IOS RunLoop 常驻线程的实现

线程常驻，正如其名，我们要实现的事让一个线程长期存在，不被销毁。

这时会有人说，那还不简单吗。

但是这里我们要实现的事如何让线程座椅待命，而且并不是主线程。

首先介绍一下正常情况下的线程使用。

//
//  ViewController.m
//  CX RunLoop 常驻线程的实现
//
//  Created by ma c on 16/3/30.
//  Copyright © 2016年 xubaoaichiyu. All rights reserved.
//#import "ViewController.h"
#import "CXThread.h"
@interface ViewController ()@property (nonatomic, strong)CXThread * thread;@end@implementation ViewController- (void)viewDidLoad {
    [super viewDidLoad];     NSThread* thread = [[CXThread alloc]initWithTarget:self selector:@selector(run) object:nil];    [thread start];}
-(void)run{    NSLog(@"run －－ 旭宝爱吃鱼");}
-(void)test{    NSLog(@"test -- 旭宝爱吃鱼 %@",[NSThread currentThread]);}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{    [self test];    //让test方法在线程thread上实现
//    [self performSelector:@selector(test) onThread:_thread withObject:nil waitUntilDone:nil];}
@end

上面的代码知识简单的实现了线程的使用。

下面是其效果图(注意线程的销毁)

实际上test与thread并没有关系。

我知识简单的让其输出默认的主线程日志，以供后面对比。

下面是让thread为全局变量

//
//  ViewController.m
//  CX RunLoop 常驻线程的实现
//
//  Created by ma c on 16/3/30.
//  Copyright © 2016年 xubaoaichiyu. All rights reserved.
//#import "ViewController.h"
#import "CXThread.h"
@interface ViewController ()@property (nonatomic, strong)CXThread * thread;@end@implementation ViewController- (void)viewDidLoad {
    [super viewDidLoad];     _thread = [[CXThread alloc]initWithTarget:self selector:@selector(run) object:nil];    [_thread start];}
-(void)run{    NSLog(@"run －－ 旭宝爱吃鱼");}
-(void)test{    NSLog(@"test -- 旭宝爱吃鱼 %@",[NSThread currentThread]);}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{    [self test];    //让test方法在线程thread上实现
//    [self performSelector:@selector(test) onThread:_thread withObject:nil waitUntilDone:nil];}
@end

由效果图我们可以发现。thread并没有销毁。而且test，依旧是在主线程上实现的。

但我们想要的是test在thread上实现（实际开发中是不允许耗时操作在主线程中的）

我们让test在thread中实现：（注意虾米那方法并不成功）

//
//  ViewController.m
//  CX RunLoop 常驻线程的实现
//
//  Created by ma c on 16/3/30.
//  Copyright © 2016年 xubaoaichiyu. All rights reserved.
//#import "ViewController.h"
#import "CXThread.h"
@interface ViewController ()@property (nonatomic, strong)CXThread * thread;@end@implementation ViewController- (void)viewDidLoad {
    [super viewDidLoad];     _thread = [[CXThread alloc]initWithTarget:self selector:@selector(run) object:nil];    [_thread start];}
-(void)run{    NSLog(@"run －－ 旭宝爱吃鱼");}
-(void)test{    NSLog(@"test -- 旭宝爱吃鱼 %@",[NSThread currentThread]);}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{//    让test方法在线程thread上实现
    [self performSelector:@selector(test) onThread:_thread withObject:nil waitUntilDone:YES];}
@end

为什么会不成功呢？？（我真的点击了）

原因是我们只是单纯的建立了一个线程。。。很单纯的。。。考虑一下我们该怎么做。

那么我们有两种做法实现。

方法一（比较正常的方法）

//
//  ViewController.m
//  CX RunLoop 常驻线程的实现
//
//  Created by ma c on 16/3/30.
//  Copyright © 2016年 xubaoaichiyu. All rights reserved.
//#import "ViewController.h"
#import "CXThread.h"
@interface ViewController ()@property (nonatomic, strong)CXThread * thread;@end@implementation ViewController- (void)viewDidLoad {
    [super viewDidLoad];     _thread = [[CXThread alloc]initWithTarget:self selector:@selector(run) object:nil];    [_thread start];}
-(void)run{    NSLog(@"run －－ 旭宝爱吃鱼");
    //添加Port 实时监听
    [[NSRunLoop currentRunLoop] addPort:[NSPort port] forMode:NSDefaultRunLoopMode];
    //添加runloop
    [[NSRunLoop currentRunLoop]run];}
-(void)test{    NSLog(@"test -- 旭宝爱吃鱼 %@",[NSThread currentThread]);}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{//    让test方法在线程thread上实现
    [self performSelector:@selector(test) onThread:self.thread withObject:nil waitUntilDone:NO];}
@end

就是这么简单。

方法二

//
//  ViewController.m
//  CX RunLoop 常驻线程的实现
//
//  Created by ma c on 16/3/30.
//  Copyright © 2016年 xubaoaichiyu. All rights reserved.
//#import "ViewController.h"
#import "CXThread.h"
@interface ViewController ()@property (nonatomic, strong)CXThread * thread;@end@implementation ViewController- (void)viewDidLoad {
    [super viewDidLoad];     _thread = [[CXThread alloc]initWithTarget:self selector:@selector(run) object:nil];    [_thread start];}
-(void)run{    NSLog(@"run －－ 旭宝爱吃鱼");    while () {
        //添加runloop
        [[NSRunLoop currentRunLoop]run];
    }
}
-(void)test{    NSLog(@"test -- 旭宝爱吃鱼 %@",[NSThread currentThread]);}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{//    让test方法在线程thread上实现
    [self performSelector:@selector(test) onThread:self.thread withObject:nil waitUntilDone:NO];}
@end

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