TXImageSprite

Service Level Agreement

On-demand sprite sheet parsing utility class.

Set the sprite sheet address. After configuration, it will start a child thread to download the sprite sheet and parse it.

- (void)setVTTUrl:(NSURL *)vttUrl imageUrls:(NSArray<NSURL *> *)images;

Retrieve a thumbnail, return nil if retrieval fails.

Parameter Name	Type	Description
vttUrl	NSURL	sprite sheet web vtt description file download URL.
images	NSArray<NSURL *>	sprite sheet image download URL.

Parameter Name	Type	Description
time	GLfloat	Time point, unit: seconds.