iphone开发之自定义下拉列表UIcombobox控件

很多时候我们都会用到下拉列表框，闲着没事自己实现了一个共享之。

代码如下：

//
//  CLOCombobox.h
//  CLOComboboxText
//
//  Created by Cloay on 12-8-9.
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface CLOCombobox : UIView<UITableViewDelegate, UITableViewDataSource>{
    NSArray *array;
    UITextField *textField;
    UITableView *comboboxItems;
}
- (id)initWithFrame:(CGRect)frame withItems:(NSArray *)items withSuperView:(UIView *)view;
@end

实现如下：

//
//  CLOCombobox.m
//  CLOComboboxText
//
//  Created by Cloay on 12-8-9.
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
//

#import "CLOCombobox.h"

#define itemHeight 35
#define tableviewHeight 180
@implementation CLOCombobox

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

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    // Drawing code
}
*/

- (id)initWithFrame:(CGRect)frame withItems:(NSArray *)items withSuperView:(UIView *)view{
    self = [super initWithFrame:frame];
    [self setBackgroundColor:[UIColor clearColor]];
    
    //文本框
    textField = [[UITextField alloc] initWithFrame:CGRectMake(0, 4, frame.size.width, frame.size.height - 4)];
    [textField setBorderStyle:UITextBorderStyleRoundedRect];
    [textField setBackgroundColor:[UIColor whiteColor]];
    [textField setEnabled:NO];
//    [textField setB]
//    [textField setTextAlignment:UITextAlignmentCenter];
    //默认显示0处的文字
    textField.text = [items objectAtIndex:0];
    [self addSubview:textField];
    
    //下拉按钮
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setFrame:CGRectMake(4*frame.size.width/5, 0, frame.size.height, frame.size.height)];
    [button setImage:[UIImage imageNamed:@"arrow_down"] forState:UIControlStateNormal];
    [button addTarget:self action:@selector(buttonDidPressed:) forControlEvents:UIControlEventTouchUpInside];
    [self addSubview:button];
    
    array = [items mutableCopy];
    
    comboboxItems = [[UITableView alloc] initWithFrame:CGRectMake(frame.origin.x, frame.origin.y + frame.size.height, self.frame.size.width, tableviewHeight) style:UITableViewStyleGrouped];
    comboboxItems.bounces = NO;
    comboboxItems.delegate = self;
    comboboxItems.dataSource = self;
    comboboxItems.hidden = YES;
    
    [comboboxItems setBackgroundColor:[UIColor clearColor]];
    [view addSubview:comboboxItems];
    return self;
}

- (void)buttonDidPressed:(id)sender{

    comboboxItems.hidden = NO;
}

#pragma mark - 
#pragma mark - table view data source

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

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    return 1;
}

- (float)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    return itemHeight;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    static NSString *identifier = @"CELL";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
        [cell.textLabel setFont:[UIFont systemFontOfSize:14]];
        [cell setSelectionStyle:UITableViewCellEditingStyleNone];
    }
    cell.textLabel.text = [array objectAtIndex:[indexPath row]];
    return cell;
}

#pragma mark - table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    NSLog(@"row - >%i", [indexPath row]);
    //选中后显示
    textField.text = [array objectAtIndex:[indexPath row]];
    comboboxItems.hidden = YES;
}
@end

代码比较简单，就不过多解释了。

有问题请留言，大家一起交流学习！

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