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iphone 实现下拉菜单

iphone 实现下拉菜单
代码如下:
@interface DropDown1 : UIView <UITableViewDelegate,UITableViewDataSource> {
 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
//****************************************************************************
@implementation DropDown1
@synthesize tv,tableArray,textField;
- (void)dealloc
{
[tv release];
[tableArray release];
[textField release];
[super dealloc];
}
-(id)initWithFrame:(CGRect)frame
{
if (frame.size.height<200) {
frameHeight = 200;
}else{
frameHeight = frame.size.height;
}
tabheight = frameHeight-30;
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];  
    }
    return self;
}
-(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] autorelease];
    }
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
//****************************************************************************
上面的是实现方法,下面是使用:
 DropDown1 *dd1 = [[DropDown1 alloc] initWithFrame:CGRectMake(10, 10, 140, 100)];
 dd1.textField.placeholder = @"请输入联系方式";
 NSArray* arr=[[NSArray alloc]initWithObjects:@"电话",@"email",@"手机",@"aaa",@"bbb",@"ccc",nil];
 dd1.tableArray = arr;
 [arr release];
 [self.view addSubview:dd1];
 [dd1 release];

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