iOS工作记录10：清理缓存

我们在做项目开发的时候，经常会遇到设置清理缓存的问题，对于新手经常会考虑到什么数据存储啊，内存之类一大堆无用的想法，其实镔哥认为清理工程的缓存是一件非常简单的事情。

不用多说：见代码，立即大悟：

@property (nonatomic,
strong) UILabel * cachLabel;//显示缓存有多少m
最后节目显示：

cell.cachLabel.text = [NSString
stringWithFormat:@"(%.2fM)", [self
filePath]];

/"直接复杂下面代码就可以用"/正式开始了哦：＝＝＝＝＝＝＝＝＝＝＝＝

//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);

}

//显示缓存大小

- (float)filePath

{

NSString * cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,
NSUserDomainMask, YES)
firstObject];

return [self
folderSizeAtPath:cachPath];

}

//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");

UIAlertView * alertView = [[UIAlertView
alloc] initWithTitle:@"提示"
message:@"缓存清理完毕"
delegate:nil
cancelButtonTitle:@"确定"
otherButtonTitles: nil];

[alertView show];

[_tableView
reloadData];//清理完之后重新导入数据

}

//＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝另外一种写法更简单＝＝＝＝＝＝＝＝＝＝＝＝

清理缓存的代码如下：

dispatch_async(

dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
, ^{

NSString *cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask, YES) objectAtIndex:0];

NSArray *files = [[NSFileManager defaultManager] subpathsAtPath:cachPath];

NSLog(@"files :%d",[files count]);

for (NSString *p in files) {

NSError *error;

NSString *path = [cachPath stringByAppendingPathComponent:p];

if ([[NSFileManager defaultManager] fileExistsAtPath:path])
{

[[NSFileManager defaultManager] removeItemAtPath:path error:&error];

}

}

[self performSelectorOnMainThread:@selector(clearCacheSuccess) withObject:nilwaitUntilDone:YES];});

-(void)clearCacheSuccess

{

NSLog(@"清理成功");

}