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  • 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 = 12;
            dog.weight = 34.5;
            NSLog(@"name = %@ age = %li weight = %.2f", dog.name, dog.age, dog.weight);
            
            dog.number = 100;
            NSLog(@"number = %li", dog.number);
            
            [dog setNewNumber:200];
            NSLog(@"number = %li", [dog getNumber]);
            
            
            
            
        }
        return 0;
    }
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  • 原文地址:https://www.cnblogs.com/0515offer/p/4581198.html
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