Question

注意：我的问题是scrollView的方向将滚动，而不是滚动。也就是说，当用户滚动scrollView时，我们可以得到方向scrollView将在scrollView开始滚动之前滚动？

有什么想法吗？先谢谢。

Answer 1

通过使用滚动视图委托，您可以识别。

目标C：

class MyStreamConsumerSpecs extends FunSpec with BeforeAndAfterAll with Matchers {
  implicit val config =
    StreamConfig(streamTcpPort = 9092, streamStateTcpPort = 2181, stream = "test-topic", numOfPartition = 1)

  val kafkaStream = new KafkaEmbeddedStream

  override protected def beforeAll(): Unit = {
    kafkaStream.startBroker
  }

  override protected def afterAll(): Unit = {
    kafkaStream.destroyBroker
  }

  describe("Kafka Embedded stream") {
    it("does consume some events") {

      //uses application.properties
      //emitter.broker.endpoint=localhost:9092
      //emitter.event.key.serializer=org.apache.kafka.common.serialization.StringSerializer
      //emitter.event.value.serializer=org.apache.kafka.common.serialization.StringSerializer
      kafkaStream.appendEvent("test-topic", """{"MyEvent" : { "myKey" : "myValue"}}""")

      val consumerProperties = new Properties()
      consumerProperties.put("bootstrap.servers", "localhost:9092")
      consumerProperties.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer")
      consumerProperties.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer")
      consumerProperties.put("group.id", "something")
      consumerProperties.put("auto.offset.reset", "earliest")

      val myConsumer = new KafkaConsumer[String, String](consumerProperties)
      myConsumer.subscribe(java.util.Collections.singletonList("test-topic"))

      val events = myConsumer.poll(2000)

      events.count() shouldBe 1
      events.iterator().next().value() shouldBe """{"MyEvent" : { "myKey" : "myValue"}}"""
      println("=================" + events.count())
    }
  }
}

斯威夫特：

- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView {
    CGPoint point = [scrollView.panGestureRecognizer translationInView:scrollView.superview];
    if (point.y > 0) {
        // Dragging down
    } else {
        // Dragging up
    }
}

如何判断UIScrollView的方向是否会滚动？

1 个答案: