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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 0; }
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 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); }
代码段3：清除缓存功能方法一
1.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];
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原文地址：http://www.cnblogs.com/xjf125/p/5433324.html
