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抽屉效果
所谓抽屉效果就是三个视图,向右拖拽显示左边的视图,向左拖拽显示右边的视图,当拖拽大于屏幕的一半时最上面的视图会自动定位到一边,当点击左边或右边视图时会最上面视图会自动复位。
效果如图:三个视图(左边:浅灰色视图、右边:品红视图、主视图:黑色视图)
封装代码
DrawerViewController
#import <UIKit/UIKit.h> @interface DrawerViewController : UIViewController @property (weak, nonatomic, readonly) UIView *leftView; @property (weak, nonatomic, readonly) UIView *rightView; @property (weak, nonatomic, readonly) UIView *mainView; @end // ------------------------------------------------------- #import "DrawerViewController.h" #define ScreenWidth [UIScreen mainScreen].bounds.size.width #define ScreenHeight [UIScreen mainScreen].bounds.size.height #define MaxOffsetY 100 #define MaxOffsetX ([UIScreen mainScreen].bounds.size.width - 100) @implementation DrawerViewController - (void)viewDidLoad { [super viewDidLoad]; // 1. 初始化视图 [self setup]; // 2. 给mainView添加拖动手势 UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGesture:)]; [self.mainView addGestureRecognizer:panGestureRecognizer]; // 3. 给self.view添加一个单击手势 UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGesture:)]; [self.view addGestureRecognizer:tap]; } - (void)tapGesture:(UITapGestureRecognizer *)tap { // mainView复位 [UIView animateWithDuration:0.2 animations:^{ self.mainView.frame = self.view.bounds; }]; } - (void)panGesture:(UIPanGestureRecognizer *)pan { CGPoint offsetPoint = [pan translationInView:self.view]; self.mainView.frame = [self frameWithOffset:offsetPoint.x]; if (self.mainView.frame.origin.x > 0) { // → 右移(显示leftView) self.rightView.hidden = YES; } else if (self.mainView.frame.origin.x < 0) { // ← 左移(显示rightView) self.rightView.hidden = NO; } // 如果拖拽结束,自动定位 CGFloat targetOffsetX = 0; if (pan.state == UIGestureRecognizerStateEnded) { if (self.mainView.frame.origin.x >= ScreenWidth * 0.5) { // 右侧 targetOffsetX = MaxOffsetX; } else if (CGRectGetMaxX(self.mainView.frame) < ScreenWidth * 0.5){ // 左侧 targetOffsetX = -MaxOffsetX; } // 计算出当前位置距离目标位置所需要的偏移距离 CGFloat offsetX = targetOffsetX - self.mainView.frame.origin.x; // 滑动不到屏幕一般时仍然显示mainView(self.view.bounds) 否则自动定位到左侧或右侧 CGRect mainFrame = targetOffsetX == 0 ? self.view.bounds : [self frameWithOffset:offsetX]; [UIView animateWithDuration:0.2 animations:^{ self.mainView.frame = mainFrame; }]; } [pan setTranslation:CGPointZero inView:self.view]; } - (CGRect)frameWithOffset:(CGFloat)offsetX { CGRect newFrame = self.mainView.frame; newFrame.origin.x += offsetX; // x CGFloat offsetY = self.mainView.frame.origin.x * MaxOffsetY / ScreenWidth; newFrame.origin.y = fabs(offsetY); // y CGFloat offsetHeight = ScreenHeight - (newFrame.origin.y * 2); newFrame.size.height = offsetHeight; // height return newFrame; } - (void)setup { UIView *leftView = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds]; //leftView.backgroundColor = [UIColor lightGrayColor]; _leftView = leftView; [self.view addSubview:leftView]; UIView *rightView = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds]; //rightView.backgroundColor = [UIColor magentaColor]; _rightView = rightView; [self.view addSubview:rightView]; UIView *mainView = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds]; //mainView.backgroundColor = [UIColor blackColor]; _mainView = mainView; [self.view addSubview:mainView]; } @end
使用封装
1.将DrawerViewController类拖入到工程中,并继承该类
2.分别创建LeftViewController、RightViewController、MainViewController
3.将每个视图对应的view添加到对应的视图上,并成为当前控制器的子控制器
第一步:继承DrawerViewController
#import <UIKit/UIKit.h> #import "DrawerViewController.h" @interface ViewController : DrawerViewController @end
第二步:分别创建LeftViewController、RightViewController、MainViewController
第三步:为leftView、rightView、mainView 添加子视图,并将每天控制器作为当前控制器的子控制器
#import "ViewController.h" #import "LeftViewController.h" #import "RightViewController.h" #import "MainViewController.h" @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; // Main MainViewController *mainViewController = [[MainViewController alloc] init]; mainViewController.view.frame = self.view.bounds; mainViewController.view.backgroundColor = [UIColor brownColor]; [self.mainView addSubview:mainViewController.view]; [self addChildViewController:mainViewController]; // Left LeftViewController *leftViewController = [[LeftViewController alloc] init]; leftViewController.view.frame = self.view.bounds; leftViewController.view.backgroundColor = [UIColor purpleColor]; [self.leftView addSubview:leftViewController.view]; [self addChildViewController:leftViewController]; // Right RightViewController *rightViewController = [[RightViewController alloc] init]; rightViewController.view.frame = self.view.bounds; rightViewController.view.backgroundColor = [UIColor cyanColor]; [self.rightView addSubview:rightViewController.view]; [self addChildViewController:rightViewController]; } @end
实现效果:
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