iOS开发——抽屉效果实现

抽屉效果的原理：其实就是把两个子控制器添加到一个RootViewController中，将子控制器的view添加到RootViewController的view上，然后改变子控制器view的frame实现抽屉的效果。
下面直接看看我自己写的一个小demo。

RootViewController.h

//两个子控制器leftView和midView@property(nonatomic,weak)UIViewController *leftView;@property(nonatomic,weak)UIViewController *midView;

RootViewController.m

- (void)viewDidLoad {    [super viewDidLoad];    //将leftView和midView添加到self中作为子控制器。将他们的view添加到self.view中    [self addChildViewController:self.leftView];    [self.view addSubview:self.leftView.view];    [self addChildViewController:self.midView];    [self.view addSubview:self.midView.view];    //设置一个按钮点击实现抽屉效果    UIButton *leftButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];    leftButton.frame = CGRectMake(0, 50, 150, 150);    [leftButton addTarget:self action:@selector(leftButtonPressed) forControlEvents:UIControlEventTouchUpInside];    [leftButton setTitle:@"left" forState:UIControlStateNormal];    [self.midView.view addSubview:leftButton];}-(void)leftButtonPressed{    //判断抽屉是否是展开状态    if (self.midView.view.frame.origin.x == 0) {        //通过动画实现view.fram的改变        [UIView animateWithDuration:0.3 animations:^{            /*  W  H  屏幕实际大小宏             * #define ScreenWidth [UIScreen mainScreen].bounds.size.width             * #define ScreenHeight [UIScreen mainScreen].bounds.size.height            */            self.leftView.view.frame = CGRectMake(0, 0, W, H);            self.midView.view.frame = CGRectMake(200, 50, W, H-50*2);        } completion:^(BOOL finished) {        }];    }else{        [UIView animateWithDuration:0.3 animations:^{            self.midView.view.frame = CGRectMake(0, 0, W, H);        } completion:^(BOOL finished) {        }];    }}

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];    LeftViewController *leftView = [[LeftViewController alloc] init];    MidViewController *midView = [[MidViewController alloc]init];    RootViewController *rootView = [[RootViewController alloc]init];    rootView.leftView = leftView;    rootView.midView = midView;    self.window.rootViewController = rootView;    [self.window makeKeyAndVisible];    return YES;}

运行代码，效果图如下：