iOS－多线程（模拟火车票售票系统）

关于线程的介绍见上一片博文，iOS单线程：http://blog.csdn.net/yakerwei/article/details/17589709

一、实现结果

在本程序中，用到7个控件，三个说明性label，三个输出口label，一个button。



二、代码的属性部分

用到的属性：3个输出label，一个按钮

一个按钮方法

#import <UIKit/UIKit.h>

@interface WeSecondThreadViewController :
UIViewController

{   //剩余票数和售出票数
   
int _leftTicks;
   
int _saledTicks;

    //两个线程
   
NSThread *_firstThread;
   
NSThread *_secondThread;

    //lock条件
   
NSCondition *_ticksConfition;
}

@property (retain,
nonatomic) IBOutlet
UILabel *leftTicksLabel;

@property (retain,
nonatomic) IBOutlet
UILabel *saledTicksLabel;

@property (retain,
nonatomic) IBOutlet
UILabel *currentThreadLabel;

@property (retain,
nonatomic) IBOutlet
UIButton *startBtn;
- (IBAction)startAction:(id)sender;

@end
三、方法实现部分

//剩余票数和售出票数初始化
- (void)viewDidLoad
{

    [super
viewDidLoad];

    _leftTicks =
100;

    _saledTicks =
0;

    _ticksConfition = [[NSCondition
alloc]init];

    // Do any additional setup after loading the view from its nib.
}

//按钮的响应方法
- (IBAction)startAction:(id)sender
{

    //线程一开始

    _firstThread = [[NSThread
alloc]initWithTarget:self
selector:@selector(startThread:)
object:nil];

    [_firstThread
setName:@"Thread_1"];

    [_firstThread
start];

    //线程二开始

    _secondThread = [[NSThread
alloc]initWithTarget:self
selector:@selector(startThread:)
object:nil];

    [_secondThread
setName:@"Thread_2"];

    [_secondThread
start];
}
- (void)startThread:(id)sender
{

   while (TRUE)
   {

       //线程锁，使一二线程交互

       [_ticksConfition
lock];
      
if (_leftTicks >
0 )
       {

           [NSThread
sleepForTimeInterval:0.1];
          
_leftTicks --;

           _saledTicks =
100 -
_leftTicks;
          
NSString *pstr = [[NSThread
currentThread]name];
          
NSLog(@"售出票数:%i
剩余票数%i
当前线程%@",_saledTicks,_leftTicks,pstr);
       }
      
else if (_leftTicks ==
0)
       {
          
NSLog(@"票已售完");
          
break;
       }

       //在主线程中更新

       [self
performSelectorOnMainThread:@selector(updateMyView:)
withObject:[[NSThread
currentThread]name]
waitUntilDone:YES];
      
//解锁

       [_ticksConfition
unlock];
   }
}

//屏幕上更新
- (void)updateMyView:(id)sender
{

   self.leftTicksLabel.text = [NSString
stringWithFormat:@"%i",_leftTicks];

   self.saledTicksLabel.text = [NSString
stringWithFormat:@"%i",_saledTicks];
  
self.currentThreadLabel.text = (NSString*)sender;

    
   
if (_leftTicks ==
0)
    {

        UIAlertView *pAlter = [[UIAlertView
alloc]initWithTitle:@"通知"
message:@"今日票已售完" delegate:nil
cancelButtonTitle:nil
otherButtonTitles:@"确认",
nil];
        [pAlter
show];
        [pAlter
release];
    }

}

相关demo下载地址：http://download.csdn.net/detail/u012887301/6777319