iphone - 如何通过单击按钮使textView可展开

Question

我在 scrollView 之上有许多 textView，并且每个 textView 上面都有一个自定义按钮，以便当用户单击该 >textView 它应该展开，当它单击返回时，它应该折叠到之前的位置。

我想做的是隐藏smallTextView并在按下按钮时显示expandedTextView，当按下按钮时我想隐藏expandedtextView n 显示smallTextView。但我不知道该怎么做。任何帮助将不胜感激。

这是我的代码:

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.

    self.title = @"Demo";
    appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    for (int i=0;i<[appDelegate.serverResponseArray count];i++)
    {
    self.expandTextView = [[UITextView alloc] init];
    [self.expandTextView setFrame:CGRectMake(8.0f, i*50.0f+10.0f, 270.0f, 40.0f)];
    [self.expandTextView setBackgroundColor:[UIColor grayColor]];
    [self.expandTextView setFont:[UIFont fontWithName:@"helvetica" size:12]];
    [self.expandTextView setText:@"Welcome!!!"];
    [self.expandTextView setTextColor:[UIColor colorWithRed:255.0f/255.0f green:255.0f/255.0f blue:255.0f/255.0f alpha:1]];
    [self.expandTextView setUserInteractionEnabled:NO];
    [self.scrollView addSubview:self.expandTextView];
    self.expandTextView = nil;

    self.expandButton = [[UIButton alloc]initWithFrame:CGRectMake(8.0f, i*50.0f+1.0f, 270.0f, 60.0f)];
    [self.expandButton setBackgroundColor:[UIColor clearColor]];
    [self.expandButton addTarget:self action:@selector(textButtonClicked:) forControlEvents:UIControlEventTouchDragInside];
    [self.scrollView addSubview:self.expandButton];

    UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(278.0f, i*50.0f+10.0f, 14.0f, 40.0f)];
    [imageView setBackgroundColor:[UIColor grayColor]];
    [imageView setImage:[UIImage imageNamed:@"arrow.png"]];
    [self.scrollView addSubview:imageView];
    imageView = nil;

}


float maxHeight = 0;

    for(UIView *v in [self.scrollView subviews])
    {
        if(v.frame.origin.x + v.frame.size.height > maxHeight)
            maxHeight = v.frame.origin.x + v.frame.size.height;
    }

    self.scrollView.contentSize = CGSizeMake(_scrollView.frame.size.width, maxHeight+2570);

}
-(void)textButtonClicked:(id)sender
{
    NSLog(@"Hi");
    [self.expandTextView setHidden:YES\]; 
    NSLog(@"hey");
}

我如何知道哪个按钮被按下。

Answer 1

你做错了。您的方法应如下所示:

-(IBAction)textButtonClicked:(id)sender
{
    NSLog(@"Hi");
    [self.expandTextView setHidden:YES]; 
    NSLog(@"hey");
}

在 ViewContrller 中编写此方法后，将 Expand Button 的 -touchUpInside 方法连接到 -textButtonClicked 方法。使用这一行:

[self.expandButton addTarget:self action:@selector(textButtonClicked:) forControlEvents:UIControlEventTouchUpInside];

而不是代码中的那个。