IOS 自定义下拉选择控件

#import <UIKit/UIKit.h>

@interface DropDown : UIView <UITableViewDelegate,UITableViewDataSource,UITextFieldDelegate> {

UITableView *tv;//下拉列表

NSArray *tableArray;//下拉列表数据

UITextField *textField;//文本输入框

BOOL showList;//是否弹出下拉列表

CGFloat tabheight;//table下拉列表的高度

CGFloat frameHeight;//frame的高度

}

@property (nonatomic,retain) UITableView *tv;

@property (nonatomic,retain) NSArray *tableArray;

@property (nonatomic,retain) UITextField *textField;

@end

#import "DropDown.h"

@implementation DropDown

@synthesize tv,tableArray,textField;

-(id)initWithFrame:(CGRect)frame

{

if (frame.size.height<200) {
frameHeight = 200;
}else{
frameHeight = frame.size.height;
}
//    tabheight = frameHeight-30;
tabheight = 70;
frame.size.height = 30.0f;
self=[super initWithFrame:frame];
if(self){
showList = NO; //默认不显示下拉框
tv = [[UITableView alloc] initWithFrame:CGRectMake(0, 30, frame.size.width, 0)];
tv.delegate = self;
tv.dataSource = self;
tv.backgroundColor = [UIColor grayColor];
tv.separatorColor = [UIColor lightGrayColor];
tv.hidden = YES;
[self addSubview:tv];

textField = [[UITextField alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, 30)];
textField.borderStyle=UITextBorderStyleRoundedRect;//设置文本框的边框风格
[textField addTarget:self action:@selector(dropdown) forControlEvents:UIControlEventAllTouchEvents];
[self addSubview:textField];
textField.delegate = self;//这一句要加入代理
}
return self;
}
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
return NO;
}
-(void)dropdown{

[textField resignFirstResponder];
if (showList) {//如果下拉框已显示，什么都不做
return;
}else {//如果下拉框尚未显示，则进行显示
CGRect sf = self.frame;
sf.size.height = frameHeight;
//把dropdownList放到前面，防止下拉框被别的控件遮住
[self.superview bringSubviewToFront:self];
tv.hidden = NO;
showList = YES;//显示下拉框

CGRect frame = tv.frame;
frame.size.height = 0;
tv.frame = frame;
frame.size.height = tabheight;
[UIView beginAnimations:@"ResizeForKeyBoard" context:nil];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
self.frame = sf;
tv.frame = frame;
[UIView commitAnimations];
}
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}

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

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

static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.textLabel.text = [tableArray objectAtIndex:[indexPath row]];
cell.textLabel.font = [UIFont systemFontOfSize:16.0f];
cell.accessoryType = UITableViewCellAccessoryNone;
cell.selectionStyle = UITableViewCellSelectionStyleGray;

return cell;

}

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 35;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
textField.text = [tableArray objectAtIndex:[indexPath row]];
showList = NO;
tv.hidden = YES;

CGRect sf = self.frame;
sf.size.height = 30;
self.frame = sf;

CGRect frame = tv.frame;
frame.size.height = 0;
tv.frame = frame;

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

@end

DropDown *dropDown = [[DropDown alloc] initWithFrame:CGRectMake(100, 40, 150, 30)];
dropDown.textField.placeholder = @"请选择购买时长";
dropDown.tableArray = dataSource;
[self.view addSubview:dropDown];