iOS 计算缓存大小

-(NSString *)getCacheSize

{

float totalSize = 0;

NSString * cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0];

NSString * ImageCache= [cachPath stringByAppendingString:@"/ImageCache"];

NSArray *files = [[NSFileManager defaultManager] subpathsAtPath:ImageCache];

NSLog(@"files :%ld",[files count]);

for (NSString *p in files) {

NSString *path = [ImageCache stringByAppendingPathComponent:p];

if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {

NSDictionary *attrs = [[NSFileManager defaultManager] attributesOfItemAtPath:path error:nil];

unsigned long long length = [attrs fileSize];

            totalSize += length / 1024.0 / 1024.0;

        }

//    NSLog(@"tmp size is %.2f",totalSize);

    }

NSString  *  cacheSizeString    =   [NSString stringWithFormat:@"%0.2fk",totalSize];

return cacheSizeString;

}