iOS抽屉效果

#define kScreenSize           [[UIScreen mainScreen] bounds].size
#define kScreenWidth          [[UIScreen mainScreen] bounds].size.width
#define kScreenHeight         [[UIScreen mainScreen] bounds].size.height

#define kMainPageDistance   100   //打开左侧窗时，中视图(右视图)露出的宽度
#define kMainPageScale   1.0 //打开左侧窗时，中视图(右视图）缩放比例
#define kMainPageCenter  CGPointMake(kScreenWidth + kScreenWidth * kMainPageScale / 2.0 - kMainPageDistance, kScreenHeight / 2)  //打开左侧窗时，中视图中心点

#define vCouldChangeDeckStateDistance  (kScreenWidth - kMainPageDistance) / 2.0 - 40 //滑动距离大于此数时，状态改变（关--》开，或者开--》关）
#define vSpeedFloat   0.7    //滑动速度

#define kLeftAlpha 0.9  //左侧蒙版的最大值
#define kLeftCenterX 30 //左侧初始偏移量
#define kLeftScale 0.7 //左侧初始缩放比例

#define vDeckCanNotPanViewTag    987654   // 不响应此侧滑的View的tag

#import <UIKit/UIKit.h>
#import "UIView_extra.h"

@interface LeftSlideViewController : UIViewController

//滑动速度系数-建议在0.5-1之间。默认为0.5
@property (nonatomic,assign) CGFloat speedf;

//左侧窗控制器
@property (nonatomic,strong) UIViewController *leftVC;

@property (nonatomic,strong) UIViewController *mainVC;
//点击手势控制器，是否允许点击视图恢复视图位置。默认为yes
@property (nonatomic,strong) UITapGestureRecognizer *sideslipTapGes;

//滑动手势控制器
@property (nonatomic,strong) UIPanGestureRecognizer *pan;

//侧滑窗是否关闭(关闭时显示为主页)
@property (nonatomic,assign) BOOL closed;

/**
@brief 初始化侧滑控制器
@param leftVC 右视图控制器
mainVC 中间视图控制器
@result instancetype 初始化生成的对象
*/
- (instancetype)initWithLeftView:(UIViewController *)leftVC
andMainView:(UIViewController *)mainVC;

/**
@brief 关闭左视图
*/
- (void)closeLeftView;

/**
@brief 打开左视图
*/
- (void)openLeftView;

/**
*  设置滑动开关是否开启
*
*  @param enabled YES:支持滑动手势，NO:不支持滑动手势
*/
- (void)setPanEnabled: (BOOL) enabled;

#import "LeftSlideViewController.h"

@interface LeftSlideViewController ()<UIGestureRecognizerDelegate>
{
CGFloat _scalef;  //实时横向位移
}

@property (nonatomic,strong) UITableView *leftTableview;
@property (nonatomic,assign) CGFloat leftTableviewW;
@property (nonatomic,strong) UIView *contentView;
@end

@implementation LeftSlideViewController

- (void)viewDidLoad {
[super viewDidLoad];
}

/**
@brief 初始化侧滑控制器
@param leftVC 左视图控制器
mainVC 中间视图控制器
@result instancetype 初始化生成的对象
*/
- (instancetype)initWithLeftView:(UIViewController *)leftVC
andMainView:(UIViewController *)mainVC{
if(self = [super init]){
self.speedf = vSpeedFloat;
self.leftVC = leftVC;
self.mainVC = mainVC;
[self addChildViewController:self.leftVC];
[self addChildViewController:self.mainVC];
//滑动手势
self.pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(handlePan:)];
[self.mainVC.view addGestureRecognizer:self.pan];

[self.pan setCancelsTouchesInView:YES];
self.pan.delegate = self;

self.leftVC.view.hidden = YES;

[self.view addSubview:self.leftVC.view];

//蒙版
UIView *view = [[UIView alloc] init];
view.frame = self.leftVC.view.bounds;
view.backgroundColor = [UIColor blackColor];
view.alpha = 0.5;
self.contentView = view;
[self.leftVC.view addSubview:view];

//获取左侧tableview
for (UIView *obj in self.leftVC.view.subviews) {
if ([obj isKindOfClass:[UITableView class]]) {
self.leftTableview = (UITableView *)obj;
}
}
self.leftTableview.backgroundColor = [UIColor clearColor];
self.leftTableview.frame = CGRectMake(0, 0, kScreenWidth - kMainPageDistance, kScreenHeight);

//设置左侧tableview的初始位置和缩放系数
self.leftTableview.transform = CGAffineTransformMakeScale(kLeftScale, kLeftScale);
self.leftTableview.center = CGPointMake(kLeftCenterX, kScreenHeight * 0.5);

[self.view addSubview:self.mainVC.view];
self.closed = YES;//初始时侧滑窗关闭

}
return self;
}

- (void) viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
self.leftVC.view.hidden = NO;
}

#pragma mark - 滑动手势
- (void) handlePan: (UIPanGestureRecognizer *)rec{

CGPoint point = [rec translationInView:self.view];
_scalef = (point.x * self.speedf + _scalef);
BOOL needMoveWithTap = YES;  //是否还需要跟随手指移动
if (((self.mainVC.view.x <= 0) && (_scalef <= 0)) || ((self.mainVC.view.x >= (kScreenWidth - kMainPageDistance )) && (_scalef >= 0))){
//边界值管控
_scalef = 0;
needMoveWithTap = NO;
}

//根据视图位置判断是左滑还是右边滑动
if (needMoveWithTap && (rec.view.frame.origin.x >= 0) && (rec.view.frame.origin.x <= (kScreenWidth - kMainPageDistance))){

CGFloat recCenterX = rec.view.center.x + point.x * self.speedf;
if (recCenterX < kScreenWidth * 0.5 - 2) {
recCenterX = kScreenWidth * 0.5;
}

CGFloat recCenterY = rec.view.center.y;

rec.view.center = CGPointMake(recCenterX,recCenterY);

//scale 1.0~kMainPageScale
CGFloat scale = 1 - (1 - kMainPageScale) * (rec.view.frame.origin.x / (kScreenWidth - kMainPageDistance));

rec.view.transform = CGAffineTransformScale(CGAffineTransformIdentity,scale, scale);
[rec setTranslation:CGPointMake(0, 0) inView:self.view];

CGFloat leftTabCenterX = kLeftCenterX + ((kScreenWidth - kMainPageDistance) * 0.5 - kLeftCenterX) * (rec.view.frame.origin.x / (kScreenWidth - kMainPageDistance));

//leftScale kLeftScale~1.0
CGFloat leftScale = kLeftScale + (1 - kLeftScale) * (rec.view.frame.origin.x / (kScreenWidth - kMainPageDistance));

self.leftTableview.center = CGPointMake(leftTabCenterX, kScreenHeight * 0.5);
self.leftTableview.transform = CGAffineTransformScale(CGAffineTransformIdentity, leftScale,leftScale);

//tempAlpha kLeftAlpha~0
CGFloat tempAlpha = kLeftAlpha - kLeftAlpha * (rec.view.frame.origin.x / (kScreenWidth - kMainPageDistance));
self.contentView.alpha = tempAlpha;

}else{
//超出范围，
if (self.mainVC.view.x < 0){
[self closeLeftView];
_scalef = 0;
}else if (self.mainVC.view.x > (kScreenWidth - kMainPageDistance)){
[self openLeftView];
_scalef = 0;
}
}

//手势结束后修正位置,超过约一半时向多出的一半偏移
if (rec.state == UIGestureRecognizerStateEnded) {
if (fabs(_scalef) > vCouldChangeDeckStateDistance){
if (self.closed){
[self openLeftView];
}else{
[self closeLeftView];
}
}else{
if (self.closed){
[self closeLeftView];
}else{
[self openLeftView];
}
}
_scalef = 0;
}
}

#pragma mark - 单击手势
-(void)handeTap:(UITapGestureRecognizer *)tap{
if ((!self.closed) && (tap.state == UIGestureRecognizerStateEnded)){
[UIView beginAnimations:nil context:nil];
tap.view.transform = CGAffineTransformScale(CGAffineTransformIdentity,1.0,1.0);
tap.view.center = CGPointMake([UIScreen mainScreen].bounds.size.width/2,[UIScreen mainScreen].bounds.size.height/2);
self.closed = YES;
self.leftTableview.center = CGPointMake(kLeftCenterX, kScreenHeight * 0.5);
self.leftTableview.transform = CGAffineTransformScale(CGAffineTransformIdentity,kLeftScale,kLeftScale);
self.contentView.alpha = kLeftAlpha;

[UIView commitAnimations];
_scalef = 0;
[self removeSingleTap];
}

}

#pragma mark - 修改视图位置
/**
@brief 关闭左视图
*/
- (void)closeLeftView{
[UIView beginAnimations:nil context:nil];
self.mainVC.view.transform = CGAffineTransformScale(CGAffineTransformIdentity,1.0,1.0);
self.mainVC.view.center = CGPointMake(kScreenWidth / 2, kScreenHeight / 2);
self.closed = YES;

self.leftTableview.center = CGPointMake(kLeftCenterX, kScreenHeight * 0.5);
self.leftTableview.transform = CGAffineTransformScale(CGAffineTransformIdentity,kLeftScale,kLeftScale);
self.contentView.alpha = kLeftAlpha;

[UIView commitAnimations];
[self removeSingleTap];
}

/**
@brief 打开左视图
*/
- (void)openLeftView;{
[UIView beginAnimations:nil context:nil];
self.mainVC.view.transform = CGAffineTransformScale(CGAffineTransformIdentity,kMainPageScale,kMainPageScale);
self.mainVC.view.center = kMainPageCenter;

self.closed = NO;

self.leftTableview.center = CGPointMake((kScreenWidth - kMainPageDistance) * 0.5, kScreenHeight * 0.5);
self.leftTableview.transform = CGAffineTransformScale(CGAffineTransformIdentity,1.0,1.0);
self.contentView.alpha = 0;
[UIView commitAnimations];
[self disableTapButton];
}

#pragma mark - 行为收敛控制
- (void)disableTapButton{
for (UIButton *tempButton in [_mainVC.view subviews]){
[tempButton setUserInteractionEnabled:NO];
}
//单击
if (!self.sideslipTapGes){
//单击手势
self.sideslipTapGes= [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handeTap:)];
[self.sideslipTapGes setNumberOfTapsRequired:1];

[self.mainVC.view addGestureRecognizer:self.sideslipTapGes];
self.sideslipTapGes.cancelsTouchesInView = YES;  //点击事件盖住其它响应事件,但盖不住Button;
}
}

//关闭行为收敛
- (void) removeSingleTap{
for (UIButton *tempButton in [self.mainVC.view  subviews]){
[tempButton setUserInteractionEnabled:YES];
}
[self.mainVC.view removeGestureRecognizer:self.sideslipTapGes];
self.sideslipTapGes = nil;
}

/**
*  设置滑动开关是否开启
*
*  @param enabled YES:支持滑动手势，NO:不支持滑动手势
*/

- (void)setPanEnabled: (BOOL) enabled{
[self.pan setEnabled:enabled];
}

-(BOOL)gestureRecognizer:(UIGestureRecognizer*)gestureRecognizer shouldReceiveTouch:(UITouch*)touch {
if(touch.view.tag == vDeckCanNotPanViewTag){
return NO;
}
else{
return YES;
}
}

@end