通用方法解决UITextFiled输入的时候，键盘遮挡问题

- (void)moveView:(UITextField *)textField leaveView:(BOOL)leave  
{  
    UIView *accessoryView = textField.inputAccessoryView;  
    UIView *inputview     = textField.inputView;  
      
    int textFieldY = 0;  
    int accessoryY = 0;  
    if (accessoryView && inputview)   
    {  
        CGRect accessoryRect = accessoryView.frame;  
        CGRect inputViewRect = inputview.frame;  
        accessoryY = 480 - (accessoryRect.size.height + inputViewRect.size.height);  
    }  
    else if (accessoryView)  
    {  
        CGRect accessoryRect = accessoryView.frame;  
        accessoryY = 480 - (accessoryRect.size.height + 216);  
    }  
    else if (inputview)  
    {  
        CGRect inputViewRect = inputview.frame;  
        accessoryY = 480 -inputViewRect.size.height;  
    }  
    else  
    {  
        accessoryY = 264; //480 - 216;  
    }  
      
      
    CGRect textFieldRect = textField.frame;  
    textFieldY = textFieldRect.origin.y + textFieldRect.size.height + 20;  
      
    int offsetY = textFieldY - accessoryY;  
    if (!leave && offsetY > 0)   
    {  
        int y_offset = -5;  
          
        y_offset += -offsetY;  
          
        CGRect viewFrame = self.view.frame;  
          
        viewFrame.origin.y += y_offset;  
          
        [UIView beginAnimations:nil context:NULL];  
        [UIView setAnimationBeginsFromCurrentState:YES];  
        [UIView setAnimationDuration:0.3];  
        [self.view setFrame:viewFrame];  
        [UIView commitAnimations];  
    }  
    else  
    {  
        CGRect viewFrame = CGRectMake(0, 20, 320, 460);  
          
        [UIView beginAnimations:nil context:NULL];  
        [UIView setAnimationBeginsFromCurrentState:YES];  
        [UIView setAnimationDuration:0.3];  
        [self.view setFrame:viewFrame];  
        [UIView commitAnimations];  
    }  
} 

　　

- (void)textFieldDidBeginEditing:(UITextField *)textField  
{  
        [self moveView:textField leaveView:NO];  
}  
  
- (void)textFieldDidEndEditing:(UITextField *)textField;  
{  
    [self moveView:textField leaveView:YES];  
}