Ios 验证方法不适用于'；t被呼叫，而segue没有'；t被触发

我正在尝试用解析后端实现一个注册过程。我有一个名为processFieldEntries的验证方法，一旦启用了“完成”按钮，我会尝试触发我从视图控制器（而不是“完成”按钮）中通过“从视图中显示”方法模式设置的序列，但既不会调用验证方法，也不会触发序列。我设置了一些调试断点和日志断点进行调试，但是，除了它没有看到加载的视图这一事实之外，我不能再进一步了。我还尝试通过“完成”按钮设置segue。当我这样做的时候，segue被触发，不是从代码而是从故事板。如果有人能帮我弄清楚如何和segue一起调用ProcessFieldEntries，我将不胜感激。多谢各位

NewUserSignUpViewController.h

#import <UIKit/UIKit.h>
#import "ProfileViewController.h"

@interface NewUserSignUpViewController : UIViewController<UITextFieldDelegate>
@property (strong, nonatomic) IBOutlet UIBarButtonItem *barButtonItem;
@property (strong, nonatomic) IBOutlet UITextField *usernameField;
@property (strong, nonatomic) IBOutlet UITextField *passwordField;
@property (strong, nonatomic) IBOutlet UITextField *repeatPasswordField;
- (IBAction)doneEvent:(id)sender;
- (IBAction)cancelEvent:(id)sender;

@end

#导入
#导入“ProfileViewController.h”
@接口NewUserSignUpViewController:UIViewController
@性质（强的，非原子的）巴布托石*巴布托石；
@属性（强，非原子）IBOutlet UITextField*usernameField；
@属性（强，非原子）IBUITextField*passwordField；
@属性（强，非原子）IBOutlet UITextField*repeatPasswordField；
-（iAction）DoneeEvent:（id）发送方；
-（iAction）cancelEvent:（id）发送方；
@结束

NewUserSignUpViewController.m

#import "NewUserSignUpViewController.h"
#import "ProfileViewController.h"
#import <Parse/Parse.h>
#import "ActivityView.h"
@interface NewUserSignUpViewController ()
-(void)processFieldEntries;
- (void)textInputChanged:(NSNotification *)note;
- (BOOL)shouldEnableDoneButton;
@end

@implementation NewUserSignUpViewController
@synthesize barButtonItem = _doneButtonInTheBar;


- (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:_repeatPasswordField];



}
-(void)viewDidAppear:(BOOL)animated
{
    [_usernameField becomeFirstResponder];
    [super viewDidAppear:animated];
    //perform the segue
    if (_doneButtonInTheBar.enabled == YES) {
        [self performSegueWithIdentifier:@"segueToProfileView" sender:self];
    }



}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (void)dealloc {

}

#pragma mark - UITextFieldDelegate
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{   textField.delegate = self;
    if (textField == _usernameField) {[_usernameField becomeFirstResponder];}
    if (textField == _passwordField){[_passwordField becomeFirstResponder];}
    if (textField == _repeatPasswordField)
    {

        [_repeatPasswordField becomeFirstResponder];
        [self processFieldEntries];
    }
    return YES;
}
-(BOOL)shouldEnableDoneButton
{
    BOOL enableDoneButton = NO;

    if (_usernameField.text != nil && _usernameField.text.length != 0 &&_passwordField.text != nil &&
        _passwordField.text.length !=0 && _repeatPasswordField.text != nil &&
        _repeatPasswordField.text.length != 0) {
        enableDoneButton = YES;
        [self processFieldEntries];


    }
    return enableDoneButton;
}

-(void)textInputChanged:(NSNotification *)note
{
    _doneButtonInTheBar.enabled = [ self shouldEnableDoneButton];
}
- (IBAction)doneEvent:(id)sender {
    [_usernameField resignFirstResponder];
    [_passwordField resignFirstResponder];
    [_repeatPasswordField resignFirstResponder];
    NSLog(@"processfieldentries");
    [self processFieldEntries];
}

- (IBAction)cancelEvent:(id)sender {
    [self.presentedViewController dismissViewControllerAnimated:YES completion:nil];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(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 = _repeatPasswordField.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;
// 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;
    //setting the keyboard for th first missing output
    if (passwordAgain.length == 0) {
        [_repeatPasswordField 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)
{errorText = [errorText stringByAppendingString:passwordMismatchText];
    [_passwordField becomeFirstResponder];}
    if (textError) {
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:errorText message:nil delegate:self cancelButtonTitle:nil otherButtonTitles:@"Ok", nil];
        [alertView show];
        return;
        // Everything looks good; try to log in.
        // Disable the done button for now.
        _doneButtonInTheBar.enabled = NO;

        ActivityView *activityView = [[ActivityView alloc]initWithFrame:CGRectMake(0.f, 0.f, self.view.frame.size.width, self.view.frame.size.height)];
        UILabel *label = activityView.label;
        label.text = @"signing up";
        label.font = [UIFont boldSystemFontOfSize:20.0f];
        [activityView.activityIndicator startAnimating];
        [activityView layoutSubviews];
        [self.view addSubview:activityView];

        // 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.
        NSLog(@"does it reach here");
        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];
                _doneButtonInTheBar.enabled = [self shouldEnableDoneButton];
                [activityView.activityIndicator stopAnimating];
                [activityView removeFromSuperview];
                // Bring the keyboard back up, because they'll probably need to change something.
                [_usernameField becomeFirstResponder];
                return;
            }
            // Success!
            [activityView.activityIndicator stopAnimating];
            [activityView removeFromSuperview];
            }];

    }

}
@end

#导入“NewUserSignUpViewController.h”
#导入“ProfileViewController.h”
#进口
#导入“ActivityView.h”
@接口NewUserSignUpViewController（）
-（作废）处理字段条目；
-（作废）文本输入更改：（NSNotification*）注释；
-（BOOL）应启用一个按钮；
@结束
@实现NewUserSignUpViewController
@合成巴布托宁=_doneButtonInTheBar；
-（id）initWithNibName:（NSString*）nibNameOrNil bundle:（NSBundle*）nibBundleOrNil
{
self=[super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]；
如果（自我）{
//自定义初始化
}
回归自我；
}
-（无效）viewDidLoad
{
[超级视图下载]；
[[NSNotificationCenter defaultCenter]添加观察者：自选择器：@selector（textInputChanged:）名称：UITextFieldTextDidChangeNotification对象：_usernameField]；
[[NSNotificationCenter defaultCenter]添加观察者：自选择器：@selector（textInputChanged:）名称：UITextFieldTextDidChangeNotification对象：_passwordField]；
[[NSNotificationCenter defaultCenter]添加观察者：自选择器：@selector（textInputChanged:）名称：UITextFieldTextDidChangeNotification对象：_repeatPasswordField]；
}
-（无效）视图显示：（BOOL）动画
{
[\u usernameField成为第一响应者]；
[超级视图显示：动画]；
//表演这一段
如果（_doneButtonInTheBar.enabled==是）{
[self-PerformsgueWithIdentifier:@“segueToProfileView”发件人：self]；
}
}
-（布尔）应自动旋转指针面定向：（UIInterfaceOrientation）interfaceOrientation{
//对于支持的方向返回YES
返回（interfaceOrientation==UIInterfaceOrientationGraphic）；
}
-（无效）解除锁定{
}
#pragma标记-UITextFieldDelegate
-（BOOL）textField应返回：（UITextField*）textField
{textField.delegate=self；
如果（textField==\u usernameField）{[\u usernameField becomeFirstResponder]；}
如果（textField==_passwordField）{[_passwordfieldbecomefirstresponder]；}
if（textField==\u repeatPasswordField）
{
[_repeatPasswordField成为第一响应者]；
[自我处理字段输入]；
}
返回YES；
}
-（BOOL）应禁用一个按钮
{
BOOL enableDoneButton=否；
如果（_usernameField.text！=nil&&u usernameField.text.length！=0&&u passwordField.text！=nil&&
_passwordField.text.length！=0&&u repeatPasswordField.text！=nil&&
_repeatPasswordField.text.length！=0）{
enableDoneButton=YES；
[自我处理字段输入]；
}
返回使能按钮；
}
-（无效）textInputChanged:（NSNotification*）注释
{
_doneButtonInTheBar.enabled=[self shouldEnableDoneButton]；
}
-（iAction）DoneeEvent:（id）发件人{
[[u usernameField辞职firstresponder]；
[[u passwordField辞职FirstResponder]；
[_repeatPasswordField辞职FirstResponder]；
NSLog（@“processfieldentries”）；
[自我处理字段输入]；
}
-（iAction）取消事件：（id）发送方{
[self.presentedViewController dismissViewControllerAnimated:YES完成：nil]；
}
-（无效）未收到记忆警告
{
[超级记忆警告]；
//处置所有可以重新创建的资源。
}
-（作废）processFieldEntries
{
//检查我们是否有非零用户名和密码。
//再次比较password和password是否相等
//抛出一个对话，告诉他们如果他们做错了，他们做错了什么。
NSString*username=\u usernameField.text；
NSString*password=\u passwordField.text；
NSString*password再次=\u repeatPasswordField.text；
NSString*errorText=@“请”；
NSString*UsernameBankText=@“输入用户名”；
NSString*passwordBlankText=@“输入密码”；
NSString*joinText=@“，和”；
NSString*passwordmistchtext=@“输入相同的密码两次”；
BOOL textError=否；
//消息nil将返回0，因此这些检查隐式地检查nil文本。
如果（username.length==0 | | | password.length==0 | | | password再次出现。length==0）{
text错误=是；
//为第一个丢失的输出设置键盘
if（passwordreathere.length==0）{
[_repeatPasswordField成为第一响应者]；
}
if（password.length==0）{
[[u passwordField成为第一响应者]；
}
如果（username.length==0）{
[\u usernameField成为第一响应者]；
}
如果（username.length==0）{
errorText=[errorText stringByAppendingString:UserName BlankText]；
}
if（password.length==0 | | passwordreach.length==0）{
如果（username.length==0）{//我们需要在错误中加入一些连接文本：
errorText=[errorText stringByAppendingString:joinText]；
}
errorText=[er