IOS项目开发-密码生成器

PasswordGenerator

12/23/2014 4:45:15 PM. by Arbboter###

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概要

通过仿密码生成器软件，练习IOS开发技术，加深对MVC设计模式的理解，对以前学习的点点滴滴复习+掌握。因为看到的例子是用拖拉界面实现的，
而为了实现和更好地学习IOS开发，我采用纯编码的方式来开发，所以相对拖拉会比较慢。例子里面虽然有专门的布局方法，但是没有处理屏幕方向发生变化时的事件，所以横屏还是有问题的。此外，对于每个界面都有一个对应的控制类，在UIView类里面实现UI元素的添加布局，在控制器里面实现事件、逻辑的处理，以便符合MVC的设计模式。

结果展示

主要技术点

• 程序主要有两个界面：主页面(MainView)和帮助页面(InfomationView),这两个视图都是以程序的子视图的方式显示，两者互斥出现

• 在主页面显示的时候，程序的根视图有一个信息按钮，通过该按钮可导航到帮助页面，而在帮助页面时，程序的根视图顶部有一个导航栏，通过导航栏的左右按钮都可以返回到主页面。

• 页面切换时的动画采用UIView动画，其基本用法形如下所示：

    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:1.0f];
    [UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view cache:YES];
    [self removeMainView];
    [UIView commitAnimations];
  

• 一个UINavigationItem分为三部分：左按钮,标题文字,右按钮，主要用法形如：

    UINavigationBar* bar = [[UINavigationBar alloc] init];
    [self.view insertSubview:bar aboveSubview:self.infomationViewController.view];
    
    UINavigationItem* item = [[UINavigationItem alloc] initWithTitle:@"About Password Generator"];
    [bar pushNavigationItem:item animated:YES];
    
    UIBarButtonItem* leftBarButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStylePlain target:self action:@selector(SwitchView)];
    UIBarButtonItem* rightBarButton = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStylePlain target:self action:@selector(SwitchView)];
    
    item.leftBarButtonItem = leftBarButton;
    item.rightBarButtonItem = rightBarButton;
  

• 由于UIView的类里面初始化的时候只是添加了控件，而没有对控件的布局进行初始化，而布局初始化又是类方法里面的reLayout，所以为了保证显示前能够正确调用布局，我在视图对应类的控制器类里面重写了方法- (void) viewWillAppear:(BOOL)animated,在该方法里面调用了布局方法，如下所示：

    - (void) viewWillAppear:(BOOL)animated
    {
        if(self.autolayout)
        {
            [self.view reLayout];
        }
        [super viewWillAppear:animated];
    }
  

• 由于经验不够，本来想想就能完成的事情做起来还是出现乱七八糟的问题，首先昨晚花了一个多小时一直写代码，然后测试，居然没有画面。调了下，不知道是什么原因。然后今天新建了个工程，一边写，一边看效果，零零散散，总算完成了。看来..不能一口吃成胖子，也不能光说不练。

主要代码

1. 程序主控制器

    //
    //  ViewController.m
    //  PasswordGenerator
    //
    //  Created by arbboter on 14/12/23.
    //  Copyright (c) 2014ๅนด arbboter. All rights reserved.
    //
    
    #import "ViewController.h"
    #import "MainViewController.h"
    #import "InfomationViewController.h"
    
    @interface ViewController ()
    
    @property(nonatomic, retain) UIButton* infomationButton;
    @property(nonatomic, retain) MainViewController* mainViewController;
    @property(nonatomic, retain) InfomationViewController* infomationViewController;
    @property (nonatomic, retain) UINavigationBar* navagationBar;
    @end
    
    @implementation ViewController
    
    - (void)viewDidLoad
    {
        [super viewDidLoad];
        // Do any additional setup after loading the view, typically from a nib.
        
        [self SwitchView];
    }
    
    - (void) onInfomationView
    {
       
        InfomationViewController* viewController = [[InfomationViewController alloc] init];
        self.infomationViewController = viewController;
        [self.view addSubview:viewController.view];
        [viewController release];
        
        UINavigationBar* bar = [[UINavigationBar alloc] init];
        [self.view insertSubview:bar aboveSubview:self.infomationViewController.view];
        self.navagationBar = bar;
        [bar release];
        
        UINavigationItem* item = [[UINavigationItem alloc] initWithTitle:@"About Password Generator"];
        [bar pushNavigationItem:item animated:YES];
        UIBarButtonItem* leftBarButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStylePlain target:self action:@selector(SwitchView)];
        UIBarButtonItem* rightBarButton = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStylePlain target:self action:@selector(SwitchView)];
        
        item.leftBarButtonItem = leftBarButton;
        item.rightBarButtonItem = rightBarButton;
        
        [item release];
        [leftBarButton release];
        [rightBarButton release];
    }
    
    - (void) removeInfomationView
    {
        [_infomationViewController.view removeFromSuperview];
        [_infomationViewController release];
        _infomationViewController = nil;
        
        [_navagationBar removeFromSuperview];
        [_navagationBar release];
        _navagationBar = nil;
    
    }
    
    - (void) SwitchView
    {
        [UIView beginAnimations:nil context:nil];
        [UIView setAnimationDuration:1.0f];
        
        if ([self.infomationButton superview])
        {
            [UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view cache:YES];
            [self removeMainView];
            [UIView commitAnimations];
            [self onInfomationView];
        }
        else
        {
            [UIView setAnimationTransition:UIViewAnimationTransitionCurlDown forView:self.view cache:YES];
            [self removeInfomationView];
            [UIView commitAnimations];
            [self onMainView];
        }
        [self reLayout];
    }
    
    - (void) removeMainView
    {
        [_infomationButton removeFromSuperview];
        [_infomationButton release];
        _infomationButton = nil;
        [_mainViewController.view removeFromSuperview];
        [_mainViewController release];
        _mainViewController = nil;
    }
    
    - (void) onMainView
    {
        UIButton* button = [UIButton buttonWithType:UIButtonTypeInfoDark];
        [self.view addSubview:button];
        [button addTarget:self action:@selector(SwitchView) forControlEvents:UIControlEventTouchUpInside];
        self.infomationButton = button;
        
        MainViewController* viewController = [[MainViewController alloc] init];
        [self.view insertSubview:viewController.view belowSubview:self.infomationButton];
        self.mainViewController = viewController;
        [viewController release];
    }
    
    - (void) reLayout
    {
        CGPoint origin = self.view.frame.origin;
        CGSize size = self.view.frame.size;
        
        CGFloat w = 40;
        CGFloat h = 40;
        CGFloat yMargin = 10;
        CGFloat xMargin = 10;
        CGFloat x = origin.x + size.width-2*xMargin-w;
        CGFloat y = origin.y + size.height - 2*yMargin - h;
        
        _navagationBar.frame = CGRectMake(origin.x, origin.y+20, size.width, 40);
        _infomationButton.frame = CGRectMake(x, y, w, h);
    }
    
    -(void) viewWillAppear:(BOOL)animated
    {
        [self reLayout];
        [super viewWillAppear:animated];
    }
    
    - (void)didReceiveMemoryWarning
    {
        [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
    }
    
    - (void) dealloc
    {
        [self removeInfomationView];
        [self removeMainView];
        [super dealloc];
    }
    
    @end
   

2. 帮助页面视图类

    //
    //  InfomationView.m
    //  PasswordGenerator
    //
    //  Created by arbboter on 14/12/23.
    //  Copyright (c) 2014年 arbboter. All rights reserved.
    //
    
    #import "InfomationView.h"
    
    @interface InfomationView ()
    
    @property (nonatomic, retain) UILabel* logoLabel;
    @property (nonatomic, retain) UIImageView* bkImageView;
    
    @end
    
    @implementation InfomationView
    
    - (id)init
    {
        self = [super init];
        if(self == nil)
        {
            return self;
        }
        
        UILabel* label = nil;
        label = [[UILabel alloc] init];
        label.text = @"Copyright (c) 2014年 arbboter.";
        label.textAlignment = NSTextAlignmentCenter;
        self.logoLabel = label;
        [self addSubview:label];
        [label release];
        
        UIImageView* imageView = [[UIImageView alloc] init];
        imageView.image = [UIImage imageNamed:@"bk.jpg"];
        imageView.contentMode = UIViewContentModeScaleAspectFit;
        self.bkImageView = imageView;
        [self insertSubview:imageView belowSubview:self.logoLabel];
        [imageView release];
        
        return self;
    }
    
    - (void) reLayout
    {
        CGPoint origin = self.frame.origin;
        CGSize size = self.frame.size;
        
        CGFloat yMargin = 10;
        CGFloat xMargin = 10;
        CGFloat w = size.width-2*xMargin;
        CGFloat h = 40;
        CGFloat x = origin.x + xMargin;
        CGFloat y = origin.y + size.height - 2*yMargin - h;
        
        _bkImageView.frame = self.frame;
        _logoLabel.frame = CGRectMake(x, y, w, h);
    
    }
    
    - (void) dealloc
    {
        [_bkImageView release];
        [_logoLabel release];
        [super dealloc];
    }
    @end
   

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