collectionView itemW宽度计算不对

([[UIScreen mainScreen] bounds].size.width - 28) / 4.00 没加括号

collectioView不能正常撑开

用flowLayout 不要用 代理方法!!!!

NMFourCollectFloatLayout *flow = [[NMFourCollectFloatLayout alloc]init];
    flow.itemSize = CGSizeMake((kScreen_Width - 30) / 4.00, 105);
    flow.minimumInteritemSpacing = 0;

下面的不行

//- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
//    NSInteger count = self.dataSource.count > 0 ? self.dataSource.count : 1;
//    
//    CGFloat width = ([[UIScreen mainScreen] bounds].size.width - 50) / 4.00; // 25 30 60可以
//    DZLog(@"width-%f,--%d,--%f",width,count, collectionView.width); // width-97.5 换行 97.250000  96.500000 96
//    return CGSizeMake(width, 105);
//}