iOS AVPlayer判断 播放/暂停 状态

在做视频变速的时候发现，当设置AVPlayer.rate时，视频会自动播放,于是在AVPlayer里面找了很久也没发现任何关于playing或者pause的字眼，一个意外看到：

/*!
 @property      timeControlStatus
 @abstract      Indicates whether playback is currently paused indefinitely, suspended while waiting for appropriate conditions, or in progress.
 @discussion    For possible values and discussion, see AVPlayerTimeControlStatus.
 
When automaticallyWaitsToMinimizeStalling is YES, absent intervention in the form of invocations of -setRate: or -pause or, on iOS, an interruption that requires user intervention before playback can resume, the value of the property timeControlStatus automatically changes between AVPlayerTimeControlStatusPlaying and AVPlayerTimeControlStatusWaitingToPlayAtSpecifiedRate depending on whether sufficient media data is available to continue playback. This property is key value observable.
*/
@property (nonatomic, readonly) AVPlayerTimeControlStatus timeControlStatus API_AVAILABLE(macos(10.12), ios(10.0), tvos(10.0), watchos(3.0));

状态有这3个

/*!
 @enum AVPlayerTimeControlStatus
 @abstract
    These constants are the allowable values of AVPlayer's timeControlStatus property. This discussion pertains when automaticallyWaitsToMinimizeStalling is YES, the default setting, and exceptions are discussed in connection with automaticallyWaitsToMinimizeStalling.
 
 @constant   AVPlayerTimeControlStatusPaused
    This state is entered upon receipt of a -pause message, an invocation of -setRate: with a value of 0.0, when a change in overall state requires playback to be halted, such as when an interruption occurs on iOS, as announced by AVAudioSession.
    In this state, playback is paused indefinitely and will not resume until 1) a subsequent -play message is received or 2) a -setRate: or -playImmediatelyAtRate: message with a non-zero value for rate is received and sufficient media data has been buffered for playback to proceed.
 @constant   AVPlayerTimeControlStatusWaitingToPlayAtSpecifiedRate
    This state is entered when 1) the playback buffer becomes empty and playback stalls in AVPlayerTimeControlStatusPlaying, 2) when rate is set from zero to non-zero in AVPlayerTimeControlStatusPaused and insufficient media data has been buffered for playback to occur, or 3) when the player has no item to play, i.e. when the receiver's currentItem is nil.
    In this state, the value of the rate property is not currently effective but instead indicates the rate at which playback will start or resume. Refer to the value of reasonForWaitingToPlay for details about why the receiver is waiting and the conditions that allow waitStatus to change to AVPlayerWaitStatusPlaying.
    While waiting for buffering, you can attempt to start playback of any available media data via -playImmediatelyAtRate:.
 @constant   AVPlayerTimeControlStatusPlaying
    In this state, playback is currently progressing and rate changes will take effect immediately. Should playback stall because of insufficient media data, timeControlStatus will change to AVPlayerTimeControlStatusWaitingToPlayAtSpecifiedRate.
 */
typedef NS_ENUM(NSInteger, AVPlayerTimeControlStatus) {
    AVPlayerTimeControlStatusPaused = 0,
    AVPlayerTimeControlStatusWaitingToPlayAtSpecifiedRate = 1,
    AVPlayerTimeControlStatusPlaying = 2
} API_AVAILABLE(macos(10.12), ios(10.0), tvos(10.0), watchos(3.0));

所以通过player. timeControlStatus就可以判断啦！