iOS runloop 创建一个和App生命周期相同的线程

//
// NetWorkRequestThread.m
// test_nstherad_port_02
// Created by jeffasd on 16/7/25.
// Copyright © 2016年 jeffasd. All rights reserved.
// 创建一个和app生命周期相同的线程并一直请求发起网络请求

#import "NetWorkRequest.h"

@interface NetWorkRequest ()

@property (nonatomic, strong) NSTimer *timer;

@end

@implementation NetWorkRequest

+ (instancetype)shareNetRequest{

static NetWorkRequest *_networkRequest = nil;
if (_networkRequest == nil) {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
_networkRequest = [[self alloc] init];
});
}
return _networkRequest;
}

+ (NSThread *)shareNetworkRequestThread{

static NSThread *_networkRequestThread = nil;
if (_networkRequestThread == nil) {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
_networkRequestThread = [[NSThread alloc] initWithTarget:self selector:@selector(networkrRequestThreadEntryPoint:) object:nil];
[_networkRequestThread start];
});
}
return _networkRequestThread;
}

+(void)networkrRequestThreadEntryPoint:(id)__unused object{

[[NSThread currentThread] setName:@"networkRequestThread"];
NSRunLoop *runloop = [NSRunLoop currentRunLoop];
//添加一个port监听让runloop一直处于运行状态 好让thread不被回收
[runloop addPort:[NSMachPort port] forMode:NSDefaultRunLoopMode];

#if 0
BOOL isRuning = YES;
while (isRuning) {
//此方法添加的runloop可以用CFRunLoopStop(runLoopRef)来停止RunLoop的运行
//子线程中的runmode不能使用NSRunLoopCommonModes
// [runloop runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
//一直监听线程是否有消息输入（default模式），有当前线程就开始工作，没有就休眠。进行一次消息轮询，如果没有任务需要处理的消息源，则直接返回
BOOL isRuning = [runloop runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
//此方法停止runloop要设置isRuning为NO 不是很方便 使用 CFRunLoopRun(); 方法来代替
NSLog(@"isRuning is %@", isRuning ? @"YES" : @"NO");
}
#endif

//可以很方便暂停runloop循环
CFRunLoopRun();

}

- (void)start{

[self performSelector:@selector(startNetWorkRequest) onThread:[[self class] shareNetworkRequestThread] withObject:nil waitUntilDone:NO];
}

- (void)startNetWorkRequest{

// NSThread *currentThread = [NSThread currentThread];
// NSLog(@"currentThread is %@", currentThread);
// NSLog(@"runLoop is %@", [NSRunLoop currentRunLoop]);
NSLog(@"do Something");

self.timer = [NSTimer timerWithTimeInterval:1.0 target:self selector:@selector(getMessageFormRemoteService) userInfo:nil repeats:YES];

[[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSDefaultRunLoopMode];

}

- (void)getMessageFormRemoteService{

NSLog(@"currentThread is %@", [NSThread currentThread]);
NSLog(@"service -- ");
}

- (void)cancel{

NSThread *therad = [[self class] shareNetworkRequestThread];

NSLog(@"the thread is %@", therad.executing ? @"YES" : @"NO");
NSLog(@"the thread is %@", therad.finished ? @"YES" : @"NO");
NSLog(@"the thread is %@", therad.cancelled ? @"YES" : @"NO");

NSLog(@"the thread is %@", therad);

[self performSelector:@selector(cancelNetWorkRequest) onThread:[[self class] shareNetworkRequestThread] withObject:nil waitUntilDone:NO];
}

- (void)cancelNetWorkRequest{

NSThread *currentThread = [NSThread currentThread];
NSLog(@"currentThread is %@", currentThread);

CFRunLoopStop([NSRunLoop currentRunLoop].getCFRunLoop);
// CFRunLoopStop(CFRunLoopGetCurrent());
}

@end