这是首次在课上遇到完整的app，对这个app的设计步骤准备作为以后自己做project时候的参考。

课题

猜城市.png

• step1：需求分析

需求分析.png

• step2：分析设计

  
  
  分析设计.png

• step3：程序设计

程序设计.png

• step4：代码结构

代码结构.png

键盘的显示问题

我写了一个类，不知道思路对不对

• .h文件
  // keyboardEvents.h
  #import <UIKit/UIKit.h>
  @interface keyboardEvents : UIViewController<UITextFieldDelegate>
  -(void)moveView:(float)move;
  @end

• .m文件
  // keyboardEvents.m
  #import "keyboardEvents.h"
  @interface keyboardEvents ()
  @end
  int textFieldY;
  @implementation keyboardEvents
  #pragma mark - Keyboard Events
  -(void)textFieldDidBeginEditing:(UITextField *)textField{
  textFieldY = textField.frame.origin.y;
  }

  -(void)textFieldDidEndEditing:(UITextField *)textField{
      int offset = 0;
      [self moveView:offset];
      [UIView commitAnimations];
  }
  
  -(BOOL)textFieldShouldReturn:(UITextField *)textField
  {
     NSTimeInterval animationDuration = 0.30f;
    [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
    [UIView setAnimationDuration:animationDuration];
    CGRect rect = CGRectMake(0.0f, 0.0f, self.view.frame.size.width, self.view.frame.size.height);
    self.view.frame = rect;
    [UIView commitAnimations];
    [textField resignFirstResponder];
    return YES;
  }
  
  - (void) registerForKeyboardNotifications
  {
      [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(KeyboardWillShowNotification:) name:UIKeyboardWillShowNotification object:nil];
  }
  
  - (void) KeyboardWillShowNotification:(NSNotification *) notif
  {
      NSDictionary *info = [notif userInfo];
      NSValue *value = [info objectForKey:UIKeyboardFrameEndUserInfoKey];
      CGFloat keyboardY = [value CGRectValue].origin.y;
  
      if (textFieldY > keyboardY -60 ){
          int offset =  ( keyboardY - 60 ) - textFieldY ;
          [self moveView:offset];
          [UIView commitAnimations];
      }
  }
  
  -(void)moveView:(float)move{
      NSTimeInterval animationDuration = 0.30f;
      CGRect frame = self.view.frame;
      frame.origin.y = 0;
      frame.origin.y +=move;
      self.view.frame = frame;
      [UIView beginAnimations:@"ResizeView" context:nil];
      [UIView setAnimationDuration:animationDuration];
      self.view.frame = frame;
      [UIView commitAnimations];
  }
  
  #pragma mark - View Lifecycle
  - (void)viewDidLoad {
      [super viewDidLoad];
      [self registerForKeyboardNotifications];
  }
  
  - (void)didReceiveMemoryWarning {
      [super didReceiveMemoryWarning];
      [[NSNotificationCenter defaultCenter]removeObserver:self];
  }
  @end