blocks|key|129664|text|要创建具有高度和宽度约束的标签，这里是constraints...And，不要忘了使用addSubview方法在视图中添加标签|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|129665|UILabel+*Label+=+[[UILabel+alloc]+init];
[Label+setTranslatesAutoresizingMaskIntoConstraints:NO];++

[self.view+addSubview:Label];

//+Width+constraint
[Label+addConstraint:[NSLayoutConstraint+constraintWithItem:Label
++++++++++++++++++++++++++++++++++++++++++++++++++++++attribute:NSLayoutAttributeWidth
++++++++++++++++++++++++++++++++++++++++++++++++++++++relatedBy:NSLayoutRelationEqual
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++toItem:nil
++++++++++++++++++++++++++++++++++++++++++++++++++++++attribute:+NSLayoutAttributeNotAnAttribute
+++++++++++++++++++++++++++++++++++++++++++++++++++++multiplier:1
+++++++++++++++++++++++++++++++++++++++++++++++++++++++constant:200]];

//+Height+constraint
[Label+addConstraint:[NSLayoutConstraint+constraintWithItem:Label
++++++++++++++++++++++++++++++++++++++++++++++++++++++attribute:NSLayoutAttributeHeight
++++++++++++++++++++++++++++++++++++++++++++++++++++++relatedBy:NSLayoutRelationEqual
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++toItem:nil
++++++++++++++++++++++++++++++++++++++++++++++++++++++attribute:+NSLayoutAttributeNotAnAttribute
+++++++++++++++++++++++++++++++++++++++++++++++++++++multiplier:1
+++++++++++++++++++++++++++++++++++++++++++++++++++++++constant:21]];|code-block|syntax|javascript|129666|Swift+4：|129667|label.translatesAutoresizingMaskIntoConstraints+=+false
label.addConstraint(NSLayoutConstraint(item:+label,+attribute:+.height,+relatedBy:+.equal,+toItem:+nil,+attribute:+.notAnAttribute,+multiplier:+1,+constant:+21))
label.addConstraint(NSLayoutConstraint(item:+label,+attribute:+.width,+relatedBy:+.equal,+toItem:+nil,+attribute:+.notAnAttribute,+multiplier:+1,+constant:+200))|129668|在Swift中|129669|+Label.setTranslatesAutoresizingMaskIntoConstraints(false)
+self.view.addSubview(Label)

+Label.addConstraint(NSLayoutConstraint(item:+Label,+attribute:+.Height,+relatedBy:+.Equal,+toItem:+nil,+attribute:+.NotAnAttribute,+multiplier:+1,+constant:+21))
+Label.addConstraint(NSLayoutConstraint(item:+Label,+attribute:+.Width,+relatedBy:+.Equal,+toItem:+nil,+attribute:+.NotAnAttribute,+multiplier:+1,+constant:+200))++|129670|检查此link以了解更多详细信息|129671|更新|BOLD|129672|当你更新你的问题时，这是我更新后的答案...|129673|UILabel+*Label1+=+[[UILabel+alloc]+init];
[Label1+setTranslatesAutoresizingMaskIntoConstraints:NO];
UILabel+*Label2+=+[[UILabel+alloc]+init];
[Label2+setTranslatesAutoresizingMaskIntoConstraints:NO];

Label1.text+=+@"Label1";
Label1.backgroundColor+=+[UIColor+blueColor];
Label2.text+=+@"Label2";
Label2.backgroundColor+=+[UIColor+redColor];

[self.view+addSubview:Label1];
[self.view+addSubview:Label2];

//+Width+constraint
[Label1+addConstraint:[NSLayoutConstraint+constraintWithItem:Label1
++++++++++++++++++++++++++++++++++++++++++++++++++attribute:NSLayoutAttributeWidth
++++++++++++++++++++++++++++++++++++++++++++++++++relatedBy:NSLayoutRelationEqual
+++++++++++++++++++++++++++++++++++++++++++++++++++++toItem:nil
++++++++++++++++++++++++++++++++++++++++++++++++++attribute:+NSLayoutAttributeNotAnAttribute
+++++++++++++++++++++++++++++++++++++++++++++++++multiplier:1
+++++++++++++++++++++++++++++++++++++++++++++++++++constant:280]];

//+Height+constraint
[Label1+addConstraint:[NSLayoutConstraint+constraintWithItem:Label1
++++++++++++++++++++++++++++++++++++++++++++++++++attribute:NSLayoutAttributeHeight
++++++++++++++++++++++++++++++++++++++++++++++++++relatedBy:NSLayoutRelationEqual
+++++++++++++++++++++++++++++++++++++++++++++++++++++toItem:nil
++++++++++++++++++++++++++++++++++++++++++++++++++attribute:+NSLayoutAttributeNotAnAttribute
+++++++++++++++++++++++++++++++++++++++++++++++++multiplier:1
+++++++++++++++++++++++++++++++++++++++++++++++++++constant:21]];

//+CenterX+constraint
[self.view+addConstraint:[NSLayoutConstraint+constraintWithItem:self.view
+++++++++++++++++++++++++++++++++++++++++++++++++++attribute:NSLayoutAttributeCenterX
+++++++++++++++++++++++++++++++++++++++++++++++++++relatedBy:NSLayoutRelationEqual
++++++++++++++++++++++++++++++++++++++++++++++++++++++toItem:Label1
+++++++++++++++++++++++++++++++++++++++++++++++++++attribute:+NSLayoutAttributeCenterX
++++++++++++++++++++++++++++++++++++++++++++++++++multiplier:1
++++++++++++++++++++++++++++++++++++++++++++++++++++constant:0]];
//+Top+constraint
[self.view+addConstraint:[NSLayoutConstraint+constraintWithItem:Label1
++++++++++++++++++++++++++++++++++++++++++++++++++++++attribute:NSLayoutAttributeTop
++++++++++++++++++++++++++++++++++++++++++++++++++++++relatedBy:NSLayoutRelationEqual
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++toItem:self.topLayoutGuide
++++++++++++++++++++++++++++++++++++++++++++++++++++++attribute:+NSLayoutAttributeBottom
+++++++++++++++++++++++++++++++++++++++++++++++++++++multiplier:1
+++++++++++++++++++++++++++++++++++++++++++++++++++++++constant:40]];


//+label2
[self.view+addConstraint:[NSLayoutConstraint+constraintWithItem:Label1
++++++++++++++++++++++++++++++++++++++++++++++++++++++attribute:NSLayoutAttributeLeading
++++++++++++++++++++++++++++++++++++++++++++++++++++++relatedBy:NSLayoutRelationEqual
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++toItem:Label2
++++++++++++++++++++++++++++++++++++++++++++++++++++++attribute:+NSLayoutAttributeLeading
+++++++++++++++++++++++++++++++++++++++++++++++++++++multiplier:1
+++++++++++++++++++++++++++++++++++++++++++++++++++++++constant:0]];
//+label2.Height+=+label1.Height
[self.view++addConstraint:[NSLayoutConstraint+constraintWithItem:Label1
++++++++++++++++++++++++++++++++++++++++++++++++++++++attribute:NSLayoutAttributeHeight
++++++++++++++++++++++++++++++++++++++++++++++++++++++relatedBy:NSLayoutRelationEqual
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++toItem:Label2
++++++++++++++++++++++++++++++++++++++++++++++++++++++attribute:+NSLayoutAttributeHeight
+++++++++++++++++++++++++++++++++++++++++++++++++++++multiplier:1
+++++++++++++++++++++++++++++++++++++++++++++++++++++++constant:0]];
//+label2.width+=+label1.width
[self.view++addConstraint:[NSLayoutConstraint+constraintWithItem:Label1
+++++++++++++++++++++++++++++++++++++++++++++++++++attribute:NSLayoutAttributeWidth
+++++++++++++++++++++++++++++++++++++++++++++++++++relatedBy:NSLayoutRelationEqual
++++++++++++++++++++++++++++++++++++++++++++++++++++++toItem:Label2
+++++++++++++++++++++++++++++++++++++++++++++++++++attribute:+NSLayoutAttributeWidth
++++++++++++++++++++++++++++++++++++++++++++++++++multiplier:1
++++++++++++++++++++++++++++++++++++++++++++++++++++constant:0]];

//+label2.Top
[self.view+addConstraint:[NSLayoutConstraint+constraintWithItem:Label2
++++++++++++++++++++++++++++++++++++++++++++++++++++++attribute:NSLayoutAttributeTop
++++++++++++++++++++++++++++++++++++++++++++++++++++++relatedBy:NSLayoutRelationEqual
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++toItem:Label1
++++++++++++++++++++++++++++++++++++++++++++++++++++++attribute:+NSLayoutAttributeBottom
+++++++++++++++++++++++++++++++++++++++++++++++++++++multiplier:1
+++++++++++++++++++++++++++++++++++++++++++++++++++++++constant:34]];++|129674|结果屏幕|129675|​|129676|📷|atomic|129677|129678|entityMap|0|LINK|mutability|MUTABLE|url|https://happyteamlabs.com/blog/ios-fixed-height-width-constraint-autolayout/|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/5ad0e5327e2a97b91109da81994a7a23.png|imageAlt^0|17|A|0|0|0|0|0|0|3|4|0|0|0|2|0|0|0|0|4|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|1N|8|@$9|1O|A|1P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|1Q|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1R|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|1S|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|1T|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|1U|8|@]|D|@]|E|$I|J]]|$1|S|3|T|5|6|7|1V|8|@]|D|@$9|1W|A|1X|1|1Y]]|E|$]]|$1|U|3|V|5|6|7|1Z|8|@$9|20|A|21|B|W]]|D|@]|E|$]]|$1|X|3|Y|5|6|7|22|8|@]|D|@]|E|$]]|$1|Z|3|10|5|H|7|23|8|@]|D|@]|E|$I|J]]|$1|11|3|12|5|6|7|24|8|@$9|25|A|26|B|W]]|D|@]|E|$]]|$1|13|3|14|5|6|7|27|8|@]|D|@]|E|$]]|$1|15|3|16|5|17|7|28|8|@]|D|@$9|29|A|2A|1|2B]]|E|$]]|$1|18|3|14|5|6|7|2C|8|@]|D|@]|E|$]]|$1|19|3|-4|5|6|7|2D|8|@]|D|@]|E|$]]]|1A|$1B|$5|1C|1D|1E|E|$1F|1G]]|1H|$5|1I|1D|1J|E|$1K|1L|1M|-4]]]]

To create label with height and width constraints here is the constraints...And don't forget to add label in to view with <code>addSubview</code> method

<pre><code>UILabel *Label = [[UILabel alloc] init];
[Label setTranslatesAutoresizingMaskIntoConstraints:NO]; 

[self.view addSubview:Label];

// Width constraint
[Label addConstraint:[NSLayoutConstraint constraintWithItem:Label
 attribute:NSLayoutAttributeWidth
 relatedBy:NSLayoutRelationEqual
 toItem:nil
 attribute: NSLayoutAttributeNotAnAttribute
 multiplier:1
 constant:200]];

// Height constraint
[Label addConstraint:[NSLayoutConstraint constraintWithItem:Label
 attribute:NSLayoutAttributeHeight
 relatedBy:NSLayoutRelationEqual
 toItem:nil
 attribute: NSLayoutAttributeNotAnAttribute
 multiplier:1
 constant:21]];
</code></pre>

<h1>Swift 4:</h1>

<pre><code>label.translatesAutoresizingMaskIntoConstraints = false
label.addConstraint(NSLayoutConstraint(item: label, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: 21))
label.addConstraint(NSLayoutConstraint(item: label, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: 200))
</code></pre>

And In Swift

<pre><code> Label.setTranslatesAutoresizingMaskIntoConstraints(false)
 self.view.addSubview(Label)

 Label.addConstraint(NSLayoutConstraint(item: Label, attribute: .Height, relatedBy: .Equal, toItem: nil, attribute: .NotAnAttribute, multiplier: 1, constant: 21))
 Label.addConstraint(NSLayoutConstraint(item: Label, attribute: .Width, relatedBy: .Equal, toItem: nil, attribute: .NotAnAttribute, multiplier: 1, constant: 200)) 
</code></pre>

Check this <a href="https://happyteamlabs.com/blog/ios-fixed-height-width-constraint-autolayout/" rel="noreferrer">link</a> for more detail 

UPDATE 
As you update your question, here is my updated answer... 

<pre><code>UILabel *Label1 = [[UILabel alloc] init];
[Label1 setTranslatesAutoresizingMaskIntoConstraints:NO];
UILabel *Label2 = [[UILabel alloc] init];
[Label2 setTranslatesAutoresizingMaskIntoConstraints:NO];

Label1.text = @"Label1";
Label1.backgroundColor = [UIColor blueColor];
Label2.text = @"Label2";
Label2.backgroundColor = [UIColor redColor];

[self.view addSubview:Label1];
[self.view addSubview:Label2];

// Width constraint
[Label1 addConstraint:[NSLayoutConstraint constraintWithItem:Label1
 attribute:NSLayoutAttributeWidth
 relatedBy:NSLayoutRelationEqual
 toItem:nil
 attribute: NSLayoutAttributeNotAnAttribute
 multiplier:1
 constant:280]];

// Height constraint
[Label1 addConstraint:[NSLayoutConstraint constraintWithItem:Label1
 attribute:NSLayoutAttributeHeight
 relatedBy:NSLayoutRelationEqual
 toItem:nil
 attribute: NSLayoutAttributeNotAnAttribute
 multiplier:1
 constant:21]];

// CenterX constraint
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.view
 attribute:NSLayoutAttributeCenterX
 relatedBy:NSLayoutRelationEqual
 toItem:Label1
 attribute: NSLayoutAttributeCenterX
 multiplier:1
 constant:0]];
// Top constraint
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:Label1
 attribute:NSLayoutAttributeTop
 relatedBy:NSLayoutRelationEqual
 toItem:self.topLayoutGuide
 attribute: NSLayoutAttributeBottom
 multiplier:1
 constant:40]];


// label2
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:Label1
 attribute:NSLayoutAttributeLeading
 relatedBy:NSLayoutRelationEqual
 toItem:Label2
 attribute: NSLayoutAttributeLeading
 multiplier:1
 constant:0]];
// label2.Height = label1.Height
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:Label1
 attribute:NSLayoutAttributeHeight
 relatedBy:NSLayoutRelationEqual
 toItem:Label2
 attribute: NSLayoutAttributeHeight
 multiplier:1
 constant:0]];
// label2.width = label1.width
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:Label1
 attribute:NSLayoutAttributeWidth
 relatedBy:NSLayoutRelationEqual
 toItem:Label2
 attribute: NSLayoutAttributeWidth
 multiplier:1
 constant:0]];

// label2.Top
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:Label2
 attribute:NSLayoutAttributeTop
 relatedBy:NSLayoutRelationEqual
 toItem:Label1
 attribute: NSLayoutAttributeBottom
 multiplier:1
 constant:34]]; 
</code></pre>

Result Screen 

<img src="https://i.stack.imgur.com/wAfJ9.png" alt="enter image description here">

blocks|key|130657|text|在Swift+3中：(只需将.Height替换为.height，将.Equal替换为.equal)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|130658|self.addConstraint(NSLayoutConstraint(item:+self,+attribute:+.height,+relatedBy:+.equal,+toItem:+nil,+attribute:+.notAnAttribute,+multiplier:+1,+constant:+35))|code-block|syntax|javascript|130659|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In Swift 3 : (just replace .Height by .height and .Equal by .equal)

<pre><code>self.addConstraint(NSLayoutConstraint(item: self, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: 35))
</code></pre>

blocks|key|132868|text|我尝试使用此方法将标签中的高度更改为文本长度。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|132869|放入viewdidload|132870|[yourlabel+setNumberOfLines:0];
++++CGRect+mainframe+=+_lbl_board.frame;
++++mainframe.size.height+=++[self+getLabelHeight:yourlabel];
++++yourlabel.frame+=+mainframe;|code-block|syntax|javascript|132871|方法|132872|-+(CGFloat)getLabelHeight:(UILabel*)label
{
++++CGSize+constraint+=+CGSizeMake(label.frame.size.width,+CGFLOAT_MAX);
++++CGSize+size;

++++NSStringDrawingContext+*context+=+[[NSStringDrawingContext+alloc]+init];
++++CGSize+boundingBox+=+[label.text+boundingRectWithSize:constraint
++++++++++++++++++++++++++++++++++++++++++++++++++options:NSStringDrawingUsesLineFragmentOrigin
+++++++++++++++++++++++++++++++++++++++++++++++attributes:@{NSFontAttributeName:label.font}
++++++++++++++++++++++++++++++++++++++++++++++++++context:context].size;

++++size+=+CGSizeMake(ceil(boundingBox.width),+ceil(boundingBox.height));

++++return+size.height;
}|132873|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

i try this method to change height as text length in your label. 

put viewdidload

<pre><code>[yourlabel setNumberOfLines:0];
 CGRect mainframe = _lbl_board.frame;
 mainframe.size.height = [self getLabelHeight:yourlabel];
 yourlabel.frame = mainframe;
</code></pre>

method

<pre><code>- (CGFloat)getLabelHeight:(UILabel*)label
{
 CGSize constraint = CGSizeMake(label.frame.size.width, CGFLOAT_MAX);
 CGSize size;

 NSStringDrawingContext *context = [[NSStringDrawingContext alloc] init];
 CGSize boundingBox = [label.text boundingRectWithSize:constraint
 options:NSStringDrawingUsesLineFragmentOrigin
 attributes:@{NSFontAttributeName:label.font}
 context:context].size;

 size = CGSizeMake(ceil(boundingBox.width), ceil(boundingBox.height));

 return size.height;
}
</code></pre>

I want to create a UILabel programmatically with height, width and then I want to add constraints to it also programmatically for positioning the UILabel.

Update: 

I want to create UI like this:

<img src="https://i.stack.imgur.com/kAemJ.png" alt="enter image description here">

How to create this UI All programatically

Code to create one label <code>label1</code> similarly I created two more label <code>label2</code> and <code>label3</code> 

<pre><code>UILabel *label1 = [[UILabel alloc]init];

label1.font = TitleFont;
label1.numberOfLines=0;
label1.text= @"Descriptions";
label1.lineBreakMode=NSLineBreakByWordWrapping;
[label1 sizeToFit];
label1.backgroundColor=[UIColor blueColor];
label1.textColor=[UIColor blackColor];
label1.translatesAutoresizingMaskIntoConstraints = NO;
[self.view addSubview:label1];
</code></pre>

And now I am able to add horizontal constraints them with this code

<pre><code>[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[label1]-|" options:NSLayoutFormatDirectionLeadingToTrailing metrics:nil views:NSDictionaryOfVariableBindings(label1)]];
</code></pre>

I am also able to set vertical constraint with view but I am unable to set constraint with from one label to another.

How to set UILabel only width and height and constraints programmatically

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我想以编程的方式创建一个具有高度和宽度的UILabel，然后我想以编程的方式为它添加约束，以定位UILabel。更新：我想创建这样的UI：​​How to create this UI All programatically创建一个标签label1的代码类似地，我又创建了两个标签label2和label3UILabel...

问如何以编程方式仅设置UILabel的宽度和高度以及约束
EN

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问如何以编程方式仅设置UILabel的宽度和高度以及约束
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