ios 下拉列表

#import <UIKit/UIKit.h>

@class FVPullDownMenu;

/** 指示器状态*/
typedef enum
{
    IndicatorStateShow = 0,
    IndicatorStateHide
}
IndicatorStatus;

/** 视图状态*/
typedef enum
{
    BackGroundViewStatusShow = 0,
    BackGroundViewStatusHide
}
BackGroundViewStatus;

/**  选择回调 协议*/
@protocol FVPullDownMenuDelegate <NSObject>

- (void)PullDownMenu:(FVPullDownMenu *)pullDownMenu didSelectRowAtColumn:(NSInteger)column row:(NSInteger)row;

@end

@interface FVPullDownMenu : UIView<UITableViewDelegate, UITableViewDataSource>

- (FVPullDownMenu *)initWithArray:(NSArray *)array selectedColor:(UIColor *)color;

@property (nonatomic) id<FVPullDownMenuDelegate> delegate;

@end


/** CALayer 扩展*/
@interface CALayer (FVAddAnimationAndValue)

- (void)addAnimation:(CAAnimation *)anim andValue:(NSValue *)value forKeyPath:(NSString *)keyPath;

@end

 .m

#import "FVPullDownMenu.h"

@implementation FVPullDownMenu
{
    
    UIColor *_menuColor;
    
    
    UIView *_backGroundView;
    UITableView *_tableView;
    
    NSMutableArray *_titles;
    NSMutableArray *_indicators;
    
    
    NSInteger _currentSelectedMenudIndex;
    bool _show;
    
    NSInteger _numOfMenu;
    
    NSArray *_array;
    
}

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    
    if (self) {
        
        
    }
    return self;
}

- (FVPullDownMenu *)initWithArray:(NSArray *)array selectedColor:(UIColor *)color
{
    self = [super init];
    if (self) {
        
        self.frame = CGRectMake(0, 0, 160, 30);
        
        self.layer.borderWidth = 1;
        self.layer.borderColor =  [[UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.3] CGColor];
        
        
        _menuColor = [UIColor colorWithRed:164.0/255.0 green:166.0/255.0 blue:169.0/255.0 alpha:1.0];
        
        _array = array;
        
        _numOfMenu = 1; //_array.count; //需要多列的话换成_array.count
        
        CGFloat textLayerInterval = self.frame.size.width / ( _numOfMenu * 2);
        CGFloat separatorLineInterval = self.frame.size.width / _numOfMenu;
        
        _titles = [[NSMutableArray alloc] initWithCapacity:_numOfMenu];
        _indicators = [[NSMutableArray alloc] initWithCapacity:_numOfMenu];
        
        
        for (int i = 0; i < _numOfMenu; i++) {
            
            CGPoint position = CGPointMake( (i * 2 + 1) * textLayerInterval , self.frame.size.height / 2);
            CATextLayer *title = [self creatTextLayerWithNSString:_array[i][0][@"title"] withColor:_menuColor andPosition:position];
            [self.layer addSublayer:title];
            [_titles addObject:title];
            
            
            CAShapeLayer *indicator = [self creatIndicatorWithColor:_menuColor andPosition:CGPointMake(position.x + title.bounds.size.width / 2 + 8, self.frame.size.height / 2)];
            [self.layer addSublayer:indicator];
            [_indicators addObject:indicator];
            
            if (i != _numOfMenu - 1) {
                CGPoint separatorPosition = CGPointMake((i + 1) * separatorLineInterval, self.frame.size.height / 2);
                CAShapeLayer *separator = [self creatSeparatorLineWithColor:[UIColor colorWithRed:239.0/255.0 green:239.0/255.0 blue:243.0/255.0 alpha:1.0] andPosition:separatorPosition];
                [self.layer addSublayer:separator];
            }
            
        }
        _tableView = [self creatTableViewAtPosition:CGPointMake(0, self.frame.origin.y + self.frame.size.height)];
        _tableView.tintColor = color;
        _tableView.dataSource = self;
        _tableView.delegate = self;
        
        // 设置menu, 并添加手势
        self.backgroundColor = [UIColor whiteColor];
        UIGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapMenu:)];
        [self addGestureRecognizer:tapGesture];
        
        // 创建背景
        _backGroundView = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds];
        _backGroundView.backgroundColor = [UIColor colorWithWhite:0.0 alpha:0.0];
        _backGroundView.opaque = NO;
        UIGestureRecognizer *gesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapBackGround:)];
        [_backGroundView addGestureRecognizer:gesture];
        
        _currentSelectedMenudIndex = -1;
        _show = NO;
    }
    return self;
}



#pragma mark - tapEvent

// 处理菜单点击事件.
- (void)tapMenu:(UITapGestureRecognizer *)paramSender
{
    
    CGPoint touchPoint = [paramSender locationInView:self];
    
    // 得到tapIndex
    
    NSInteger tapIndex = touchPoint.x / (self.frame.size.width / _numOfMenu);
    
    
    
    for (int i = 0; i < _numOfMenu; i++) {
        if (i != tapIndex) {
            [self animateIndicator:_indicators[i] Forward:NO complete:^{
                [self animateTitle:_titles[i] show:NO complete:^{
                }];
            }];
        }
    }
    
    
    if (tapIndex == _currentSelectedMenudIndex && _show) {
        
        [self animateIdicator:_indicators[_currentSelectedMenudIndex] background:_backGroundView tableView:_tableView title:_titles[_currentSelectedMenudIndex] forward:NO complecte:^{
            _currentSelectedMenudIndex = tapIndex;
            _show = NO;
            
        }];
        
    } else {
        
        _currentSelectedMenudIndex = tapIndex;
        [_tableView reloadData];
        [self animateIdicator:_indicators[tapIndex] background:_backGroundView tableView:_tableView title:_titles[tapIndex] forward:YES complecte:^{
            _show = YES;
        }];
        
    }
    
    
    
}

- (void)tapBackGround:(UITapGestureRecognizer *)paramSender
{
    
    
    
    [self animateIdicator:_indicators[_currentSelectedMenudIndex] background:_backGroundView tableView:_tableView title:_titles[_currentSelectedMenudIndex] forward:NO complecte:^{
        _show = NO;
    }];
    
}


#pragma mark - tableViewDelegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    
    [self confiMenuWithSelectRow:indexPath.row];
    [self.delegate PullDownMenu:self didSelectRowAtColumn:_currentSelectedMenudIndex row:indexPath.row];
    
}


#pragma mark tableViewDataSource

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [_array[_currentSelectedMenudIndex] count];
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];
        cell.textLabel.font = [UIFont systemFontOfSize:13.0];
    }
    
    [cell.textLabel setTextColor:[UIColor grayColor]];
    [cell setAccessoryType:UITableViewCellAccessoryNone];
    cell.textLabel.text = _array[_currentSelectedMenudIndex][indexPath.row][@"title"];
    
    if (cell.textLabel.text == [(CATextLayer *)[_titles objectAtIndex:_currentSelectedMenudIndex] string]) {
        [cell setAccessoryType:UITableViewCellAccessoryCheckmark];
        [cell.textLabel setTextColor:[tableView tintColor]];
    }
    
    return cell;
}





#pragma mark - animation

- (void)animateIndicator:(CAShapeLayer *)indicator Forward:(BOOL)forward complete:(void(^)())complete
{
    [CATransaction begin];
    [CATransaction setAnimationDuration:0.25];
    [CATransaction setAnimationTimingFunction:[CAMediaTimingFunction functionWithControlPoints:0.4 :0.0 :0.2 :1.0]];
    
    CAKeyframeAnimation *anim = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation"];
    anim.values = forward ? @[ @0, @(M_PI) ] : @[ @(M_PI), @0 ];
    
    if (!anim.removedOnCompletion) {
        [indicator addAnimation:anim forKey:anim.keyPath];
    } else {
        [indicator addAnimation:anim andValue:anim.values.lastObject forKeyPath:anim.keyPath];
    }
    
    [CATransaction commit];
    
    indicator.fillColor = forward ? _tableView.tintColor.CGColor : _menuColor.CGColor;
    
    complete();
}





- (void)animateBackGroundView:(UIView *)view show:(BOOL)show complete:(void(^)())complete
{
    
    if (show) {
        
        [self.superview addSubview:view];
        [view.superview addSubview:self];
        
        [UIView animateWithDuration:0.2 animations:^{
            view.backgroundColor = [UIColor colorWithWhite:0.0 alpha:0.3];
        }];
        
    } else {
        [UIView animateWithDuration:0.2 animations:^{
            view.backgroundColor = [UIColor colorWithWhite:0.0 alpha:0.0];
        } completion:^(BOOL finished) {
            [view removeFromSuperview];
        }];
        
    }
    complete();
    
}

- (void)animateTableView:(UITableView *)tableView show:(BOOL)show complete:(void(^)())complete
{
    if (show) {
        
        
        tableView.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y + self.frame.size.height, self.frame.size.width, 0);
        [self.superview addSubview:tableView];
        
        
        CGFloat tableViewHeight = ([tableView numberOfRowsInSection:0] > 5) ? (5 * tableView.rowHeight) : ([tableView numberOfRowsInSection:0] * tableView.rowHeight);
        
        [UIView animateWithDuration:0.2 animations:^{
            _tableView.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y + self.frame.size.height, self.frame.size.width, tableViewHeight);
        }];
        
    } else {
        
        [UIView animateWithDuration:0.2 animations:^{
            _tableView.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y + self.frame.size.height, self.frame.size.width, 0);
        } completion:^(BOOL finished) {
            [tableView removeFromSuperview];
        }];
        
        
    }
    complete();
    
}

- (void)animateTitle:(CATextLayer *)title show:(BOOL)show complete:(void(^)())complete
{
    if (show) {
        title.foregroundColor = _tableView.tintColor.CGColor;
    } else {
        title.foregroundColor = _menuColor.CGColor;
    }
    CGSize size = [self calculateTitleSizeWithString:title.string];
    CGFloat sizeWidth = (size.width < (self.frame.size.width / _numOfMenu) - 25) ? size.width : self.frame.size.width / _numOfMenu - 25;
    title.bounds = CGRectMake(0, 0, sizeWidth, size.height);
    
    
    complete();
}

- (void)animateIdicator:(CAShapeLayer *)indicator background:(UIView *)background tableView:(UITableView *)tableView title:(CATextLayer *)title forward:(BOOL)forward complecte:(void(^)())complete{
    
    [self animateIndicator:indicator Forward:forward complete:^{
        [self animateTitle:title show:forward complete:^{
            [self animateBackGroundView:background show:forward complete:^{
                [self animateTableView:tableView show:forward complete:^{
                }];
            }];
        }];
    }];
    
    complete();
}


#pragma mark - drawing


- (CAShapeLayer *)creatIndicatorWithColor:(UIColor *)color andPosition:(CGPoint)point
{
    CAShapeLayer *layer = [CAShapeLayer new];
    
    UIBezierPath *path = [UIBezierPath new];
    [path moveToPoint:CGPointMake(0, 0)];
    [path addLineToPoint:CGPointMake(8, 0)];
    [path addLineToPoint:CGPointMake(4, 5)];
    [path closePath];
    
    layer.path = path.CGPath;
    layer.lineWidth = 1.0;
    layer.fillColor = color.CGColor;
    
    CGPathRef bound = CGPathCreateCopyByStrokingPath(layer.path, nil, layer.lineWidth, kCGLineCapButt, kCGLineJoinMiter, layer.miterLimit);
    layer.bounds = CGPathGetBoundingBox(bound);
    CGPathRelease(bound);
    layer.position = point;
    
    return layer;
}

- (CAShapeLayer *)creatSeparatorLineWithColor:(UIColor *)color andPosition:(CGPoint)point
{
    CAShapeLayer *layer = [CAShapeLayer new];
    
    UIBezierPath *path = [UIBezierPath new];
    [path moveToPoint:CGPointMake(160,0)];
    [path addLineToPoint:CGPointMake(160, 20)];
    
    layer.path = path.CGPath;
    layer.lineWidth = 1.0;
    layer.strokeColor = color.CGColor;
    
    CGPathRef bound = CGPathCreateCopyByStrokingPath(layer.path, nil, layer.lineWidth, kCGLineCapButt, kCGLineJoinMiter, layer.miterLimit);
    layer.bounds = CGPathGetBoundingBox(bound);
    CGPathRelease(bound);
    layer.position = point;
    
    return layer;
}

- (CATextLayer *)creatTextLayerWithNSString:(NSString *)string withColor:(UIColor *)color andPosition:(CGPoint)point
{
    
    CGSize size = [self calculateTitleSizeWithString:string];
    
    CATextLayer *layer = [CATextLayer new];
    CGFloat sizeWidth = (size.width < (self.frame.size.width / _numOfMenu) - 25) ? size.width : self.frame.size.width / _numOfMenu - 25;
    layer.bounds = CGRectMake(0, 0, sizeWidth, size.height);
    layer.string = string;
    layer.fontSize = 13.0;
    layer.alignmentMode = kCAAlignmentCenter;
    layer.foregroundColor = color.CGColor;
    
    layer.contentsScale = [[UIScreen mainScreen] scale];
    
    layer.position = point;
    
    return layer;
}


- (UITableView *)creatTableViewAtPosition:(CGPoint)point
{
    UITableView *tableView = [UITableView new];
    
    tableView.frame = CGRectMake(point.x, point.y, self.frame.size.width, 0);
    tableView.rowHeight = 25;
    
    return tableView;
}


#pragma mark - otherMethods


- (CGSize)calculateTitleSizeWithString:(NSString *)string
{
    CGFloat fontSize = 13.0;
    NSDictionary *dic = @{NSFontAttributeName: [UIFont systemFontOfSize:fontSize]};
    CGSize size = [string boundingRectWithSize:CGSizeMake(280, 0) options:NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:dic context:nil].size;
    return size;
}

- (void)confiMenuWithSelectRow:(NSInteger)row
{
    
    CATextLayer *title = (CATextLayer *)_titles[_currentSelectedMenudIndex];
    
    title.string = [[_array objectAtIndex:_currentSelectedMenudIndex] objectAtIndex:row][@"title"];
    
    
    [self animateIdicator:_indicators[_currentSelectedMenudIndex] background:_backGroundView tableView:_tableView title:_titles[_currentSelectedMenudIndex] forward:NO complecte:^{
        _show = NO;
        
    }];
    
    CAShapeLayer *indicator = (CAShapeLayer *)_indicators[_currentSelectedMenudIndex];
    indicator.position = CGPointMake(title.position.x + title.frame.size.width / 2 + 8, indicator.position.y);
}


@end

#pragma mark - CALayer Category

@implementation CALayer (FVAddAnimationAndValue)

- (void)addAnimation:(CAAnimation *)anim andValue:(NSValue *)value forKeyPath:(NSString *)keyPath
{
    [self addAnimation:anim forKey:keyPath];
    [self setValue:value forKeyPath:keyPath];
}


@end

 数据格式

数据格式

NSArray * testArray = @[
                            @[
                                @{@"title":@"1111@qq.com" ,@"uid": @"111"},
                                @{@"title":@"2222@qq.com" ,@"uid": @"222"},
                                @{@"title":@"3333@qq.com" ,@"uid": @"333"}
                                ],
                            @[@""]
                            ];

 使用

NSInteger selectrow;


FVPullDownMenu *menu = [[FVPullDownMenu alloc] initWithArray:_accountArray selectedColor:[UIColor colorWithRed:32/255.0 green:144/255.0 blue:21/255.0 alpha:1.0]];
    menu.delegate = self;
    menu.frame = CGRectMake(110, 16, 160, 30);
    [self.view addSubview:menu];

//委托回调方法
- (void)PullDownMenu:(FVPullDownMenu *)pullDownMenu didSelectRowAtColumn:(NSInteger)column row:(NSInteger)row
{
    selectrow = row;
}

//得到选择的数据
 NSString * title = testArray[0][selectrow][@"title"];