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：

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。