简单的清除缓存功能

来源:互联网 时间:2017-01-22


向大家介绍下,自己写得简单地清除缓存功能,可能会有些用,可以帮助大家, 那样我是最开心的.也可能还有很多缺陷问题,希望大家给些建议.让我改正,我同样开心


首先创建一个UIAlertController,来显示缓存大小,还有是否清除



8F65C9B2-172D-4E63-BEE4-1753602F71ED.png
// 创建UIAlertController
- (void)createAlertController
{
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示信息" message:@"是否清除缓存" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *actionCancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
UIAlertAction *actionOk = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[self ClearCache];
}];
[alertController addAction:actionCancel];
[alertController addAction:actionOk];
[self presentViewController:alertController animated:YES completion:nil];
}

下面就是计算缓存的内容


// 计算清除的缓存
- (void)CalculateCache
{
//找到缓存路径
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSString *path = [paths lastObject];
//folderSizeAtPath这个方法是遍历文件夹获得文件夹大小,下面封装的.
float size = [self folderSizeAtPath:path];
self.strOfCache = [NSString stringWithFormat:@"缓存:%.1fM", size];
[self.tableView reloadData];
}
// 遍历文件夹获得文件夹大小, 返回多少m
- (float) folderSizeAtPath:(NSString *)folderPath
{
//创建文件管理对象,
NSFileManager *manager = [NSFileManager defaultManager];
// 判断路径是否存在
if (![manager fileExistsAtPath:folderPath])
{
return 0;
}
else
{
NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:folderPath] objectEnumerator];
NSString *fileName;
// 用来累加缓存的folderSize
long long folderSize = 0;
while ((fileName = [childFilesEnumerator nextObject]) != nil)
{
NSString *fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];
//fileSizeAtPath方法是计算单个文件的大小, 下面封装
folderSize += [self fileSizeAtPath:fileAbsolutePath];
}
return folderSize / (1024.0 * 1024.0);
}
}
// 计算单个文件的大小
- (long long)fileSizeAtPath:(NSString *)filePath
{
NSFileManager *manager = [NSFileManager defaultManager];
if ([manager fileExistsAtPath:filePath]) {
return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];
}else{
return 0;
}
}
// 清除缓存
- (void)ClearCache
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSString *path = [paths lastObject];
NSArray *files = [[NSFileManager defaultManager] subpathsAtPath:path];
//遍历清除每个文件缓存
for (NSString *p in files)
{
NSError *error;
NSString *Path = [path stringByAppendingPathComponent:p];
if ([[NSFileManager defaultManager] fileExistsAtPath:Path])
{
[[NSFileManager defaultManager] removeItemAtPath:Path error:&error];
}
}
//重写计算缓存
[self CalculateCache];
}



相关阅读:
Top