分享界面

#import <UIKit/UIKit.h>
@class ButtonView;
@class ShareActivityView;

typedef void (^ButtonViewHandler)(ButtonView *buttonView);

@interface ShareActivityView : UIView
//背景顏色, 默認是透明度0.95的白色
@property (nonatomic, strong) UIColor *bgColor;

//標題
@property (nonatomic, strong) UILabel *titleLabel;

//取消按鈕
@property (nonatomic, strong) UIButton *cancelButton;

//一行有多少個, 默認是4. iPhone豎屏不會多於4, 橫屏不會多於6. ipad沒試, 不建議ipad用這個.
@property (nonatomic, assign) int numberOfButtonPerLine;

//是否可以通過下滑手勢關閉視圖, 默認爲YES
@property (nonatomic, assign) BOOL useGesturer;

//是否正在顯示
@property (nonatomic, getter = isShowing) BOOL show;

//初始化
- (id)initWithTitle:(NSString *)title referView:(UIView *)referView;

//添加buttonView, HYActivityView會根據buttonView的數量自動變高, 但是沒有對高度上限做過多處理，莫要喪心病狂的添加太多.
- (void)addButtonView:(ButtonView *)buttonView;

- (void)show;

- (void)hide;
@end


@interface ButtonView : UIView
@property (nonatomic, retain) UILabel *textLabel;
@property (nonatomic, retain) UIButton *imageButton;
@property (nonatomic, retain) ShareActivityView *activityView;

- (id)initWithText:(NSString *)text image:(UIImage *)image handler:(ButtonViewHandler)handler;
@end

#import "ShareActivityView.h"

#define BUTTON_VIEW_SIDE 70.0f
#define BUTTON_VIEW_FONT_SIZE 13.0f

@interface ButtonView ()
@property (nonatomic, copy) ButtonViewHandler handler;
@end

@implementation ButtonView

- (id)initWithText:(NSString *)text image:(UIImage *)image handler:(ButtonViewHandler)handler
{
    self = [super init];
    if (self) {
        _handler = handler;
        [self setup:text image:image];
    }
    return self;
}

- (void)setup:(NSString *)text image:(UIImage *)image
{
    _textLabel = [[UILabel alloc]init];
    _textLabel.text = text;
    _textLabel.backgroundColor = [UIColor clearColor];
    _textLabel.font = [UIFont systemFontOfSize:BUTTON_VIEW_FONT_SIZE];
    _textLabel.textAlignment = NSTextAlignmentCenter;
    [self addSubview:_textLabel];
    
    _imageButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [_imageButton setImage:image forState:UIControlStateNormal];
    [_imageButton addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
    [self addSubview:_imageButton];
    // don't know why ?
    self.translatesAutoresizingMaskIntoConstraints = NO;
    _textLabel.translatesAutoresizingMaskIntoConstraints = NO;
    _imageButton.translatesAutoresizingMaskIntoConstraints = NO;
    
    NSLayoutConstraint *constraint = nil;
    NSDictionary *views = @{@"textLabel":_textLabel, @"imageButton":_imageButton};
    NSArray *constraints = nil;
    //view height
    constraint = [NSLayoutConstraint constraintWithItem:self attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:BUTTON_VIEW_SIDE];
    [self addConstraint:constraint];
    constraint = [NSLayoutConstraint constraintWithItem:self attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:BUTTON_VIEW_SIDE];
    [self addConstraint:constraint];
    // label
    constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[textLabel]|" options:0 metrics:nil views:views];
    [self addConstraints:constraints];
    //imageView
    constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-10-[imageButton(50)]-10-|" options:0 metrics:nil views:views];
    [self addConstraints:constraints];
    constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[imageButton(50)][textLabel]|" options:NSLayoutFormatAlignAllCenterX metrics:nil views:views];
    [self addConstraints:constraints];
}

- (void)dealloc
{
    [_textLabel release];
    [_handler release];
    [super dealloc];
}

- (void)buttonClick:(UIButton *)button
{
    if (_handler) {
        _handler(self);
    }
    if (_activityView) {
        [_activityView hide];
    }
}
@end

#define ICON_VIEW_HEIGHT_SPACE 8

#pragma mark  ShareActivityView
@interface ShareActivityView ()

@property (nonatomic, retain) NSString *title;

//將要顯示在該視圖上
@property (nonatomic, retain) UIView *referView;

//內容窗口
@property (nonatomic, retain) UIView *contentView;

//透明的關閉按鈕
@property (nonatomic, retain) UIButton *closeButton;

//按鈕加載的view
@property (nonatomic, retain) UIView *iconView;

//button數組
@property (nonatomic, retain) NSMutableArray *buttonArray;

//行數
@property (nonatomic, assign) int lines;

//目前正在生效的numberOfButtonPerLine
@property (nonatomic, assign) int workingNumberOfButtonPerLine;

//按鈕間的間隔大小
@property (nonatomic, assign) CGFloat buttonSpace;

//消失的時候移除
@property (nonatomic, retain) NSLayoutConstraint *contentViewAndViewConstraint;

//iconView高度的constraint
@property (nonatomic, retain) NSLayoutConstraint *iconViewHeightConstraint;

//buttonView的constraints
@property (nonatomic, retain) NSMutableArray *buttonConstraintsArray;

@end

@implementation ShareActivityView

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter]removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];
    [_referView release];
    [_contentView release];
    [_titleLabel release];
    [_iconView release];
    [super dealloc];
    
}

- (id)initWithTitle:(NSString *)title referView:(UIView *)referView
{
    self = [super init];
    if (self) {
        self.title = title;
        
        if (referView) {
            self.referView = referView;
            
        }
        
        [self setup];
        
        [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(deviceRotate:) name:UIDeviceOrientationDidChangeNotification object:nil];
        
    }
    return self;
    
}



- (void)calculateButtonSpaceWithNumberOfButtonPerLine:(int)number
{
    self.buttonSpace = (self.referView.bounds.size.width - BUTTON_VIEW_SIDE * number) / (number + 1);
    
    if (self.buttonSpace < 0) {
        [self calculateButtonSpaceWithNumberOfButtonPerLine:4];
        
    } else {
        self.workingNumberOfButtonPerLine = number;
        
    }
    
}

- (void)setup
{
    self.buttonArray = [NSMutableArray array];
    self.buttonConstraintsArray = [NSMutableArray array];
    self.lines = 0;
    self.numberOfButtonPerLine = 4;
    self.useGesturer = YES;
    
    self.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.3f];
    
    self.contentView = [[UIView alloc]init];
    self.bgColor = [UIColor colorWithRed:1 green:1 blue:1 alpha:0.95f];
    [self addSubview:self.contentView];
    
    self.closeButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [self.closeButton addTarget:self action:@selector(closeButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
    [self addSubview:self.closeButton];
    
    self.titleLabel = [[UILabel alloc]init];
    self.titleLabel.backgroundColor = [UIColor clearColor];
    self.titleLabel.textAlignment = NSTextAlignmentCenter;
    self.titleLabel.font = [UIFont systemFontOfSize:17.f];
    self.titleLabel.text = self.title;
    [self.contentView addSubview:self.titleLabel];
    
    self.cancelButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [self.cancelButton setTitle:@"取 消" forState:UIControlStateNormal];
    [self.cancelButton setTitleColor:[UIColor orangeColor] forState:UIControlStateNormal];
    [self.cancelButton addTarget:self action:@selector(closeButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
    [self.contentView addSubview:self.cancelButton];
    
    self.iconView = [[UIView alloc]init];
    [self.contentView addSubview:self.iconView];
    
    self.translatesAutoresizingMaskIntoConstraints = NO;
    self.contentView.translatesAutoresizingMaskIntoConstraints = NO;
    self.closeButton.translatesAutoresizingMaskIntoConstraints = NO;
    self.titleLabel.translatesAutoresizingMaskIntoConstraints = NO;
    self.cancelButton.translatesAutoresizingMaskIntoConstraints = NO;
    self.iconView.translatesAutoresizingMaskIntoConstraints = NO;
    
    [self setNeedsUpdateConstraints];
    
    //添加下滑關閉手勢
    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeHandler:)];
    swipe.direction = UISwipeGestureRecognizerDirectionDown;
    [self addGestureRecognizer:swipe];
    
}

- (void)updateConstraints
{
    [super updateConstraints];
    
    NSArray *constraints = nil;
    NSLayoutConstraint *constraint = nil;
    NSDictionary *views = @{@"contentView": self.contentView, @"closeButton": self.closeButton, @"titleLabel": self.titleLabel, @"cancelButton": self.cancelButton, @"iconView": self.iconView, @"view": self, @"referView": self.referView};
    
    //view跟referView的寬高相等
    constraint = [NSLayoutConstraint constraintWithItem:self attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:self.referView attribute:NSLayoutAttributeWidth multiplier:1 constant:0];
    [self.referView addConstraint:constraint];
    
    constraint = [NSLayoutConstraint constraintWithItem:self attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:self.referView attribute:NSLayoutAttributeHeight multiplier:1 constant:0];
    [self.referView addConstraint:constraint];
    
    constraint = [NSLayoutConstraint constraintWithItem:self attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:self.referView attribute:NSLayoutAttributeLeading multiplier:1 constant:0];
    [self.referView addConstraint:constraint];
    
    constraint = [NSLayoutConstraint constraintWithItem:self attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self.referView attribute:NSLayoutAttributeTop multiplier:1 constant:0];
    [self.referView addConstraint:constraint];
    
    //closeButton跟view的左右挨着
    constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[closeButton]|" options:0 metrics:nil views:views];
    [self addConstraints:constraints];
    
    //contentView跟view的左右挨着
    constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[contentView]|" options:0 metrics:nil views:views];
    [self addConstraints:constraints];
    
    //垂直方向closeButton挨着contentView
    constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[closeButton(==view@999)][contentView]" options:0 metrics:nil views:views];
    [self addConstraints:constraints];
    
    //titleLabel跟contentView左右挨着
    constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[titleLabel]|" options:0 metrics:nil views:views];
    [self.contentView addConstraints:constraints];
    
    //cancelButton跟contentView左右挨着
    constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[cancelButton]|" options:0 metrics:nil views:views];
    [self.contentView addConstraints:constraints];
    
    //iconView跟contentView左右挨着
    constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[iconView]|" options:0 metrics:nil views:views];
    [self.contentView addConstraints:constraints];
    
    //iconView的高度
    if (self.iconViewHeightConstraint) {
        [self.iconView removeConstraint:self.iconViewHeightConstraint];
        
    }
    self.iconViewHeightConstraint = [NSLayoutConstraint constraintWithItem:self.iconView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:self.lines * BUTTON_VIEW_SIDE + (self.lines + 1) * ICON_VIEW_HEIGHT_SPACE];
    [self.iconView addConstraint:self.iconViewHeightConstraint];
    
    //垂直方向titleLabel挨着iconView挨着cancelButton
    constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-8-[titleLabel(==30)]-[iconView]-[cancelButton(==30)]-8-|" options:0 metrics:nil views:views];
    [self.contentView addConstraints:constraints];
    
    
    
}

- (void)prepareForShow
{
    //計算行數
    int count = [self.buttonArray count];
    self.lines = count / self.workingNumberOfButtonPerLine;
    if (count % self.workingNumberOfButtonPerLine != 0) {
        self.lines++;
        
    }
    
    for (int i = 0; i < [self.buttonArray count]; i++) {
        ButtonView *buttonView = [self.buttonArray objectAtIndex:i];
        [self.iconView addSubview:buttonView];
        
        int y = i / self.workingNumberOfButtonPerLine;
        int x = i % self.workingNumberOfButtonPerLine;
        
        //排列buttonView的位置
        NSLayoutConstraint *constraint = [NSLayoutConstraint constraintWithItem:buttonView attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self.iconView attribute:NSLayoutAttributeTop multiplier:1 constant:(y + 1) * ICON_VIEW_HEIGHT_SPACE + y * BUTTON_VIEW_SIDE];
        [self.iconView addConstraint:constraint];
        [self.buttonConstraintsArray addObject:constraint];
        
        constraint = [NSLayoutConstraint constraintWithItem:buttonView attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:self.iconView attribute:NSLayoutAttributeLeading multiplier:1 constant:(x + 1) * self.buttonSpace + x * BUTTON_VIEW_SIDE];
        [self.iconView addConstraint:constraint];
        [self.buttonConstraintsArray addObject:constraint];
        
    }
    
    [self layoutIfNeeded];
    
    
}

- (void)show
{
    
    if (self.isShowing) {
        return;
        
    }
    [self.referView addSubview:self];
    [self setNeedsUpdateConstraints];
    self.alpha = 0;
    
    [self prepareForShow];
    
    self.contentViewAndViewConstraint = [NSLayoutConstraint constraintWithItem:self.contentView attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeBottom multiplier:1 constant:0];
    [self addConstraint:self.contentViewAndViewConstraint];
    
    [UIView animateWithDuration:0.25f animations:^{
        self.alpha = 1;
        [self layoutIfNeeded];
        self.show = YES;
        
    }];
    
}

- (void)hide
{
    if (!self.isShowing) {
        return;
        
    }
    
    [UIView animateWithDuration:0.25f animations:^{
        self.alpha = 0;
        [self removeConstraint:self.contentViewAndViewConstraint];
        self.contentViewAndViewConstraint = nil;
        [self layoutIfNeeded];
        
    } completion:^(BOOL finished) {
        self.show = NO;
        [self removeFromSuperview];
        
    }];
    
}

- (void)deviceRotate:(NSNotification *)notification
{
    [self.iconView removeConstraints:self.buttonConstraintsArray];
    [self.buttonConstraintsArray removeAllObjects];
    
    [self calculateButtonSpaceWithNumberOfButtonPerLine:self.numberOfButtonPerLine];
    [self prepareForShow];
    
    [self.iconView removeConstraint:self.iconViewHeightConstraint];
    self.iconViewHeightConstraint = [NSLayoutConstraint constraintWithItem:self.iconView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:self.lines * BUTTON_VIEW_SIDE + (self.lines + 1) * ICON_VIEW_HEIGHT_SPACE];
    [self.iconView addConstraint:self.iconViewHeightConstraint];
    
}

- (void)setNumberOfButtonPerLine:(int)numberOfButtonPerLine
{
    _numberOfButtonPerLine = numberOfButtonPerLine;
    [self calculateButtonSpaceWithNumberOfButtonPerLine:numberOfButtonPerLine];
    
}

- (void)setBgColor:(UIColor *)bgColor
{
    _bgColor = bgColor;
    self.contentView.backgroundColor = bgColor;
    
}

- (void)addButtonView:(ButtonView *)buttonView
{
    [self.buttonArray addObject:buttonView];
    buttonView.activityView = self;
    
}

- (void)closeButtonClicked:(UIButton *)button
{
    [self hide];
    
}

- (void)swipeHandler:(UISwipeGestureRecognizer *)swipe
{
    if (self.useGesturer) {
        [self hide];
        
    }
    
}
@end

- (void)addButtonClicked:(UIButton *)button
{
    ButtonView *bv = [[ButtonView alloc]initWithText:@"新浪微博" image:[UIImage imageNamed:@"share_platform_sina"] handler:^(ButtonView *buttonView){
        NSLog(@"點擊新增的新浪微博");
    }];
    [self.activityView addButtonView:bv];
}
//鏈接
- (void)linkButton:(UIButton *)button
{
    if (!self.activityView) {
        self.activityView = [[ShareActivityView alloc]initWithTitle:@"分享到哪裏" referView:self.view];
        
        //橫屏會變成一行6個, 豎屏無法一行同時顯示6個, 會自動使用默認一行4個的設置.
        self.activityView.numberOfButtonPerLine = 6;
        
        ButtonView *bv = [[ButtonView alloc]initWithText:@"新浪微博" image:[UIImage imageNamed:@"share_platform_sina"] handler:^(ButtonView *buttonView){
            NSLog(@"點擊新浪微博");
        }];
        [self.activityView addButtonView:bv];
        
        bv = [[ButtonView alloc]initWithText:@"Email" image:[UIImage imageNamed:@"share_platform_email"] handler:^(ButtonView *buttonView){
            NSLog(@"點擊Email");
        }];
        [self.activityView addButtonView:bv];
        
        bv = [[ButtonView alloc]initWithText:@"印象筆記" image:[UIImage imageNamed:@"share_platform_evernote"] handler:^(ButtonView *buttonView){
            NSLog(@"點擊印象筆記");
        }];
        [self.activityView addButtonView:bv];
        
        bv = [[ButtonView alloc]initWithText:@"QQ" image:[UIImage imageNamed:@"share_platform_qqfriends"] handler:^(ButtonView *buttonView){
            NSLog(@"點擊QQ");
        }];
        [self.activityView addButtonView:bv];
        
        bv = [[ButtonView alloc]initWithText:@"微信" image:[UIImage imageNamed:@"share_platform_wechat"] handler:^(ButtonView *buttonView){
            NSLog(@"點擊微信");
        }];
        [self.activityView addButtonView:bv];
        
        bv = [[ButtonView alloc]initWithText:@"微信圈" image:[UIImage imageNamed:@"share_platform_wechattimeline"] handler:^(ButtonView *buttonView){
//            NSLog(@"添加");
//            [self addButtonClicked:buttonView.imageButton];
        }];
        [self.activityView addButtonView:bv];
    }
    [self.activityView show];
}