iOS--storyBoard使用Block传值

//点击cell跳转时触发
// In a storyboard-based application, you will often want to do a little preparation before navigation

在使用storyBoard时进行传值是的操作.

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    //得到目的视图
    DetailViewController * detailVC = [segue destinationViewController];
    //得到点击的cell
    ContactTableViewCell * cell = sender;
    //得到索引值
    NSIndexPath * indexPath = [self.tableView indexPathForCell:cell];
    //传值.
    detailVC.string = [self.MArray objectAtIndex:indexPath.row];
    __weak ContactTableViewCell *cellTwo = cell;
    __weak DetailViewController *detailTwoVC = detailVC;
    [detailTwoVC showTFStringBlock:^(NSString *str) {
        //给cell赋值.
        cellTwo.aLabel.text = str;
        //在MRC下用__BLock解决循环引用问题防止引用计数加1, 在ARC环境下用__weak解决循环引用问题,防止cell,detailVC所持有的对象引用计数加一.
        detailTwoVC.view.backgroundColor = [UIColor redColor];
    }];
}

iOS--storyBoard使用Block传值

原文：http://www.cnblogs.com/jfhn/p/4442939.html