58 #import 
       
         59 #import "Book.h" 60  61 @interface Student : NSObject 62  63 @property (retain) Book *book; 64  65 @property (retain) NSString *name; 66  67 @end 68  69  70 #import "Student.h" 71  72 @implementation Student 73  74  75 - (void)dealloc 76 { 77     [_book release]; 78     [_name release]; 79      80     [super dealloc]; 81 } 82  83 @end 84  85  86 #import 
        
          87 #import "Person.h" 88 #import "Book.h" 89  90 int main() 91 { 92     Book *b = [[Book alloc] init]; 93     Person *p = [[Person alloc] init]; 94      95     p.book = b; 96      97      98     NSLog(@"%ld", [b retainCount]); 99     100     101     [p release];102     [b release];103     return 0;104 }
        
       
      
     

 

第二部分

 

1 // 2 //  main.m 3 //  05-@property参数 4 // 5 //  Created by apple on 13-8-9. 6 //  Copyright (c) 2013年 itcast. All rights reserved. 7 // 8  9 #import 
     
      10 11 /*12  1.set方法内存管理相关的参数13  * retain : release旧值，retain新值（适用于OC对象类型）14  * assign : 直接赋值（默认，适用于非OC对象类型）15  * copy   : release旧值，copy新值16  17  2.是否要生成set方法18  * readwrite : 同时生成setter和getter的声明、实现(默认)19  * readonly  : 只会生成getter的声明、实现20  21  3.多线程管理22  * nonatomic : 性能高 (一般就用这个)23  * atomic    : 性能低（默认）24  25  4.setter和getter方法的名称26  * setter : 决定了set方法的名称，一定要有个冒号 :27  * getter : 决定了get方法的名称(一般用在BOOL类型)28  */29 30 @interface Person : NSObject31 32 33 // 返回BOOL类型的方法名一般以is开头34 @property (getter = isRich) BOOL rich;35 36 //37 @property (nonatomic, assign, readwrite) int weight;38 // setWeight:39 // weight40 41 //42 @property (readwrite, assign) int height;43 44 @property (nonatomic, assign) int age;45 46 @property (retain) NSString *name;47 @end48 49 #import "Person.h"50 51 @implementation Person52 53 @end54 55 56 57 58 59 #import 
      
       60 #import "Person.h"61 62 int main()63 {64     Person *p = [[Person alloc] init];65     66     67     p.rich = YES;68     69     BOOL b = p.isRich;70     71     return 0;72 }