http://blog.csdn.net/jymn_chen/article/details/21281019

http://m.blog.csdn.net/article/details?id=51265014

将所有文件存入数组

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

NSFileManager *fileManager = [NSFileManager defaultManager];

NSArray *tempFileList = [[NSArray alloc] initWithArray:[fileManager contentsOfDirectoryAtPath:string error:nil]];

移除所有文件

NSString *DocumentsPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];

NSDirectoryEnumerator *enumerator = [[NSFileManager defaultManager] enumeratorAtPath:DocumentsPath];

for (NSString *fileName in enumerator) {

[[NSFileManager defaultManager] removeItemAtPath:[DocumentsPath stringByAppendingPathComponent:fileName] error:nil];

}

移除所有png文件

NSString *extension = @"png";

NSFileManager *fileManager = [NSFileManager defaultManager];

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentsDirectory = [paths objectAtIndex:0];

NSArray *contents = [fileManager contentsOfDirectoryAtPath:documentsDirectory error:nil];

NSEnumerator *enumerator = [contents objectEnumerator];

NSString *filename;

while ((filename = [enumerator nextObject])) {

if ([[filename pathExtension] isEqualToString:extension]) {

[fileManager removeItemAtPath:[documentsDirectory stringByAppendingPathComponent:filename] error:nil];

}

}