iphone - 使用文本以编程方式更改 UITextView 高度

Question

我想用我设置的文本量以编程方式更改 UITextView，我有一个问题，如果我用界面生成器添加 UITextView 并且我这样做：

CGRect frame = textViewA1.frame;
frame.size.height = textViewA1.contentSize.height;
textViewA1.frame = frame;

一切正常，但如果我以编程方式创建 UITextView，高度不会改变，我这样做：

 UITextView *textViewA1 = [[UITextView alloc] initWithFrame:CGRectMake(5, 5, 320, 50)];
[textViewA1 setFont:[UIFont fontWithName:@"Enriqueta" size:15]];
[textViewA1 setScrollEnabled:NO];
[textViewA1 setUserInteractionEnabled:NO];
[textViewA1 setBackgroundColor:[UIColor clearColor]];
[textViewA1 setText:@"A lot of text"];
CGRect frame = textViewA1.frame;
frame.size.height = textViewA1.contentSize.height;
textViewA1.frame = frame;

这样uitextview的高度大小不会改变，我该怎么办？

Answer 1

只需将sizeToFit消息发送到UITextView. 它将调整自己的高度以适合其文本。它不会改变自己的宽度或原点。

[textViewA1 sizeToFit];

Answer 2

我认为你需要做：

CGRect frame = textViewA1.frame;
frame.size.height = textViewA1.contentSize.height;
textViewA1.frame = frame;

在添加子视图之后：

[self.view addSubview: self.textView];

Answer 3

您需要计算您拥有的文本的帧大小，例如：

UIFont *font = [UIFont fontWithName:@"Enriqueta" size:15];
NSString *text = @"A lot of text";
CGSize frameSize = [text sizeWithFont:font];
CGRect originalFrame = textViewA1.frame;
textViewA1.frame = CGRectMake(CGRectGetMinX(originalFrame), CGRectGetMinY(originalFrame), frameSize.width, frameSize.height);

为防止其超过特定高度，请使用：

CGFloat maxHeight = 100; // or something
CGSize frameSize = [text sizeWithFont:font constrainedToSize:maxHeight];

Answer 4

试试这个代码

UIFont * font = [UIFont fontWithName:@"Enriqueta" size:15];
textViewA1.font = font;
NSString * theText = @"A lot of text";
CGSize theStringSize = [theText sizeWithFont:font constrainedToSize:CGSizeMake(190, 1000000) lineBreakMode:UILineBreakModeWordWrap];
CGRect frame = textViewA1.frame;
frame.size.height = theStringSize.height;
textViewA1.frame = frame;

对于 textview，这当然具有 190 像素的静态宽度。你显然可以改变它！

Answer 5

UITextView在 textview 中添加多行时滚动

- (BOOL)textViewShouldBeginEditing:(UITextView *)textView
{
    CGRect frameTextView = textView.frame;
    frameTextView.height -= KEY_BOARD_HEIGHT;
    textView.frame = frameTextView;
}
- (BOOL)textViewShouldEndEditing:(UITextView *)textView;
{
    CGRect frameTextView = textView.frame;
    frameTextView.height += KEY_BOARD_HEIGHT;
    textView.frame = frameTextView;
}