ARC是cocoa系统帮你完成对象内存释放的引用计数机制
.h文件
1 // Person.h 2 // 01-ARC 3 // 4 // Created by ma c on 15/8/13. 5 // Copyright (c) 2015年. All rights reserved. 6 // 7 8 #import <Foundation/Foundation.h> 9 10 @interface Person : NSObject 11 @property(nonatomic,strong)NSString *name; 12 @property(nonatomic,assign)NSInteger age; 13 +(Person*)personWithName:(NSString*) name andAge:(NSInteger) age; 14 -(id)initWithName:(NSString*) name andAge:(NSInteger) age; 15 -(void)show; 16 @end
.m文件
1 // Person.m 2 // 01-ARC 3 // 4 // Created by ma c on 15/8/13. 5 // Copyright (c) 2015年. All rights reserved. 6 // 7 8 #import "Person.h" 9 10 @implementation Person 11 -(id)initWithName:(NSString*) name andAge:(NSInteger) age 12 { 13 self = [super init]; 14 if(self) 15 { 16 _name = name; 17 _age = age; 18 } 19 return self; 20 } 21 22 /* 23 在类方法中，由于没有创建对象实例，所以：self指针不能用，实例变量不能用。 24 */ 25 +(Person*)personWithName:(NSString*) name andAge:(NSInteger) age 26 { 27 return [[Person alloc]initWithName:name andAge:age]; 28 } 29 30 -(void)show 31 { 32 NSLog(@"name:%@,age:%ld",_name,_age); 33 } 34 35 /* 36 创建对象时是先创建父类的部分,再创建子类的部分； 37 销毁对象时，顺序正好相反 38 ARC禁止显式的发送dealloc消息 39 */ 40 -(void)dealloc 41 { 42 NSLog(@"person dealloc"); 43 //[super dealloc]; //禁止显式的发送dealloc消息 44 } 45 @end
主函数测试
1 // main.m 2 // 01-ARC 3 // 4 // Created by ma c on 15/8/13. 5 // Copyright (c) 2015年. All rights reserved. 6 // 7 8 #import <Foundation/Foundation.h> 9 #import "Person.h" 10 int main(int argc, const char * argv[]) 11 { 12 @autoreleasepool 13 { 14 Person *person = [[Person alloc]initWithName:@"Jim" andAge:22]; 15 16 [person show]; 17 //[person dealloc];//error,底层会自动调用该方法用来销毁对象 18 } 19 return 0; 20 }
测试结果：
2015-08-13 17:48:54.904 01-ARC[1636:107161] name:Jim,age:22 2015-08-13 17:48:54.905 01-ARC[1636:107161] person dealloc Program ended with exit code: 0
