底滑抽屉（分享）

1. 代码片段， 实现一个底部上滑抽屉，携带暗黑遮罩效果，

2. 主要在于函数

- (UIViewController *)appRootViewController  

获取到rooView。

3. 定义几个常用的宏，注意类实现使用到的技巧，枚举的使用，协议代理其实也可以使用Block来进行毁掉，根据实际的经验，这种功能其实如果使用协议代理，会感觉更加优雅，

#define RGBCOLOR(r,g,b)                                     [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:1]

#define RGBACOLOR(r,g,b,a)                                  [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:(a)]

#define RGBCOLOR_HEX(h)                                     RGBCOLOR((((h)>>16)&0xFF), (((h)>>8)&0xFF), ((h)&0xFF))

#define RGBACOLOR_HEX(h,a)                                  RGBACOLOR((((h)>>16)&0xFF), (((h)>>8)&0xFF), ((h)&0xFF), (a))

//屏幕高度

#define SCREENH [UIScreen mainScreen].bounds.size.height

/// 设计图纸尺寸比例

#define kRATIO  (SCREENH/667.0)

=============。h文件

#import <UIKit/UIKit.h>

typedef NS_ENUM(NSUInteger, CNBottomViewStyle) {

    CNBottomViewStyleNewsDetail,

    CNBottomViewStyleShare,

    CNBottomViewStyleOther,

};

typedef NS_ENUM(NSUInteger, CNBottomEvent) {

    CNBottomEventShare,

    CNBottomEventHeart,

    CNBottomEventComment,

    CNBottomEventFieldTouch,

    

    CNBottomEventShareWhatsapp  = 100,

    CNBottomEventShareFacebook  = 200,

    CNBottomEventShareTwitter   = 300,

    CNBottomEventShareMore      = 400,

    CNBottomEventShareCancel    = 500,

    CNBottomEventNone,

};

@protocol CNBottomViewDelegate <NSObject>

@optional

- (BOOL)bottomFieldShouldBeginEditing;

- (void)bottomBtnClickEvent:(CNBottomEvent)event;

@end

@interface CNBottomView : UIView

@property (nonatomic,strong) UIImageView   *imgvBackground;

@property (nonatomic,strong) NSString      *commentCount;

@property (nonatomic,assign, readonly)CNBottomViewStyle style;

@property (nonatomic,assign)id<CNBottomViewDelegate>delegate;

@property (nonatomic,strong) UINavigationController *nav;

- (instancetype)initWithFrame:(CGRect)frame style:(CNBottomViewStyle)style;

- (instancetype)initWithStyle:(CNBottomViewStyle)style;

- (void)setHidden:(BOOL)hidden;

CGFloat heighOfInputBar();

CGFloat heighOfShareBar();

@end

===================。m文件

#import "CNBottomView.h"

@interface CNBottomView ()<UITextFieldDelegate>

@property (nonatomic,strong) UITextField   *field;

@property (nonatomic,strong) UIButton      *btnCommi;

@property (nonatomic,strong) UILabel       *labelCom;

@property (nonatomic,strong) UIButton      *btnHeart;

@property (nonatomic,strong) UIButton      *btnShare;

@property (nonatomic,strong) UIView *viewSharePlat;

@property (nonatomic,strong) UIView *viewWhatsapp;

@property (nonatomic,strong) UIView *viewFacebook;

@property (nonatomic,strong) UIView *viewTwitter;

@property (nonatomic,strong) UIView *viewMore;

@end

@implementation CNBottomView

CGFloat heighOfInputBar() {

    return45 * kRATIO;

}

CGFloat heighOfShareBar() {

    returnheighOfShareItemBar() + heighOfShareCancel();

}

CGFloat heighOfShareItemBar() {

    return95 * kRATIO;

}

CGFloat heighOfShareCancel(){

    return46 * kRATIO;

}

- (instancetype)initWithFrame:(CGRect)frame style:(CNBottomViewStyle)style {

    self = [superinitWithFrame:frame];

    _style = style;

    if (self) {

        

        if (style ==CNBottomViewStyleNewsDetail) {

            //1. 背景图片

            self.imgvBackground = [[UIImageViewalloc] initWithFrame:self.bounds];

            self.imgvBackground.backgroundColor =RGBACOLOR_HEX(0xF0F0F0,1);

            self.layer.shadowColor =RGBACOLOR_HEX(0xd3d3d3,1).CGColor;

            self.layer.shadowOffset =CGSizeMake(0,0);

            self.layer.shadowRadius =1.5;

            //        self.layer.shadowOpacity= 0.8;

            self.layer.shadowPath = [UIBezierPathbezierPathWithRect:CGRectMake(0,-1.5,SCREENW , 1.5)].CGPath;

            

            

            [selfaddSubview:self.imgvBackground];

            

            //2. 添加输入框

            CGFloat field_w =self.width -2*(k_SpanLeft+k_SpanIn) -50;//450

            CGFloat field_h =self.height -2*k_SpanIn;//56

            _field = [[UITextFieldalloc] initWithFrame:CGRectMake(k_SpanLeft,0, field_w, field_h)];

            _field.delegate =self;

            _field.borderStyle =UITextBorderStyleRoundedRect;

            _field.placeholder =@"我也说一句…";

            _field.centerY =self.height *0.5;

            [selfaddSubview:_field];

            

            

            // 3. 分享按钮,评论按钮，收藏按钮

            CGFloat share_w =30 * kRATIO;

            CGFloat share_h =34 * kRATIO;

            CGFloat heart_w =35 * kRATIO;

            CGFloat heart_h =31 * kRATIO;

            CGFloat commi_w =34 * kRATIO;

            CGFloat commi_h =35 * kRATIO;

            

            _btnShare = [UIButtonxk_buttonWithFrame:CGRectMake(0,0, share_w, share_h) image:@"ic_share"target:selfaction:@selector(btnClick:)];

            

            _btnHeart = [UIButtonxk_buttonWithFrame:CGRectMake(0,0, heart_w, heart_h) image:@"ic_like"target:selfaction:@selector(btnClick:)];

            

            _btnCommi = [UIButtonxk_buttonWithFrame:CGRectMake(0,0, commi_w, commi_h) image:@"ic_coment"target:selfaction:@selector(btnClick:)];

            

            _labelCom = [UILabellabelFrame:CGRectMake(0,0, commi_w, commi_h) fontSize:13 *kRATIO textColor:RGBCOLOR_HEX(0xa6a6a5)];

            

            _btnShare.right =self.width -k_SpanLeft/2;

            _btnHeart.right =_btnShare.left -k_SpanIn;

            _btnShare.centerY =_btnHeart.centerY =_btnCommi.centerY =self.height *0.5;

            

            [selfaddSubview:_btnCommi];

            [selfaddSubview:_labelCom];

            [selfaddSubview:_btnHeart];

            [selfaddSubview:_btnShare];

        }

        

        

        

    }

    returnself;

}

#pragma mark - CNBottomViewStyleNewsDetail

- (void)btnClick:(UIButton *)btn {

    CNBottomEvent event =CNBottomEventNone;

    if (btn ==_btnHeart) {

        event = CNBottomEventHeart;

    }elseif (btn == _btnCommi) {

        event = CNBottomEventComment;

    }elseif (btn == _btnShare) {

        event = CNBottomEventShare;

    }

    else{

        event = btn.tag;// facebook twitter whatsapp more

    }

    

    if ([self.delegaterespondsToSelector:@selector(bottomBtnClickEvent:)]) {

        [self.delegatebottomBtnClickEvent:event];

    }

}

- (void)setCommentCount:(NSString *)commentCount {

    _commentCount = commentCount;

    _labelCom.text = commentCount;

    [selfreloadFrame];

}

- (void)reloadFrame {

    [_labelComsizeToFit];

    _labelCom.right     =_btnHeart.left -k_SpanIn;

    _btnCommi.right     =_labelCom.left -k_SpanIn/2;

    _labelCom.centerY   =self.height *0.5;

    _field.width        =_btnCommi.left -2 * k_SpanLeft;

}

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {

    if ([self.delegaterespondsToSelector:@selector(bottomFieldShouldBeginEditing)]) {

        return [self.delegatebottomFieldShouldBeginEditing];

    }

    returnNO;

}

#pragma mark - CNBottomViewStyleShare

- (instancetype)initWithStyle:(CNBottomViewStyle)style {

    self = [selfinitWithFrame:CGRectMake(0,0, SCREENW,SCREENH)];

    _style = style;

    if (self) {

        self.imgvBackground = [selfbackImageViewWithGesture];

        [selfaddSubview:self.imgvBackground];

        [selfaddSubview:self.viewSharePlat];

        

    }

    returnself;

}

- (UIImageView *)backImageViewWithGesture {

    UIImageView *imageView = [[UIImageViewalloc] initWithFrame:self.bounds];

    imageView.backgroundColor = [UIColorblackColor];

    

    imageView.alpha =0.4;

    

    imageView.userInteractionEnabled =YES;

    [imageView addGestureRecognizer:[[UITapGestureRecognizeralloc] initWithTarget:selfaction:@selector(tapEvent)]];

    

    UISwipeGestureRecognizer *swipeGR = [[UISwipeGestureRecognizeralloc] initWithTarget:selfaction:@selector(swipeEvent:)];

    swipeGR.direction =UISwipeGestureRecognizerDirectionDown|UISwipeGestureRecognizerDirectionUp;

    [imageView addGestureRecognizer:swipeGR];

    return imageView;

}

- (void)swipeEvent:(UISwipeGestureRecognizer *)swipeGR{

    NSLog(@"%lu",swipeGR.direction);

    [selfsetHidden:YES];

}

- (void)tapEvent {

    [selfsetHidden:YES];

}

- (UIView *)viewSharePlat {

    if (!_viewSharePlat) {

        _viewSharePlat = [[UIViewalloc] initWithFrame:CGRectMake(0,SCREENH, SCREENW,heighOfShareBar())];

        _viewSharePlat.backgroundColor =RGBACOLOR_HEX(0xF0F0F0,1);

        

        NSMutableArray *shareViewArr = [NSMutableArrayarrayWithObjects:self.viewWhatsapp,self.viewFacebook,self.viewTwitter,self.viewMore,nil];

        CGFloat span_w = (SCREENW -80.0*(shareViewArr.count>4?4:shareViewArr.count) )/((shareViewArr.count >4 ? 4:shareViewArr.count)+1);

        for (int i=0; i<shareViewArr.count; i++) {

            UIView *viewShare = shareViewArr[i];

            viewShare.top  =k_SpanIn + (viewShare.height +1.5*k_SpanIn)*(i/4);

            viewShare.centerX = span_w + viewShare.width*0.5 + (viewShare.width + span_w)*(i%4);

            [_viewSharePlataddSubview:viewShare];

        }

        

        UIButton *btnCancel = [UIButtonbuttonWithType:UIButtonTypeRoundedRect];

        [btnCancel setFrame:CGRectMake(0,heighOfShareItemBar(),SCREENW,heighOfShareCancel())];

        [btnCancel setTitle:@"Cancel"forState:UIControlStateNormal];

        btnCancel.tag =CNBottomEventShareCancel;

        [btnCancel addTarget:selfaction:@selector(btnClick:)forControlEvents:UIControlEventTouchUpInside];

        [btnCancel setTitleColor:RGBCOLOR_HEX(0x575757)forState:UIControlStateNormal];

        btnCancel.backgroundColor = [UIColorwhiteColor];

        [btnCancel.titleLabelsetFont:[UIFontsystemFontOfSize:18 *kRATIO]];

        [_viewSharePlataddSubview:btnCancel];

    }

    return_viewSharePlat;

}

- (UIView *)viewWhatsapp {

    if (!_viewWhatsapp) {

        _viewWhatsapp = [selfcreateShareItemWithImage:@"wahtsapp"title:@"Whatapp"tag:CNBottomEventShareWhatsapp];

    }

    return_viewWhatsapp;

}

- (UIView *)viewFacebook {

    if (!_viewFacebook) {

        _viewFacebook = [selfcreateShareItemWithImage:@"Facebook"title:@"Facebook"tag:CNBottomEventShareFacebook];

    }

    return_viewFacebook;

}

- (UIView *)viewTwitter {

    if (!_viewTwitter) {

        _viewTwitter = [selfcreateShareItemWithImage:@"twitter"title:@"Twitter"tag:CNBottomEventShareTwitter];

    }

    return_viewTwitter;

}

- (UIView *)viewMore {

    if (!_viewMore) {

        _viewMore = [selfcreateShareItemWithImage:@"sharemore"title:@"More"tag:CNBottomEventShareMore];

    }

    return_viewMore;

}

- (UIView *)createShareItemWithImage:(NSString *)imgName title:(NSString *)title tag:(NSInteger)tag{

    

    UIView *platView = [[UIViewalloc] initWithFrame:CGRectMake(0,0, 80,80)];

    

    CGFloat btn_w =50 * kRATIO;

    CGFloat span_in =5;

    CGFloat label_h =20;

    

    UIButton *btn = [UIButtonbuttonWithType:UIButtonTypeCustom];

    [btn setFrame:CGRectMake(0,0, btn_w, btn_w)];

    btn.centerX = platView.width *0.5;

    //    btn.backgroundColor = RGBCOLOR_HEX(0x514e5e);

    btn.layer.cornerRadius =7.0;

    btn.tag = tag;

    [btn setImage:[UIImageimageNamed:imgName] forState:UIControlStateNormal];

    [btn addTarget:selfaction:@selector(btnClick:)forControlEvents:UIControlEventTouchUpInside];

    [platView addSubview:btn];

    

    UILabel *label = [[UILabelalloc] initWithFrame:CGRectMake(0,btn.origin.y+btn.size.height+span_in,platView.width,label_h)];

    label.text = title;

    label.textColor =RGBCOLOR_HEX(0x6b6b6b);

    label.textAlignment =NSTextAlignmentCenter;

    label.font = [UIFontsystemFontOfSize:13 *kRATIO];

    [platView addSubview:label];

    

    return platView;

}

-(void)setHidden:(BOOL)hidden{

    weakSelf();

    self.alpha =1;

    if (hidden) {

        [UIViewanimateWithDuration:0.2delay:0.0options:0animations:^{

            self.imgvBackground.alpha =0;

            if (_viewSharePlat) {

                _viewSharePlat.center =CGPointMake(_viewSharePlat.centerX, weakSelf.height+_viewSharePlat.height);

            }

            

        } completion:^(BOOL finished) {

            NSLog(@"hidden");

            [weakSelf removeFromSuperview];

        }];

        

    }else{

        UIViewController *topVC = [selfappRootViewController];

        [topVC.viewaddSubview:self];

        //        [self.nav.view addSubview:self];

        

        [UIViewanimateWithDuration:0.2delay:0.0options:0animations:^{

            self.imgvBackground.alpha =0.4;

            if (_viewSharePlat) {

                _viewSharePlat.center =CGPointMake(_viewSharePlat.centerX, weakSelf.height-_viewSharePlat.height*0.5);

            }

        } completion:^(BOOL finished) {

            NSLog(@"nohidden");

        }];

    }

}

- (UIViewController *)appRootViewController

{

    //    UIWindow *window = [[[UIApplication sharedApplication] windows] lastObject];

    //    return window.rootViewController;

    

#if 1

    UIViewController *appRootVC = [UIApplicationsharedApplication].keyWindow.rootViewController;

    UIViewController *topVC = appRootVC;

    while (topVC.presentedViewController) {

        topVC = topVC.presentedViewController;

    }

    return topVC;

#endif

    

}