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包含文件

• MainViewController.h, MainViewController.m

实现功能

1、设置导航模式的核心页面为MainWindows

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    ...
    LeftMenuViewController *leftMenuVC = [[LeftMenuViewController alloc] initWithNibName:@"LeftMenuViewController" bundle:[NSBundle mainBundle]];
    HomeViewController *homeVC = [[HomeViewController alloc] initWithViewModel:[HomeViewModel new]];
    _mainVC = [[MainViewController alloc] initWithLeftMenuViewController:leftMenuVC andHomeViewController:homeVC];
    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:_mainVC]
    self.window.rootViewController = navigationController;
    ...
}

2、将appdelegate里面创建的LeftMenuViewController对象和HomeViewController的对象传给MainViewController

@property(strong,nonatomic) HomeViewController *homeViewController;
@property(strong,nonatomic) LeftMenuViewController *leftMenuViewController;
@property(assign,nonatomic) CGFloat distance;
@property(strong,nonatomic) UIView *leftMenuView;
@property(strong,nonatomic) UIView *mainView;

- (instancetype)initWithLeftMenuViewController:(LeftMenuViewController *)menuVC andHomeViewController:(HomeViewController *)homeVC {
    self = [super init];
    if (self) {
        self.homeViewController = homeVC;
        self.leftMenuViewController = menuVC;
    }
    return self;
}

3、在MainViewController加载完毕以后,

• 记录当前的拖动量_distance
• 设置leftMenuViewController.view的frame为全屏，位置转化为不可见，添加到MainViewController的view中
• 设置_homeViewController.view为全屏，并添加到MainViewController的view中
• 为_mainView添加pan手势
• 初始化tap手势，为后面的程序使用

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    _distance = MainViewOriginXFromValue;

    _leftMenuView = _leftMenuViewController.view;
    _leftMenuView.frame = kScreenBounds;
   =CGAffineTransformConcat(CGAffineTransformScale(CGAffineTransformIdentity, LeftViewScaleFromValue, LeftViewScaleFromValue), CGAffineTransformTranslate(CGAffineTransformIdentity, LeftViewOriginXFromValue, 0));
    [self.view addSubview:_leftMenuView];

    _mainView = [[UIView alloc] initWithFrame:kScreenBounds];
    [self.view addSubview:_mainView];
    [_mainView addSubview:_homeViewController.view];
    //上面代码创建一个UIView出来好像没有用，直接下面的代码也行：
    //_mainView = _homeViewController.view
    //[self.view addSubview:_mainView];

    UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(pan:)];
    [_mainView addGestureRecognizer:panGesture];

    _tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tap:)];

}

4、手势事件

• 点击手势
  • 显示MainView。

- (void)tap:(UITapGestureRecognizer *)recongizer {
    [self showMainView];
}

• 拖动手势
  • 计算拖动量
  • 拖动过程中，根据拖动量移动_leftMenuView和_mainView
  • 拖动完成时，根据最终偏移量，显示_mainView或者_leftMenuView

- (void)pan:(UIPanGestureRecognizer *)recongnizer {

    CGFloat moveX = [recongnizer translationInView:self.view].x;
    CGFloat truedistance = _distance + moveX;
    CGFloat percent = truedistance/MainViewMoveXMaxValue;
    if (truedistance >= 0 && truedistance <= MainViewMoveXMaxValue) {
        _mainView.transform = CGAffineTransformConcat(CGAffineTransformScale(CGAffineTransformIdentity, 1, MainViewScaleYFromValue-MainViewScaleMaxValue*percent), CGAffineTransformTranslate(CGAffineTransformIdentity, MainViewOriginXFromValue+truedistance, 0));
        _leftMenuView.transform = CGAffineTransformConcat(CGAffineTransformScale(CGAffineTransformIdentity, LeftViewScaleFromValue+LeftViewScaleMaxValue*percent, LeftViewScaleFromValue+LeftViewScaleMaxValue*percent), CGAffineTransformTranslate(CGAffineTransformIdentity, LeftViewOriginXFromValue+LeftViewMoveXMaxValue*percent, 0));
    }
    if (recongnizer.state == UIGestureRecognizerStateEnded) {
        if (truedistance <= MainViewMoveXMaxValue/2) {
            [self showMainView];
        }else{
            [self showLeftMenuView];
        }
    }   
}

5、显示页面函数如下

• 动画显示移动过程（_mainView， _leftMenuView）
• 动画完成后，记录偏移量，并添加（移除）偏移量

- (void)showMainView {
    [UIView animateWithDuration:AnimateDuration delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
        _mainView.transform = CGAffineTransformIdentity;
        _leftMenuView.transform = CGAffineTransformConcat(CGAffineTransformScale(CGAffineTransformIdentity, LeftViewScaleFromValue, LeftViewScaleFromValue), CGAffineTransformTranslate(CGAffineTransformIdentity, LeftViewOriginXFromValue, 0));
    } completion:^(BOOL finished) {
        _distance = MainViewOriginXFromValue;
        [_mainView removeGestureRecognizer:_tap];
    }];
}

- (void)showLeftMenuView {
    [UIView animateWithDuration:AnimateDuration delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
        _mainView.transform = CGAffineTransformConcat(CGAffineTransformScale(CGAffineTransformIdentity, 1, MainViewScaleYEndValue), CGAffineTransformTranslate(CGAffineTransformIdentity, MainViewOriginXEndValue, 0));
        _leftMenuView.transform = CGAffineTransformIdentity;
    } completion:^(BOOL finished) {
        _distance = MainViewOriginXEndValue;
        [_mainView addGestureRecognizer:_tap];
    }];
}