UITextField crashes when .hidden=NO;

[TrueScot]

When I use a UITextField to get input for placement in a UIPickerView it works fine unless I select a row in the pickerview first. The UITextField is hidden and a button needs to be pressed to unhide it to allow the user to enter something. If the user simply presses the button the UITextfield is unhidden with hidden=NO, and the field and keyboard appears, gets the input and puts it into the pickerview and hides the keyboard again without any problem. However, if I scroll through the pickerview first, then hit the button to input to the UITextField, the app crashes at the UITextField.hidden=NO; statement with the message -

'[NSCFString setHidden:] unrecognised selector sent to instance'.

It only happens when the pickerview has been used first ie. when the UITextField is not empty. I've tried to initialize the UITextField in the IBAction before getting the input but it makes no difference.

Any suggestions would be very helpful. Thanks.

[Domele]

Post how/where you are creating the textfield and how/where you are hiding it.

[TrueScot]

Originally Posted by Domele

Post how/where you are creating the textfield and how/where you are hiding it.

The UITextField is created in IB and is set to hidden. It is then connected to

.h

UIPickerView *pickerView;
IBOutlet UILabel *healthType;
IBOutlet UITextField *projectName;
IBOutlet UIImageView *projectNameMask;
IBOutlet UILabel *projectNameLabel;
IBOutlet UITextView *instructions;
IBOutlet NSString *alertString;


}
@property (retain, nonatomic) UIPickerView *pickerView;
@property (nonatomic, retain) UILabel *healthType;
@property (retain, nonatomic) UITextField *projectName;
@property (retain, nonatomic) UIImageView *projectNameMask;
@property (retain, nonatomic) UITextView *instructions;
@property (retain, nonatomic) UILabel *projectNameLabel;
@property (retain, nonatomic) NSString *alertString;


.m

@synthesize pickerView;
@synthesize healthType;
@synthesize projectName;
@synthesize projectNameMask;
@synthesize instructions;
@synthesize projectNameLabel;
@synthesize alertString;


// SHOW HIDDEN TEXTFIELD AND CREATE PROJECT
-(IBAction) createProject: (id) sender {

// Show field for entry of Project Name

[pickerView removeFromSuperview];
projectNameMask.hidden =NO;
projectNameLabel.hidden =NO;
projectName.hidden =NO;
instructions.hidden =YES;

}

[BrianSlick]

Smells like a memory management problem. It's not in the code you have shown.

[ngaikwad]

Originally Posted by TrueScot

The UITextField is created in IB and is set to hidden. It is then connected to

.h

UIPickerView *pickerView;
IBOutlet UILabel *healthType;
IBOutlet UITextField *projectName;
IBOutlet UIImageView *projectNameMask;
IBOutlet UILabel *projectNameLabel;
IBOutlet UITextView *instructions;
IBOutlet NSString *alertString;


}
@property (retain, nonatomic) UIPickerView *pickerView;
@property (nonatomic, retain) UILabel *healthType;
@property (retain, nonatomic) UITextField *projectName;
@property (retain, nonatomic) UIImageView *projectNameMask;
@property (retain, nonatomic) UITextView *instructions;
@property (retain, nonatomic) UILabel *projectNameLabel;
@property (retain, nonatomic) NSString *alertString;


.m

@synthesize pickerView;
@synthesize healthType;
@synthesize projectName;
@synthesize projectNameMask;
@synthesize instructions;
@synthesize projectNameLabel;
@synthesize alertString;


// SHOW HIDDEN TEXTFIELD AND CREATE PROJECT
-(IBAction) createProject: (id) sender {

// Show field for entry of Project Name

[pickerView removeFromSuperview];
projectNameMask.hidden =NO;
projectNameLabel.hidden =NO;
projectName.hidden =NO;
instructions.hidden =YES;

}

are you join the ibooutlet to interface

[TrueScot]

Sorted. The row from the pickerview component was being used as an index to an NSMutableArray to retrieve a string to be used elsewhere. A ".text" was missing from the UILabel (nothing to do with the UITextField) and this caused it to crash.

Thanks for input everyone.