您好我正在尝试使用准备segue方法执行segue。我正在关注这个问题this，但我无法成功注册。当我单击注册按钮时，它只会注册用户并停在那里。我从视图控制器模式连接我的segue（而不是从按钮本身），所以那个没有问题。我的发送视图只是一个带有文本字段和完成按钮的普通视图，我的接收视图是一个静态表视图，行上有一个标签（称为nameLabel）。
2个问题
1.我准备segue方法时缺少什么？（另外我使用parse作为后端，这就是PFLogInSuccessNotification来自的地方）
感谢您花时间帮忙。
**my segue method**
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
NSLog(@"can you see this");
if ([segue.identifier isEqualToString:@"SegueTOprofile"])
{
if (PFLogInSuccessNotification) {
profileTableViewController *myProfileView = (profileTableViewController *)[segue destinationViewController];
PFUser *user =[PFUser user];
user.username = myProfileView.nameLabel.text;
// NSLog(@"%@",myProfileView.nameLabel.text);
}
}
[self performSegueWithIdentifier:@"SegueTOprofile" sender:self];
}
**这是我的注册视图** .H
#import <UIKit/UIKit.h>
extern NSString *const PFSignUpSuccessNotification;
extern NSString *const PFSignUpFailureNotification;
@interface SignUpViewController : UIViewController<UITextFieldDelegate>
@property (strong, nonatomic) IBOutlet UITextField *emailNameField;
@property (strong, nonatomic) IBOutlet UITextField *passwordField;
@property (strong, nonatomic) IBOutlet UIButton *signupButton;
- (IBAction)SignUp:(id)sender;
@property (strong, nonatomic) IBOutlet UITextField *repeatPasswordField;
@property (strong, nonatomic) IBOutlet UIBarButtonItem *BackButton;
@property (strong, nonatomic) IBOutlet UITextField *usernameField;
的.m
#import "SignUpViewController.h"
#import "profileTableViewController.h"
#import <Parse/Parse.h>
#import "ActivityView.h"
#import "TabBarCustomClassViewController.h"
@interface SignUpViewController ()
-(void)processFieldEntries;
- (void)textInputChanged:(NSNotification *)note;
- (BOOL)shouldEnableDoneButton;
@end
@implementation SignUpViewController
@synthesize signupButton = _signupButton;
- (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:_emailNameField];
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(textInputChanged:) name:UITextFieldTextDidChangeNotification object:_passwordField];
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(textInputChanged:) name:UITextFieldTextDidChangeNotification object:_repeatPasswordField];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
if (textField == _usernameField) {
[_usernameField becomeFirstResponder];
}
if (textField == _emailNameField) {
[_emailNameField becomeFirstResponder];}
if (textField == _passwordField) {
[_passwordField becomeFirstResponder];
}
if (textField == _repeatPasswordField) {
[_repeatPasswordField becomeFirstResponder];
}
return YES;
}
-(BOOL)shouldEnableDoneButton
{
BOOL enableDoneButton = NO;
if (_emailNameField.text != nil && _passwordField.text != nil && _repeatPasswordField != nil && _usernameField.text != nil) {
enableDoneButton = YES;
}
return enableDoneButton;
}
/*
// Using segue --> Send the current selected profile to "ProfileView"
ProfileViewController *aProfileView = (ProfileViewController *)[segue destinationViewController];
aProfileView.currentProfile = selectedProfile; */
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
NSLog(@"can you see this");
if ([segue.identifier isEqualToString:@"SegueTOprofile"])
{
if (PFLogInSuccessNotification) {
profileTableViewController *myProfileView = (profileTableViewController *)[segue destinationViewController];
PFUser *user =[PFUser user];
user.username = myProfileView.nameLabel.text;
// NSLog(@"%@",myProfileView.nameLabel.text);
}
}
[self performSegueWithIdentifier:@"SegueTOprofile" sender:self];
}
-(void)textInputChanged:(NSNotification *)note
{
_signupButton.enabled = [self shouldEnableDoneButton];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)SignUp:(id)sender {
[_usernameField resignFirstResponder];
[_emailNameField resignFirstResponder];
[_passwordField resignFirstResponder];
[_repeatPasswordField resignFirstResponder];
[self processFieldEntries];
}
-(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 *email = _emailNameField.text;
NSString *passwordd = _passwordField.text;
NSString *passwordAgainn = _repeatPasswordField.text;
NSString *username = _usernameField.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;
if (email.length == 0 || passwordd.length == 0 || passwordAgainn.length == 0) {
textError = YES;
// Set up the keyboard for the first field missing input:
if (passwordAgainn.length == 0) {
[_repeatPasswordField becomeFirstResponder];
}
if (passwordd.length == 0) {
[_passwordField becomeFirstResponder];
}
if (username.length == 0) {
[_usernameField becomeFirstResponder];
}
if (email.length == 0) {
errorText = [errorText stringByAppendingString:usernameBlankText];
}
if (passwordd.length == 0 || passwordAgainn.length == 0) {
if (email.length == 0) { // We need some joining text in the error:
errorText = [errorText stringByAppendingString:joinText];
}
errorText = [errorText stringByAppendingString:passwordBlankText];
}
} else if ([passwordd compare:passwordAgainn] != NSOrderedSame) {
// We have non-zero strings.
// Check for equal password strings.
if (_signupButton.enabled == YES) {
textError = YES;
errorText = [errorText stringByAppendingString:passwordMismatchText];
}
}
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.
_signupButton.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 You Up";
label.font = [UIFont boldSystemFontOfSize:20.f];
[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.
PFUser *user = [PFUser user];
user.email = email;
user.password = passwordAgainn;
user.username = username;
[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];
_signupButton.enabled = [self shouldEnableDoneButton];
[activityView.activityIndicator stopAnimating];
[activityView removeFromSuperview];
// Bring the keyboard back up, because they'll probably need to change something.
[_emailNameField becomeFirstResponder];
return;
}
// Success!
[activityView.activityIndicator stopAnimating];
[activityView removeFromSuperview];
}];
}
@end
答案 0 :(得分：2)
prepareForSegue不执行segue，它是您可以将数据传递到目标视图控制器的地方。如果您已连接控制器中的segue（而不是按钮），则必须使用performSegueWithIdentifier手动调用segue：sender：
如果你想用这一行触发它：
[self shouldPerformSegueWithIdentifier:@"SegueTOprofile" sender:self];
应该是：
[self performSegueWithIdentifier:@"SegueTOprofile" sender:self];
我不知道这是不是你想要的，因为你在代码中使用了2个不同的segue标识符。
答案 1 :(得分：0)
以下是如何使用parse.com作为后端实现登录过程的简洁示例。这最终是我所需要的，我也在这里发帖。