如何以编程方式使UITableView滚动到特定部分 [英] How to programmatically have UITableView scroll to a specific section

问题描述

在我的日历应用程序中，我希望UITableView可以根据所点击的日期滚动到特定部分.当前实现如下:

In my calendar app, I want my UITableView to scroll to a specific section based on which date is tapped. Current implementation is below:

- (void)calendarDidDateSelected:(JTCalendar *)calendar date:(NSDate *)date
{
    // Format NSDate so it can be compared to date selected
    static NSDateFormatter *dateFormatter = nil;
    if(!dateFormatter){
        dateFormatter = [NSDateFormatter new];
        dateFormatter.dateFormat = @"yyyy-MM-dd"; // Read the documentation for dateFormat
    }

    // Set formatted dates
    NSDate *juneSixteenth = [dateFormatter dateFromString:@"2015-06-16"];
    NSDate *juneSeventeenth = [dateFormatter dateFromString:@"2015-06-17"];

    // Set date selected, so agendaTable knows which event to show
    if([juneSixteenth compare:date] == NSOrderedSame){
        NSLog(@"You picked June 16th");
        self.datePicked = [NSNumber numberWithInt:16];
    }
    else if([juneSeventeenth compare:date] == NSOrderedSame){
        NSLog(@"You picked June 17th");
        self.datePicked = [NSNumber numberWithInt:17];
    }
    else {
        _datePicked = nil;
        NSLog(@"Date: %@", date);
    }
    [self.agendaTable reloadData];
}

我发现了一个类似的问题，说可以做到这一点所以:

I found a similar question that says to do it like so:

       if([juneSixteenth compare:date] == NSOrderedSame){
            NSLog(@"You picked June 16th");
            self.datePicked = [NSNumber numberWithInt:16];

            //"row" below is row selected in the picker view
            NSIndexPath *ip = [NSIndexPath indexPathForRow:0 inSection:row];

            [self.agendaTable scrollToRowAtIndexPath:ip
                          atScrollPosition:UITableViewScrollPositionNone
                                  animated:YES];
        }

这给出了一个错误，指出row是一个未声明的标识符，并且我希望它始终使用节索引而不是行.我将如何实施呢?

This gives an error stating that row is an undeclared identifier, and I want it to use the section index rather than the row anyway. How would I implement this?

推荐答案

尝试一下

[NSIndexPath indexPathForRow:NSNotFound inSection:section]

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