Question

我有一个sqlite数据库，我用它填充表视图。每个单元格相应地打开详细视图。在这个详细视图中，我有一些按钮，它们必须打开其他细节视图，（一个是图像视图，一个是地图视图，一个是下载pdf文件），但所有这些都必须根据表视图行显示内容首先选择。我怎样才能做到这一点？感谢名单

TableVC.m

#import "TableVC.h"
#import "DetailPointsVC.h"

@interface TableVC ()

@end

@implementation TableVC {
NSMutableArray *listOfTitle;
NSMutableArray *listOfImages;
}

@synthesize sendDataTable;

- (void)viewDidLoad
{
[super viewDidLoad];
[self initDatabase];
[self getPoints];
}

#pragma mark - View lifecycle

-(void)initDatabase{
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:@"mydb.sqlite"];
success = [fileManager fileExistsAtPath:writableDBPath];
if (success)
{
    return;
}
NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"mydb.sqlite"];
success = [fileManager copyItemAtPath:defaultDBPath toPath:writableDBPath error:&error];
if (!success)
{
    NSAssert1(0, @"Failed to create writable database file with message '%@'.", [error localizedDescription]);
}
 }

-(void)getPoints{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"geositidb.sqlite"];
if (sqlite3_open([path UTF8String], &database) == SQLITE_OK)
{

    const char *sql = "SELECT * FROM pointsofinterest";

    sqlite3_stmt *searchStatement;


    if (sqlite3_prepare_v2(database, sql, -1, &searchStatement, NULL) == SQLITE_OK)
    {

        listOfTitle = [[NSMutableArray alloc] init];
        listOfImages = [[NSMutableArray alloc] init];

        while (sqlite3_step(searchStatement) == SQLITE_ROW)
        {
           NSString *title = [NSString stringWithUTF8String:(char *)sqlite3_column_text(searchStatement, 2)];
            NSString *image = [NSString stringWithUTF8String:(char *)sqlite3_column_text(searchStatement, 10)];

            [listOfTitle addObject:title];
            [listOfImages addObject:image];

        }
    }
    sqlite3_finalize(searchStatement);
}
 }


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return [listOfTitle count];
}

 //Table View cell
 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *simpleTableIdentifier =@"Cell";
UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if(cell == nil){
    cell=[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:simpleTableIdentifier];
}

    cell.textLabel.text = [listOfTitle objectAtIndex:indexPath.row];


return cell;
 }


//Detail View items
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:@"showDetail"]) {
    NSIndexPath *indexPath = [self.sendDataTable indexPathForSelectedRow];
        DetailPointsVC *destViewController = segue.destinationViewController;
 destViewController.dataName = [listOfTitle objectAtIndex:indexPath.row];
 destViewController.dataImage = [listOfImages objectAtIndex:indexPath.row];



}
}

 @end

DetailPointsVC.h

@interface DetailPointsVC : UIViewController
 //UILabel
@property (nonatomic, strong) IBOutlet UILabel *dataLabel;
@property (nonatomic, strong) NSString *dataName;
//UIImageView
 @property (weak, nonatomic) IBOutlet UIImageView *dataImageView;
 @property (nonatomic, strong) NSString *dataImage;

DetailPointsVC.m

 @interface DetailPointsVC ()

 @end

 @implementation DetailPointsVC
 @synthesize dataLabel;
 @synthesize dataName;
 @synthesize dataImageView;
 @synthesize dataImage;
- (void)viewDidLoad {
[super viewDidLoad];
self.dataLabel.text = dataName;
self.dataImageView.image = [UIImage imageNamed:dataImage];
 }
@end

此详细视图上的按钮会打开另一个应显示图像的视图

Answer 1

所以，基本上你有以下视图控制器：

List ---> Detail ----> Image
                  |
                  |--> Map
                  |
                  ---> PDF

您可以在“List”的prepareForSegue:方法中将所需的详细信息传递给“详细信息”，并在单击按钮时将它们传递给下一个视图控制器。例如：

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"showImage"]) {
        DetailImageVC *destViewController = segue.destinationViewController;
        destViewController.dataImage = self.dataImage;
    }
}

详细信息视图按钮根据sqlite db

1 个答案: