[英]UITableView(with sqlite3) not update
我是韩国人,我的英语很简单
非常非常抱歉
请帮我
我的应用示例电话簿。 带sqlite3 DB的两个视图和选项卡栏
第一个视图是表格视图的单元格列表,有名称的是链接数据库
第二个视图使用SQL查询保存和查找和删除电话簿列表。
我希望secondview保存数据并更改选项卡更新数据列表。
我编码[viewDidAppear] reloadData方法
关闭应用程序,重新打开应用程序更新。
但尚未更新,请更改水龙头T_T,请帮助我。
FirstViewController.h
#import <UIKit/UIKit.h>
#import "sqlite3.h"
@interface FirstViewController : UIViewController <UITableViewDelegate,UITableViewDataSource>
{
NSString *path;
NSString *dbName;
NSString *databasePath;
sqlite3 *contactDB;
}
@property (nonatomic) sqlite3 *contactDB_2;
@property (strong,nonatomic) IBOutlet UITableView *myTable;
@property (nonatomic,retain) NSMutableArray *quizs;
-(void)checkAndCreateDatabase;
-(void)readFromDatabase;
@end
FistViewController.m
#import "FirstViewController.h"
#import "person.h"
@implementation FirstViewController
@synthesize contactDB_2,myTable;
@synthesize quizs;
-(void)checkAndCreateDatabase{
NSFileManager *filemgr = [NSFileManager defaultManager];
if([filemgr fileExistsAtPath:databasePath] == NO){
const char *dbPath = [databasePath UTF8String];
if(sqlite3_open(dbPath,&contactDB) == SQLITE_OK){
char *errMsg;
const char *sql_stmt = "CREATE TABLE IF NOT EXISTS CONTACTS(ID INTEGER PRIMARY KEY AUTOINCREMENT,NAME TEXT,ADRESS TEXT, PHONE TEXT)";
sqlite3_exec(contactDB, sql_stmt, NULL, NULL, &errMsg);
sqlite3_close(contactDB);
}
}
}
-(void)readFromDatabase
{
const char *dbpath = [databasePath UTF8String];
sqlite3_stmt *statement;
if(sqlite3_open(dbpath, &contactDB)==SQLITE_OK)
{
NSString *querySQL = [NSString stringWithFormat:@"SELECT name,phone FROM contacts"];
const char *query_stmt = [querySQL UTF8String];
if(sqlite3_prepare_v2(contactDB, query_stmt, -1, &statement, NULL)==SQLITE_OK)
{
while(sqlite3_step(statement)==SQLITE_ROW){
NSString* nameField = [[NSString alloc]initWithUTF8String:(const char*)sqlite3_column_text(statement, 0)];
NSString* phoneField = [[NSString alloc]initWithUTF8String:(const char*)sqlite3_column_text(statement, 1)];
person *persons = [person alloc];
[persons setName:nameField];
[persons setPhone:phoneField];
[quizs addObject:persons];
}
sqlite3_finalize(statement);
[myTable reloadData];
}
sqlite3_close(contactDB);
}
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
self.title = NSLocalizedString(@"전화번호목록", @"전화번호목록");
self.tabBarItem.image = [UIImage imageNamed:@"first"];
}
return self;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
pragma mark - View lifecycle
- (void)viewDidLoad
{
dbName = @"contacts2.db";
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
databasePath = [documentsDir stringByAppendingPathComponent:dbName];
[self checkAndCreateDatabase];
quizs = [[NSMutableArray alloc] initWithCapacity:100];
[self readFromDatabase];
[super viewDidLoad];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[myTable delegate];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[quizs removeAllObjects];
[self checkAndCreateDatabase];
[self readFromDatabase];
[myTable reloadData];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
-(NSInteger) numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
-(NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return quizs.count;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString* cellIdentifier = @"cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if(cell == nil)
{
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellIdentifier];
}
person *p = [quizs objectAtIndex:indexPath.row];
NSString *str = [[NSString alloc]initWithFormat:@"%@ %@",p.name,p.phone];
cell.textLabel.text = str;
return cell;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSInteger row = indexPath.row;
NSString *temp = [[NSString alloc]initWithFormat:@"%d번쨰꺼 선택해뜸",row+1];
UIAlertView *alert =[[UIAlertView alloc] initWithTitle:@"터치" message:temp delegate:self cancelButtonTitle:nil otherButtonTitles:@"확인", nil];
[alert show];
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
@end
实际上,您不能在后台将数据插入数据库。因此,在插入所有数据之前,您必须保持应用程序处于活动状态。 如果成功保存了所有数据,请在ViewWillAppear中编写reloadData代码。
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