清理缓存的 方式
// 显示缓存大小
-( float )filePath
{
NSString * cachPath = [ NSSearchPathForDirectoriesInDomains ( NSCachesDirectory , NSUserDomainMask , YES ) firstObject ];
return [ self folderSizeAtPath :cachPath];
}
//1:首先我们计算一下 单个文件的大小
- ( long long ) fileSizeAtPath:( NSString *) filePath{
NSFileManager * manager = [ NSFileManager defaultManager ];
if ([manager fileExistsAtPath :filePath]){
return [[manager attributesOfItemAtPath :filePath error : nil ] fileSize ];
}
return 0 ;
}
//2:遍历文件夹获得文件夹大小，返回多少 M（提示：你可以在工程界设置（)m）
- ( float ) folderSizeAtPath:( NSString *) folderPath{
NSFileManager * manager = [ NSFileManager defaultManager ];
if (![manager fileExistsAtPath :folderPath]) return 0 ;
NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath :folderPath] objectEnumerator ];
NSString * fileName;
long long folderSize = 0 ;
while ((fileName = [childFilesEnumerator nextObject ]) != nil ){
NSString * fileAbsolutePath = [folderPath stringByAppendingPathComponent :fileName];
folderSize += [ self fileSizeAtPath :fileAbsolutePath];
}
return folderSize/( 1024.0 * 1024.0 );
}
// 清理缓存
- (void)clearFile
{
NSString * cachPath = [ NSSearchPathForDirectoriesInDomains ( NSCachesDirectory , NSUserDomainMask ,YES ) firstObject ];
NSArray * files = [[ NSFileManager defaultManager ] subpathsAtPath :cachPath];
NSLog ( @"cachpath = %@" , cachPath);
for ( NSString * p in files) {
NSError * error = nil ;
NSString * path = [cachPath stringByAppendingPathComponent :p];
if ([[ NSFileManager defaultManager ] fileExistsAtPath :path]) {
[[ NSFileManager defaultManager ] removeItemAtPath :path error :&error];
}
}
[ self performSelectorOnMainThread : @selector (clearCachSuccess) withObject : nil waitUntilDone : YES ];
}
-(void)clearCachSuccess
{
NSLog ( @" 清理成功 " );
NSIndexPath *index=[NSIndexPath indexPathForRow:0 inSection:0];//刷新
[_tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:index,nil] withRowAnimation:UITableViewRowAnimationNone];
}
