iOS清除缓存功能开发

　　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];