iOS 100行代码简单实现抽屉效果

最近看到自己一些网上的抽屉效果,看起来很酷!很眩!
但是,下下来看代码, 密密麻麻的,唉!!算了, 还是自己写吧!!

效果图.gif

#import 

@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