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我是 IOS 应用程序编程的新手——我学习了iOS 第二个应用程序教程（观鸟教程），当我到最后时遇到了 2 个问题，任何指针都将不胜感激。

  1. 主视图上的 + 按钮消失了，我不明白为什么？代码的哪一部分控制这个？

  2. 在主视图中选择鸽子鸟时，会出现详细视图，但所有项目中仍然有详细信息，因此鸟名仍然是详细信息，位置仍然是详细信息等。

任何帮助将不胜感激。

谢谢

编辑 - 为 masterviewcontroller 添加了 .h 和 .m 代码

。H

#import <UIKit/UIKit.h>
@class BirdSightingDataController;
@interface BirdsMasterViewController : UITableViewController
@property (strong, nonatomic) BirdSightingDataController *dataController;
- (IBAction)done:(UIStoryboardSegue *)segue;
- (IBAction)cancel:(UIStoryboardSegue *)segue;
@end

.m

#import "BirdsMasterViewController.h"

#import "BirdsDetailViewController.h"
#import "BirdSightingDataController.h"
#import "BirdSighting.h"
#import "AddSightingViewController.h"

@implementation BirdsMasterViewController

- (void)awakeFromNib
{
    [super awakeFromNib];
    self.dataController = [[BirdSightingDataController alloc] init];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.navigationItem.rightBarButtonItem.accessibilityHint = @"Adds a new bird sighting event";
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table View

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return [self.dataController countOfList];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *CellIdentifier = @"BirdSightingCell";

    static NSDateFormatter *formatter = nil;
    if (formatter == nil) {
        formatter = [[NSDateFormatter alloc] init];
        [formatter setDateStyle:NSDateFormatterMediumStyle];
    }
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    BirdSighting *sightingAtIndex = [self.dataController objectInListAtIndex:indexPath.row];
    [[cell textLabel] setText:sightingAtIndex.name];
    [[cell detailTextLabel] setText:[formatter stringFromDate:(NSDate *)sightingAtIndex.date]];
    return cell;
}

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the specified item to be editable.
    return NO;
}

- (IBAction)done:(UIStoryboardSegue *)segue
{
    if ([[segue identifier] isEqualToString:@"ReturnInput"]) {

        AddSightingViewController *addController = [segue sourceViewController];
        if (addController.birdSighting) {
            [self.dataController addBirdSightingWithSighting:addController.birdSighting];
            [[self tableView] reloadData];
        }
        [self dismissViewControllerAnimated:YES completion:NULL];
    }
}
- (IBAction)cancel:(UIStoryboardSegue *)segue
{
    if ([[segue identifier] isEqualToString:@"CancelInput"]) {
        [self dismissViewControllerAnimated:YES completion:NULL];
    }
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([[segue identifier] isEqualToString:@"ShowSightingDetails"]) {
        BirdsDetailViewController *detailViewController = [segue destinationViewController];

        detailViewController.sighting = [self.dataController objectInListAtIndex:[self.tableView indexPathForSelectedRow].row];
    }
}

@end
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