[英]Control the transition between two viewControllers
我是Objective-c的新手,最近開始使用Xcode制作iOS應用程序。 我正在制作一個具有兩個視圖控制器的登錄應用程序。 看起來像這樣: http : //imgur.com/W3nxMEG
現在我的問題是,只有在以下情況下,我才是進入第二個ViewController的應用程序:1)填寫了文本字段2)密碼匹配
那就是我寫的代碼。 我找不到基於某些約束來控制viewControlled之間的過渡的任何命令:
(IBAction)loginButton:(id)sender {
BOOL passMatch, emptyUser, emptyPass, emptyrePass;
passMatch = [password isEqualToString:reEnter];
emptyUser = [username isEqualToString:@""];
emptyPass = [password isEqualToString:@""];
emptyrePass = [reEnter isEqualToString:@""];
if (emptyPass || emptyUser || emptyrePass){
UIAlertView *error=[[UIAlertView alloc] initWithTitle:@"Ooops!" message:@"You must complete all the fields " delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[error show];
}
else{
passMatch = [password isEqualToString:reEnter];
if (passMatch){
UIAlertView *pass=[[UIAlertView alloc] initWithTitle:@"Success!" message:@"Passwords match " delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[pass show];
} else{
UIAlertView *error=[[UIAlertView alloc] initWithTitle:@"Ooops!" message:@"Passwords dont match " delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[error show];
}
}
如果有人可以幫助我解決這個問題,請多謝
首先確保您的storyBoard中的UITextField
和UIButton
與LoginViewController.h
的屬性掛鈎
它看起來像這樣:
LoginViewController.h
@interface LoginViewController : UIViewController
@property (strong, nonatomic) IBOutlet UITextField *password;
@property (strong, nonatomic) IBOutlet UITextField *username;
// and so on..
// for your button
@property (strong, nonatomic) IBOutlet UIButton *loginButton;
@end
LoginViewController.m
@implementation LoginViewController
-(IBAction)loginButton:(id)sender
{
// you can enable/disable your button here also, by:
// UIButton *senderButton = (UIButton *)sender;
// senderButton.enabled = YES/NO;
// i'm just using .length because i trust numbers more that the @""
NSString *errorMessage;
if (self.username.text.length == 0)
errorMessage = @"username is required";
else if (self.password.text.length == 0)
errorMessage = @"password is required";
else if (self.reEnter.text.length == 0)
errorMessage = @"please confirm your password";
else if (self.password.text.length == 0 || self.username.text.length == 0 || self.reEnter.text.length == 0)
errorMessage = @"You must complete all the fields";
if (errorMessage.length > 0)
{
UIAlertView *error=[[UIAlertView alloc] initWithTitle:@"Ooops!" message:errorMessage delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[error show];
}
else
{
if ([self.username.text isEqual: @"youUsername"] && [self.password.text isEqual: @"youPassword"] && [self.password.text isEqual: self.reEnter.text])
{
UIAlertView *pass=[[UIAlertView alloc] initWithTitle:@"Success!" message:@"Login successful" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[pass show];
//presentYourSecondViewController
//[self presentViewController:(UIViewController) animated:(BOOL) completion:nil];
//[self.navigationController pushViewController:(UIViewController)animated:(BOOL)];
}
else
{
UIAlertView *error=[[UIAlertView alloc] initWithTitle:@"Ooops!" message:@"Login failed" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[error show];
}
}
/* Your code...
BOOL passMatch, emptyUser, emptyPass, emptyrePass;
passMatch = [password isEqualToString:reEnter];
emptyUser = [username isEqualToString:@""];
emptyPass = [password isEqualToString:@""];
emptyrePass = [reEnter isEqualToString:@""];
if (emptyPass || emptyUser || emptyrePass){
UIAlertView *error=[[UIAlertView alloc] initWithTitle:@"Ooops!" message:@"You must complete all the fields " delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[error show];
}
else
{
passMatch = [password isEqualToString:reEnter];
if (passMatch){
UIAlertView *pass=[[UIAlertView alloc] initWithTitle:@"Success!" message:@"Passwords match " delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[pass show];
} else{
UIAlertView *error=[[UIAlertView alloc] initWithTitle:@"Ooops!" message:@"Passwords dont match " delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[error show];
}
}
*/
}
@end
您的狀況沒有問題,我想我剛結束。.無論如何希望我能幫助您,為編碼愉快而歡呼..
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