【IOS功能實現】之：下拉列表
通過網上資料，自己藉助資料寫的程式碼，這是完全程式碼
//****************************************************************************
@interface DropDown1 : UIView <UITableViewDelegate,UITableViewDataSource> {
UITableView *tv;//下拉列表
NSArray *tableArray;//下拉列表資料
UITextField *textField;//文字輸入框
BOOL showList;//
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];
[tableArrayrelease];
[textFieldrelease];
[super dealloc];
}
-(id)initWithFrame:(CGRect)frame
{
if (frame.size.height<200) {
frameHeight = 200;
}else{
frameHeight
}
tabheight = frameHeight-30;
frame.size.height = 30.0f;
self=[super initWithFrame:frame];
if(self){
showList = NO; //預設不顯示下拉框
tv = [[UITableView alloc] initWithFrame:CGRectMake(0, 30, frame.size.width, 0)];
tv.delegate = self;
tv.dataSource = self;
tv.backgroundColor = [UIColorgrayColor];
tv.separatorColor = [UIColorlightGrayColor];
tv.hidden = YES;
[self addSubview:tv];
textField = [[UITextField alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, 30)];
textField.borderStyle=UITextBorderStyleRoundedRect;//設定文字框的邊框風格
[textFieldaddTarget:selfaction:@selector(dropdown) forControlEvents:UIControlEventAllTouchEvents];
[self addSubview:textField];
}
returnself;
}
-(void)dropdown{
[textFieldresignFirstResponder];
if (showList) {//如果下拉框已顯示，什麼都不做
return;
}else {//如果下拉框尚未顯示，則進行顯示
CGRect sf = self.frame;
sf.size.height = frameHeight;
//把dropdownList放到前面，防止下拉框被別的控制元件遮住
[self.superviewbringSubviewToFront:self];
tv.hidden = NO;
showList = YES;//顯示下拉框
CGRect frame = tv.frame;
frame.size.height = 0;
tv.frame = frame;
frame.size.height = tabheight;
[UIViewbeginAnimations:@"ResizeForKeyBoard"context:nil];
[UIViewsetAnimationCurve:UIViewAnimationCurveLinear];
self.frame = sf;
tv.frame = frame;
[UIViewcommitAnimations];
}
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [tableArraycount];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCellalloc] initWithStyle:UITableViewCellStyleDefaultreuseIdentifier:CellIdentifier] autorelease];
}
cell.textLabel.text = [tableArray objectAtIndex:[indexPath row]];
cell.textLabel.font = [UIFontsystemFontOfSize: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
//****************************************************************************
上面的是實現方法，下面是使用：
DropDown1 *dd1 = [[DropDown1alloc] initWithFrame:CGRectMake(10, 10, 140, 100)];
dd1.textField.placeholder = @"請輸入聯絡方式";
NSArray* arr=[[NSArrayalloc]initWithObjects:@"電話",@"email",@"手機",@"aaa",@"bbb",@"ccc",nil];
dd1.tableArray = arr;
[arr release];
[self.view addSubview:dd1];
[dd1 release];