SDWebImage 獲取緩存大小

//獲取緩存的大小

NSUInteger intg = [[SDImageCache sharedImageCache] getSize];
//
NSString * currentVolum = [NSString stringWithFormat:@"%@",[self fileSizeWithInterge:intg]];

//計算出大小
- (NSString *)fileSizeWithInterge:(NSInteger)size{
    // 1k = 1024, 1m = 1024k
    if (size < 1024) {// 小於1k
        return [NSString stringWithFormat:@"%ldB",(long)size];
    }else if (size < 1024 * 1024){// 小於1m
        CGFloat aFloat = size/1024;
        return [NSString stringWithFormat:@"%.0fK",aFloat];
    }else if (size < 1024 * 1024 * 1024){// 小於1G
        CGFloat aFloat = size/(1024 * 1024);
        return [NSString stringWithFormat:@"%.1fM",aFloat];
    }else{
        CGFloat aFloat = size/(1024*1024*1024);
        return [NSString stringWithFormat:@"%.1fG",aFloat];
    }
}