为多个文件下载添加子进度

Question

我在我的项目中使用AFNetworking 3.0下载多个文件。我想显示所有文件的单个下载进度。我将每个文件下载的每个子进度添加到父进程。但它没有用，应用程序崩溃了。我收到了错误 -

 public static int[] f (final int[] nums, int target) {
    int[] r = new int[2];
    r[0] = -1;
    r[1] = -1;
    int[] vIndex = new int[0Xfff];
    for (int i = 0; i < nums.length; i++) {
        int delta = 0Xff;
        int gapIndex = target - nums[i] + delta;
        if (vIndex[gapIndex] != 0) {
            r[0] = vIndex[gapIndex];
            r[1] = i + 1;
            return r;
        } else {
            vIndex[nums[i] + delta] = i + 1;
        }
    }
    return r;
}

这是我的下载课程 -

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '<DownloadManager: 0x7f92e2f6e130>: An -observeValueForKeyPath:ofObject:change:context: message was received but not handled.
Key path: fractionCompleted

Answer 1

您忘记实施observeValueForKeyPath:ofObject:change:context:方法。

- (void)observeValueForKeyPath:(NSString *)keyPath
                      ofObject:(id)object
                        change:(NSDictionary<NSString *, id> *)change
                       context:(void *)context {
    if ([keyPath isEqualToString:@"fractionCompleted"]) {
        // process value
    }
}