iphone - My UITextView makes my App crash when back button is pressed to get back to the menu in Xcode -


this code have in .h 

@interface notebook : uiviewcontroller {  iboutlet uitextview *textview;  //loads "data saved" message after save button hit iboutlet uilabel *loaded; }  //database actions  - (ibaction)save:(id)sender;   @end

and here code in .m

@implementation notebook {  }  //saves loaded data  - (ibaction)save:(id)sender {  //first save string nsstring *savestring = textview.text; nsuserdefaults *defaults = [nsuserdefaults standarduserdefaults]; [defaults setobject:savestring forkey:@"savestring"]; [defaults synchronize];  //shows saved data message loaded.text = @"data saved";  }   - (void)viewdidload {     [super viewdidload];      //automatically loads data on re-enter of screen     nsuserdefaults *defaults = [nsuserdefaults standarduserdefaults];     nsstring *loadstring = [defaults objectforkey:@"savestring"];     [textview settext:loadstring];       // additional setup after loading view nib.  }  - (void)touchesbegan:(nsset *)touches withevent:(uievent *)event {  uitouch *touch = [[event alltouches] anyobject]; if ([textview isfirstresponder] && [touch view] != textview) {     [textview resignfirstresponder]; } [super touchesbegan:touches withevent:event]; }  - (void)didreceivememorywarning { [super didreceivememorywarning]; // dispose of resources can recreated. }  @end


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