小编Nem*_*emo的帖子

我有要并行处理的元素集合.当我使用a时List,并行性有效.但是,当我使用a时Set,它并不是并行运行的.

我写了一个显示问题的代码示例:

public static void main(String[] args) {
    ParallelTest test = new ParallelTest();

    List<Integer> list = Arrays.asList(1,2);
    Set<Integer> set = new HashSet<>(list);

    ForkJoinPool forkJoinPool = new ForkJoinPool(4);

    System.out.println("set print");
    try {
        forkJoinPool.submit(() ->
            set.parallelStream().forEach(test::print)
        ).get();
    } catch (Exception e) {
        return;
    }

    System.out.println("\n\nlist print");
    try {
        forkJoinPool.submit(() ->
            list.parallelStream().forEach(test::print)
        ).get();
    } catch (Exception e) {
        return;
    }   
}

private void print(int i){
    System.out.println("start: " + i);
    try {
        TimeUnit.SECONDS.sleep(1);
    } catch (InterruptedException e) {
    }
    System.out.println("end: …

在 ios 13 上 PHImageManagerMaximumSize 不起作用。

打电话时

let manager = PHImageManager.default()
let option = PHImageRequestOptions()
option.isSynchronous = synchronous
option.isNetworkAccessAllowed = true
option.resizeMode = .exact

manager.requestImage(for: asset, targetSize: PHImageManagerMaximumSize, contentMode: .aspectFill, options: option, resultHandler: {(result, info) in
})

requestImage 返回错误：Error Domain=NSCocoaErrorDomain Code=-1 "(null)"

此代码在 ios12 上运行良好

你能告诉我如何在ios13上获取原始图像吗？