我有一个将信息插入数据库的视图。此视图在表视图中显示该信息（视图的上半部分用于其他内容）
我有视图控制器的类，一个对象类和一个表视图单元类（这就是我想的，因为图像和文本标签在这里，而实际的数据库信息在视图控制器中）。
这是NSObject类：
// car.h
#import <Foundation/Foundation.h>
@interface Car : NSObject {
NSString *displayedMake;
NSString *displayedModel;
NSString *displayedImage;
}
@property (nonatomic, strong) NSString *displayedMake;
@property (nonatomic, strong) NSString *displayedModel;
@property (nonatomic, strong) NSString *displayedImage;
-(id)initWithName:(NSString *)n description:(NSString *)d url:(NSString *)u;
@end
//car.m
#import "Car.h"
@implementation Car
@synthesize displayedMake, displayedModel, displayedImage;
-(id)initWithName:(NSString *)n description:(NSString *)d url:(NSString *)u {
self.displayedMake = n;
self.displayedModel = d;
self.displayedImage = u;
return self;
}
@end
这是表格视图单元格类：
//DisplayCarsCell.h
#import <UIKit/UIKit.h>
@interface DisplayCarsCell : UITableViewCell
@property (nonatomic, strong) IBOutlet UIImageView *carImage;
@property (nonatomic, strong) IBOutlet UILabel *makeLabel;
@property (nonatomic, strong) IBOutlet UILabel *modelLabel;
@end
//DisplayCarsCell.m
#import "DisplayCarsCell.h"
#import "ViewController.h"
@implementation DisplayCarsCell
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
// Initialization code
}
return self;
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
@end
最后，视图控制器：
//ViewController.h
#import <UIKit/UIKit.h>
#import "/usr/include/sqlite3.h"
@interface ViewController : UIViewController <UITableViewDelegate> {
//NSString *databasePath;
sqlite3 *carsDB;
NSArray *carImages;
NSMutableArray *cars;
}
@property (nonatomic, retain) NSMutableArray *cars;
@property (strong, nonatomic) IBOutlet UILabel *status;
@end
//ViewController.m
#import "ViewController.h"
#import "DisplayCarsCell.h"
#import "Car.h"
@interface ViewController ()
@end
@implementation ViewController
@synthesize cars;
-(NSString *) filePath {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
return [[paths objectAtIndex:0] stringByAppendingPathComponent:@"cars.db"];
}
-(void) openDB {
if (sqlite3_open([[self filePath]UTF8String],&carsDB) != SQLITE_OK){
sqlite3_close(carsDB);
NSAssert(0, @"Database failed to open");
}
else{
NSLog(@"database opened");
}
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
// Opens the database and creates the table if its the first time
[self readCarsFromDatabase];
}
- (void)readCarsFromDatabase
{
// Setup the database object
//sqlite3 *database;
// Init the animals Array
cars = [[NSMutableArray alloc] init];
// Open the database from the users filessytem
[self openDB];
const char *sql_stmt = "CREATE TABLE IF NOT EXISTS apps (name text, id text, image text)";
if (sqlite3_exec(carsDB, sql_stmt, NULL, NULL, NULL) == SQLITE_OK)
{
NSLog(@"create db");
}
//Setup the SQL Statement and compile it for faster access
const char *sqlStatement = "select * from apps";
sqlite3_stmt *compiledStatement;
if(sqlite3_prepare_v2(carsDB, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) {
// Loop through the results and add them to the feeds array
while(sqlite3_step(compiledStatement) == SQLITE_ROW) {
// Read the data from the result row
//image, or first column in table
NSString *displayedImage=[NSString stringWithFormat: @"%s",(const char *)sqlite3_column_text(compiledStatement, 0)];
//name, or second column in table
NSString *displayedMake=[NSString stringWithFormat: @"%s",(const char *)sqlite3_column_text(compiledStatement, 1)];
//model, or third column in table
NSString *displayedModel=[NSString stringWithFormat: @"%s",(const char *)sqlite3_column_text(compiledStatement, 2)];
NSLog(@"%@, %@, %@",displayedImage, displayedMake, displayedModel);
_status.text = displayedMake;
NSLog(@"here");
// Create a new animal object with the data from the database
Car *carObject = [Car alloc];
carObject.displayedImage = [NSString stringWithFormat: @"%s",(const char *)sqlite3_column_text(compiledStatement, 0)];
// Add the animal object to the animals Array
[cars addObject:carObject];
//NSLog(@"%@",displayedImage);
}
}
else
{
printf( "could not prepare statement: %s\n", sqlite3_errmsg(carsDB) );
}
// Release the compiled statement from memory
sqlite3_finalize(compiledStatement);
sqlite3_close(carsDB);
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
#pragma mark Table view data source
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return carImages.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"DisplayCarsCell";
DisplayCarsCell *cell = [tableView
dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[DisplayCarsCell alloc]
initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:CellIdentifier];
}
// Configure the cell...
//UIImage *displayedImage = [UIImage imageNamed:
//[carImage objectAtIndex: [indexPath row]]];
// Car *carObj = [cars objectAtIndex:indexPath.row];
ViewController *viewController = (ViewController *)[[UIApplication sharedApplication] delegate];
Car *car = (Car *)[viewController.cars objectAtIndex:indexPath.row];
//[cell setImage:car.displayedImage];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
// TODO: Select Item
NSLog(@"Selected");}
@end
视图控制器本身显然是从readCarsFromDatabase获取数据数组，并正在viewDidLoad上正确记录数据库的每一行（这样做是为了确保该部分没有错误），但我需要它来更新行内部的表视图。
答案 0 :(得分：0)
完成向reloadData添加记录后，您必须为{1}}调用cars，例如在readCarsFromDatabase结束时。我没有看到IBOutlet的{{1}}，但如果只是UITableView，那么您需要在tableView之后添加一行说明：
sqlite3_close显然，请确保将表视图的委托设置为视图控制器。
另外，我原本会想到视图控制器的[self.tableView reloadData];
中的以下行：
cellForRowAtIndexPath应改为简单地说：
ViewController *viewController = (ViewController *)[[UIApplication sharedApplication] delegate];
Car *car = (Car *)[viewController.cars objectAtIndex:indexPath.row];