Question

Im having this problem for weeks already. because my app needs a function that will create a UITextfield, undo, and delete the UITexfield. my code create textfield anywhere on the view when you tap it. and it also can undo the last textfield that been created when pressed button undo, it can be move, scale, rotate also, but after i created another new textfield, the old one was been attached to the view. that is why when i long pressed the old textfield, it can be deleted only the new one that was been created can be delete. what will i do how to make that old textfield deleted?here my code.

ViewController.h

#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>


@interface ViewController : UIViewController<UITextFieldDelegate, UIGestureRecognizerDelegate>
{

    NSMutableArray *textfieldform;//array for textfield
    UITextField *textField1;//a textfield
    CGPoint prevPanPoint;// float for moving the textfield anywhere
    float prevPinchScale;// float for pinching the textfield
    float prevRotation;// float for rotating the textfield
}


@property (nonatomic, retain) NSMutableArray *textfieldform;//array for creating multiple textfield


-(IBAction) undo;
- (IBAction)handleTap2:(UITapGestureRecognizer *)recognizer;
-(IBAction)panGestureAction:(UIPanGestureRecognizer *)pan;
- (IBAction)scaleImage:(UIPinchGestureRecognizer *)recognizer;
- (IBAction)rotateImage:(UIRotationGestureRecognizer *)recognizer;
@end

ViewController.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

@synthesize textfieldform;
- (void)viewDidLoad{
    [super viewDidLoad];
    //textfieldform = [[NSMutableArray alloc] init];
  // Do any additional setup after loading the view, typically from a nib.
    textfieldform = [NSMutableArray arrayWithCapacity:0];//array of the textfield
}
//connected to the self.view
-(IBAction) longPressGesture:(UIGestureRecognizer*)gesture{
    [textfieldform removeObject:textField1];
    [textField1 removeFromSuperview];
    NSLog(@"baaaaaaam!");
}
//make the textfield move to any direction in the self.view
-(IBAction)panGestureAction:(UIPanGestureRecognizer *)pan {
    CGPoint translation = [pan translationInView:self.view];
    textField1.transform = CGAffineTransformTranslate(textField1.transform, translation.x, translation.y);
    [pan setTranslation:CGPointZero inView:self.view]; 
}

//to make the use of gesture simultaneously within the view
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    return YES;
}
//to make the use of gesture simultaneously
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
    if([touch.view isKindOfClass:[UIControl class]]) {
        return YES;
    }
    return NO;
}
//to pinch the textfield using 2 fingers.
- (IBAction)scaleImage:(UIPinchGestureRecognizer *)recognizer{

    textField1.transform = CGAffineTransformScale(textField1.transform, recognizer.scale, recognizer.scale);
    recognizer.scale = 1;
}
//to rotate the textfield using 2 fingers
- (IBAction)rotateImage:(UIRotationGestureRecognizer *)recognizer{
    textField1.transform = CGAffineTransformRotate(textField1.transform, recognizer.rotation);
    recognizer.rotation = 0;
}
//to remove the last textfield that was been created
-(IBAction)undo{
    UITextField *textFieldToRemove = [textfieldform lastObject];
    if (textFieldToRemove) {
        [textfieldform removeObject:textFieldToRemove];
        [textFieldToRemove removeFromSuperview];
    }

}
// for the editing of the textfield 
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{ 

    NSLog(@"textFieldShouldBeginEditing");
    return YES;
}
- (void)textFieldDidBeginEditing:(UITextField *)textField{           

    NSLog(@"textFieldDidBeginEditing");
    [textField1  setBackgroundColor:[UIColor colorWithRed:(248/255.0) green:(248/255.0) blue:(255/255.0) alpha:1.0]];
    textField1.borderStyle = UITextBorderStyleRoundedRect;
}
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField{

    NSLog(@"textFieldShouldEndEditing");
    textField.backgroundColor = [UIColor clearColor];
    return YES;
}
- (void)textFieldDidEndEditing:(UITextField *)textField{

    NSLog(@"textFieldDidEndEditing");
    [textField1  setBackgroundColor:[UIColor clearColor]];
    textField1.borderStyle = UITextBorderStyleNone;
}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{

    NSLog(@"textField:shouldChangeCharactersInRange:replacementString:");

    if ([string isEqualToString:@"#"]) {
        return NO;
    }
    else {
        return YES;
    }

}
- (BOOL)textFieldShouldClear:(UITextField *)textField{

    NSLog(@"textFieldShouldClear:");
    return YES;
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField{
    NSLog(@"textFieldShouldReturn:");
    if (textField.tag == textfieldform.count) {
        textField1 = (UITextField *)[self.view viewWithTag:textfieldform.count];
        [textField1 becomeFirstResponder];
    }
    else {
        [textField resignFirstResponder];
    }
    return YES;
}
//when tap the user can create a textfield on any direction, it create many different textfield. according to how many tap you do on the view
- (IBAction)handleTap2:(UITapGestureRecognizer *)recognizer{
    if (recognizer.state == UIGestureRecognizerStateEnded){
        CGPoint point = [recognizer locationInView:[self view]];
        textField1 = [[UITextField alloc] init];
        textField1.borderStyle = UITextBorderStyleLine;
        [textField1 setAdjustsFontSizeToFitWidth:YES];
        [textField1 setText:@"TextField"];
        CGRect frame ;    
        frame.origin.x = point.x;
        frame.origin.y = point.y; 
        frame.size.width=200;
        frame.size.height=40;
        textField1.frame=frame;
        textField1.autocorrectionType = UITextAutocorrectionTypeNo;
        textField1.keyboardType = UIKeyboardTypeDefault;
        textField1.returnKeyType = UIReturnKeyDefault;
        textField1.clearButtonMode = UITextFieldViewModeWhileEditing;
        textField1.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;    
        textField1.delegate = self;
        textField1.tag = textfieldform.count;
        [textfieldform addObject:textField1];
        [self.view addSubview:textField1];
        [textField1 setAdjustsFontSizeToFitWidth:YES];
    }

}

- (void)viewDidUnload{
    [super viewDidUnload];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation{
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

Answer 1

You are using wrong method DoAction as selector, instead use LongPressgesture method

Update your code like following:

- (void)viewDidLoad{
    [super viewDidLoad];

    textfieldform = [[NSMutableArray alloc] init];
    textField1  = ... // Initialize textfield

    UILongPressGestureRecognizer *holdRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(LongPressgesture:)];
    [holdRecognizer setMinimumPressDuration:2];
    [holdRecognizer setDelegate:self];
    [textField1 addGestureRecognizer:holdRecognizer];
}

- (void)LongPressgesture:(UILongPressGestureRecognizer *)recognizer
{
    if (recognizer.state == UIGestureRecognizerStateEnded) {
        //[textfieldform removeObject: recognizer.view];
        [recognizer.view removeFromSuperview];

        NSLog(@"Long press Ended .................");
    }
    else {
        NSLog(@"Long press detected .....................");
    }        
}