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[已解决]swift中dispatch_resume timer崩溃

iOS crifan 1519浏览 0评论

之前代码:

    func startMarkHasRead(curMsgTVC:MessageTableViewController) {

        gLog.debug("curMsgTVC=\(curMsgTVC), name=\(curMsgTVC.contactItem.name), id=\(curMsgTVC.contactItem.id)")

        let startTime:dispatch_time_t = dispatch_time(DISPATCH_TIME_NOW, 0)

        let intervalInSec:UInt64 = MarkHasReadIntervalInSec * NSEC_PER_SEC

        let leeway:UInt64 = 0 * NSEC_PER_SEC

        dispatch_source_set_timer(self.markHasReadTimer, startTime, intervalInSec, leeway)

       

        dispatch_source_set_event_handler(self.markHasReadTimer, {

            self.tryMarkHasRead(curMsgTVC)

        })

       

        dispatch_resume(self.markHasReadTimer)

    }

   

    func endMarkHasRead(curMsgTVC:MessageTableViewController) {

        gLog.debug("curMsgTVC=\(curMsgTVC), name=\(curMsgTVC.contactItem.name), id=\(curMsgTVC.contactItem.id)")

       

        dispatch_source_cancel(self.markHasReadTimer)

    }

发现第二次执行到:

dispatch_source_cancel(self.markHasReadTimer)

就崩溃了:

后来改为:

    func startMarkHasRead(curMsgTVC:MessageTableViewController) {

        dispatch_source_cancel(self.markHasReadTimer)

        gLog.debug("curMsgTVC=\(curMsgTVC), name=\(curMsgTVC.contactItem.name), id=\(curMsgTVC.contactItem.id)")

        let startTime:dispatch_time_t = dispatch_time(DISPATCH_TIME_NOW, 0)

        let intervalInSec:UInt64 = MarkHasReadIntervalInSec * NSEC_PER_SEC

        let leeway:UInt64 = 0 * NSEC_PER_SEC

        dispatch_source_set_timer(self.markHasReadTimer, startTime, intervalInSec, leeway)

       

        dispatch_source_set_event_handler(self.markHasReadTimer, {

            self.tryMarkHasRead(curMsgTVC)

        })

       

        dispatch_resume(self.markHasReadTimer)

    }

   

    func endMarkHasRead(curMsgTVC:MessageTableViewController) {

        gLog.debug("curMsgTVC=\(curMsgTVC), name=\(curMsgTVC.contactItem.name), id=\(curMsgTVC.contactItem.id)")

       

        dispatch_source_cancel(self.markHasReadTimer)

    }

问题依旧。

后来注意到了:

ios – Swift – Do something every x minutes – Stack Overflow

中的:

dispatch_source_cancel(timer)

之后的:timer = nil

dispatch source cancel crash

iphone – dispatch_source_cancel on a suspended timer causes EXC_BAD_INSTRUCTION – Stack Overflow

iOS 中的timer — NSRunLoopCommonModes和Timer .NSThread和Timer.GCD中的Timer – Dev_APP的专栏 – 博客频道 – CSDN.NET

好像可以suspend?

去用:

    func endMarkHasRead(curMsgTVC:MessageTableViewController) {

        gLog.debug("curMsgTVC=\(curMsgTVC), name=\(curMsgTVC.contactItem.name), id=\(curMsgTVC.contactItem.id)")

       

//        dispatch_source_cancel(self.markHasReadTimer)

        dispatch_suspend(self.markHasReadTimer)

    }

即可

-》

之后,再去重复的调用:

dispatch_resume(self.markHasReadTimer)

就不会崩溃了。

转载请注明:在路上 » [已解决]swift中dispatch_resume timer崩溃

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