OC2_点语法(属性关键字)

时间:2024-04-11 18:05:47
//
// 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 ;
}