iOS如何用100行代码实现简单的抽屉效果

前言
iOS中抽屉效果的简单实现现在很多应用中都使用到了，网上也有很多了例子，本文主要是通过简单的一些代码来实现的，有需要的可以一起学习学习。
下面是效果图

示例代码如下

#import <UIKit/UIKit.h>@interface MainViewController : UIViewController+ （instancetype）mainViewControllerWithLeftViewController:（UIViewController *）leftViewController withMainPageViewController:（UIViewController *）mainPageViewController;@end

#import "MainViewController.h"#define KWidth self.view.frame.size.width#define KHeight self.view.frame.size.height@interface MainViewController （）@property （nonatomic,strong）UIViewController *leftVC;@property （nonatomic,strong）UIViewController *centerVC;@property （nonatomic,assign）BOOL isSlider;@property （nonatomic,strong）UIView *corverView;@end@implementation MainViewController+ （instancetype）mainViewControllerWithLeftViewController:（UIViewController *）leftViewController withMainPageViewController:（UIViewController *）mainPageViewController{MainViewController *mainVC = [[MainViewController alloc] init];mainVC.leftVC = leftViewController;mainVC.centerVC = mainPageViewController;return mainVC;}- （void）viewDidLoad{[super viewDidLoad];self.isSlider = NO;self.view.backgroundColor = [UIColor whiteColor];[self addChildViewController:self.leftVC];[self.view addSubview:self.leftVC.view];[self addChildViewController:self.centerVC];[self.view addSubview:self.centerVC.view];// 给左视图和主视图添加手势[self addGestureForView];}// 给主视图添加遮盖- （void）addCorverView{if （self.corverView） {[self.corverView removeFromSuperview];self.corverView = nil;}self.corverView = [[UIView alloc] initWithFrame:self.centerVC.view.bounds];_corverView.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.0];[self.centerVC.view addSubview:self.corverView];}// 移除主视图遮盖- （void）removeCoverView{if （self.corverView） {[self.corverView removeFromSuperview];self.corverView = nil;}}// 给左视图和主视图添加手势- （void）addGestureForView{UISwipeGestureRecognizer *rightGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector（swipeRightAction:）];rightGesture.direction = UISwipeGestureRecognizerDirectionRight;[self.centerVC.view addGestureRecognizer:rightGesture];UISwipeGestureRecognizer *leftGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector（swipeLeftAction:）];leftGesture.direction = UISwipeGestureRecognizerDirectionLeft;[self.centerVC.view addGestureRecognizer:leftGesture];UISwipeGestureRecognizer *leftVCLeftSwipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector（leftVCLeftSwipeAction:）];leftVCLeftSwipeGesture.direction = UISwipeGestureRecognizerDirectionLeft;[self.leftVC.view addGestureRecognizer:leftVCLeftSwipeGesture];}- （void）swipeRightAction:（id）sender{[self moveView:self.centerVC.view scale:0.8 panValue:KWidth];self.isSlider = YES;[self addCorverView];}- （void）swipeLeftAction:（id）sender{[self moveView:self.centerVC.view scale:1 panValue:KWidth / 2];self.isSlider = NO;[self removeCoverView];}- （void）leftVCLeftSwipeAction:（id）sender{[self moveView:self.centerVC.view scale:1 panValue:KWidth / 2];self.isSlider = NO;[self removeCoverView];}// 平移和缩放一个视图- （void）moveView:（UIView *）view scale:（CGFloat）scale panValue:（CGFloat）value{[UIView beginAnimations:nil context:nil];view.transform = CGAffineTransformScale（CGAffineTransformIdentity,scale,scale）;view.center = CGPointMake（value, view.center.y）;[UIView commitAnimations];}@end

总结
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