在顯示ARC上的UIKeyboard時發生內存泄漏

調用UIKeyboard時，當隱藏UIKeyboard時，將分配內存並不釋放內存。如果是緩存的框架，有什麼方法可以清除它？這些代碼是我用來創建UITextField，我怎麼隱藏UIKeyboard：在顯示ARC上的UIKeyboard時發生內存泄漏

#import <UIKit/UIKit.h> 

    @interface SignInTextField : UITextField 

    -(id)initWithIndexPath:(NSIndexPath*)indexPath; 

    @end 

    #import "SignInTextField.h" 

    @implementation SignInTextField 

    -(id)initWithIndexPath:(NSIndexPath*)indexPath{ 
     self = [super init]; 
     if (self) { 
      if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) { 
       // iPad 
       self.frame = CGRectMake(110, 10, 600, 30); 
      } else { 
       self.frame = CGRectMake(110, 11, 150, 30); 
      } 

      self.tag = [indexPath row]; 
      self.returnKeyType = UIReturnKeyDone; 
      self.autocapitalizationType = UITextAutocapitalizationTypeNone; 
     } 
     return self; 
    } 

    //SettingTextField 
    SignInTextField *textField = [[SignInTextField alloc]initWithIndexPath:indexPath]; 
    textField.delegate = self; 

    #pragma mark - Text Field CallBack 
    -(void)textFieldDidBeginEditing:(UITextField *)textField{ 
     activeField = textField; 
    } 

    - (void)textFieldDidEndEditing:(UITextField *)textField { 

     if(textField.tag == 0) temp_email = [NSString   stringWithFormat:@"%@",textField.text]; 
     if(textField.tag == 1) temp_password = [NSString stringWithFormat:@"%@",textField.text]; 
    } 

    - (BOOL)textFieldShouldReturn:(UITextField *)textField { 
     [textField resignFirstResponder]; 
     return YES; 
    }

This is leak point.