iOS ---清除缓存
[self clearCache];
#pragma mark - 点击事件
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex) {
//点击了确定,遍历整个caches文件,将里面的缓存清空
NSString *path = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
NSFileManager *fileManager=[NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:path]) {
NSArray *childerFiles=[fileManager subpathsAtPath:path];
for (NSString *fileName in childerFiles) {
//如有需要，加入条件，过滤掉不想删除的文件
NSString *absolutePath=[path stringByAppendingPathComponent:fileName];
[fileManager removeItemAtPath:absolutePath error:nil];
}
//清理缓存
[[SDImageCache sharedImageCache] cleanDisk];
}
}
self.alertView = nil;
}
#pragma mark - 清理缓存
- (void)clearCache{
NSString *path = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
NSFileManager *fileManager=[NSFileManager defaultManager];
float folderSize;
if ([fileManager fileExistsAtPath:path]) {
//拿到算有文件的数组
NSArray *childerFiles = [fileManager subpathsAtPath:path];
//拿到每个文件的名字,如有有不想清除的文件就在这里判断
for (NSString *fileName in childerFiles) {
//将路径拼接到一起
NSString *fullPath = [path stringByAppendingPathComponent:fileName];
folderSize += [self fileSizeAtPath:fullPath];
}
// NSLog(@" 缓存文件大小 %f ",folderSize);
self.alertView = [[UIAlertView alloc] initWithTitle:@"清理缓存" message:[NSString stringWithFormat:@"缓存大小为%.2fM,确定要清理缓存吗?", folderSize] delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];
[self.alertView show];
self.alertView.delegate = self;
}
}
#pragma mark - 计算单个文件夹的大小
-(float)fileSizeAtPath:(NSString *)path{
NSFileManager *fileManager=[NSFileManager defaultManager];
if([fileManager fileExistsAtPath:path]){
long long size=[fileManager attributesOfItemAtPath:path error:nil].fileSize;
//SDWebImage框架自身计算缓存的实现
size+=[[SDImageCache sharedImageCache] getSize];
return size/1024.0/1024.0;
}
return 0;
}