IOS-multithreading (simulated train ticket Ticketing System)

 

I. Implementation results

In this program, seven controls, three descriptive labels, three output ports, and one button are used.

Ii. Code attributes

Attributes used: Three output labels and one button

One button Method

 

# Import

 

@ Interface WeSecondThreadViewController: UIViewController

{// Remaining votes and sold votes

Int _ leftTicks;

Int _ saledTicks;

// Two threads

NSThread * _ firstThread;

NSThread * _ secondThread;

// Lock Condition

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

Iii. method implementation

// Initialize the remaining number of votes and number of sold votes

-(Void) viewDidLoad

{

[Super viewDidLoad];

_ LeftTicks = 100;

_ SaledTicks = 0;

_ TicksConfition = [[NSCondition alloc] init];

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

}

// Response method of the button

-(IBAction) startAction :( id) sender

{

// Start with a thread

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

[_ FirstThread setName: @ Thread_1];

[_ FirstThread start];

// Start with thread 2

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

[_ SecondThread setName: @ Thread_2];

[_ SecondThread start];

}

-(Void) startThread :( id) sender

{

While (TRUE)

{

// Thread lock to enable interaction between two threads

[_ TicksConfition lock];

If (_ leftTicks> 0)

{

[NSThread sleepForTimeInterval: 0.1];

_ LeftTicks --;

_ SaledTicks = 100-_ leftTicks;

NSString * pstr = [[NSThread currentThread] name];

NSLog (@ sold votes: % I remaining votes % I current thread % @, _ saledTicks, _ leftTicks, pstr );

}

Else if (_ leftTicks = 0)

{

NSLog (@ ticket sold out );

Break;

}

// Update in the main thread

[Self initialize mselecw.mainthread: @ selector (updateMyView :) withObject: [[NSThread currentThread] name] waitUntilDone: YES];

// Unlock

[_ TicksConfition unlock];

}

}

// Update on the screen

-(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: @ notification message: @ delegate: nil cancelButtonTitle: nil otherButtonTitles: @ OK, nil];

[PAlter show];

[PAlter release];

}

 

}

Demo related: http://download.csdn.net/detail/u012887301/6777319