做外贸需要网站吗/bt蚂蚁

@property参数

/*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)*/@interface Person : NSObject// 返回BOOL类型的方法名一般以is开头
@property (getter = isRich) BOOL rich;//   
@property (nonatomic, assign, readwrite) int weight;
// setWeight:
// weight// 
@property (readwrite, assign) int height;@property (nonatomic, assign) int age;@property (retain) NSString *name;
@end

@implementation Person@end

Book类

@interface Book : NSObject@end

@implementation Book@end

Student类

#import "Book.h"@interface Student : NSObject@property (retain) Book *book;@property (retain) NSString *name;@end

@implementation Student- (void)dealloc
{[_book release];[_name release];[super dealloc];
}@end

int main()
{Book *b = [[Book alloc] init];Person *p = [[Person alloc] init];p.book = b;NSLog(@"%ld", [b retainCount]);[p release];[b release];return 0;
}