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| - (void)viewDidLoad {
[super viewDidLad];
NSThread *thread = [[NSThread alloc] initWithTarget:self selector:@selector(run) object:nil];
[thread start];
}
- (void)run {
NSLog(@"run");
}
// run -> thread deallo
// 线程保活
- (void)viewDidLoad {
[super viewDidLoad];
// initWithTarget:self 会强引用控制器 导致循环引用
// self.thread = [[NSThread alloc] initWithTarget:self selector:@selector(run) object:nil];
self.stopped = false;
__weak typeof(self) weakSelf = self;
self.thread = [[NSThread alloc] initWithBlock:^{
NSLog(@"run");
// [NSRunLoop currentRunLoop] 获取线程就是创建线程
// 需要往RunLoop添加Source/Timer/Observer
[[NSRunLoop currentRunLoop] addPort:[[NSPort alloc] init] forMode:NSDefaultRunLoopMode];
/*
it runs the receiver in the NSDefaultRunLoopMode by repeatedly invoking runMode:beforeDate:
In other words, this method effectively begins an infinite loop that processes data from the run loop’s input sources and timers.
[[NSRunLoop currentRunLoop] run] 相当于
while (1) {
[NSRunLoop currentRunLoop] runMode:<#(nonnull NSRunLoopMode)#> beforeDate:<#(nonnull NSDate *)#>
}
*/
// NSRunLoop 的 run 方法是无法停止的，他专门用于开启一个用不销毁的线程(RunLoop)
// [[NSRunLoop currentRunLoop] run];
//线程保活
while (weakSelf && !weakSelf.isStopped) {
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
}
NSLog(@"end");
}];
[self.thread start];
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
// 最后一个参数为 YES 会等待 线程中 test 方法执行完打印 123
// 最后一个参数为 NO 会直接打印 123
if (!self.thread) return;
[self performSelector:@selector(test) onThread:self.thread withObject:nil waitUntilDone:NO];
NSLog(@"123");
}
- (void)test {
NSLog(@"test");
}
- (void)stop {
if (!self.thread) return;
// waitUntilDone 只能为 YES
// NO 会造成野指针 控制销毁和子线程 stop方法同时进行 控制器坏内存
[self performSelector:@selector(stopThread) onThread:self.thread withObject:nil waitUntilDone:YES];
}
// 用于停止子线程的 RunLoop
- (void)stopThread {
self.stopped = true;
CFRunLoopStop(CFRunLoopGetCurrent());
self.thread = nil;
}
- (void)dealloc {
[self stop];
// dealloc 执行完毕 weakSelf 为空
}
|