取消RACCommand执行

本文介绍了取消RACCommand执行的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

有没有办法取消执行 RACCommand ？

例如，我有一个命令无限执行信号如下：

  RACCommand * command = [[RACCommand alloc] initWithSignalBlock：^ RACSignal *（id input）{
 return [RACSignal createSignal：^ RACDisposable *（id< RACSubscriber> subscriber）{
 __block BOOL stop = NO; 
 
 while（！stop）{
 [subscriber sendNext：nil]; 
} 
 
 return [RACDisposable disposableWithBlock：^ {
 stop = YES; 
}]; 
}]; 
}];因此，如何在调用 [command execute：nil]之后停止它

$ b ？

解决方案

我对RACCommand有点陌生，所以我不确定有更好的方法来做到这一点。但我一直用 takeUntil：来取消信号。

  RACCommand * command = [[RACCommand alloc] initWithSignalBlock：^ RACSignal *（id input）{
 return [RACSignal createSignal：^ RACDisposable *（id< RACSubscriber> subscriber）{
 while（true）{ 
 [subscriber sendNext：nil]; 
} 
}] takeUntil：cancellationSignal]; 
}];

Is there any way to cancel execution of a RACCommand?

For example I have a command with infinite execution signal like this:

RACCommand *command = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) {
    return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
        __block BOOL stop = NO;

        while (!stop) {
            [subscriber sendNext:nil];
        }

        return [RACDisposable disposableWithBlock:^{
            stop = YES;
        }];
    }];
}];

So how can I stop it after calling [command execute:nil]?

解决方案

I'm a bit new to RACCommand, so I'm not certain there's a better way to do this. But I have been using takeUntil: with a cancellation signal to halt execution.

RACCommand *command = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) {
    return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
        while (true) {
            [subscriber sendNext:nil];
        }
    }] takeUntil:cancellationSignal];
}];

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