我的UITextView
添加了UIView
。添加的textview不可编辑,只是显示一些数据。 textview中显示的数据是动态的。那是线数不固定。它可能会有所不同因此,如果行数增加,则还需要增加textview的大小。我不知道如何做到这一点。请给我一些想法。
更新
这就是我正在做的事情:
UIView *baseView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 300, 200)];
baseView.backgroundColor = [UIColor grayColor];
[window addSubview:baseView];
UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(5, 30, 100, 30)];
textView.autoresizingMask = UIViewAutoresizingFlexibleHeight;
textView.text = @"asdf askjalskjalksjlakjslkasj";
[textView sizeToFit];
[baseView addSubview:textView];
答案 0 :(得分:58)
在How do I size a UITextView to its content?
上发布了答案CGRect frame = _textView.frame;
frame.size.height = _textView.contentSize.height;
_textView.frame = frame;
或更好(考虑到内容感谢kpower的评论)
CGRect frame = _textView.frame;
UIEdgeInsets inset = textView.contentInset;
frame.size.height = _textView.contentSize.height + inset.top + inset.bottom;
_textView.frame = frame;
注意:如果要多次引用对象的属性(例如frame或contentInset),最好将其分配给局部变量,这样就不会触发额外的方法调用(_textView.frame / [_ textView frame是方法调用)。如果你经常调用这段代码(100000次),那么这将会明显变慢(十几个方法调用是无关紧要的)。
然而......如果你想在没有额外变量的一行中这样做,那就是
_textView.frame = CGRectMake(_textView.frame.origin.x, _textView.frame.origin.y, _textView.frame.size.width, _textView.contentSize.height + _textView.contentInset.top + _textView.contentInset.bottom);
以5个额外的方法调用为代价。
答案 1 :(得分:29)
您可以使用setFrame:
或sizeToFit
。
<强>更新强>
我将sizeToFit
与UILabel
一起使用,它运行正常,但UITextView
是UIScrollView
的子类,所以我可以理解为什么sizeToFit
没有不会产生预期的结果。
您仍然可以计算文字高度并使用setFrame
,但如果文字太长,您可能希望利用UITextView
的滚动条。
以下是获得文字高度的方法:
#define MAX_HEIGHT 2000
NSString *foo = @"Lorem ipsum dolor sit amet.";
CGSize size = [foo sizeWithFont:[UIFont systemFontOfSize:14]
constrainedToSize:CGSizeMake(100, MAX_HEIGHT)
lineBreakMode:UILineBreakModeWordWrap];
然后您可以将其与UITextView
:
[textView setFont:[UIFont systemFontOfSize:14]];
[textView setFrame:CGRectMake(5, 30, 100, size.height + 10)];
或者您可以先进行高度计算并避开setFrame
行:
UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(5, 30, 100, size.height + 10)];
答案 2 :(得分:2)
textView.contentSize.height
中的 textViewDidChange
只能在文本实际增长后调整大小。为了获得最佳视觉效果,请事先调整大小。几个小时之后,我已经想出如何使它与Instagram完全一样(它在所有BTW中具有最佳算法)
初始化:
// Input
_inputBackgroundView = [[UIImageView alloc] initWithFrame:CGRectMake(0.0f, size.height - _InputBarHeight, size.width, _InputBarHeight)];
_inputBackgroundView.autoresizingMask = UIViewAutoresizingNone;
_inputBackgroundView.contentMode = UIViewContentModeScaleToFill;
_inputBackgroundView.userInteractionEnabled = YES;
[self addSubview:_inputBackgroundView];
[_inputBackgroundView release];
[_inputBackgroundView setImage:[[UIImage imageNamed:@"Footer_BG.png"] stretchableImageWithLeftCapWidth:80 topCapHeight:25]];
// Text field
_textField = [[UITextView alloc] initWithFrame:CGRectMake(70.0f, 0, 185, 0)];
_textField.backgroundColor = [UIColor clearColor];
_textField.delegate = self;
_textField.contentInset = UIEdgeInsetsMake(-4, -2, -4, 0);
_textField.showsVerticalScrollIndicator = NO;
_textField.showsHorizontalScrollIndicator = NO;
_textField.font = [UIFont systemFontOfSize:15.0f];
[_inputBackgroundView addSubview:_textField];
[_textField release];
[self adjustTextInputHeightForText:@""];
填写UITextView委托方法:
- (void) textViewDidBeginEditing:(UITextView*)textView {
[self adjustTextInputHeightForText:_textField.text];
}
- (void) textViewDidEndEditing:(UITextView*)textView {
[self adjustTextInputHeightForText:_textField.text];
}
- (BOOL) textView:(UITextView*)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString*)text {
if ([text isEqualToString:@"\n"])
{
[self performSelector:@selector(inputComplete:) withObject:nil afterDelay:.1];
return NO;
}
else if (text.length > 0)
{
[self adjustTextInputHeightForText:[NSString stringWithFormat:@"%@%@", _textField.text, text]];
}
return YES;
}
- (void) textViewDidChange:(UITextView*)textView {
[self adjustTextInputHeightForText:_textField.text];
}
诀窍是......
- (void) adjustTextInputHeightForText:(NSString*)text {
int h1 = [text sizeWithFont:_textField.font].height;
int h2 = [text sizeWithFont:_textField.font constrainedToSize:CGSizeMake(_textField.frame.size.width - 16, 170.0f) lineBreakMode:UILineBreakModeWordWrap].height;
[UIView animateWithDuration:.1f animations:^
{
if (h2 == h1)
{
_inputBackgroundView.frame = CGRectMake(0.0f, self.frame.size.height - _InputBarHeight, self.frame.size.width, _InputBarHeight);
}
else
{
CGSize size = CGSizeMake(_textField.frame.size.width, h2 + 24);
_inputBackgroundView.frame = CGRectMake(0.0f, self.frame.size.height - size.height, self.frame.size.width, size.height);
}
CGRect r = _textField.frame;
r.origin.y = 12;
r.size.height = _inputBackgroundView.frame.size.height - 18;
_textField.frame = r;
} completion:^(BOOL finished)
{
//
}];
}
答案 3 :(得分:2)
如果在第一次调整大小时设置文本后调用sizeToFit。因此,在第一次设置后,后续调用set text将导致大小没有变化。即使你调用sizeToFit。
但是,您可以强制它像这样调整大小:
答案 4 :(得分:1)
这对我很有用:
#define MAX_HEIGHT 2000
CGSize size = [text sizeWithFont:[UIFont systemFontOfSize:14]
constrainedToSize:CGSizeMake(100, MAX_HEIGHT)
lineBreakMode:UILineBreakModeWordWrap];
[textview setFont:[UIFont systemFontOfSize:14]];
[textview setFrame:CGRectMake(45, 6, 100, size.height + 10)];
textview.text = text;
答案 5 :(得分:0)
执行以下操作:
_textView.text = someText;
[_textView sizeToFit];
_textView.frame.height = _textView.contentSize.height;
答案 6 :(得分:0)
解决类似的问题我刚刚创建了一个基于自动布局的轻量级UITextView子类,它根据用户输入的大小自动增长和缩小,并且可以通过最大和最小高度进行约束 - 所有这些都没有一行代码
答案 7 :(得分:0)
@Gabe给出的答案似乎在iOS7.1中不起作用,直到viewDidAppear之后。请参阅下面的测试。
更新:实际上,情况更复杂。如果在resizeTheTextView方法中指定textView.text,则在iOS7中,调整大小相当于只允许一行文本。真的很奇怪。
更新2:另见UITextView content size different in iOS7
更新3:请查看我最近使用的代码,了解我现在使用的内容。似乎可以完成这项工作。
#import "ViewController.h"
@interface ViewController ()
{
UITextView *textView;
}
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
textView = [[UITextView alloc] initWithFrame:CGRectMake(50, 50, 200, 1)];
[self.view addSubview:textView];
CALayer *layer = textView.layer;
layer.borderColor = [UIColor blackColor].CGColor;
layer.borderWidth = 1;
textView.text = @"hello world\n\n";
// Calling the method directly, after the view is rendered, i.e., after viewDidAppear, works on both iOS6.1 and iOS7.1
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setTitle:@"Change size" forState:UIControlStateNormal];
[button addTarget:self action:@selector(resizeTheTextView) forControlEvents:UIControlEventTouchUpInside];
[button sizeToFit];
CGRect frame = button.frame;
frame.origin.y = 400;
button.frame = frame;
[self.view addSubview:button];
// Works on iOS6.1, but does not work on iOS7.1
//[self resizeTheTextView];
}
- (void) viewWillAppear:(BOOL)animated
{
// Does not work on iOS7.1, but does work on iOS6.1
//[self resizeTheTextView];
}
- (void) viewDidAppear:(BOOL)animated
{
// Does work on iOS6.1 and iOS7.1
//[self resizeTheTextView];
}
- (void) resizeTheTextView
{
NSLog(@"textView.frame.size.height: %f", textView.frame.size.height);
NSLog(@"textView.contentSize.height: %f", textView.contentSize.height);
// 5) From https://stackoverflow.com/questions/728704/resizing-uitextview
CGRect frame = textView.frame;
UIEdgeInsets inset = textView.contentInset;
frame.size.height = textView.contentSize.height + inset.top + inset.bottom;
textView.frame = frame;
NSLog(@"inset.top: %f, inset.bottom: %f", inset.top, inset.bottom);
NSLog(@"textView.frame.size.height: %f", textView.frame.size.height);
NSLog(@"textView.contentSize.height: %f", textView.contentSize.height);
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
UPDATE3:
if ([[UIDevice currentDevice] majorVersionNumber] < 7.0) {
CGRect frame = _abstractTextView.frame;
UIEdgeInsets inset = _abstractTextView.contentInset;
frame.size.height = _abstractTextView.contentSize.height + inset.top + inset.bottom;
_abstractTextView.frame = frame;
}
else {
CGSize textViewSize = [_abstractTextView sizeThatFits:CGSizeMake(_abstractTextView.frame.size.width, FLT_MAX)];
_abstractTextView.frameHeight = textViewSize.height;
}
答案 8 :(得分:0)
如果您在其上设置内容模式,则将UITextView添加到其父级后,它似乎会自动调整其大小。
这意味着您不需要手动计算高度并应用高度限制。它似乎工作!!在iPad上测试iOS7和iOS8。
e.g。
--
textView.contentMode = UIViewContentMode.Center;
--
如果有人能够解释为什么这样可行,那将非常感激..我在界面构建器中弄乱选项时偶然发现了它。
答案 9 :(得分:0)
只需将scrollEnabled
设置为NO
,或取消选中IB中滚动视图部分中的滚动已启用,UITextView
将自行调整大小。