抽屉效果

#import "ViewController.h"

#import "redView.h"

@interface ViewController ()// 控制器.m文件

@property(nonatomic, weak) UIView *blueV;

@property(nonatomic, weak) redView *redV;

@property(nonatomic, weak) UIView *greenV;

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

//  初始化

    [self setUP];

    

}

// 初始化

- (void)setUP

{

    //    添加3个不同的View

    UIView *blueView = [[UIView alloc] init];

    UIView *greenView = [[UIView alloc] init];

    redView *redV = [[redView alloc] init];

    

    self.blueV = blueView;

    self.redV = redV;

    self.greenV = greenView;

    self.redV.greenV = greenView;

    

    //    设置3个界面的背景颜色和frame

    blueView.backgroundColor = [UIColor blueColor];

    redV.backgroundColor = [UIColor redColor];

    greenView.backgroundColor = [UIColor greenColor];

    

    blueView.frame = self.view.bounds;

    greenView.frame = self.view.bounds;

    redV.frame = self.view.bounds;

    

    //    添加视图

    [self.view addSubview:blueView];

    [self.view addSubview:greenView];

    [self.view addSubview:redV];

    

}

@end

// redView.h文件

#import <UIKit/UIKit.h>

@interface redView : UIView

@property(nonatomic ,weak) UIView *greenV;

@end

// redView.m文件

#import "redView.h"

@implementation redView

- (instancetype)initWithFrame:(CGRect)frame

{

    if (self = [super initWithFrame:frame]) {

//            创建一个拖动手势

        UIPanGestureRecognizer *panPG = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panPg:)];

//            添加手势

        [self addGestureRecognizer:panPG];

    }

    return self;

}

// 当用户手指拖动当前view时调用

- (void)panPg:(UIPanGestureRecognizer *)panPG

{

    // 拿到偏移量的点

    CGPoint transP = [panPG translationInView:self];

    

    if (self.frame.origin.x > 0)

    {

        self.greenV.hidden = YES;

    }else

    {

        self.greenV.hidden = NO;

    }

    

    self.transform = CGAffineTransformTranslate(self.transform, transP.x, 0);

    

    CGFloat X  = self.frame.origin.x;

    X += transP.x;

    CGFloat Y = fabs(X/[UIScreen mainScreen].bounds.size.width * 30);

    CGFloat W = [UIScreen mainScreen].bounds.size.width;

    CGFloat y = fabs(X/[UIScreen mainScreen].bounds.size.width * 30);

    CGFloat H = [UIScreen mainScreen].bounds.size.height - 2 * y;

    

    self.frame = CGRectMake(X, Y, W, H);

    // 复位

    [panPG setTranslation:CGPointZero inView:self];

    

//    判断各种情况定位

    [UIView animateWithDuration:0.2 animations:^{

//        当停止手势时调用

        if (panPG.state == UIGestureRecognizerStateEnded) {

            if (self.frame.origin.x > [UIScreen mainScreen].bounds.size.width * 0.5)

            {

                [self changeFrame:275];

                

            }else if(CGRectGetMaxX(self.frame) < [UIScreen mainScreen].bounds.size.width * 0.5)

            {

                [self changeFrame:-275];

            }else

            {

                self.frame = [UIScreen mainScreen].bounds;

            }

        }

    }];

}

// 定位当前控件的frame

- (void)changeFrame:(CGFloat)x

{

    CGRect frame = self.frame;

    frame.origin.x = x;

    frame.origin.y = 30;

    frame.size.height = [UIScreen mainScreen].bounds.size.height - 60;

    self.frame = frame;

}

@end