为什么MPMovieLoadState有州5？ [英] why does MPMovieLoadState have state 5?

问题描述

我找到MPMoviePlayerController.h，有

I find MPMoviePlayerController.h,there is

enum {
    MPMovieLoadStateUnknown        = 0,
    MPMovieLoadStatePlayable       = 1 << 0,
    MPMovieLoadStatePlaythroughOK  = 1 << 1, // Playback will be automatically started in this state when shouldAutoplay is YES
    MPMovieLoadStateStalled        = 1 << 2, // Playback will be automatically paused in this state, if started
};
typedef NSInteger MPMovieLoadState;

但是当我做的时候

NSLog（@％d，player.loadState）

打印出5或有时3，它是如何发生的？我知道loadstate的值为0,1,2,4，请参阅开发人员文档。
谢谢！

it prints out 5 or sometimes 3,how did it happen?As i know the loadstate has value of 0,1,2,4 refer to developer documentation. Thank you!

推荐答案

playState是一个位掩码。可以设置任意数量的位，例如

The playState is a bitmask. Any number of bits can be set, such as

MPMovieLoadStatePlaythroughOK | MPMovieLoadStatePlayable

检查这样的州：

MPMovieLoadState state = [playerController loadState];
if( state & MPMovieLoadStatePlaythroughOK ) {
        NSLog(@"State is Playthrough OK");
} 

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