NSThread-02-多线程-四种创建方式

  1 //
  2 //  ViewController.m
  3 //  00-NSThread（四种方式）
  4 //
  5 //  Created by mac on 16/4/20.
  6 //  Copyright © 2016年 mac. All rights reserved.
  7 //
  8 #import "CustumOperation.h"
  9 #import "ViewController.h"
 10 
 11 @interface ViewController ()
 12 
 13 @end
 14 
 15 @implementation ViewController
 16 /**
 17  *  线程优先级是系统自动分配的，随机分配
 18  */
 19 
 20 - (void)viewDidLoad {
 21     [super viewDidLoad];
 22 
 23     [self createdThread1];
 24     [self createdThread2];
 25     [self createdThread3];
 26     [self createdThread4];
 27 }
 28 
 29 /**
 30  *  创建多线程方法一
 31  */
 32 - (void)createdThread1 {
 33     
 34     //1.创建多线程方法（一）NSThread
 35     NSThread *thread = [[NSThread alloc] initWithTarget:self selector:@selector(threadAction) object:nil];
 36     thread.name = @"thread1111";
 37     
 38     //启动多线程
 39     [thread start];
 40     
 41     //延迟调用cancel方法取消线程
 42     [self performSelector:@selector(cancelThread:) withObject:thread afterDelay:0.2];
 43     
 44     //打印主线程
 45     NSLog(@"%d===main:%@==%lf", [NSThread isMainThread],[NSThread currentThread], [NSThread threadPriority]);
 46 }
 47 - (void)threadAction {
 48     
 49     //3）休眠
 50     [NSThread sleepForTimeInterval:2];
 51     
 52     if ([[NSThread currentThread] isCancelled]) {
 53     
 54         NSLog(@"当前线程退出");
 55         
 56         //2）退出线程
 57         [NSThread exit];
 58     }
 59 
 60     for (int i = 0; i < 50; i ++) {
 61         
 62         NSLog(@"%@", [NSThread currentThread]);
 63     }
 64     
 65     NSLog(@"%lf,%d", [NSThread threadPriority], [NSThread isMainThread]);
 66 }
 67 - (void)cancelThread:(NSThread *)thread {
 68     
 69     //1）标记线程状态为：即将取消并非真正已经取消了
 70     [thread cancel];
 71 }
 72 
 73 /**
 74  *  创建多线程方法二
 75  */
 76 - (void)createdThread2 {
 77     
 78     [NSThread detachNewThreadSelector:@selector(threadAction) toTarget:self withObject:nil];
 79 }
 80 /**
 81  *  创建多线程方法三
 82  */
 83 - (void)createdThread3 {
 84     
 85     [self performSelectorInBackground:@selector(threadAction) withObject:nil];
 86 }
 87 /**
 88  *  创建多线程方法四
 89  */
 90 - (void)createdThread4 {
 91     
 92     CustumOperation *custum = [[CustumOperation alloc] init];
 93     
 94     //start和main的区别： main只会调用方法不会开启新的线程
 95     [custum start];
 96 //    [custum main];
 97 }
 98 
 99 
100 
101 @end
时光见证了成长，还很无知，我想一点点幼稚转为有知！