完整路徑
NSString* index=@"/var/mobile/Containers/Data/Application/45471D33-E611-499D-AFA1-856880F47549/Documents/1543976290.wav";
對路徑截取的9種操作
NSLog(@"%@",[index lastPathComponent]);
輸出：1543976290.wav
NSLog(@"%@",[index stringByDeletingLastPathComponent]);
輸出：/var/mobile/Containers/Data/Application/45471D33-E611-499D-AFA1-856880F47549/Documents
NSLog(@"%@",[index pathExtension]);
輸出：wav
NSLog(@"%@",[index stringByDeletingPathExtension]);
輸出：/var/mobile/Containers/Data/Application/45471D33-E611-499D-AFA1-856880F47549/Documents/1543976290
NSLog(@"%@",[index stringByAbbreviatingWithTildeInPath]);
輸出：~/Documents/1543976290.wav
NSLog(@"%@",[index stringByExpandingTildeInPath]);
輸出：/var/mobile/Containers/Data/Application/45471D33-E611-499D-AFA1-856880F47549/Documents/1543976290.wav
NSLog(@"%@",[index stringByStandardizingPath]);
輸出：/var/mobile/Containers/Data/Application/45471D33-E611-499D-AFA1-856880F47549/Documents/1543976290.wav
NSLog(@"%@",[index stringByResolvingSymlinksInPath]);
輸出：/var/mobile/Containers/Data/Application/45471D33-E611-499D-AFA1-856880F47549/Documents/1543976290.wav
NSLog(@"%@",[[index lastPathComponent] stringByDeletingPathExtension]);
輸出：1543976290