我正在尝试使用 parse.com 作为后端来设置注册视图，但由于某种原因，每当我开始输入重新输入密码字段时，只要我输入一些内容，它就会开始通过这个
else if ([password compare:passwordAgain] != NSOrderedSame) {
// We have non-zero strings.
// Check for equal password strings.
textError = YES;
errorText = [errorText stringByAppendingString:passwordMismatchText];
[_reEnterPasswordField becomeFirstResponder];
NSLog(@"stops here");
}
方法并向我发送错误消息 passwordMismatchText。每次我更改一个词时，无论是添加还是删除它，它都会通过这条消息。当我对 xib 使用相同的方法时，文件没有问题。但是在我尝试对故事板做同样的事情之后，我遇到了这个问题。我尝试为 _doneButton.enabled == YES 创建一个用户默认值，并在 errorText =[...] 消息周围放置另一个 if，但没有解决问题。我感谢您的帮助。
SignUpViewController.h
#import <UIKit/UIKit.h>
@interface SignUpViewController : UIViewController<UITextFieldDelegate>
@property (weak, nonatomic) IBOutlet UIBarButtonItem *doneButton;
@property (weak, nonatomic) IBOutlet UITextField *userNameField;
@property (weak, nonatomic) IBOutlet UITextField *passwordField;
@property (weak, nonatomic) IBOutlet UITextField *reEnterPasswordField;
- (IBAction)done:(id)sender;
- (IBAction)cancel:(id)sender;
@end
注册视图控制器.m
#import "SignUpViewController.h"
#import <Parse/Parse.h>
#import "ActivityView.h"
#import "ProfileViewController.h"
@interface SignUpViewController ()
- (void)textInputChanged:(NSNotification *)note;
-(void)processFieldEntries;
- (BOOL)shouldEnableDoneButton;
@end
@implementation SignUpViewController
@synthesize doneButton = _doneButton;
@synthesize userNameField = _userNameField;
@synthesize passwordField = _passwordField;
@synthesize reEnterPasswordField = _reEnterPasswordField;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
[[NSNotificationCenter defaultCenter ]addObserver:self selector:@selector(textInputChanged:) name: UITextFieldTextDidChangeNotification object:_userNameField];
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(textInputChanged:) name:UITextFieldTextDidChangeNotification object:_passwordField];
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(textInputChanged:) name:UITextFieldTextDidChangeNotification object:_reEnterPasswordField];
_doneButton.enabled = NO;
NSLog(@"nsnotification is working fine");
}
-(void)viewWillAppear:(BOOL)animated
{
[_userNameField becomeFirstResponder];
[super viewWillAppear:animated];
NSLog(@"indeed usernamefield became a first responder");
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
if (textField == _userNameField ) {
[_userNameField becomeFirstResponder];
}
if (textField == _passwordField) {
[_passwordField becomeFirstResponder];
}
if (textField == _reEnterPasswordField)
{
[_reEnterPasswordField becomeFirstResponder];
}
NSLog(@"keyboard action works fine ");
return YES;
}
-(BOOL)shouldEnableDoneButton
{
BOOL enableDoneButton = NO;
if (_userNameField.text != nil &&
_userNameField.text.length > 0 &&
_passwordField.text != nil &&
_passwordField.text.length > 0 &&
_reEnterPasswordField.text != nil &&
_reEnterPasswordField.text.length > 0)
{
[self processFieldEntries];
enableDoneButton = YES;
NSLog(@"done button enabled");
}
return enableDoneButton;
}
-(void)textInputChanged:(NSNotification *)note
{
_doneButton.enabled = [self shouldEnableDoneButton];
}
- (IBAction)done:(id)sender {
[_userNameField resignFirstResponder];
[_passwordField resignFirstResponder];
[_reEnterPasswordField resignFirstResponder];
[self processFieldEntries];
NSLog(@"do you see this");
}
- (IBAction)cancel:(id)sender
{
[self.presentingViewController dismissViewControllerAnimated:YES completion:nil];
}
-(void)processFieldEntries
{
// Check that we have a non-zero username and passwords.
// Compare password and passwordAgain for equality
// Throw up a dialog that tells them what they did wrong if they did it wrong.
NSString *username = _userNameField.text;
NSString *password = _passwordField.text;
NSString *passwordAgain = _reEnterPasswordField.text;
NSString *errorText = @"Please ";
NSString *usernameBlankText = @"enter a username";
NSString *passwordBlankText = @"enter a password";
NSString *joinText = @", and ";
NSString *passwordMismatchText = @"enter the same password twice";
BOOL textError = NO;
NSLog(@"validation begins here");
// Messaging nil will return 0, so these checks implicitly check for nil text.
if (username.length == 0 || password.length == 0 || passwordAgain.length == 0) {
textError = YES;
// Set up the keyboard for the first field missing input:
if (passwordAgain.length == 0) {
[_reEnterPasswordField becomeFirstResponder];
}
if (password.length == 0) {
[_passwordField becomeFirstResponder];
}
if (username.length == 0) {
[_userNameField becomeFirstResponder];
}
if (username.length == 0) {
errorText = [errorText stringByAppendingString:usernameBlankText];
}
if (password.length == 0 || passwordAgain.length == 0) {
if (username.length == 0) { // We need some joining text in the error:
errorText = [errorText stringByAppendingString:joinText];
}
errorText = [errorText stringByAppendingString:passwordBlankText];
}
} else if ([password compare:passwordAgain] != NSOrderedSame) {
// We have non-zero strings.
// Check for equal password strings.
textError = YES;
errorText = [errorText stringByAppendingString:passwordMismatchText];
[_reEnterPasswordField becomeFirstResponder];
NSLog(@"stops here");
}
if (textError) {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:errorText message:nil delegate:self cancelButtonTitle:nil otherButtonTitles:@"Ok", nil];
[alertView show];
return;
}
NSLog(@"validation works just fine");
// Everything looks good; try to log in.
// Disable the done button for now.
_doneButton.enabled = NO;
ActivityView *activityCircle = [[ActivityView alloc] initWithFrame:CGRectMake(0.f, 0.f, self.view.frame.size.width, self.view.frame.size.height)];
UILabel *label = activityCircle.label;
label.text = @"Signing You Up";
label.font = [UIFont boldSystemFontOfSize:20.f];
[activityCircle.activityIndicator startAnimating];
[activityCircle layoutSubviews];
[self.view addSubview:activityCircle];
NSLog(@"activity view works just fine");
//parse registeration
// Call into an object somewhere that has code for setting up a user.
// The app delegate cares about this, but so do a lot of other objects.
// For now, do this inline.
PFUser *user = [PFUser user];
user.username = username;
user.password = password;
[user signUpInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
if (error) {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:[[error userInfo] objectForKey:@"error"] message:nil delegate:self cancelButtonTitle:nil otherButtonTitles:@"Ok", nil];
[alertView show];
_doneButton.enabled = [self shouldEnableDoneButton];
[activityCircle.activityIndicator stopAnimating];
[activityCircle removeFromSuperview];
// Bring the keyboard back up, because they'll probably need to change something.
[_userNameField becomeFirstResponder];
return;
}
// Success!
[activityCircle.activityIndicator stopAnimating];
[activityCircle removeFromSuperview];
//add the next screen here
}];
NSLog(@"user signedup just fine");
//now pass the view from sign up to profile view
}
/*
//this one didnt work
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
ProfileViewController *myProfileView = [segue destinationViewController];
if (_doneButton.enabled == YES) {
[myProfileView performSegueWithIdentifier:@"SignUpSegue" sender:_doneButton];
}
}
*/
-(BOOL)shouldPerformSegueWithIdentifier:(NSString *)identifier sender:(id)sender
{
NSLog(@"is this method visible");
if (_doneButton.enabled == YES) {
[self performSegueWithIdentifier:@"SignUpSegue" sender:_doneButton];
}
return NO;
}
@end
这是我得到的日志文件
2013-09-06 02:49:19.938 nsnotification is working fine
2013-09-06 02:49:19.942 indeed usernamefield became a first responder
2013-09-06 02:49:47.446 validation begins here
2013-09-06 02:49:47.448 stops here
2013-09-06 02:49:47.485 done button enabled
2013-09-06 02:49:49.271 validation begins here
2013-09-06 02:49:49.273 stops here
2013-09-06 02:49:49.296 done button enabled
2013-09-06 02:49:51.257 validation begins here
2013-09-06 02:49:51.259 validation works just fine
2013-09-06 02:49:51.265 activity view works just fine
2013-09-06 02:49:51.270 user signedup just fine
2013-09-06 02:49:51.271 done button enabled