iOS 多线程实例（NSThread售票窗口的模拟）

来源：互联网发布：java 自定义构造函数编辑：程序博客网时间：2024/06/05 02:19

主要的知识点：

初始化：NSThread *thirdtWindow = [[NSThread alloc]initWithTarget:selfselector:@selector(saleTicket) object:nil];

thirdtWindow.name = @"售票窗口";

[thirdtWindow start];

NSCondition *condition = [[NSCondition alloc]init];

上锁：[condition lock];

解锁：[condition unlock];

#import "ViewController.h"

@interface ViewController ()

{

UILabel *showLabel;

int curTicketNum;

int saleTicketNum;

NSString *saleWindowName;

NSCondition *condition;

}

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

// 卖票系统分三个窗口同时销售

curTicketNum = 100;

UIButton *button = [UIButton buttonWithType:0];

button.frame = CGRectMake(100, 20, 150, 30);

[button setTitle:@"开始卖票" forState:UIControlStateNormal];

button.backgroundColor = [UIColor blackColor];

[button addTarget:self action:@selector(startSale) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:button];

showLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 200, CGRectGetWidth(self.view.frame), CGRectGetWidth(self.view.frame))];

showLabel.backgroundColor = [UIColor whiteColor];

showLabel.text = @"剩余100张票";

showLabel.numberOfLines = 3;

showLabel.textAlignment = NSTextAlignmentCenter;

[self.view addSubview:showLabel];

}

//三个窗口同时卖票

- (void)startSale

{

//初始化三个线程每一个线程是一个售票窗口

NSThread *firstWindow = [[NSThread alloc]initWithTarget:self selector:@selector(saleTicket) object:nil];

firstWindow.name = @"售票窗口1";

[firstWindow start];

NSThread *twoWindow = [[NSThread alloc]initWithTarget:self selector:@selector(saleTicket) object:nil];

twoWindow.name = @"售票窗口2";

[twoWindow start];

NSThread *thirdtWindow = [[NSThread alloc]initWithTarget:self selector:@selector(saleTicket) object:nil];

thirdtWindow.name = @"售票窗口3";

[thirdtWindow start];

condition = [[NSCondition alloc]init];

}

- (void)saleTicket

{

while (curTicketNum > 0) {

[NSThread sleepForTimeInterval:0.3];

[condition lock];

// 当前票数

curTicketNum -= 1;

// 卖得票数

saleTicketNum = 100 - curTicketNum;

saleWindowName = [NSThread currentThread].name;

if (curTicketNum > 0) {

[condition unlock];

}

[self performSelectorOnMainThread:@selector(updateUI) withObject:nil waitUntilDone:YES];

}

- (void)updateUI

{

NSLog(@"已经销售%d张票\n还剩%d张票",saleTicketNum,curTicketNum);

showLabel.text = [NSString stringWithFormat:@"%@\n已经销售%d张票\n还剩%d张票",saleWindowName,saleTicketNum,curTicketNum];

}

@end

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