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我注意到在我的应用程序中，我正在做。当我注册一个用户名，例如“用户名”，当我尝试用“用户名”登录时，它不让我进入，但当我尝试“用户名”时它确实如此。任何人都可以告诉我如何解决它？这是我的代码。 注册：如何制作不区分大小写的字段。 SQLite
#import "ViewController2.h"
@interface ViewController2()
@end
@implementation ViewController2
@synthesize tbPassword,tbRepass,tbUsername;
-(void) createTable: (NSString *) UserTable
withUserField: (NSString *) UserField
withPassField: (NSString *) PassField;
{
char *err;
NSString *sql = [NSString stringWithFormat:@"CREATE TABLE IF NOT EXISTS '%@' ('%@' " "TEXT PRIMARY KEY, '%@' TEXT);", UserTable, UserField,PassField];
if (sqlite3_exec(users, [sql UTF8String], NULL, NULL, &err)!=SQLITE_OK) {
sqlite3_close(users);
NSAssert(0, @"Could not create table");
}
else{
NSLog(@"table created");
}
}
-(NSString *) filePath {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
return [[paths objectAtIndex:0] stringByAppendingPathComponent:@"users.sql"];
}
-(void) openDB {
if (sqlite3_open([[self filePath]UTF8String],&users) != SQLITE_OK){
sqlite3_close(users);
NSAssert(0, @"Database failed to open");
}
else{
NSLog(@"database opened");
}
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[self openDB];
[self createTable:@"UserAccount" withUserField:@"Username" withPassField:@"Password"];
self.tbUsername.delegate=self;
self.tbPassword.delegate=self;
self.tbRepass.delegate=self;
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)btnRegister:(id)sender
{
NSString *select = [NSString stringWithFormat:@"SELECT * FROM UserAccount WHERE Username = '%s'",[tbUsername.text UTF8String]];
sqlite3_stmt *statement;
if (sqlite3_prepare(users, [select UTF8String], -1, &statement, nil)==SQLITE_OK)
{
if(sqlite3_step(statement)==SQLITE_ROW)
{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Error" message:@"Username already exist!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
}
else
{
if ([tbUsername.text isEqualToString:@""])
{
UIAlertView *alert2 = [[UIAlertView alloc]initWithTitle:@"Error" message:@"Please enter a username." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert2 show];
}
else if([tbPassword.text length]==0 || [tbRepass.text length]==0)
{
UIAlertView *alert3 = [[UIAlertView alloc]initWithTitle:@"Error" message:@"Please enter a password." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert3 show];
}
else if([tbPassword.text length]>0 && [tbRepass.text length]>0)
{
if([tbPassword.text isEqualToString:tbRepass.text])
{
NSLog(@"Password Match");
NSString *username = tbUsername.text;
NSString *pass = tbPassword.text;
NSString *sql = [NSString stringWithFormat:@"INSERT INTO UserAccount ('Username','Password') VALUES ('%@','%@')",username,pass];
char *err;
if (sqlite3_exec(users, [sql UTF8String], NULL, NULL, &err)!=SQLITE_OK)
{
sqlite3_close(users);
NSAssert(0, @"Could not update table)");
}
else
{
NSLog(@"table updated");
UIAlertView *alert4 = [[UIAlertView alloc]initWithTitle:@"Done" message:@"Account was registered successfully!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert4 show];
ViewController *VC = [self.storyboard instantiateViewControllerWithIdentifier:@"ViewController"];
VC.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentViewController:VC animated:YES completion:nil];
tbUsername.text = @"";
tbPassword.text = @"";
}
}
else
{
UIAlertView *alert5 = [[UIAlertView alloc]initWithTitle:@"Error" message:@"Password does not match." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert5 show];
}
}
}
}
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[super touchesBegan:touches withEvent:event];
[[self tbUsername]resignFirstResponder];
[[self tbPassword]resignFirstResponder];
[[self tbRepass]resignFirstResponder];
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
return [textField resignFirstResponder];
}
@end
登录：
#import "ViewController.h"
@interface ViewController()
@end
@implementation ViewController
@synthesize tbPassword,tbUsername;
-(void) createTable: (NSString *) UserTable
withUserField: (NSString *) UserField
withPassField: (NSString *) PassField;
{
char *err;
NSString *sql = [NSString stringWithFormat:@"CREATE TABLE IF NOT EXISTS '%@' ('%@' " "TEXT PRIMARY KEY, '%@' TEXT);", UserTable, UserField,PassField];
if (sqlite3_exec(users, [sql UTF8String], NULL, NULL, &err)!=SQLITE_OK) {
sqlite3_close(users);
NSAssert(0, @"Could not create table");
}
else{
NSLog(@"table created");
}
}
-(NSString *) filePath {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
return [[paths objectAtIndex:0] stringByAppendingPathComponent:@"users.sql"];
}
-(void) openDB {
if (sqlite3_open([[self filePath]UTF8String],&users) != SQLITE_OK){
sqlite3_close(users);
NSAssert(0, @"Database failed to open");
}
else{
NSLog(@"database opened");
}
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[self openDB];
[self createTable:@"UserAccount" withUserField:@"Username" withPassField:@"Password"];
self.tbUsername.delegate=self;
self.tbPassword.delegate=self;
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)btnLogin:(id)sender {
NSString *select = [NSString stringWithFormat:@"SELECT * FROM UserAccount WHERE Username = '%s' and Password = '%s'",[tbUsername.text UTF8String],[tbPassword.text UTF8String]];
sqlite3_stmt *statement;
if (sqlite3_prepare(users, [select UTF8String], -1, &statement, nil)==SQLITE_OK)
{
if(sqlite3_step(statement)==SQLITE_ROW)
{
ViewController3 *VC = [self.storyboard instantiateViewControllerWithIdentifier:@"ViewController3"];
VC.strUsername = self.tbUsername.text;
[self presentViewController:VC animated:YES completion:nil];
}
else
{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Authentication Failed" message:@"Wrong Username/Password!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
}
}
}
- (IBAction)btnRegister:(id)sender {
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[super touchesBegan:touches withEvent:event];
[[self tbUsername]resignFirstResponder];
[[self tbPassword]resignFirstResponder];
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
return [textField resignFirstResponder];
}
@end
BRB了班。
这工作：D。非常感谢！ –