清理APP缓存

清理缓存

主要是删除/Caches目录下的内容.如果其他路径上的文件可以删除也可以包含进来.

iOS 文件系统也得了解一下
iOS 文件系统

+ (NSUInteger)getCachesSize {
    NSUInteger size = 0;
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
    NSDirectoryEnumerator *fileEnumerator = [fileManager enumeratorAtPath:cachePath]; //枚举指定目录的所有文件包括文件夹.
    for (NSString *fileName in fileEnumerator) {
        if ([fileName isEqualToString:@"Snapshots"]) {  //"/Snapshots"是系统生成的,删了也会再自动创建,所以就不计算了.
            continue;
        }
        NSString *filePath = [cachePath stringByAppendingPathComponent:fileName];
        NSDictionary *attrs = [fileManager attributesOfItemAtPath:filePath error:nil];
//        NSLog(@"fileType:%@, fileName:%@", [attrs objectForKey:NSFileType], fileName);
//        NSLog(@"filePath:%@", filePath);
        size += [attrs fileSize];
    }
    return size;
}

+ (void)clearCachesWithCompletionHandler:(void(^)(void))completionHandler {
    
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        NSFileManager *fileManager = [NSFileManager defaultManager];
        NSString * cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
        NSDirectoryEnumerator *fileEnumerator = [fileManager enumeratorAtPath:cachePath];
        for (NSString *fileName in fileEnumerator) {
            if ([fileName isEqualToString:@"Snapshots"]) {
                continue;
            }
            NSString *filePath = [cachePath stringByAppendingPathComponent:fileName];
            BOOL removeRs = [fileManager removeItemAtPath:filePath error:nil];
            if (!removeRs) {
                NSDictionary *attrs = [fileManager attributesOfItemAtPath:filePath error:nil];
                DLog(@"移除文件失败:fileType:%@, fileName:%@", [attrs objectForKey:NSFileType], fileName);
            }
        }
        
        dispatch_async(dispatch_get_main_queue(), ^{
            if (completionHandler) {
                completionHandler();
            }
        });
    });
}

/Library/Caches/Snapshots/com.AppName/UIApplicationAutomaticSnapshotDefault-LandscapeLeft.png
“/Snapshots”该目录保存的是按下home键时系统对当前屏幕生成的一张快照.

参考:IOS BACKGROUND SCREEN CACHING

- (BOOL)removeItemAtPath:(NSString *)path error:(NSError * _Nullable *)error;会移除文件或目录