app获取缓存、清理缓存

- (void)cleanCachesSize{
    
    
///清理缓存
NSString *cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject];
    NSFileManager *fileManager=[NSFileManager defaultManager];
    if ([fileManager fileExistsAtPath:cachPath]) {
    
    
        NSArray *childerFiles=[fileManager subpathsAtPath:cachPath];
        for (NSString *fileName in childerFiles) {
    
    
            NSString *absolutePath=[cachPath stringByAppendingPathComponent:fileName];
            [fileManager removeItemAtPath:absolutePath error:nil];
        }
    }
}
  - (NSString *)cleanCachesSize{
    
    
    ///获取缓存
    NSString *cachPath = [ NSSearchPathForDirectoriesInDomains ( NSCachesDirectory , NSUserDomainMask , YES ) firstObject ];
    NSFileManager* manager = [NSFileManager defaultManager];
    if (![manager fileExistsAtPath:cachPath]) return 0;
    NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:cachPath] objectEnumerator];
    NSString* fileName;
    long long folderSize = 0;
    while ((fileName = [childFilesEnumerator nextObject]) != nil){
    
    
        NSString* fileAbsolutePath = [cachPath stringByAppendingPathComponent:fileName];
        folderSize += [self fileSizeAtPath:fileAbsolutePath];
    }
    return [self cacheSize:folderSize];
  }
    - (NSString *)cacheSize:(long long)totalSize
    {
    
    
 NSString *sizeStr;
    float sizeGB = totalSize/1024.0/1024.0/1024.0;
    float sizeMB = totalSize/1024.0/1024.0;
    float sizeKB = totalSize/1024.0;
    if (totalSize>1024.0*1024.0*1024.0) {
    
    
        sizeStr = [NSString stringWithFormat:@"%.1ldG",(long)sizeGB];
    }else if (totalSize>1024.0*1024.0) {
    
    
        sizeStr = [NSString stringWithFormat:@"%.1ldM",(long)sizeMB];
    }else if (totalSize>1024.0) {
    
    
        sizeStr = [NSString stringWithFormat:@"%.1ldK",(long)sizeKB];
    }else{
    
    
        sizeStr = [NSString stringWithFormat:@"%.1ldB",(long)totalSize];
    }
    return sizeStr;
    }
    - (long long)fileSizeAtPath:(NSString*)filePath {
    
    
    
    NSFileManager* manager = [NSFileManager defaultManager];
    if ([manager fileExistsAtPath:filePath]){
    
    
        return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];
    }
    return 0;
}