如何修复“exc_bad_instruction (code=exc_i386_invop subcode=0x0)”
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【中文标题】如何修复“exc_bad_instruction (code=exc_i386_invop subcode=0x0)”【英文标题】:How to fix "exc_bad_instruction (code=exc_i386_invop subcode=0x0)" 【发布时间】:2016-06-27 15:46:39 【问题描述】:我想在我的应用程序中制作一个计时器,但我发现了这样一个问题:
我的代码在包含以下代码的 viewController 上运行得很好,但是在我关闭这个 viewController 几秒钟后,Xcode 会报告一个错误:exc_bad_instruction (code=exc_i386_invop subcode=0x0
如果我不使用dispatch_suspend(self.timer)
和dispatch_resume(self.timer)
,一切都会好的
否则,我可以看到 Xcode 处理 [viewController .cxx_destruct]
时会发生错误
那么,谁能告诉我如何解决它?
谢谢
这是我的代码,
- (void)timeButtonClick:(UIButton *)button
if (self.isTiming == YES)
self.isTiming = NO;
self.executeTime = [self.timeButton currentTitle];
dispatch_suspend(self.timer);
else if (self.isTiming == NO)
self.isTiming = YES;
self.createDate = [NSDate date];
dispatch_resume(self.timer);
- (dispatch_object_t)timer
if (_timer == nil)
dispatch_queue_t timerQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_source_t timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, timerQueue);
dispatch_source_set_timer(timer, DISPATCH_TIME_NOW, 1 * NSEC_PER_SEC, 0 * NSEC_PER_SEC);
__weak typeof (self)weakSelf = self;
dispatch_source_set_event_handler(timer, ^
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = @"HH:mm:ss";
NSCalendar *calendar = [NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian];
NSCalendarUnit unit = NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
NSDate *currentDate = [NSDate date];
NSDateComponents *currentCmps = [calendar components:unit fromDate:weakSelf.createDate toDate:currentDate options:NSCalendarWrapComponents];
NSDate *executeTime = [dateFormatter dateFromString:weakSelf.executeTime];
NSDateComponents *executeCmps = [calendar components:unit fromDate:executeTime];
NSString *newExecuteTime = [NSString stringWithFormat:@"%02ld:%02ld:%02ld", executeCmps.hour + currentCmps.hour, executeCmps.minute + currentCmps.minute, executeCmps.second + currentCmps.second];
dispatch_async(dispatch_get_main_queue(), ^
[weakSelf.timeButton setTitle:newExecuteTime forState:UIControlStateNormal];
);
);
_timer = timer;
return _timer;
【问题讨论】:
【参考方案1】:将您的计时器移动到另一个地方,例如 AppDelegate,您会收到此错误,因为您正在将计时器分派到另一个线程,然后当 VC 被关闭时,计时器想要将标题设置为 timeButton,当 VC 被销毁时,它已经被销毁了被解雇了。
你也可以试着做一个强弱的自己,但我真的建议你把计时器代码移到另一个类。
【讨论】:
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