仿微信-ActionSheet

#import <Foundation/Foundation.h>

@interface ActionSheetItem : NSObject
//点击title
@property (nonatomic,copy) NSString *title;
//点击的index
@property (nonatomic,assign) NSInteger index;

+ (ActionSheetItem *)itemWithTitle:(NSString *)title index:(NSInteger)index;

@end


#import "ActionSheetItem.h"

@implementation ActionSheetItem

+ (ActionSheetItem *)itemWithTitle:(NSString *)title index:(NSInteger)index {
    
    ActionSheetItem *sheetItem = [[ActionSheetItem alloc] initWithTitle:title index:index];
    return sheetItem;
}

- (instancetype)initWithTitle:(NSString *)title index:(NSInteger)index {
    self = [super init];
    if(self) {
        _title = title;
        _index = index;
    }
    return self;
}


@end

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

typedef void(^ClickBlock)(ActionSheetItem *sheetItem);

@interface ActionSheetView : UIView

@property (nonatomic,copy)ClickBlock clickBlock;


- (instancetype)initWithCancleTitle:(NSString *)cancleTitle
                     otherTitles:(NSString *)otherTitles,... NS_REQUIRES_NIL_TERMINATION;

- (void)show;


@end

//
//  ActionSheetView.m
//  ActionSheet
//
//  Created by Doman on 17/4/17.
//  Copyright © 2017年 doman. All rights reserved.
//

#import "ActionSheetView.h"

static CGFloat BtnHeight = 40.0;//每个按钮的高度
static CGFloat CancleMargin = 6.0;//取消按钮上面的间隔
#define ActionSheetColor(r, g, b) [UIColor colorWithRed:(r/255.0) green:(g/255.0) blue:(b/255.0) alpha:1.0]
#define ActionSheetBGColor ActionSheetColor(237,240,242) //背景色
#define ActionSheetSeparatorColor ActionSheetColor(226, 226, 226) //分割线颜色
#define ActionSheetNormalImage [self imageWithColor:ActionSheetColor(255,255,255)] //普通下的图片
#define ActionSheetHighImage [self imageWithColor:ActionSheetColor(242,242,242)] //高粱的图片
#define ActionSheetBlueNormalImage [self imageWithColor:ActionSheetColor(100,175,247)] //普通下的图片

#define ScreenWidth [UIScreen mainScreen].bounds.size.width
#define ScreenHeight [UIScreen mainScreen].bounds.size.height

@interface ActionSheetView ()

@property (nonatomic, strong) UIView *sheetView;
@property (nonatomic, copy) NSMutableArray *items;

@end

@implementation ActionSheetView

- (instancetype)initWithCancleTitle:(NSString *)cancleTitle otherTitles:(NSString *)otherTitles, ...
{
    self = [super init];
    if (self) {
        //黑色遮盖
        self.frame = [UIScreen mainScreen].bounds;
        self.backgroundColor = [UIColor blackColor];
        [[UIApplication sharedApplication].keyWindow addSubview:self];
        self.alpha = 0.0;
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(coverClick)];
        [self addGestureRecognizer:tap];
        
        // sheet
        _sheetView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, ScreenWidth, 0)];
        _sheetView.backgroundColor = ActionSheetColor(236,239,240);
        _sheetView.alpha = 0.9;
        [[UIApplication sharedApplication].keyWindow addSubview:_sheetView];
        _sheetView.hidden = YES;
        
        
        int tag = 0;
        _items = [NSMutableArray array];
        //首先添加取消按钮
        ActionSheetItem *cancleItem = [ActionSheetItem itemWithTitle:@"取消" index:0];
        [_items addObject:cancleItem];
        
        tag ++;
        
        NSString* curStr;
        va_list list;
        if(otherTitles)
        {
            ActionSheetItem *item = [ActionSheetItem itemWithTitle:otherTitles index:tag];
            [_items addObject:item];
            tag ++;
            
            va_start(list, otherTitles);
            while ((curStr = va_arg(list, NSString*))) {
                ActionSheetItem *item = [ActionSheetItem itemWithTitle:curStr index:tag];
                [_items addObject:item];
                tag ++;
            }
            va_end(list);
        }
        CGRect sheetViewF = _sheetView.frame;
        sheetViewF.size.height = BtnHeight * _items.count + CancleMargin;
        _sheetView.frame = sheetViewF;
        //开始添加按钮
        [self setupBtnWithTitles];
    }
    return self;

}


// 创建每个选项
- (void)setupBtnWithTitles {
    
    for (ActionSheetItem *item in _items) {
        UIButton *btn = nil;
        if (item.index == 0) {//取消按钮
            btn = [[UIButton alloc] initWithFrame:CGRectMake(0, _sheetView.frame.size.height - BtnHeight, ScreenWidth, BtnHeight)];
            
        } else {
            btn = [[UIButton alloc] initWithFrame:CGRectMake(0, BtnHeight * (item.index - 1) , ScreenWidth, BtnHeight)];
            // 最上面画分割线
            UIView *line = [[UIView alloc] initWithFrame:CGRectMake(0, 0, ScreenWidth, 0.5)];
            line.backgroundColor = ActionSheetSeparatorColor;

            [btn addSubview:line];
            
        }
        btn.tag = item.index;
        
        [btn setBackgroundImage:ActionSheetNormalImage forState:UIControlStateNormal];
        [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        [btn setBackgroundImage:ActionSheetHighImage forState:UIControlStateHighlighted];
        [btn setTitle:item.title forState:UIControlStateNormal];
        btn.titleLabel.font = [UIFont fontWithName:@"STHeitiSC-Light" size:17];
        [btn addTarget:self action:@selector(sheetBtnClick:) forControlEvents:UIControlEventTouchUpInside];
        
        [self.sheetView addSubview:btn];
    }
}
- (void)show {
    self.sheetView.hidden = NO;
    
    CGRect sheetViewF = self.sheetView.frame;
    sheetViewF.origin.y = ScreenHeight;
    self.sheetView.frame = sheetViewF;
    
    CGRect newSheetViewF = self.sheetView.frame;
    newSheetViewF.origin.y =ScreenHeight - self.sheetView.frame.size.height;
    
    [UIView animateWithDuration:0.3 animations:^{
        
        self.sheetView.frame = newSheetViewF;
        
        self.alpha = 0.3;
    }];
}


// 显示黑色遮罩
- (void)coverClick{
    CGRect sheetViewF = self.sheetView.frame;
    sheetViewF.origin.y = ScreenHeight;
    
    [UIView animateWithDuration:0.2 animations:^{
        self.sheetView.frame = sheetViewF;
        self.alpha = 0.0;
    } completion:^(BOOL finished) {
        [self removeFromSuperview];
        [self.sheetView removeFromSuperview];
    }];
}

- (void)sheetBtnClick:(UIButton *)btn{
    ActionSheetItem *item = _items[btn.tag];
    
    if (item.index == 0) {
        [self coverClick];
        return;
    }
    if (self.clickBlock) {
        self.clickBlock(item);
    }
    
    [self coverClick];
}

//根据颜色生成图片
- (UIImage*)imageWithColor:(UIColor*)color
{
    CGRect rect=CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);
    UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return theImage;
}


@end

    ActionSheetView *sheetView = [[ActionSheetView alloc] initWithCancleTitle:@"取消" otherTitles:@"1",@"2" ,@"3",@"4",nil];
    
    [sheetView show];
    sheetView.clickBlock = ^(ActionSheetItem *item)
    {
        NSLog(@"%@--%zd",item.title,item.index);
    };