iOS下拉选择菜单简单封装

本文实例为大家分享了简单封装的iOS下拉选择菜单代码，供大家参考，具体内容如下

//
// OrderListDownMenu.h 

#import <UIKit/UIKit.h> 

@protocol OrderListDownMenuDelegate <NSObject> 

- (void)OrderListDownMenu:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath; 

@end 

typedef void(^Dismiss)(void); 

@interface OrderListDownMenu : UIView<UITableViewDataSource, UITableViewDelegate> 

@property (nonatomic, strong) UITableView *tableView;
@property (nonatomic, assign) id<OrderListDownMenuDelegate> delegate;
@property (nonatomic, strong) NSArray *arrData;
@property (nonatomic, strong) NSArray *arrImgName;
@property (nonatomic, copy) Dismiss dismiss; 

- (instancetype)initWithDataArr:(NSArray *)dataArr origin:(CGPoint)origin width:(CGFloat)width rowHeight:(CGFloat)rowHeight; 

- (void)dismissWithCompletion:(void (^)(OrderListDownMenu *object))completion; 

@end

#import "OrderListDownMenu.h" 

#define TopToView 63.0f
#define rightToView kScreenWidth - 15.0f
#define LeftToView kScreenWidth - 145.0 - 10.0f
#define CellLineEdgeInsets UIEdgeInsetsMake(0, -80, 0, 0)
#define kScreenWidth    [UIScreen mainScreen].bounds.size.width
#define kScreenHeight    [UIScreen mainScreen].bounds.size.height 

@interface OrderListDownMenu() 

@property (nonatomic, assign) CGPoint origin;
@property (nonatomic, assign) CGFloat rowHeight; 

@end 

@implementation OrderListDownMenu 

- (instancetype)initWithDataArr:(NSArray *)dataArr origin:(CGPoint)origin width:(CGFloat)width rowHeight:(CGFloat)rowHeight { 

  self = [super initWithFrame:CGRectMake(0, 0, kScreenWidth, kScreenHeight)];
  if (self) {
    if (rowHeight <= 0) {
      rowHeight = 50;
    } 

    // 设置背景颜色
    self.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.2];
    self.origin = origin;
    self.rowHeight = rowHeight;
    self.arrData = [dataArr copy];
    self.tableView = [[UITableView alloc] initWithFrame:CGRectMake(origin.x + LeftToView, origin.y + TopToView, width, rowHeight * dataArr.count) style:UITableViewStylePlain];
    _tableView.dataSource = self;
    _tableView.delegate = self;
    [self addSubview:_tableView]; 

    _tableView.backgroundColor = [UIColor whiteColor];
    _tableView.layer.cornerRadius = 2;
    _tableView.bounces = NO;
    _tableView.layer.cornerRadius = 8;
    _tableView.separatorColor = [UIColor colorWithWhite:0.3 alpha:1]; 

    _tableView.separatorStyle = UITableViewCellSelectionStyleNone;
    [_tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"]; 

    if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)]) {
      [self.tableView setSeparatorInset:CellLineEdgeInsets];
    } 

    if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)]) {
      [self.tableView setLayoutMargins:CellLineEdgeInsets];
    }
  }
  return self;
} 

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

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
  return self.arrData.count;
} 

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
  return self.rowHeight;
} 

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 

  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
  cell.textLabel.textColor = THEME_COLOR_GRAY_1;
  cell.textLabel.font = [UIFont systemFontOfSize:15];
  cell.textLabel.text = self.arrData[indexPath.row]; 

  if (self.arrImgName.count > indexPath.row) {
    cell.imageView.image = [UIImage imageNamed:self.arrImgName[indexPath.row]];
    cell.imageView.contentMode = UIViewContentModeScaleAspectFit;
  } 

  UILabel *label = [[UILabel alloc] init];
  label.frame = CGRectMake(0, 49, _tableView.frame.size.width, 0.5);
  label.backgroundColor = THEME_SEPARATOR_COLOR;
  [cell.contentView addSubview:label]; 

  return cell;
} 

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { 

  if([self.delegate respondsToSelector:@selector(OrderListDownMenu:didSelectRowAtIndexPath:)]){
    [self.delegate OrderListDownMenu:tableView didSelectRowAtIndexPath:indexPath];
  } 

  [tableView deselectRowAtIndexPath:indexPath animated:YES];
  [self dismissWithCompletion:nil];
} 

- (void)dismissWithCompletion:(void (^)(OrderListDownMenu *object))completion { 

  __weak __typeof(self) weakSelf = self;
  [UIView animateWithDuration:0.2 animations:^{
    weakSelf.alpha = 0;
    weakSelf.tableView.frame = CGRectMake(weakSelf.origin.x + LeftToView + 145, weakSelf.origin.y + TopToView, 0, 0);
  } completion:^(BOOL finished) {
    [weakSelf removeFromSuperview];
    if (completion) {
      completion(weakSelf);
    }
    if (weakSelf.dismiss) {
      weakSelf.dismiss();
    }
  }];
} 

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { 

  UITouch *touch = [touches anyObject];
  if (![touch.view isEqual:self.tableView]) {
    [self dismissWithCompletion:nil];
  }
} 

- (void)drawRect:(CGRect)rect { 

  //[colors[serie] setFill]; 

  //拿到当前视图准备好的画板 

  CGContextRef context = UIGraphicsGetCurrentContext(); 

  //利用path进行绘制三角形 

  CGContextBeginPath(context);//标记 

  CGContextMoveToPoint(context,
             rightToView - 13, 53);//设置起点 

  CGContextAddLineToPoint(context,
              rightToView - 21, TopToView); 

  CGContextAddLineToPoint(context,
              rightToView - 4, TopToView); 

  CGContextClosePath(context);//路径结束标志，不写默认封闭 

  [self.tableView.backgroundColor setFill]; //设置填充色 

  [self.tableView.backgroundColor setStroke]; //设置边框颜色 

  CGContextDrawPath(context,
           kCGPathFillStroke);//绘制路径path
} 

@end 

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