根据文本行动态调整标签大小

Question

I am finding it surprisingly hard to resize a label containing newlines based on the quantity of lines and text. It displays fine in a large enough textview. However, I'd like the economy of sizing the label--or I'd be happy with resizing a textview--exactly.

This is the code I am using from an answer on SO but it is having no effect on the size of the label. Would appreciate any suggestions on how to make this work:

NSString *list = self.list.list;
// use font information from the UILabel to calculate the size    
UITextView *view=[[UITextView alloc] initWithFrame:CGRectMake(0, 0, 280, 10)]; 
//make random size view
view.text=list;
CGSize size=[view sizeThatFits:CGSizeMake(280, CGFLOAT_MAX)];
// create a frame that is filled with the UILabel frame data
CGRect newFrame = _listLabel.frame;
// resizing the frame to calculated size
newFrame.size.height = size.height;
// put calculated frame into UILabel frame
_listLabel.frame = newFrame;

Answer 1

Why are you setting the frame of your label with reference of a newly created UITextView, it will create a useless object in your memory, to set the label frame according to your text just use this 2 line of code

lbl.numberOfLines=0;
[lbl sizeToFit];

It will make the label as large as your text.

Answer 2

You really should use autolayout. Just constrain the label where you need and let UIKit do it's job.

Here an example:

I set a top space and a leading margin constraints

Then I added a width constraint and then I added some more text

As you can see the label resized itself as it knows how much text it has inside and how much space it occupies.