源码-0501-01-处理耗时操作

多线程,异步存在的原因(程序运行时卡顿/假死状态),耗时操作移步到后台操作;

模拟耗时操作

//  ViewController.m
//  01-处理耗时操作
#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (IBAction)buttonClick {
    for (NSInteger i = 0; i<50000; i++) {
        NSLog(@"------buttonClick---%zd", i);
    }
}

@end

 

02-了解-pthread

 

//  ViewController.m
//  02-了解-pthread
#import "ViewController.h"
#import <pthread.h>

@interface ViewController ()

@end

@implementation ViewController

void * run(void *param)
{
    for (NSInteger i = 0; i<50000; i++) {
        NSLog(@"------buttonClick---%zd--%@", i, [NSThread currentThread]);
    }
    return NULL;
}

- (IBAction)buttonClick:(id)sender {
    pthread_t thread; //定义一个线程对象thread,他是一个地址。NULL是线程的一个属性;指向函数的指针;

    pthread_create(<#pthread_t  _Nullable *restrict _Nonnull#>, <#const pthread_attr_t *restrict _Nullable#>,

            <#void * _Nullable (* _Nonnull)(void * _Nullable)#>, <#void *restrict _Nullable#>);

 pthread_create(&thread, NULL, run, NULL); pthread_t thread2; pthread_create(&thread2, NULL, run, NULL); }

@end

 

03-掌握-NSThread

 

//  ViewController.m
//  03-掌握-NSThread
#import "ViewController.h"
#import "XMGThread.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {//屏幕点击的时候会掉用的事件;
    [self createThread3];
}

- (void)createThread3
{  //隐式创建并启动线程
    [self performSelectorInBackground:@selector(run:) withObject:@"jack"]; //连self都不传了。。。。。
}

- (void)createThread2
{  //创建线程后自动启动线程--这种是不能设置名字,是拿不到这个线程修改/设置属性;
    [NSThread detachNewThreadSelector:@selector(run:) toTarget:self withObject:@"rose"];
}

- (void)createThread1
{
    //    // 创建线程
    //    NSThread *thread = [[NSThread alloc] initWithTarget:self selector:@selector(run:) object:@"jack"];
      //这种方法创建的线程是有名字的
// // 启动线程 // [thread start]; // 创建线程(使用自定义的 XMGThread *thread = [[XMGThread alloc] initWithTarget:self selector:@selector(run:) object:@"jack"];
                                 调用 self 的 run:方法 传的参数 是 object:... thread.name
= @"my-thread"; // 启动线程 [thread start]; } - (void)run:(NSString *)param { for (NSInteger i = 0; i<100; i++) { NSLog(@"-----run-----%@--%@", param, [NSThread currentThread]); }

  [thread isMainThread] //类方法:判断线程是否是主线程;


}

@end

自定义了一个Thread对象,继承了Thread

//
//  XMGThread.h
//  03-掌握-NSThread
#import <Foundation/Foundation.h>

@interface XMGThread : NSThread

@end
//  XMGThread.m
//  03-掌握-NSThread
#import "XMGThread.h"

@implementation XMGThread
- (void)dealloc
{
    NSLog(@"XMGThread -- dealloc");
}
@end

 

posted @ 2017-03-15 11:45  laugh  阅读(186)  评论(0编辑  收藏  举报