ProgressDirection
Objective-C
enum ProgressDirection : NSInteger {}Swift
enum ProgressDirection : Int, @unchecked SendableProgress 진행 방향
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                  시작점에서 끝점으로 진행 DeclarationObjective-C ProgressDirectionForward = 0Swift case forward = 0
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                  끝점에서 시작점으로 진행 DeclarationObjective-C ProgressDirectionBackwardSwift case backward = 1
 ProgressDirection Enumeration Reference
      ProgressDirection Enumeration Reference