天天看點

ios學習--iphone 實作下拉菜單

http://blog.163.com/[email protected]/blog/static/8905310920116224445195/

通過網上資料,自己借助資料寫的代碼,這是完全代碼

//****************************************************************************

@interface DropDown1 : UIView <UITableViewDelegate,UITableViewDataSource> {

    UITableView *tv;//下拉清單

    NSArray *tableArray;//下拉清單資料

    UITextField *textField;//文本輸入框

    BOOL showList;//是否彈出下拉清單

    CGFloat tabheight;//table下拉清單的高度

    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; //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 = [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;//設定文本框的邊框風格

        [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,防止下拉框被别的控件遮住

        [self.superview bringSubviewToFront: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;

        [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

//****************************************************************************

上面的是實作方法,下面是使用:

 DropDown1 *dd1 = [[DropDown1 alloc] initWithFrame:CGRectMake(10, 10, 140, 100)];

 dd1.textField.placeholder = @"請輸入聯系方式";

 NSArray* arr=[[NSArray alloc]initWithObjects:@"電話",@"email",@"手機",@"aaa",@"bbb",@"ccc",nil];

 dd1.tableArray = arr;

 [arr release];

 [self.view addSubview:dd1];

 [dd1 release];