如何从iPhone的文档目录中删除超过两天以上的文件

Question

我有一个应用程序，在该应用程序中录制声音文件并将其存储在应用程序文档目录中。

我想要的是，它应该只包含昨天和旧天文件，并从iPhone应用程序的文件夹中删除所有其他人。有没有办法做到这一点？

谢谢..

Answer 1

请看下面的代码。

//Get the Document directory path. 
#define kDOCSFOLDER [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] 

//Delete files by iterating items of the folder. 
NSFileManager* fm = [[[NSFileManager alloc] init] autorelease]; 
NSDirectoryEnumerator* en = [fm enumeratorAtPath:kDOCSFOLDER];  
NSError* err = nil; 
BOOL res; 

NSString* file; 
while (file = [en nextObject]) { 
      // Date comparison. 
    NSDate *creationDate = [[fm attributesOfItemAtPath:file error:nil] fileCreationDate]; 
    NSDate *yesterDay = [[NSDate date] dateByAddingTimeInterval:(-1*24*60*60)]; 

    if ([creationDate compare:yesterDay] == NSOrderedAscending) 
    { 
     // creation date is before the Yesterday date 
     res = [fm removeItemAtPath:[kDOCSFOLDER stringByAppendingPathComponent:file] error:&err]; 

     if (!res && err) { 
      NSLog(@"oops: %@", err); 
     } 

    } 

} 

Answer 2

如果你会搜索你很少会得到这个：

[fileManager removeItemAtPath: fullPath error:NULL]; 

所以你可以使用这样的事情让你的文件的创建日期：

NSFileManager* fileManager = [NSFileManager defaultManager]; 
NSDictionary* dict = [fileManager attributesOfItemAtPath:filePath error:nil]; 
NSDate *date = (NSDate*)[dict objectForKey: NSFileCreationDate]; 

在if条件中比较这些日期并删除这些文件。

更新1：工作代码删除超过两天的文件。

// Code to delete images older than two days. 
    #define kDOCSFOLDER [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] 

NSFileManager* fileManager = [[[NSFileManager alloc] init] autorelease]; 
NSDirectoryEnumerator* en = [fileManager enumeratorAtPath:kDOCSFOLDER];  

NSString* file; 
while (file = [en nextObject]) 
{ 
    NSLog(@"File To Delete : %@",file); 
    NSError *error= nil; 

    NSString *filepath=[NSString stringWithFormat:[kDOCSFOLDER stringByAppendingString:@"/%@"],file]; 


    NSDate *creationDate =[[fileManager attributesOfItemAtPath:filepath error:nil] fileCreationDate]; 
    NSDate *d =[[NSDate date] dateByAddingTimeInterval:-2*24*60*60]; 

    NSDateFormatter *df=[[NSDateFormatter alloc]init];// = [NSDateFormatter initWithDateFormat:@"yyyy-MM-dd"]; 
    [df setDateFormat:@"EEEE d"]; 

    NSString *createdDate = [df stringFromDate:creationDate]; 

    NSString *twoDaysOld = [df stringFromDate:d]; 

    NSLog(@"create Date----->%@, two days before date ----> %@", createdDate, twoDaysOld); 

    // if ([[dictAtt valueForKey:NSFileCreationDate] compare:d] == NSOrderedAscending) 
    if ([creationDate compare:d] == NSOrderedAscending) 

    { 
     if([file isEqualToString:@"RDRProject.sqlite"]) 
     { 

      NSLog(@"Imp Do not delete"); 
     } 

     else 
     { 
      [[NSFileManager defaultManager] removeItemAtPath:[kDOCSFOLDER stringByAppendingPathComponent:file] error:&error]; 
     } 
    } 
} 

Answer 3

请检查下面的代码：

NSArray *dirContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] error:nil]; 
for (NSString *file in dirContents) { 
    NSError *error= nil; 
    NSDictionary *dictAtt = [[NSFileManager defaultManager] attributesOfItemAtPath:/*file path*/ error:&error]; 

    NSDate *d =[[NSDate date] dateByAddingTimeInterval:-86400]; 
    if ([[dictAtt valueForKey:NSFileCreationDate] compare:d] == NSOrderedAscending) { 
     [[NSFileManager defaultManager] removeItemAtPath:/*file path*/ error:&error]; 
    } 
}