iOS 获取沙盒下所有特定文件

-(void)getFileList{

    NSString *string = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];


    NSArray *fileList = [[[NSFileManager defaultManager] contentsOfDirectoryAtPath:string error:nil] pathsMatchingExtensions:@[@"pdf",@"txt",@"plist"]];

}