ios-清理缓存

1，计算缓存

---

-(void)caculateCacheSize{

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

dispatch_async(queue, ^{

_cacheStr = [NSString stringWithFormat:@"%.2fMB",[self folderSizeAtPath]];

if (_cacheStr.length) {

dispatch_sync_on_main_queue(^{

[self.myTableView reloadData];

});

}

});

}

#pragma mark 计算目录大小

- (float)folderSizeAtPath{

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

NSFileManager *fileManager=[NSFileManager defaultManager];

float folderSize = 0;

if ([fileManager fileExistsAtPath: path]) {

NSArray *childerFiles =[fileManager subpathsAtPath: path];

for (NSString *fileName in childerFiles) {

NSString *absolutePath=[path stringByAppendingPathComponent: fileName];

folderSize +=[self fileSizeAtPath: absolutePath];

}

folderSize+=[YYImageCache sharedCache].diskCache.totalCost/1024.0/1024.0;

return fabsf(folderSize);

}

return 0;

}

#pragma mark 计算单个文件的大小

- (float)fileSizeAtPath:(NSString *)path{

NSFileManager *fileManager=[NSFileManager defaultManager];

if([fileManager fileExistsAtPath: path]){

long long size=[fileManager attributesOfItemAtPath: path error: nil].fileSize;

return size/1024.0/1024.0;

}

return 0;

}

2，执行清除缓存操作：

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

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

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

for (NSString *p in files)

{

NSError *error;

NSString *path = [cachPath stringByAppendingPathComponent:p];

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

{

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

}

}

[[YYImageCache sharedCache].diskCache removeAllObjects];