将特定时间的事件触发到MPMoviePlayerController播放的视频中(用于电影的自定义字幕) [英] Firing events at specific times into a video played by MPMoviePlayerController (for Custom Captions on Movie)

问题描述

我正在考虑实现SRT文件解析器，以将视频覆盖在MPMoviePlayerController类上.有人能想到一种在电影播放时在特定时间触发事件的可靠方法吗?

I'm considering implementing an SRT File parser for overlaying videos over an MPMoviePlayerController class. Can anyone think of a reliable way to fire off events at very specific times while a movie's playing?

推荐答案

嗯，对iOS的了解不如对AppKit的熟悉，但是看起来不像AppKit的NSTimer类直接对等.

Hmm, not as familiar with iOS as I am with AppKit, but doesn't look like there's a direct equivalent of AppKit's NSTimer class.

我想您总是可以使用CoreFoundation的CFTimer(位于CFRunLoop.h中)或NSObject的:-(void)performSelector:(SEL)aSelector withObject:(id)anArgument afterDelay:(NSTimeInterval)delay

I suppose you could always use CoreFoundation's CFTimer (found in CFRunLoop.h), or NSObject's: - (void)performSelector:(SEL)aSelector withObject:(id)anArgument afterDelay:(NSTimeInterval)delay

例如:

[self performSelector:@selector(updateSubtitle:) withObject:nextSubtitle afterDelay:0.5];

如果用户快进，快退或您想调用以下内容取消发生的所有预定事件，则:

If the user fast-forwards, or rewinds or something you'd want to call the following to cancel any scheduled events from happening:

[NSObject cancelPreviousPerformRequestsWithTarget:self];

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