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");
}
原文地址：http://blog.csdn.net/sammyieveo/article/details/41513865
