我正在使用串行GCD队列与Realm进行交互。当GCD开始在队列中切换线程时,应用程序会崩溃并提示“从错误的线程访问Realm”的异常。是否有办法使用GCD API将给定的realm绑定到线程上?
以下是一个快速示例:
self.realmQueue = dispatch_queue_create("db", DISPATCH_QUEUE_SERIAL);
__block RLMRealm *realm = nil;
dispatch_async(self.realmQueue, ^{
realm = [RLMRealm realmWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:@"temp"]];
});
self.motionManager = [[CMMotionManager alloc] init];
self.motionManager.accelerometerUpdateInterval = 0.001;
__block int i = 0;
__block BOOL shouldBeginWriteTransaction = YES;
[self.motionManager startAccelerometerUpdatesToQueue:[[NSOperationQueue alloc] init] withHandler:^(CMAccelerometerData *accelerometerData, NSError *error) {
dispatch_async(self.realmQueue, ^{
if (shouldBeginWriteTransaction) {
[realm beginWriteTransaction];
shouldBeginWriteTransaction = NO;
}
AccelerationEvent *event = [[AccelerationEvent alloc] init];
event.x = accelerometerData.acceleration.x;
event.y = accelerometerData.acceleration.x;
event.z = accelerometerData.acceleration.y;
event.time = [NSDate date];
[realm addObject:event];
if (i % 1000) {
dispatch_async(dispatch_get_main_queue(), ^{
self.xLabel.text = [NSString stringWithFormat:@"%f", event.x];
self.yLabel.text = [NSString stringWithFormat:@"%f", event.y];
self.zLabel.text = [NSString stringWithFormat:@"%f", event.z];
});
}
if (i % 10000 == 0) {
NSDate *startDate = [NSDate date];
[realm commitWriteTransaction];
NSLog(@"save time: %f", [[NSDate date] timeIntervalSinceDate:startDate]);
shouldBeginWriteTransaction = YES;
}
i++;
});
}];