ios 设置文本后通过自动布局获取 UITextView 动态高度
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Get UITextView dynamic height with auto layout after setting text
提问by Piero
I have a UITextView not scrollable with auto layout set by interface builder, and the text increase or decrease dynamically with no problem, but i want know what is the new UITextView height after setting text, i'm trying to do this:
我有一个 UITextView 不能通过界面构建器设置的自动布局滚动，并且文本动态增加或减少没有问题，但我想知道设置文本后新的 UITextView 高度是多少，我正在尝试这样做：
NSLog(@"text before: %.2f",self.myText.frame.size.height);
[self.myText setText:self.string];
NSLog(@"text after: %.2f",self.myText.frame.size.height);
this is the result:
这是结果：
text before: 47.50
text after: 47.50
the text is increased in the view when i run it, but the size is the same, how i can get the real height after setting text?
运行时文本在视图中增加，但大小相同，设置文本后如何获得实际高度？
采纳答案by Guillaume Algis
This should work:
这应该有效：
NSLog(@"text before: %.2f",self.myText.frame.size.height);
[self.myText setText:self.string];
[self.myText layoutIfNeeded]; // <--- Add this
NSLog(@"text after: %.2f",self.myText.frame.size.height);
Here's an example implementation on my Github: https://github.com/guillaume-algis/SO-27060338
这是我的 Github 上的示例实现：https: //github.com/guillaume-algis/SO-27060338
回答by Pavel Gurov
All you have to do is:
您所要做的就是：
- set up all your constraints except the height oneAND
- set
textView'sscrollEnabledproperty toNO
- 设置除高度一之外的所有约束和
- 将
textView的scrollEnabled属性设置为NO
The last part is what does the trick.
最后一部分是诀窍。
Your text view will size automatically depending on its text value.
您的文本视图将根据其文本值自动调整大小。
回答by Michael Revlis
If you prefer to do it all by auto layout:
如果您更喜欢通过自动布局来完成这一切：
In Size Inspector:
在尺寸检查器中：
Set Content Compression Resistance Priority Verticalto 1000.
Lower the priority of constraint height for your UITextView. Just make it less than 1000.
将Content Compression Resistance Priority Vertical 设置为 1000。
降低 UITextView 的约束高度的优先级。让它小于1000。
In Attributes Inspector:
在属性检查器中：
- Uncheck Scrolling Enabled.
- 取消选中滚动已启用。
回答by Parul Garg
I have used the code given on following link AutoLayout with Dynamic UITextView heightand it worked for me :)
我使用了以下链接AutoLayout 和动态 UITextView 高度上给出的代码，它对我有用:)
回答by Marco Martignone
Swift 3.0
斯威夫特 3.0
textView.isScrollEnabled = false
This allow AutoLayout to do its job.
这允许 AutoLayout 完成它的工作。
回答by Alok
Use below code:
使用以下代码：
Objective-C Code
Objective-C 代码
[textView setScrollEnabled:NO];
Swift Code
SWIFT代码
textView.isScrollEnabled = false
回答by merocode
Just after changing the text call
更改文字电话后
[self.myText sizeToFit];
回答by Hlung
Unlike UILabel, UITextView's has no intrinsic size property. So how I did it was set up the UITextView's height constraint, hook it via IBOutlet, and change its value in textViewDidChangeor when text changes.
与 UILabel 不同，UITextView 没有固有的大小属性。因此，我是如何设置UITextView的高度约束的，通过 IBOutlet 将其挂钩，并textViewDidChange在文本更改时或更改其值时更改它的值。
@IBOutlet weak var textViewHeight: NSLayoutConstraint!
func textViewDidChange(textView: UITextView) {
// dynamic height adjustments
var height = ceil(textView.contentSize.height) // ceil to avoid decimal
if height != textViewHeight.constant { // set when height changed
textViewHeight.constant = height
textView.setContentOffset(CGPointZero, animated: false) // scroll to top to avoid "wrong contentOffset" artefact when line count changes
}
}
回答by Hardik Kardani
- (void)textViewDidChange:(UITextView *)textView
{
UIFont *myFont = [UIFont systemFontOfSize:14];
CGSize size = [self sizeOfText:textView.text widthOfTextView:TextviewWidth withFont:myFont];
NSLog(@"Height : %f", size.height);
}
-(CGSize)sizeOfText:(NSString *)textToMesure widthOfTextView:(CGFloat)width withFont:(UIFont*)font
{
CGSize ts = [textToMesure sizeWithFont:font constrainedToSize:CGSizeMake(width-20.0, FLT_MAX) lineBreakMode:NSLineBreakByWordWrapping];
return ts;
}
回答by Zain Ullah Muhammad
select textview and uncheck "Scrolling enabled"
选择 textview 并取消选中“启用滚动”
select textview from top menu "Editor > size to fit content"
从顶部菜单“编辑器 > 适合内容的大小”中选择 textview
select the view below it, set its top constraintswith the textview bottomto whatever margin you want, then go to "Size Inspector",double click or edit the constraint you just added, and set the "Relation" to "Greater than or Equal"
选择它下面的视图，将其顶部约束与textview 底部设置为您想要的任何边距，然后转到“大小检查器”，双击或编辑您刚刚添加的约束，并将“关系”设置为“大于或等于”
