NSPredicate以多个文件结尾

Question

我试图使用谓词检查以一组扩展名结尾的文件来过滤数组.我怎么能这样做？

接近'自我结束在%@'的工作会有效吗？谢谢!

NSArray * dirContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsDirectoryPath error:nil];
NSArray * files = [dirContents filteredArrayUsingPredicate:
    [NSPredicate predicateWithFormat:@"self CONTAINS %@",
    [NSArray arrayWithObjects:@".mp4", @".mov", @".m4v", @".pdf", @".doc", @".xls", nil]
    ]];

Answer 1

你不想要数组的包含,你想要的.理想情况下你也希望按路径扩展名进行过滤.所以

NSArray *extensions = [NSArray arrayWithObjects:@"mp4", @"mov", @"m4v", @"pdf", @"doc", @"xls", nil];
NSArray *dirContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsDirectoryPath error:nil];
NSArray *files = [dirContents filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"pathExtension IN %@", extensions]];