Ios 在推送到另一个viewController时加载

单击collectionview单元格后，当我按下我的detail View控制器时，加载detailview控制器需要时间。 MainViewController.m

-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{

    DetailViewController *objDetailViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"DetailViewController"];
    objDetailViewController.objProduct = [arrList objectAtIndex:indexPath.row];
    [self.navigationController pushViewController:objDetailViewController animated:YES];
}

- (void)viewDidLoad {

    [super viewDidLoad];
    [self setInitialValues];
    [self productDetailAPI];//WS CALL

}

detailViewContentRoller.m

-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{

    DetailViewController *objDetailViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"DetailViewController"];
    objDetailViewController.objProduct = [arrList objectAtIndex:indexPath.row];
    [self.navigationController pushViewController:objDetailViewController animated:YES];
}

- (void)viewDidLoad {

    [super viewDidLoad];
    [self setInitialValues];
    [self productDetailAPI];//WS CALL

}

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API调用是否在主线程上运行？ 您应该在后台线程上进行网络调用，以不阻止UI线程。

如果“productDetilAPI”是一个web请求函数，它将停止UI，如上面的回答所述，因此您应该做的是

[self performSelectorInBackground:@selector(productDetailAPI)
                           withObject:nil];

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希望此帮助

将调用viewDidLoad in DetailViewConteroller.m的操作或函数放入nsoperation或@selector