OC内存管理Demo-创新互联

//主函数

#import

#import "Car.h"

int main(int argc, const char * argv[]) {

  Lamp *lamp = [[Lamp alloc] init];                   //初始化车灯对象

  lamp.wattage = 75;

  Engine *engine = [[Engine alloc] initWithModel:@"MX-8" Capacity:180]; //初始化引擎对象

  Car *benz = [[Car alloc] initWithName:@"奔驰" Licence:@"京A:DB250"]; //初始化汽车对象

  benz.engine = engine;

  [engine release];      //将engine对象赋给benz后，引用计数-1，还剩1

  benz.lamp = lamp;

  [lamp release];       //将lamp对象赋给benz后，引用计数-1，还剩1

  [benz run];                 //调用run方法

  //为上述方法设置定时器

//  [NSTimer scheduledTimerWithTimeInterval:1

//                   target:benz

//                  selector:@selector(run)

//                  userInfo:nil

//                  repeats:YES];

//  NSLog(@"-------------分割线--------------");

  [benz stop];                //调用stop方法

  //为上述方法设置定时器

//  [NSTimer scheduledTimerWithTimeInterval:1

//                   target:benz

//                  selector:@selector(stop)

//                  userInfo:nil

//                  repeats:YES];

//  NSLog(@"-------------分割线--------------");

  [benz release];//benz对象使用完毕，释放内存，此时benz、engine、lamp引用计数全部为0，系统自动调用dealloc方法销毁内存

  //RunLoop10秒后停止

//  [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:10]];

  return 0;

}

Car类：

//car.h

#import

#import "Engine.h"

#import "Lamp.h"

@interface Car : NSObject

{

  NSString *_name;    //名字

  NSString *_licence;   //车牌号

  Engine *_engine;    //引擎对象

  Lamp *_lamp;      //车灯对象

}

//对4个实例变量使用@property生成set和get方法

@property (nonatomic, copy) NSString *name;

@property (nonatomic, copy) NSString *licence;

@property (nonatomic, retain)Engine *engine;

@property (nonatomic, retain)Lamp *lamp;

//自定义初始化方法

- (id)initWithName:(NSString *)name Licence:(NSString *)licence;

//启动 方法

- (void)run;

//停止 方法

- (void)stop;

- (void)dealloc;

@end

//Car.m

#import "Car.h"

@implementation Car

- (id)initWithName:(NSString *)name Licence:(NSString *)licence

{

  self = [super init];

  if (self) {

    _name = name;

    _licence = licence;

  }

  return self;

}

- (void)run

{

  NSLog(@"车牌号为：%@的%@车 启动了", _licence, _name);

  [_lamp light];

  [_engine turn];

  NSLog(@"-------------分割线--------------");

}

- (void)stop

{

  [_lamp dark];

  [_engine stopTurn];

  NSLog(@"车牌号为：%@的%@车 停止了", _licence, _name);

  NSLog(@"-------------分割线--------------");

}

- (void)dealloc

{

  [_lamp release];

  _lamp = nil;

  [_engine release];

  _engine = nil;

  NSLog(@"车牌号为：%@的%@车 卒！", _licence, _name);

  [super dealloc];

  self = nil;

}

@end

Engine类：

//Engine.h

#import

@interface Engine : NSObject

{

  NSString *_model;    //型号

  NSInteger _capacity;  //排量

}

@property (nonatomic, copy) NSString *model;

@property (nonatomic, assign) NSInteger capacity;

//自定义初始化方法

- (id)initWithModel:(NSString *)model Capacity:(NSInteger)capacity;

//转动 方法

- (void)turn;

//停止转动 方法

- (void)stopTurn;

- (void)dealloc;

@end

//Engine.m

#import "Engine.h"

@implementation Engine

- (id)initWithModel:(NSString *)model Capacity:(NSInteger)capacity

{

  self = [super init];

  if (self) {

    _model = model;

    _capacity = capacity;

  }

  return self;

}

- (void)turn

{

  NSLog(@"型号为%@，排量为%ld的引擎 转动了", _model, _capacity);

}

- (void)stopTurn

{

  NSLog(@"型号为%@，排量为%ld的引擎 停止转动了", _model, _capacity);

}

- (void)dealloc

{

  NSLog(@"型号为%@，排量为%ld的引擎 卒！", _model, _capacity);

  [super dealloc];

}

@end

Lamp类：

//Lamp.h

#import

@interface Lamp : NSObject

{

  int _wattage;

}

@property (nonatomic, assign) int wattage;

//灯亮 方法

- (void)light;

//灯灭 方法

- (void)dark;

- (void)dealloc;

@end

//Lamp.m

#import "Lamp.h"

@implementation Lamp

//灯亮 方法

- (void)light

{

  NSLog(@"瓦数为%d的灯亮了", _wattage);

}

//灯灭 方法

- (void)dark

{

  NSLog(@"瓦数为%d的灯灭了", _wattage);

}

- (void)dealloc

{

  NSLog(@"瓦数为%d的灯 卒！", _wattage);

  [super dealloc];

}

@end

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