iOS中显示获取缓存的大小多少M，点击清除缓存方法

// 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];


}