OC2_点语法(属性关键字)

//
//  Dog.h
//  OC2_点语法(属性关键字)
//
//  Created by zhangxueming on 15/6/16.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//
 
#import <Foundation/Foundation.h>
 
@interface Dog : NSObject
//属性关键字
//assgin(缺省)直接赋值 //基本类型 代理对象指针
 
//retain 先release 再 retain //除了基本类型 字符串类型 代理对象, 剩下的通常用 retain
 
//copy   先release 再 copy  //字符串对象用copy
 
//atomic(缺省),nonatomic
//原子性的      非原子性的
 
//readwrite(缺省) 展开对应的setter getter方法
//readonly 只展开对应的getter方法
 
//setter getter  修改setter getter方法的方法名
//点语法访问不受影响
//经典访问要使用新的方法名
 
@property (assign,atomic)NSInteger age;
 
@property (assign, nonatomic, readwrite)float weight;
 
@property (copy,nonatomic)NSString *name;
 
@property (assign,setter=setNewNumber:,getter=getNumber) NSInteger number;
 
@end

//
//  Dog.m
//  OC2_点语法(属性关键字)
//
//  Created by zhangxueming on 15/6/16.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//
 
#import "Dog.h"
 
@implementation Dog
 
@synthesize age = _age;
 
- (NSInteger)age
{
    NSLog(@"getter");
    return _age;
}
 
- (void)setAge:(NSInteger)age
{
    NSLog(@"setter");
    _age = age;
}
 
@end

//
//  main.m
//  OC2_点语法(属性关键字)
//
//  Created by zhangxueming on 15/6/16.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//
 
#import <Foundation/Foundation.h>
#import "Dog.h"
 
int main(int argc, const char * argv[]) {
    @autoreleasepool {
        Dog *dog = [[Dog alloc] init];
        dog.name= @"小白";
        dog.age = ;
        dog.weight = 34.5;
        NSLog(@"name = %@ age = %li weight = %.2f", dog.name, dog.age, dog.weight);
 
        dog.number = ;
        NSLog(@"number = %li", dog.number);
 
        [dog setNewNumber:];
        NSLog(@"number = %li", [dog getNumber]);
 
    }
    return ;
}