基于Runloop 来实现手动保持线程生命周期
概要:开发者自己建立一个线程 ,触摸屏幕的时候会将让子线程去执行一个方法test 就是答应当前的线程对象;利用runloop中添加一个port来唤醒runloop来执行子线程活跃,并设置一个flag可以动释放改线程.
唤醒runloop
[[NSRunLoop currentRunLoop] addPort:[[NSPort alloc] init] forMode:NSDefaultRunLoopMode];
重写run方法
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantPast]];
注意不能使用 [NSRunLoop currentRunLoop] run] 因为它创立了一个永远也不能停止的runloop
核心代码:
self.thread = [[MyThread alloc] initWithBlock:^{
NSLog(@"%@---begin---",[NSThread currentThread]);
//
[[NSRunLoop currentRunLoop] addPort:[[NSPort alloc] init] forMode:NSDefaultRunLoopMode];
while (!weakSelf.stopped) {
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantPast]];
}
//[NSRunLoop currentRunLoop] run] 开启了一个永不销毁的runloop
NSLog(@"%@---end---",[NSThread currentThread]);
}];
代码如下:
//
// NextViewController.m
// RunLoop-线程保活
//
// Created by edz on 2020/3/4.
// Copyright © 2020 mende. All rights reserved.
//
#import "NextViewController.h"
#import "MyThread.h"
@interface NextViewController ()
@property (nonatomic, strong) MyThread *thread;
@property (nonatomic,assign) BOOL stopped;
@end
@implementation NextViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self.view setBackgroundColor:[UIColor orangeColor]];
// Do any additional setup after loading the view.
__weak typeof (self) weakSelf = self;
UIButton *nextBtn = [UIButton buttonWithType:UIButtonTypeCustom];
nextBtn.frame = CGRectMake(50, 200, 150, 50);
[nextBtn setTitle:@"STOP" forState:UIControlStateNormal];
[nextBtn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
[nextBtn addTarget:self action:@selector(stop) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:nextBtn];
self.thread = [[MyThread alloc] initWithBlock:^{
NSLog(@"%@---begin---",[NSThread currentThread]);
[[NSRunLoop currentRunLoop] addPort:[[NSPort alloc] init] forMode:NSDefaultRunLoopMode];
while (!weakSelf.stopped) {
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantPast]];
}
//[NSRunLoop currentRunLoop] run] 开启了一个永不销毁的runloop
NSLog(@"%@---end---",[NSThread currentThread]);
}];
[self.thread start];
}
//手动控制停止runloop中某个线程
- (void)stop{
[self performSelector:@selector(stopThread) onThread:self.thread withObject:nil waitUntilDone:NO];
}
//子线程调用方法
- (void)stopThread{
self.stopped = YES;
CFRunLoopStop(CFRunLoopGetMain());
NSLog(@"%s %@",__func__,[NSThread currentThread]);
}
//点击屏幕触 在子线程中执行某个方法
- (void)touchesBegan:(NSSet
[self performSelector:@selector(test) onThread:self.thread withObject:nil waitUntilDone:NO];
}
//子线程执行方法
- (void)test{
NSLog(@"%s %@",__func__,[NSThread currentThread]);
}
- (void)dealloc{
NSLog(@"%s",__func__);
// [self stop];
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
@end