自定义UIActionSheet实现分享功能，一行代码搞定！

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1、先上图，有图好说话

Simulator-Screen-Shot-2016年3月13日-下午5.35.17

2、设置思路

2.1、我希望这是一个View，并非控制器，节省开支；
2.2、 这个View包含一个背景，一个面板，若干个按钮或标签；
2.3、我希望实现的功能是视图展示+事件响应；
2.4、希望无偶合性，并且一行代码搞定(能一行代码搞定的必定包含block)；
2.5、这若干个按钮最好是外面传进来，要不我怎么知道需要什么样的按钮？传一组图片？那文字呢？再传一组文字？如何对应？
2.6、我希望开始调用的时候只要传按钮给你，结束后告诉我用户点了哪个按钮，其他的我都不想管(高度无偶封装)，呵呵！
2.7、调用时还最好是类方法，我不喜欢alloc；
2.8、例如：+ (instancetype)sheetWithItems:(NSArray<__kindof UIButton *> *)items actionWithBlock:(SAActionSheetBlock)block

3、基本调用

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//
//? ViewController.m
//? Test
//
//? Created by 余西安 on 16/3/11.
//? Copyright ? 2016年 Sian. All rights reserved.
//
?
#import "ViewController.h"
#import "SAActionSheet.h"
?
@interface ViewController ()
?
@end
?
@implementation ViewController
?
- (void)viewDidLoad
{
????[super viewDidLoad];
}
/// 弹出分享面板
- (IBAction)action:(UIButton *)sender
{
????[SAActionSheet sheetWithItems:[self shareItems] actionWithBlock:^(UIButton *item, NSInteger index) {
????????switch (index) {
????????????case 1: [self show:@"微信好友"]; break;
????????????case 2: [self show:@"朋友圈"]; break;
????????????case 3: [self show:@"微信收藏"]; break;
????????????case 4: [self show:@"QQ好友"]; break;
????????????case 5: [self show:@"QQ空间"]; break;
????????????default: break;
????????}
????}];
}
/// 创建按钮数组
- (NSArray *)shareItems
{
????UIImage *image1 = [UIImage imageNamed:@"Action_Share.png"];
????UIImage *image2 = [UIImage imageNamed:@"Action_Moments.png"];
????UIImage *image3 = [UIImage imageNamed:@"Action_MyFavAdd.png"];
????UIImage *image4 = [UIImage imageNamed:@"Action_QQ.png"];
????UIImage *image5 = [UIImage imageNamed:@"Action_qzone.png"];
????UIButton *button1 = [UIButton buttonWithType:UIButtonTypeSystem];
????UIButton *button2 = [UIButton buttonWithType:UIButtonTypeSystem];
????UIButton *button3 = [UIButton buttonWithType:UIButtonTypeSystem];
????UIButton *button4 = [UIButton buttonWithType:UIButtonTypeSystem];
????UIButton *button5 = [UIButton buttonWithType:UIButtonTypeSystem];
????[button1 setBackgroundImage:image1 forState:UIControlStateNormal];
????[button2 setBackgroundImage:image2 forState:UIControlStateNormal];
????[button3 setBackgroundImage:image3 forState:UIControlStateNormal];
????[button4 setBackgroundImage:image4 forState:UIControlStateNormal];
????[button5 setBackgroundImage:image5 forState:UIControlStateNormal];
????[button1 setTitle:@"微信好友" forState:UIControlStateNormal];
????[button2 setTitle:@"朋友圈" forState:UIControlStateNormal];
????[button3 setTitle:@"微信收藏" forState:UIControlStateNormal];
????[button4 setTitle:@"QQ好友" forState:UIControlStateNormal];
????[button5 setTitle:@"QQ空间" forState:UIControlStateNormal];
????return @[button1, button2, button3, button4, button5];
}
// 附属方法，显示结果
- (void)show:(NSString *)string
{
????[[[UIAlertView alloc] initWithTitle:nil message:string delegate:nil cancelButtonTitle:@"知道了" otherButtonTitles:nil, nil] show];
}
@end

4、代码实现

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//
//? SAActionSheet.m
//? fisher
//
//? Created by 余西安 on 16/3/10.
//? Copyright ? 2016年 Sian. All rights reserved.
//
#define kSAActionSheetItemColumns??? 3????? // 每行按钮数（纵列数）
#define kSAActionSheetItemWidth????? 60???? // 单个按钮长宽
#define kSAActionSheetItemSpace????? 25???? // 按钮上下之间间隔
#define kSAActionSheetLabelHeight??? 25???? // 按钮标签文字高度
#define kSAActionSheetCancelHeight?? 50???? // 取消按钮高度
#import "SAActionSheet.h"
@interface SAActionSheet ()
?
@property (nonatomic, strong) UIView??? *baseView;????? // 按钮基础板
@property (nonatomic, strong) NSArray?? *items;???????? // 按钮数组
@property (nonatomic, strong) NSArray?? *labels;??????? // 按钮标签
@property (nonatomic, strong) UIButton? *cancel;??????? // 取消按钮
@property (nonatomic, copy) SAActionSheetBlock? block;? // 完成Block
?
@end
?
@implementation SAActionSheet
?
+ (instancetype)sheetWithItems:(NSArray<__kindof UIButton *> *)items actionWithBlock:(SAActionSheetBlock)block
{
????SAActionSheet *sheet = [[self alloc] initWithItems:items actionWithBlock:block];
????return [sheet show];
}
?
- (instancetype)initWithItems:(NSArray<__kindof UIButton *> *)items actionWithBlock:(SAActionSheetBlock)block
{
????if (self = [super init]){
????????// 1、接收变量
????????self.block = block;
????????self.items = items;
????????// 2、创建基础面板视图（动画升上来的那个白色面板，用来放分享按钮、标签等）
????????self.baseView = [[UIView alloc] init];
????????self.baseView.backgroundColor = [UIColor colorWithWhite:0.9 alpha:0.9];
????????[self addSubview:self.baseView];
????????// 3、创建分享按钮及对应标签
????????NSMutableArray *labelArray = [NSMutableArray array];
????????for (int i = 0; i < items.count; i++) {
????????????// 3.1、遍历传进来的按钮数组，将每个按钮添加到baseView上，并序号添加tag标记
????????????UIButton *button = [items objectAtIndex:i];
????????????[button setTag:i + 1];
????????????[self.baseView addSubview:button];
????????????// 3.2、创建按钮标签，取出标签后将按钮上的文字删除掉，避免重复
????????????UILabel *label = [[UILabel alloc] init];
????????????label.font = [UIFont systemFontOfSize:11];
????????????label.textAlignment = NSTextAlignmentCenter;
????????????label.text = [button titleForState:UIControlStateNormal];
????????????[labelArray addObject:label];
????????????[self.baseView addSubview:label];
????????????// 3.3、添加按钮事件统一处理方法
????????????[button? setTitle:nil forState:UIControlStateNormal];
????????????[button addTarget:self action:@selector(buttonEven:) forControlEvents:UIControlEventTouchUpInside];
????????}
????????self.labels = labelArray;
????????// 4、取消按钮并绑定相关事件
????????self.cancel = [UIButton buttonWithType:UIButtonTypeSystem];
????????[self.cancel addTarget:self action:@selector(hidden) forControlEvents:UIControlEventTouchUpInside];
????????[self.cancel setBackgroundColor:[UIColor whiteColor]];
????????[self.cancel setTitle:@"取消" forState:UIControlStateNormal];
????????[self.cancel.titleLabel setFont:[UIFont systemFontOfSize:20]];
????????[self.baseView addSubview:self.cancel];
????????// 5、点击空白区域响应取消事件
????????[self addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hidden)]];
????}
????return self;
}
/// 视图调整
- (void)layoutSubviews
{
????[super layoutSubviews];
????// SAActionSheet Frame：背景大小
????self.frame = [[UIScreen mainScreen] bounds];
????/* BaseView Frame：基础视图尺寸
?????rows: 为按钮总行数
?????h: baseView视图的高 = (上下间隔高度 + 按钮高度 + 标签高度) * 行数 + 上下间隔高度 + 取消按钮高度
?????w: baseView视图的宽 = 屏幕宽度
?????*/
????NSInteger rows = (self.items.count - 1) / kSAActionSheetItemColumns + 1;
????CGFloat h = rows * (kSAActionSheetItemWidth + kSAActionSheetItemSpace + kSAActionSheetLabelHeight) + kSAActionSheetItemSpace + kSAActionSheetCancelHeight;
????CGFloat w = self.bounds.size.width;
????self.baseView.bounds = CGRectMake(0, 0, self.bounds.size.width, h);
????/* Items Frame：按钮尺寸
?????bw:? 按钮宽度
?????bh:? 按钮高度
?????sp:? 按钮间隔 = （总宽度 - 按钮个数 * 按钮宽度）/ 间隔数
?????*/
????CGFloat bw = kSAActionSheetItemWidth;
????CGFloat bh = kSAActionSheetItemWidth;
????CGFloat sp = (w - bw * kSAActionSheetItemColumns) / (kSAActionSheetItemColumns + 1);
????for (UIButton *button in self.items) {
????????NSInteger index = button.tag;?? // 按钮序号
????????NSInteger row = (index - 1) / kSAActionSheetItemColumns + 1;??? // 行序号
????????NSInteger col = (index - 1) % kSAActionSheetItemColumns + 1;??? // 列序号
????????// 按钮x值、y值
????????CGFloat x = (col - 1) * bw + col * sp;
????????CGFloat y = (row - 1) * (bh + kSAActionSheetLabelHeight) + row * kSAActionSheetItemSpace;
????????button.frame = CGRectMake(x, y, bw, bh);
????????// 在按钮下方设置相对应的标签，宽度与按钮相同，高度为预设定值
????????UILabel *label = [self.labels objectAtIndex:index - 1];
????????label.frame = CGRectMake(x, y + bh, bw, kSAActionSheetLabelHeight);
????}
????// 取消按钮在最下方，高度为50
????self.cancel.frame = CGRectMake(0, h - 50, w, kSAActionSheetCancelHeight);
}
?
/// 显示视图（弹出动画）
- (SAActionSheet *)show
{
????// 1、调整视图大小，添加到当前Windows窗口
????[self layoutSubviews];
????[[[[UIApplication sharedApplication] delegate] window] addSubview:self];
????// 2、将基础视图调整到屏幕最下方、背景设置透明
????CGFloat height = self.bounds.size.height;
????CGFloat w = self.baseView.bounds.size.width;
????CGFloat h = self.baseView.bounds.size.height;
????self.backgroundColor = [UIColor clearColor];
????self.baseView.center = CGPointMake(w * 0.5, height + h * 0.5);
????// 3、执行自下至上的推出及背景变半透明黑的动画
????[UIView animateWithDuration:0.25 animations:^{
????????self.baseView.center = CGPointMake(w * 0.5, height - h * 0.5);
????????self.backgroundColor = [UIColor colorWithWhite:0 alpha:0.5];
????}];
????return self;
}
?
/// 隐藏视图（退出释放）
- (void)hidden
{
????// 按键视图块整体下移至超出屏幕动画，背景变透明，动画结束后将视图从窗口移除
????CGFloat height = self.bounds.size.height;
????CGFloat w = self.baseView.bounds.size.width;
????CGFloat h = self.baseView.bounds.size.height;
????[UIView animateWithDuration:0.35 animations:^{
????????self.baseView.center = CGPointMake(w * 0.5, height + h * 0.5);
????????self.backgroundColor = [UIColor clearColor];
????} completion:^(BOOL finished) {
????????[self removeFromSuperview];
????}];
}
?
/// 按钮事件转交给Block处理
- (void)buttonEven:(UIButton *)button
{
????// 将事件及触发事件的按钮序号转交出去，并取消视图
????if (self.block) self.block(button, button.tag);
????[self hidden];
}
@end

5、Demo下载
SAShare

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