ios – 正在播放视频时允许“自动锁定”

在iOS 9上测试过.

AVPlayer *player = // alloc init...
if ([player respondsToSELEctor:NSSELEctorFromString(@"_preventsSleepDuringVideoPlayBACk")]) {
    [player SETVALue:@(NO) forKey:@"preventsSleepDuringVideoPlayBACk"];
}