Question

我将JSON数据放入表格视图中，并且我尝试使用for循环解析数据。但是，当循环完成解析JSON数据并将20个项放入表视图时，它会重新启动进程，再次解析JSON，同样的数据再次出现在表视图中。这个过程也会重复很长时间。

 `    

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

    guard let location = locations.last else{ return }

    searchURL = "https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=\(location.coordinate.latitude),\(location.coordinate.longitude)&radius=50000&types=night_club&key=MY_API_KEY"

    cityInfo = "https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=\(location.coordinate.latitude),\(location.coordinate.longitude)&radius=50000&types=locality&key=MY_API_KEY"

    locationManager.stopUpdatingLocation()
    locationManager.delegate = nil

    getCityInfo(url: cityInfo)
    callAlamo(url: searchURL)
}

更新

正如vadian在他的第一条评论中提到的那样，parseData（）被多次调用。所以我添加了

locationManager.delegate = nil

在我停止更新locationManager委托函数中的位置后。

==14227== HEAP SUMMARY:
==14227==     in use at exit: 72,704 bytes in 1 blocks
==14227==   total heap usage: 3 allocs, 2 frees, 73,760 bytes allocated
==14227== 
==14227== LEAK SUMMARY:
==14227==    definitely lost: 0 bytes in 0 blocks
==14227==    indirectly lost: 0 bytes in 0 blocks
==14227==      possibly lost: 0 bytes in 0 blocks
==14227==    still reachable: 72,704 bytes in 1 blocks
==14227==         suppressed: 0 bytes in 0 blocks
==14227== Rerun with --leak-check=full to see details of leaked memory 
==14227==

`

此后其他所有内容都保持不变。

Answer 1

我怀疑您多次致电parseData。解决方案是在委托方法中停止监视位置。

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

    guard let location = locations.last else { return }

    let searchURL = "https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=\(location.coordinate.latitude),\(location.coordinate.longitude)&radius=50000&types=night_club&key=AIzaSyA2LQsGK_I1ETnKPGbjWgFW9onZlHog6dg"

    // var cityInfo = NSString(format: "https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=%f,%f&radius=50000&types=locality&key=AIzaSyA2LQsGK_I1ETnKPGbjWgFW9onZlHog6dg", (location?.coordinate.latitude)!,(location?.coordinate.longitude)!) as? String
    manager.stopUpdatingLocation()
    callAlamo(url: searchURL)
}

我编辑了方法的主体，以避免所有问题和感叹号。

附注：基本上不注释编译器可以推断的类型。

For循环保持迭代解析JSON，即使条件完成

1 个答案: