在APP开发中，大量的图片或消息占用系统内存，造成一堆垃圾信息，所以开发清除缓存功能就显得必不可少了。
代码段1：获取文件的大小
- (long long) fileSizeAtPath:(NSString*) filePath{
NSFileManager* manager = [NSFileManager defaultManager];
if ([manager fileExistsAtPath:filePath]){
return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];
}
return ;
}代码段2：获取文件的大小
//遍历文件夹获得文件夹大小，返回多少M
- (float ) folderSizeAtPath:(NSString*) folderPath{
NSFileManager* manager = [NSFileManager defaultManager];
if (![manager fileExistsAtPath:folderPath]) return ;
NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:folderPath] objectEnumerator];
NSString* fileName;
long long folderSize = ;
while ((fileName = [childFilesEnumerator nextObject]) != nil){
NSString* fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];
folderSize += [self fileSizeAtPath:fileAbsolutePath];
}
return folderSize/(1024.0*1024.0);
}
代码段3：清除缓存功能方法一
.清除缓存第一种
- (void)action:(id)sender
{
//彻底清除缓存第一种方法
UIButton * button = sender;
[button setTitle:@"清理完毕" forState:UIControlStateNormal];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSString *path = [paths lastObject];
NSString *str = [NSString stringWithFormat:@"缓存已清除%.1fM", [self folderSizeAtPath:path]];
NSLog(@"%@",str);
NSArray *files = [[NSFileManager defaultManager] subpathsAtPath:path];
for (NSString *p in files) {
NSError *error;
NSString *Path = [path stringByAppendingPathComponent:p];
if ([[NSFileManager defaultManager] fileExistsAtPath:Path]) {
[[NSFileManager defaultManager] removeItemAtPath:Path error:&error];
}
}
}代码段4：清除缓存功能方法二
[[SDImageCache sharedImageCache] clearDisk]; [[SDImageCache sharedImageCache] clearMemory];