屌炸天的下拉菜单MKDropdownMenu

效果图：

实现代码：

#define KWidth    [UIScreen mainScreen].bounds.size.width

#import "ViewController.h"

#import "UIColor+HCHex.h"

//导入主头文件

#import "MKDropdownMenu.h"

@interface ViewController ()<MKDropdownMenuDataSource,MKDropdownMenuDelegate>

{

    NSArray* foodArray;

    NSArray* discountsArray;

}

@property (nonatomic, strong)MKDropdownMenu *topDropMenu;

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    self.topDropMenu = [[MKDropdownMenu alloc] initWithFrame:CGRectMake(0, 159, KWidth, 35)];

    self.topDropMenu.dataSource = self;

    self.topDropMenu.delegate = self;

    self.topDropMenu.layer.borderColor = [[UIColor hex_C2C2C2_Color] CGColor];

    self.topDropMenu.layer.borderWidth = 0.5;

    self.topDropMenu.disclosureIndicatorImage = [UIImage imageNamed:@"voucher_down.png"];

    self.topDropMenu.dropdownShowsTopRowSeparator = NO;

    self.topDropMenu.dropdownShowsBottomRowSeparator = NO;

    self.topDropMenu.dropdownShowsBorder = YES;

    self.topDropMenu.backgroundColor = [UIColor clearColor];

    self.topDropMenu.componentSeparatorColor = [UIColor hex_929292_Color];

    

    [self.view addSubview:_topDropMenu];

    

    foodArray = @[@"全部美食",@"本帮上海菜",@"日本菜",@"咖啡厅",@"小吃快餐",@"面包甜点",@"火锅",@"西餐",@"自助餐",@"粤菜",@"韩国料理",@"小龙虾",@"轻食",@"东北菜"];

    discountsArray = @[@"全部",@"0-30元",@"30-50元",@"50元以上",@"折扣优惠券"];

}

#pragma mark - MKDropdownMenuDataSource

- (NSInteger)numberOfComponentsInDropdownMenu:(MKDropdownMenu *)dropdownMenu {

    return 2;

}

- (NSInteger)dropdownMenu:(MKDropdownMenu *)dropdownMenu numberOfRowsInComponent:(NSInteger)component {

    

    switch (component) {

        case 0:

            return foodArray.count;

        case 1:

            return discountsArray.count;

        default:

            return 0;

    }

    

}

#pragma mark - MKDropdownMenuDelegate

- (CGFloat)dropdownMenu:(MKDropdownMenu *)dropdownMenu rowHeightForComponent:(NSInteger)component {

    return 35; // default row height

}

- (BOOL)dropdownMenu:(MKDropdownMenu *)dropdownMenu shouldUseFullRowWidthForComponent:(NSInteger)component {

    return YES;

}

- (NSAttributedString *)dropdownMenu:(MKDropdownMenu *)dropdownMenu attributedTitleForComponent:(NSInteger)component {

    

    NSString *title;

    if (component == 0) {

        title = @"美食";

    } else {

        title = @"优惠";

    }

    

    return [[NSAttributedString alloc] initWithString:title attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:12.0],NSForegroundColorAttributeName: [UIColor hex_3A3B3C_Color]}];

}

- (NSAttributedString *)dropdownMenu:(MKDropdownMenu *)dropdownMenu attributedTitleForSelectedComponent:(NSInteger)component {

    NSString *title;

    if (component == 0) {

        title = @"美食";

    } else {

        title = @"优惠";

    }

    

    return [[NSAttributedString alloc] initWithString:title attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:12.0],NSForegroundColorAttributeName: [UIColor redColor]}];

}

- (NSAttributedString *)dropdownMenu:(MKDropdownMenu *)dropdownMenu attributedTitleForRow:(NSInteger)row forComponent:(NSInteger)component {

    

    NSString *rowTitle;

    if (component == 0) {

        rowTitle = foodArray[row];

    } else if (component == 1) {

        rowTitle = discountsArray[row];

    }

    return [[NSAttributedString alloc] initWithString:rowTitle attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:10.0],NSForegroundColorAttributeName: [UIColor hex_3A3B3C_Color]}];

}

- (UIColor *)dropdownMenu:(MKDropdownMenu *)dropdownMenu backgroundColorForRow:(NSInteger)row forComponent:(NSInteger)component {

    return [UIColor clearColor];

}

- (void)dropdownMenu:(MKDropdownMenu *)dropdownMenu didSelectRow:(NSInteger)row inComponent:(NSInteger)component {

    

    [dropdownMenu closeAllComponentsAnimated:YES];

    NSLog(@"选择了第 %ld 列的第 %ld 行",(long)component,(long)row);

}

@end