第十九篇、坐标转换，弹出下拉选择框

.h

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>


typedef NS_ENUM(NSInteger,Type) {
    cityType,
    recommentType,
    classifyType
};
/*
 
  使用方式
 NSArray *array = [NSArray arrayWithObjects:@"1222",@"1222",@"1222",@"1222",@"1222", nil];
 _selectedTypeView = [[SelectedTypeView alloc ]initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height) button:but dataArray:array];
 */


@protocol SelectedTypeViewDelegate <NSObject>

@optional
- (void) seletedTypeFinish:(NSString *)typeString index:(NSInteger)index type:(Type)type;

@end

@interface SelectedTypeView : UIView

- (id)initWithFrame:(CGRect)frame button:(UIButton *)typeButton dataArray:(NSArray *)arry type:(Type) type;

@property (nonatomic,weak) id<SelectedTypeViewDelegate>delegate;

@end

.m

#import "SelectedTypeView.h"
#import "MainCityModel.h"
#import "MainCitySportModel.h"
#import "MainOpenCityModel.h"

@interface SelectedTypeView ()<UITableViewDelegate,UITableViewDataSource,UIGestureRecognizerDelegate>
{
    CGRect _rect;
}

@property (strong,nonatomic) UITableView *contentTableView;
@property (strong, nonatomic) UIView *backgroundView;
@property (strong,nonatomic) UIButton *button;
@property (strong,nonatomic) NSArray *dataArray;
@property (assign, nonatomic) Type type;

@end

@implementation SelectedTypeView


// 懒加载
-(UITableView *)contentTableView
{
    if (! _contentTableView) {
        UITableView *tableView = [[UITableView alloc]init];
        tableView.delegate = self;
        tableView.dataSource = self;
        tableView.rowHeight = 44;
        _contentTableView = tableView;
    }
    return _contentTableView;
}

- (id)initWithFrame:(CGRect)frame button:(UIButton *)typeButton dataArray:(NSArray *)arry type:(Type) type
{
    self = [super initWithFrame:frame];
    if (self) {
        _rect = frame;
        _button = typeButton;
        _dataArray = [NSArray arrayWithArray:arry];
        self.type = type;
        [self setupUI];
    }
    return self;
}

// 初始化UI
- (void) setupUI
{
    UIWindow *window = [[UIApplication sharedApplication] delegate].window;
    UIView *backgroundView = [[UIView alloc]initWithFrame:_rect];
    backgroundView.backgroundColor = [UIColor colorWithRed:1 green:1 blue:1 alpha:0];
    [window addSubview:backgroundView];
    _backgroundView = backgroundView;
    
    // 添加手势
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(diss)];
    tap.delegate = self;
    [backgroundView addGestureRecognizer:tap];
    
    // 转换坐标
    CGRect buttonRect = [window convertRect:_button.frame fromView:_button.superview];
    CGFloat screenHeight = [UIScreen mainScreen].bounds.size.height;
    CGFloat tableViewY = buttonRect.origin.y + buttonRect.size.height;
    

    
     self.contentTableView.transform = CGAffineTransformMakeScale(1.0, 0);
    
    // 设置描点
    _contentTableView.layer.anchorPoint = CGPointMake(0.5, 0);
//    _contentTableView.layer.position = CGPointMake(0, 0);
    
    [UIView animateWithDuration:0.3 animations:^{
        
        // 进行还原
        _contentTableView.transform = CGAffineTransformIdentity;
    }];
    self.contentTableView.frame = CGRectMake(0, tableViewY, [UIScreen mainScreen].bounds.size.width, (_dataArray.count * 44.0 + tableViewY) > screenHeight ? (screenHeight - tableViewY) : _dataArray.count * 44.0 );
    
    [backgroundView addSubview:_contentTableView];
}

#pragma mark------UITableViewDatasource Methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return self.dataArray.count;
}

- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *ID = @"ID";
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
    
    if (cell == nil) {
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:ID];
    }
    cell.accessoryType=UITableViewCellAccessoryDisclosureIndicator;
    switch (_type) {
        case cityType:
        {
            if (0 == indexPath.row) {
                cell.textLabel.text = _dataArray[indexPath.row];
            }else{
                MainOpenCityListListModel *list=_dataArray[indexPath.row];
                cell.textLabel.text=list.shortname;
            }

        }
            break;
        case recommentType:
        {
            cell.textLabel.text = [_dataArray objectAtIndex:indexPath.row];
        }
            break;
        case classifyType:
        {
            if (0 == indexPath.row) {
                cell.textLabel.text = _dataArray[indexPath.row];
            }else{
                MainCitySportListModel *list = _dataArray[indexPath.row];
                cell.textLabel.text=list.name;
            }
        }
            break;
            
        default:
            break;
    }
    

    
    return cell;
}

#pragma mark------UITableViewDelegate Methods
- (void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    
    [self diss];
    
    if ([_delegate respondsToSelector:@selector(seletedTypeFinish:index: type:)]) {
        [_delegate seletedTypeFinish:[_dataArray objectAtIndex:indexPath.row] index:indexPath.row type:_type];
    }
    
}

#pragma mark----private Methods
// 去掉当前View
- (void) diss
{
    _backgroundView.alpha = 1.0;
    [UIView animateWithDuration:0.3 animations:^{
        _contentTableView.transform = CGAffineTransformMakeScale(1.0, 0.000001);
        //_backgroundView.alpha = 0.0;
    } completion:^(BOOL finished) {
        [_backgroundView removeFromSuperview];
    }];
    

}

- (void) removeCurrentView
{
    
}

#pragma mark-----gestureRecognizerDelegate

/**
 * @brief 手势的代理方法
 */
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
    NSLog(@"class %@",touch.view);
    
    if (touch.view == _backgroundView )
    {
        return YES;
    }
    return NO;
}

@end