Tạo giao diện người dùng đơn giản thông qua mã sử dụng Xamarin.iOS

Question

Tôi cần tạo biểu mẫu đăng nhập đơn giản (Tên người dùng/Mật khẩu) cho bản trình diễn bằng Xamarin.iOS, nhưng tôi không muốn đi sâu vào XCode cho thời điểm này .

Có lẽ một cái gì đó tương tự như những gì bạn có thể làm trong các công nghệ .NET khác:

var panel = new Panel(); 
panel.Controls.Add(new Label("Username")); 
panel.Controls.Add(new TextBox("Password")); 

Có cách nào để tạo ra giao diện đơn giản trong Xamarin dành cho iOS programatically? Hoặc nó là cần thiết để thiết kế các giao diện bằng cách sử dụng XCode chỉ?

Answer 1

Có, bạn có thể tạo giao diện người dùng thông qua mã. Sử dụng thiết kế của XCode là hoàn toàn tùy chọn.

UIButton btn = new UIButton (UIButtonType.RoundedRect);
   
btn.SetTitle ("Hello", UIControlState.Normal); 

btn.Frame = new RectangleF (50, 50, 50, 50);
 
  

btn.TouchDown += delegate {
  
     UIAlertView alert = new UIAlertView("Hello", "Hello, Xamarin!", null, "OK"); 

  alert.Show(); 

 }; 


this.View.AddSubview (btn);
  

Giao diện người dùng nhập dữ liệu, bạn cũng có thể cân nhắc sử dụng MonoTouch.Dialog.

Answer 2

Có lẽ một chút muộn để các trò chơi, nhưng có bạn đã cố gắng chỉ sử dụng một UIAlertView và sau đó thực hiện:

yourAlertView.AlertViewStyle = UIAlertViewStyle.LoginAndPasswordInput; 

Nó sẽ tạo một cửa sổ popup đăng nhập với textfields đã thiết lập cho bạn.

Answer 3

@implementation MyViewController 

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{ 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     // Custom initialization 
    } 
    return self; 
} 


#pragma mark - View lifecycle 

/* 
// Implement loadView to create a view hierarchy programmatically, without using a nib. 
- (void)loadView 
{ 
} 
*/ 

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib. 
- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view. 
    [self.view setBackgroundColor:[UIColor whiteColor]]; 
    currentTF = [[UITextField alloc]init]; 
    [self createLoginUI]; 
} 
- (void)viewWillAppear:(BOOL)animated 
{ 
    [super viewWillAppear:YES]; 
} 
-(void)createLoginUI 
{ 
    //For My Label 
    UILabel *MyLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 340, 20)]; 
    MyLabel.text = @"My Login Screen"; 
    MyLabel.textAlignment = UITextAlignmentCenter; 
    MyLabel.textColor = [UIColor blackColor]; 
    MyLabel.backgroundColor=[UIColor cyanColor]; 
    MyLabel.font = [UIFont fontWithName:@"Arial-Bold" size:14.0]; 
    [self.view addSubview:MyLabel]; 


    //For Email Label 
    UILabel *emailLabel = [[UILabel alloc]initWithFrame:CGRectMake(20, 40, 50, 20)]; 
    emailLabel.text = @"Email:"; 
    emailLabel.textColor = [UIColor blackColor]; 
    emailLabel.font = [UIFont fontWithName:@"Arial-Bold" size:14.0]; 
    [self.view addSubview:emailLabel]; 

    //For Email UITextField 
    emailTF = [[UITextField alloc]initWithFrame:CGRectMake(85, 40, 200, 30)]; 
    [emailTF setBorderStyle:UITextBorderStyleRoundedRect]; 
    emailTF.delegate = self; 
    emailTF.tag = 101; 
    [self.view addSubview:emailTF]; 

    //For Password Label 
    UILabel *passwordLabel = [[UILabel alloc]initWithFrame:CGRectMake(20, 80, 100, 20)]; 
    passwordLabel.text = @"Password:"; 
    passwordLabel.textColor = [UIColor blackColor]; 
    passwordLabel.font = [UIFont fontWithName:@"Arial-Bold" size:14.0]; 
    [self.view addSubview:passwordLabel]; 

    //For Password UITextField 
    passwordTF = [[UITextField alloc]initWithFrame:CGRectMake(105, 80, 180, 30)]; 
    passwordTF.secureTextEntry = YES; 
    passwordTF.delegate = self; 
    passwordTF.tag = 102; 
    [passwordTF setBorderStyle:UITextBorderStyleRoundedRect]; 
    [self.view addSubview:passwordTF]; 

    //For Login Button 
    UIButton *loginBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
    [loginBtn setTitle:@"Login" forState:UIControlStateNormal]; 
    loginBtn.frame = CGRectMake(120, 130, 50, 20); 
    loginBtn.backgroundColor = [UIColor greenColor]; 
    [loginBtn addTarget:self action:@selector(loginBtnClick) forControlEvents:UIControlEventTouchUpInside]; 
    [self.view addSubview:loginBtn]; 

    //For Forgot Password Button 
    UIButton *forgotPasswdBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
    [forgotPasswdBtn setTitle:@"Forgot Password" forState:UIControlStateNormal]; 
    forgotPasswdBtn.frame = CGRectMake(30, 170, 120, 20); 
    forgotPasswdBtn.backgroundColor = [UIColor greenColor]; 
    [forgotPasswdBtn addTarget:self action:@selector(forgotPasswordBtnClick) forControlEvents:UIControlEventTouchUpInside]; 
    [self.view addSubview:forgotPasswdBtn]; 


    //For sign up Button 
    UIButton *signUpBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
    [signUpBtn setTitle:@"SignUp" forState:UIControlStateNormal]; 
    signUpBtn.frame = CGRectMake(170, 170, 60, 20); 
    signUpBtn.backgroundColor = [UIColor greenColor]; 
    [signUpBtn addTarget:self action:@selector(signUpBtnClick) forControlEvents:UIControlEventTouchUpInside]; 
    [self.view addSubview:signUpBtn]; 


    //For remember Me 
    UIButton *remBtn = [UIButton buttonWithType:UIButtonTypeCustom]; 
    [remBtn setImage:[UIImage imageNamed:@"uncheck.jpeg"] forState:UIControlStateNormal]; 
    remBtn.frame = CGRectMake(90, 130, 20, 20); 
    [remBtn addTarget:self action:@selector(remBtnClick) forControlEvents:UIControlEventTouchUpInside]; 
    [self.view addSubview:remBtn]; 


} 
-(void)loginBtnClick 
{ 
    [currentTF resignFirstResponder]; 
    if ([self validateLoginScreen]) 
    { 
     //To clear textFields 
     emailTF.text= @""; 
     passwordTF.text = @""; 
     //For Home View 
     homeViewObj = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)]; 
     [homeViewObj setBackgroundColor:[UIColor purpleColor]]; 
     [self.view addSubview:homeViewObj]; 

     //For Logout Button 
     UIButton *logOutBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
     [logOutBtn setTitle:@"Logout" forState:UIControlStateNormal]; 
     logOutBtn.frame = CGRectMake(170, 170, 60, 20); 
     //  logOutBtn.backgroundColor = [UIColor greenColor]; 
     [logOutBtn addTarget:self action:@selector(logOutBtnClick) forControlEvents:UIControlEventTouchUpInside]; 
     [homeViewObj addSubview:logOutBtn]; 

    } 

} 
-(void)forgotPasswordBtnClick 
{ 

    UIAlertView *alertview=[[UIAlertView alloc]initWithTitle:@"Forgot Password" message:@"please enter sequrity qustion" delegate:self cancelButtonTitle:@"cancel" otherButtonTitles:@"ok", nil]; 
    alertview.alertViewStyle=UIAlertViewStylePlainTextInput; 
    [alertview textFieldAtIndex:0].delegate=self; 
    [alertview show]; 
} 

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex 
{ 
    if(buttonIndex==1) 
    { 
     UIAlertView *alertview2=[[UIAlertView alloc]initWithTitle:@"Reset password" message:@"new password is send to your mail id" delegate:self cancelButtonTitle:nil otherButtonTitles:@"ok", nil]; 
     [alertview2 show]; 
    } 

} 


-(void)signUpBtnClick 
{ 

    //[currentTF resignFirstResponder]; 
    viewobjsignup=[[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)]; 
    [viewobjsignup setBackgroundColor:[UIColor grayColor]]; 
    [self.view addSubview:viewobjsignup]; 
    UILabel *MyLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 340, 20)]; 
     MyLabel.text = @"Register Here"; 
    MyLabel.textAlignment = UITextAlignmentCenter; 
     MyLabel.textColor = [UIColor blackColor]; 
     MyLabel.backgroundColor=[UIColor cyanColor]; 
     MyLabel.font = [UIFont fontWithName:@"Arial-Bold" size:14.0]; 
     [viewobjsignup addSubview:MyLabel]; 

    //username 
    UILabel *usernmobj=[[UILabel alloc]initWithFrame:CGRectMake(20, 40, 100, 20)]; 
    usernmobj.text=@"UserName"; 
    usernmobj.textAlignment = UITextAlignmentCenter; 
    usernmobj.textColor = [UIColor blackColor]; 
    usernmobj.backgroundColor=[UIColor cyanColor]; 
    usernmobj.font = [UIFont fontWithName:@"Arial-Bold" size:14.0]; 
    [viewobjsignup addSubview:usernmobj]; 

    userTF = [[UITextField alloc]initWithFrame:CGRectMake(120, 40, 150, 30)]; 
    //userTF.secureTextEntry = YES; 
    userTF.delegate = self; 
    // userTF.tag = 102; 
    [userTF setBorderStyle:UITextBorderStyleRoundedRect]; 
    [viewobjsignup addSubview:userTF]; 

    userTF.returnKeyType=UIReturnKeyDone; 


    //email id 
    UILabel *Emailnmobj=[[UILabel alloc]initWithFrame:CGRectMake(20, 80, 80, 20)]; 
    Emailnmobj.text=@"Email Id"; 
    Emailnmobj.textAlignment = UITextAlignmentCenter; 
    Emailnmobj.textColor = [UIColor blackColor]; 
    Emailnmobj.backgroundColor=[UIColor cyanColor]; 
    Emailnmobj.font = [UIFont fontWithName:@"Arial-Bold" size:14.0]; 
    [viewobjsignup addSubview:Emailnmobj]; 

    EmailTF = [[UITextField alloc]initWithFrame:CGRectMake(120, 80, 150, 30)]; 
    //EmailTF.secureTextEntry = YES; 
    EmailTF.delegate = self; 
    // EmailTF.tag = 102; 
    [EmailTF setBorderStyle:UITextBorderStyleRoundedRect]; 
    [viewobjsignup addSubview:EmailTF]; 
    EmailTF.returnKeyType=UIReturnKeyDone; 


    //password 
    UILabel *passnmobj=[[UILabel alloc]initWithFrame:CGRectMake(20,120,100,20)]; 
    passnmobj.text=@"Password"; 
    passnmobj.textAlignment = UITextAlignmentCenter; 
    passnmobj.textColor = [UIColor blackColor]; 
    passnmobj.backgroundColor=[UIColor cyanColor]; 
    passnmobj.font = [UIFont fontWithName:@"Arial-Bold" size:14.0]; 
    [viewobjsignup addSubview:passnmobj]; 

    pwdTF = [[UITextField alloc]initWithFrame:CGRectMake(120, 120, 170, 30)]; 
    pwdTF.secureTextEntry = YES; 
    pwdTF.delegate = self; 
    // pwdTF.tag = 102; 
    [pwdTF setBorderStyle:UITextBorderStyleRoundedRect]; 
    [viewobjsignup addSubview:pwdTF]; 
    pwdTF.returnKeyType=UIReturnKeyDone; 


    //conform password 
    UILabel *comfobj=[[UILabel alloc]initWithFrame:CGRectMake(20,160,100,20)]; 
    comfobj.text=@"Confpass"; 
    //comfobj.textAlignment = UITextAlignmentCenter; 
    comfobj.textColor = [UIColor blackColor]; 
    comfobj.backgroundColor=[UIColor cyanColor]; 
    comfobj.font = [UIFont fontWithName:@"Arial-Bold" size:14.0]; 
    [viewobjsignup addSubview:comfobj]; 

    comfTF = [[UITextField alloc]initWithFrame:CGRectMake(120, 160, 180, 30)]; 
    comfTF.secureTextEntry = YES; 
    comfTF.delegate = self; 
    // comfTF.tag = 102; 
    [comfTF setBorderStyle:UITextBorderStyleRoundedRect]; 
    [viewobjsignup addSubview:comfTF]; 
    comfTF.returnKeyType=UIReturnKeyDone; 


    //for dob 
    UILabel *Dboobj=[[UILabel alloc]initWithFrame:CGRectMake(20, 190, 140, 20)]; 


    Dboobj.text=@"DOB"; 
    Dboobj.textAlignment = UITextAlignmentCenter; 
    Dboobj.textColor = [UIColor blackColor]; 
    Dboobj.backgroundColor=[UIColor cyanColor]; 
    Dboobj.font = [UIFont fontWithName:@"Arial-Bold" size:14.0]; 
    [viewobjsignup addSubview:Dboobj]; 


    //textfiels for date 

    UITextField *dateobj=[[UITextField alloc]initWithFrame:CGRectMake(20, 210, 90, 30)]; 
    [dateobj setBorderStyle:UITextBorderStyleRoundedRect]; 
    dateobj.placeholder=@"Date"; 
    [dateobj setKeyboardType:UIKeyboardTypeNumberPad]; 
    dateobj.tag=105; 
    dateobj.delegate=self; 
    [viewobjsignup addSubview:dateobj]; 
    dateobj.returnKeyType=UIReturnKeyDone; 

// //txtfield for DOB_date 
// UITextField * dob_dateLab=[[UITextField alloc]initWithFrame:CGRectMake(20, 270, 90, 30)]; 
// [dob_dateLab setBorderStyle:UITextBorderStyleRoundedRect]; 
// dob_dateLab.placeholder=@"Date"; 
// [dob_dateLab setKeyboardType:UIKeyboardTypeNumberPad]; 
// dob_dateLab.tag=104; 
// dob_dateLab.delegate = self; 
// [viewobjsignup addSubview:dob_dateLab]; 

    //txtfield for month 
    UITextField * monthobj=[[UITextField alloc]initWithFrame:CGRectMake(110, 210, 90, 30)]; 
    [monthobj setBorderStyle:UITextBorderStyleRoundedRect]; 
    monthobj.delegate = self; 
    [monthobj setKeyboardType:UIKeyboardTypeNumberPad]; 
    monthobj.tag=106; 
    monthobj.placeholder=@"Month"; 
    [viewobjsignup addSubview:monthobj]; 
    monthobj.returnKeyType=UIReturnKeyDone; 

    //txtfield for year 
    UITextField * yearobj=[[UITextField alloc]initWithFrame:CGRectMake(200, 210, 90, 30)]; 
    [yearobj setBorderStyle:UITextBorderStyleRoundedRect]; 
    yearobj.delegate = self; 
    [yearobj setKeyboardType:UIKeyboardTypeNumberPad]; 
    yearobj.tag=107; 
    yearobj.placeholder=@"Year"; 
    [viewobjsignup addSubview:yearobj]; 
    yearobj.returnKeyType=UIReturnKeyDone; 

    //for label gender 
    UILabel *genderobj=[[UILabel alloc]initWithFrame:CGRectMake(20, 240, 80, 20)]; 

    genderobj.text=@"Gender"; 
    genderobj.textAlignment = UITextAlignmentCenter; 
    genderobj.textColor = [UIColor blackColor]; 
    genderobj.backgroundColor=[UIColor cyanColor]; 
    genderobj.font = [UIFont fontWithName:@"Arial-Bold" size:14.0]; 
    [viewobjsignup addSubview:genderobj]; 


    //for male 

    UILabel *maleobj=[[UILabel alloc]initWithFrame:CGRectMake(120, 240, 40, 20)]; 

    maleobj.text=@"male"; 
    maleobj.textAlignment = UITextAlignmentCenter; 
    maleobj.textColor = [UIColor blackColor]; 
    maleobj.backgroundColor=[UIColor cyanColor]; 
    maleobj.font = [UIFont fontWithName:@"Arial-Bold" size:14.0]; 
    [viewobjsignup addSubview:maleobj]; 


    //for female 

    UILabel *femaleobj=[[UILabel alloc]initWithFrame:CGRectMake(200, 240, 80, 20)]; 

    femaleobj.text=@"Female"; 
    femaleobj.textAlignment = UITextAlignmentCenter; 
    femaleobj.textColor = [UIColor blackColor]; 
    femaleobj.backgroundColor=[UIColor cyanColor]; 
    femaleobj.font = [UIFont fontWithName:@"Arial-Bold" size:14.0]; 
    [viewobjsignup addSubview:femaleobj]; 


    //for male radio but 
    malebut=[UIButton buttonWithType:UIButtonTypeCustom]; 

    [malebut setImage:[UIImage imageNamed:@"radio_check.jpeg"] forState:UIControlStateNormal]; 
    //[malebut setImage:[UIImage imageNamed:@"radiobutton-checked.png"] forState:UIControlStateNormal]; 
    malebut.frame = CGRectMake(160, 240, 20, 20); 
    [malebut addTarget:self action:@selector(radioBtnClick_male) forControlEvents:UIControlEventTouchUpInside]; 
    [viewobjsignup addSubview:malebut]; 


    //For female radio but 
    femalebut = [UIButton buttonWithType:UIButtonTypeCustom]; 
    [ femalebut setImage:[UIImage imageNamed:@"radio_uncheck.jpeg"] forState:UIControlStateNormal]; 
    femalebut.frame = CGRectMake(270, 240, 20, 20); 
    [ femalebut addTarget:self action:@selector(radioBtnClick_female) forControlEvents:UIControlEventTouchUpInside]; 
    [viewobjsignup addSubview:femalebut]; 




    //For Save button 
    UIButton * savebut = [UIButton buttonWithType:UIButtonTypeCustom]; 
    [savebut setTitle:@"Save" forState:UIControlStateNormal]; 
    savebut.titleLabel.backgroundColor=[UIColor blackColor]; 
    savebut.frame = CGRectMake(90, 430, 70, 20); 
    [savebut addTarget:self action:@selector(saveBtnClick) forControlEvents:UIControlEventTouchUpInside]; 
    [viewobjsignup addSubview:savebut]; 


    //For cancel button 
    UIButton * cancelBtn = [UIButton buttonWithType:UIButtonTypeCustom]; 
    cancelBtn.frame = CGRectMake(150, 430, 60, 20); 
    [cancelBtn setTitle:@"Cancel" forState:UIControlStateNormal]; 
    cancelBtn.titleLabel.backgroundColor=[UIColor blackColor]; 
    cancelBtn.backgroundColor=[UIColor blackColor]; 
    [cancelBtn addTarget:self action:@selector(cancelBtnClick1) forControlEvents:UIControlEventTouchUpInside]; 
    [viewobjsignup addSubview:cancelBtn]; 

    //register button 
// UIButton *registerbut=[UIButton buttonWithType:UIButtonTypeRoundedRect]; 
// [registerbut setTitle:@"Register" forState:UIControlStateNormal]; 
// [registerbut setFrame:CGRectMake(20,200,160,20)]; 
// [registerbut addTarget:self action:@selector(Registerclick) forControlEvents:UIControlEventTouchUpInside]; 
// [viewobjsignup addSubview:registerbut]; 


// //labal 
// myleb=[[UILabel alloc]initWithFrame:CGRectMake(20,160,140,20)]; 
// //comfobj.text=@" ConfermPassword"; 
// myleb.textAlignment = UITextAlignmentCenter; 
//  myleb.textColor = [UIColor blackColor]; 
//  myleb.backgroundColor=[UIColor cyanColor]; 
//  myleb.font = [UIFont fontWithName:@"Arial-Bold" size:14.0]; 
// [self.view addSubview: myleb]; 


} 



-(void)radioBtnClick_female 
{ 


    [femalebut setImage:[UIImage imageNamed:@"radio_check.jpeg"] forState:UIControlStateNormal]; 
    [malebut setImage:[UIImage imageNamed:@"radio_uncheck.jpeg"] forState:UIControlStateNormal]; 
} 


-(void)radioBtnClick_male 
{ 


    [femalebut setImage:[UIImage imageNamed:@"radio_uncheck.jpeg"] forState:UIControlStateNormal]; 
    [malebut setImage:[UIImage imageNamed:@"radio_check.jpeg"] forState:UIControlStateNormal]; 

} 



-(void)logOutBtnClick 
{ 
    [homeViewObj removeFromSuperview]; 
} 
-(void)remBtnClick 
{ 

} 


-(void)cancelBtnClick1 
{ 
    [viewobjsignup removeFromSuperview]; 

} 

-(void)saveBtnClick 
{ 
    [currentTF resignFirstResponder]; 

    [self validregister]; 

} 


-(void)validregister 
{ 
    if(userTF.text.length==00||pwdTF.text.length==00||comfTF.text.length==00) 

    { 
     [self showAlertMessage:@"Please enter all nesessary field"]; 

    } 
    else if([self emailValidation:EmailTF.text]==NO) 


     { 
      [self showAlertMessage:@"Please enter valid email address"]; 
      EmailTF.text=@""; 

     } 
    else if([pwdTF.text isEqual:comfTF.text]==NO) 
    { 
     [self showAlertMessage:@"password mismatch"]; 
     // userTf.text=@""; 
     comfTF.text=@""; 

    } 
    else 
    { 

      EmailTF.text=@""; 
      pwdTF.text=@""; 
      [user setObject:EmailTF.text forKey:@"username plist"]; 

      [user setObject:pwdTF.text forKey:@"password plist"]; 


      [user synchronize]; 
      [self showAlertMessage:@"You are REGISTERED now"]; 
      [viewobjsignup removeFromSuperview]; 



    } 



} 

//-(void)Registerclick 
//{ 
// UIAlertView *alertview1 = [[UIAlertView alloc]initWithTitle:@"Welcome" message:@"Your registration is successful..!" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil]; 
// [alertview1 show]; 
// [viewobjsignup removeFromSuperview]; 
//} 
// 
#pragma mark Validation Method 
-(BOOL)validateLoginScreen 
{ 
    if (emailTF.text.length==0) 
    { 
     [self showAlertMessage:@"Please enter email address"]; 
     return NO; 
    } 
    else if ([self emailValidation:emailTF.text]==NO) 
    { 
     [self showAlertMessage:@"Please enter valid email address"]; 
     return NO; 

    } 
    else if (passwordTF.text.length==0) 
    { 
     [self showAlertMessage:@"Please enter password "]; 
     return NO; 
    } 

    return YES; 
} 
-(void)showAlertMessage:(NSString *)msg 
{ 
    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Note" message:msg delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil]; 
    [alert show]; 
} 
-(BOOL) emailValidation:(NSString *)emailTxt 
{ 
    NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}"; 
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex]; 
    return [emailTest evaluateWithObject:emailTxt]; 

} 
#pragma mark TextField Delegates 
- (BOOL)textFieldShouldReturn:(UITextField *)textField 
{ 
// if(textField.tag==101) 
// { 
//  [passwordTF becomeFirstResponder]; 
// } 
// else if(textField.tag==102) 
// { 
//  [passwordTF resignFirstResponder]; 
// } 
    [currentTF resignFirstResponder]; 

    return YES; 



} 
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    [currentTF resignFirstResponder]; 
} 

-(void)textFieldDidBeginEditing:(UITextField *)textField 
{ 
    currentTF = textField; 
    [self animateTextField:textField up:YES]; 
} 

- (void)textFieldDidEndEditing:(UITextField *)textField 
{ 
    currentTF = textField; 

    [self animateTextField:textField up:NO]; 
} 

-(void)animateTextField:(UITextField*)textField up:(BOOL)up 
{ 
    int movementDistance = 0; // tweak as needed 

    if (textField.tag==105||textField.tag 
     ==106||textField.tag==107) 
    { 
     movementDistance = -130; 
    } 
    else 
    { 
     movementDistance = 00; 

    } 
    const float movementDuration = 0.3f; // tweak as needed 

    int movement = (up ? movementDistance : -movementDistance); 

    [UIView beginAnimations: @"animateTextField" context: nil]; 
    [UIView setAnimationBeginsFromCurrentState: YES]; 
    [UIView setAnimationDuration: movementDuration]; 
    self.view.frame = CGRectOffset(self.view.frame, 0, movement); 
    [UIView commitAnimations]; 
} 

- (void)didReceiveMemoryWarning 
{ 
    // Releases the view if it doesn't have a superview. 
    [super didReceiveMemoryWarning]; 

    // Release any cached data, images, etc that aren't in use. 
} 

- (void)viewDidUnload 
{ 
    [super viewDidUnload]; 
    // Release any retained subviews of the main view. 
    // e.g. self.myOutlet = nil; 
} 

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

Answer 4

Xamarin 5.10:

UIButton sampleButton1; 
    UITextField sampleTextField1; 
    UITextField sampleTextField2; 



    public void addUIButtonToView() 
      {   
       this.sampleButton1 = new UIButton (UIButtonType.RoundedRect); 
       sampleButton1.Frame = new CoreGraphics.CGRect (10f, 100f, 300f, 50f); 
       this.sampleButton1.SetTitle ("Sample Button", UIControlState.Normal); 
       this.sampleButton1.SetNeedsLayout(); 
       sampleButton1.TouchUpInside += OnSpeakButtonTapped; 

       this.View.AddSubview (sampleButton1); 
      } 

      void OnSpeakButtonTapped (object sender, EventArgs e) 
      { 
       // This is the event handler for the actual UIButton TouchUpInside event. 
       Console.WriteLine ("button tapped"); 
      } 

public void addUITextFieldToView() 
     { 
      //Initiate UITextField Delegates 
      sampleTextField1 = new UITextField(); 
      sampleTextField1.Frame = new CoreGraphics.CGRect (10f, 100f, 300f, 50f); 
      //sampleTextField1.Text = "This is Xamarin iOS TextField"; 
      sampleTextField1.BackgroundColor = UIColor.LightGray; 
      sampleTextField1.Alpha = 1.0f; 
      sampleTextField1.TextAlignment = UITextAlignment.Center; 
      sampleTextField1.Font = UIFont.FromName (name: "Arial", size: 15f); 

      sampleTextField1.Placeholder = "Enter text here"; 
      sampleTextField1.KeyboardType = UIKeyboardType.EmailAddress; 
      sampleTextField1.ReturnKeyType = UIReturnKeyType.Default; 
      sampleTextField1.MinimumFontSize = 17f; 
      sampleTextField1.AdjustsFontSizeToFitWidth = true; 

      //Additional 
      sampleTextField2 = new UITextField(); 
      sampleTextField2.Frame = new CoreGraphics.CGRect (this.View.Frame.X + 5, this.View.Frame.Y + 250, this.View.Frame.Width - 10, this.View.Frame.Height/3); 
      sampleTextField2.BackgroundColor = UIColor.FromPatternImage (UIImage.FromFile ("Real-Estate_4.jpg")); 
      sampleTextField2.AdjustsFontSizeToFitWidth = true; 
      sampleTextField2.MinimumFontSize = 12f; 

      //Setting Boarder and curved edges 
      sampleTextField2.Layer.BorderWidth = 1f; 
      sampleTextField2.Layer.CornerRadius = 5f; 
      sampleTextField2.Layer.BorderColor = UIColor.Black.CGColor; 

      //Shadows 
      sampleTextField2.Layer.ShadowColor = UIColor.DarkGray.CGColor; 
      sampleTextField2.Layer.ShadowOffset = new CoreGraphics.CGSize (3f, 3f); 
      sampleTextField2.Layer.ShadowOpacity = 0.3f; 
      sampleTextField2.Layer.ShadowRadius = 3f; 

      this.View.AddSubview (sampleTextField1); 
      this.View.AddSubview (sampleTextField2); 

      //Adding Delegate Methods 
      this.enableUITextFieldDelegateMethods(); 

     } 
void enableUITextFieldDelegateMethods() 
     { 
      this.sampleTextField1.ShouldReturn += (textField) => { 
       sampleTextField2.BecomeFirstResponder(); 
       textField.ResignFirstResponder(); 
       return true; 
      }; 

      this.sampleTextField1.ShouldBeginEditing += (textField) => { 
       //Write here 
       return true; 
      }; 

      this.sampleTextField1.ShouldEndEditing += (textField) => { 
       //Write here 
       return true; 
      }; 
      this.sampleTextField1.ShouldClear += (textField) => { 
       //Write here 
       return true; 
      }; 

      this.sampleTextField1.ShouldChangeCharacters = (UITextField txt, NSRange range, string sampleTxt) => { 
       var newLength = txt.Text.Length + sampleTxt.Length - range.Length; 
       return newLength <= 9; 

      }; 
     }