Segue还是didSelectRowAtIndexPath？ [英] To Segue or to didSelectRowAtIndexPath?

问题描述

以下是我目前正在运行的代码。我有一个故事板设置与导航控制器和tableview控制器和视图控制器。我试图将我为表格设置的NSDictionary中的名称传递给详细视图控制器。我应该使用prepareforsegue或didselectrowatindexpath吗？如何从字典中取出名称以传递它？

Below is the code that I am currently running. I have a storyboard setup with a nav controller and tableview controller and a view controller. I am trying to pass the name from the NSDictionary that I have setup for the Table to the detail view controller. Should I use prepareforsegue or didselectrowatindexpath and how would I get the name out of the dictionary to pass it along?

#import "FMInboxViewController.h"
#import "FMDetailViewController.h"

@interface FMInboxViewController ()

@end

@implementation FMInboxViewController

@synthesize keyArray;
@synthesize tableArray;
@synthesize tblDictionary;
@synthesize filteredArray;

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSMutableArray *ary=[[NSMutableArray alloc]init];
    [ary addObject:@"Adam"];
    [ary addObject:@"Fred"];
    [ary addObject:@"Angel"];
    // ... many similar entries
    [ary addObject:@"James"];
    [ary addObject:@"Mukthesh"];

    self.tblDictionary =[self fillingDictionary:ary];
}

表格查看数据来源

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return [keyArray count];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    NSArray *ary = [self.tblDictionary valueForKey:[keyArray objectAtIndex:section]];
    return [ary count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    NSString *key = [keyArray objectAtIndex:[indexPath section]];
    NSArray *array = (NSArray *)[self.tblDictionary valueForKey:key];
    NSString *cellTitle = [array objectAtIndex:[indexPath row]];
    cell.textLabel.text = cellTitle;

    // Configure the cell...

    return cell;
}

-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
    NSString *title = [keyArray objectAtIndex:section];
    return title;
}

//-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
//    NSString *key = [keyArray objectAtIndex:[indexPath section]];
//    NSArray *array = (NSArray *)[self.tblDictionary valueForKey:key];
//    self.selectedName = [array objectAtIndex:indexPath.row];
//    NSLog(@"Selected Name in Did select: %@", self.selectedName);
//    
//    [self performSegueWithIdentifier:@"showDetail" sender:self];
//}

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"showDetail"]) {
        NSIndexPath *section = [self.tableView indexPathForSelectedRow];
        NSString *key = [keyArray objectAtIndex:section];
        NSArray *array = (NSArray *)[self.tblDictionary valueForKey:key];
        NSString *cellTitle = [array objectAtIndex:[indexPath row]];
        NSLog(@"Selected Name in Did select: %@", self.selectedName);
    }
}

帮手方法

#pragma mark - Helper Methods

- (NSMutableDictionary *)fillingDictionary:(NSMutableArray *)sentArray {
    keyArray = [[NSMutableArray alloc] init];
    [keyArray removeAllObjects];
    NSMutableDictionary *dic = [[NSMutableDictionary alloc] init];
    [sentArray sortUsingSelector:@selector(compare:)];
    for ( NSString *str in sentArray) {
        NSString *charVal = [str substringToIndex:1];
        NSString *charStr = [NSString stringWithString:charVal];
        NSLog(@" charStr = %@", charStr);
        if (![keyArray containsObject:charStr]) {
            NSMutableArray *charArray = [[NSMutableArray alloc] init];
            [charArray addObject:str];
            [keyArray addObject:charStr];
            [dic setValue:charArray forKey:charStr];
        }
        else {
            NSMutableArray *prevArray = (NSMutableArray *)[dic valueForKey:charStr];
            [prevArray addObject:str];
            [dic setValue:prevArray forKeyPath:charStr];
        }
    }

    return dic;
}


@end

好的，我将该部分更改为这样

OK, I changed that section to look like this

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    NSString *key = [keyArray objectAtIndex:[indexPath section]];
    NSArray *array = (NSArray *)[self.tblDictionary valueForKey:key];
    self.selectedName = [array objectAtIndex:indexPath.row];
    NSLog(@"Selected Name in Did select: %@", self.selectedName);
}

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    FMDetailViewController *dvc = (FMDetailViewController *)segue.destinationViewController;
    dvc.name = self.selectedName;
}

但是现在当我选择行时，名称将不会显示在详细信息中控制器在第一次按下。如果您返回并选择其他名称，则您按下的第一个名称将显示在视图控制器中。有关为何发生这种情况的任何建议？

However now when I select row the name won't show up in the detail controller on the first press. If you go back and select another name the first name that you pressed then shows up in the view controller. Any suggestions on why this occurs?

推荐答案

您需要在 didSelectRowAtIndexPath 你应该打电话给 [self performSegueWithIdentifier：@identifiersender：self];

You need to use both, in didSelectRowAtIndexPath you should call [self performSegueWithIdentifier:@"identifier" sender:self];

同样View Controller你应该有 prepareForSegue 方法从segue中获取 destinationViewController ，然后在该视图上设置任何属性你想设置的控制器。

In the same View Controller you should have the prepareForSegue method grab the destinationViewController out of the segue, and then set whatever properties on that view controller that you wish to set.

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    self.someProperty = [self.someArray objectAtIndex:indexPath.row];
    [self performSegueWithIdentifier:@"segueID" sender:self];
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    UIViewController *vcToPushTo = segue.destinationViewController;
    vcToPushTo.propertyToSet = self.someProperty;
}

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