NSString (NSStringPathExtensions) 类的相关方法和属性梳理

• stringByDeletingLastPathComponent

_rootPath = [@"/var/mobile/Containers/Data/Application/xxxxx" stringByDeletingLastPathComponent];
NSLog(@"%@",_rootPath);
打印结果：/var/mobile/Containers/Data/Application

• lastPathComponent

_rootPath = [@"/var/mobile/Containers/Data/Application/xxxxx" lastPathComponent];
NSLog(@"%@",_rootPath);
打印结果：xxxxx

• stringByExpandingTildeInPath

_rootPath = [@"~" stringByExpandingTildeInPath];
NSLog(@"%@",_rootPath);
打印结果：/var/mobile/Containers/Data/Application/D602EC89-5359-4DF4-AD6F-3AB4496B15CB

_rootPath = [@"~/text.txt" stringByExpandingTildeInPath];
NSLog(@"%@",_rootPath);
打印结果: /var/mobile/Containers/Data/Application/F2D32886-1AEA-49B3-8890-DB534ABE390D/text.txt

• stringByAbbreviatingWithTildeInPath

_rootPath = [@"~/text.txt" stringByExpandingTildeInPath];
_rootPath = [_rootPath stringByAbbreviatingWithTildeInPath];
NSLog(@"%@",_rootPath);
打印结果：~/text.txt

• (nullable NSString *)stringByAppendingPathExtension:(NSString *)str

_rootPath = [@"test" stringByAppendingPathExtension:@"txt"];
NSLog(@"%@",_rootPath);
打印结果：test.txt

• pathExtension

_rootPath = [@"test.txt" pathExtension];
NSLog(@"%@",_rootPath);
打印结果：txt

• (NSString *)stringByAppendingPathComponent:(NSString *)str

_rootPath = [@"test" stringByAppendingPathComponent:@"test2"];
NSLog(@"%@",_rootPath);
打印结果：test/test2