The best way to describe my situations is with images. What I have is a view which contains several UILabels and UIImage. The red box is a UILabel and if the content is too big it should go to the second line.
From the storyboard I have a working case when the content fits but the problem is that I am not sure how to handle the case when the last (red box) should go to the second line. I am using autolayout and cartography.
If someone can point me to the right direction I will be very grateful.
First calcululate width of text as per your current label's position.
If text width is more than current label's width then see my answer from below link:
Auto Layout how to move the view2 from right to the bottom?
Calculate width:
func widthForView1(_ text:String, font:UIFont, height:CGFloat) -> CGFloat
{
let label:UILabel = UILabel(frame: CGRect(x: 0, y: 0, width: your_label_width, height: your_lable_height))
label.numberOfLines = 0
label.lineBreakMode = NSLineBreakMode.byWordWrapping
label.text = text
label.font = font
label.sizeToFit()
return label.frame.width
}
You cannot do that with constraints only. To change the entire position of the element on the screen, you need to do it programmatically.
Use of tag View can solve this issue. TagListView is an external library.
When u add a view as subclass of taglistView, its height automatically increases accordingly.
ADD this to pod file : pod 'TagListView'
func addTags() {
let str1 = "Hi"
tagListView.addTag(str1)
let str2 = "Helloo"
tagListView.addTag(str2)
let str3 = "How Are u ? "
tagListView.addTag(str2)
tagListView.isUserInteractionEnabled = false
}
Related
I have been looking around for a way to set the alignment of the segmented control titles to the left but I don't seem to be able to achieve what I want.
I have created this little function to change the frame of the subviews of the segment control.
It works at first.
func modifyFrameOfSegment() {
for segment in segmentedControl.subviews {
guard segment.subviews.isNotEmpty else { return }
segment.contentMode = .left
for label in segment.subviews where label is UILabel {
label.frame = CGRect(x: 0, y: label.frame.origin.y, width: label.frame.size.width, height: label.frame.size.height)
(label as! UILabel).textAlignment = .left
}
}
}
But everytime I select a new segment it resets the frames of all the subviews and center align all the titles again.
Is there a way to achieve a permanent left alignment for the segment titles in a segmented control?
Any tips or advice would be greatly appreciated.
Thank you for your time.
Let's use this method
self.segmentedControl.setContentPositionAdjustment(UIOffset(horizontal: -20, vertical: 0), forSegmentType: .left, barMetrics: .default)
And you can do what you want (Of course, you can change the horizontal & vertical value by your needs). Here is the result:
Update:
There's apparently no way to set the alignment of the items, but you can fake it by adjusting the position of each individual item using setContentOffset(_ offset: CGSize, forSegmentAt segment: Int). Here's a kludgy example:
class LeftSegmentedControl: UISegmentedControl {
var margin : CGFloat = 10
override func layoutSubviews() {
super.layoutSubviews()
leftJustifyItems()
}
func leftJustifyItems() {
let fontAttributes = titleTextAttributes(for: .normal)
let segments = numberOfSegments - 1
let controlWidth = frame.size.width
let segmentWidth = controlWidth / CGFloat(numberOfSegments)
for segment in 0...segments {
let title = titleForSegment(at: segment)
setWidth(segmentWidth, forSegmentAt: segment)
if let t = title {
let titleSize = t.size(withAttributes: fontAttributes)
let offset = (segmentWidth - titleSize.width) / 2 - margin
self.setContentOffset(CGSize(width: -offset, height: 0), forSegmentAt: segment)
}
}
}
}
Here's what it looks like:
There are a few caveats:
This version sets the segments to all have equal width, which might not be what you want.
I used a fixed left margin of 10px because it seems unlikely that you'd want to vary that, but you can obviously change it or make it a settable property.
Just because you can do this doesn't mean you should. Personally, I don't think it looks great, and it suffers in the usability department too. Users expect segmented control items to be centered, and left-justifying the items will make it harder for them to know where to tap to hit the segment. That seems particularly true for short items like the one labelled "3rd" in the example. It's not terrible, it just seems a little weird.
Original answer:
UIControl (of which UISegmentedControl is a subclass) has a contentHorizontalAlignment property that's supposed to tell the control to align its content a certain way, so the logical thing to do would be to set it like this:
let segmented = UISegmentedControl(items: ["Yes", "No", "Maybe"])
segmented.frame = CGRect(x:75, y:250, width:250, height:35)
segmented.contentHorizontalAlignment = .left
But that doesn't work — you still get the labels centered. If you've got a compelling use case for left-aligned segments, you should send the request to Apple.
One way you could work around this problem is to render your labels into images and then use the images as the segment labels instead of plain strings. Starting from the code in How to convert a UIView to an image, you could easily subclass UISegmentedControl to create images from the item strings.
I have a UILabel that is designed to expand in height when the width of the text's CGSize is greater than the width of the label. I accomplish that with this code:
func viewHeight(_ locationName: String) -> CGFloat {
let locationName = tappedLocation[0].name
var size = CGSize()
if let font = UIFont(name: ".SFUIText", size: 17.0) {
let fontAttributes = [NSAttributedStringKey.font: font]
size = (locationName as NSString).size(withAttributes: fontAttributes)
}
let normalCellHeight = horizontalStackViewHeightConstraint.constant
let extraLargeCellHeight = horizontalStackViewHeightConstraint.constant + 20.33
let textWidth = ceil(size.width)
let cellWidth = ceil(nameLabel.frame.width)
if textWidth > cellWidth {
return extraLargeCellHeight
} else {
return normalCellHeight
}
}
Lines = 0 and line break style = Word Wrap:
The label lives inside a vertical stackView, and is constrained to its top, leading and trailing edges and a stackView beneath it. The height of the label and the UIView properly expand in height when the CGSize width of the text is longer than the width of the label. All well and good.
However, the words do not wrap consistently. This behavior is intentional:
Bobby Mao's Chinese Kitchen & Bar:
XL cell. Width: 184.0,
Text width: 287.0
This behavior is not (why isn't "steak" on the prior line?):
Ruth's Chris Steak House:
XL cell. Width: 184.0,
Text width: 204.0
And neither is this (why didn't Gina wrap if it's over the label width parameter?):
Ristorante Mamma Gina:
XL cell. Width: 184.0,
Text width: 191.0
I have also set a temporary background color on my label to ensure that it does, in fact correspond to the intended width. The label in this example creates another line when the label's width is exceeded, but the text does not wrap:
I have read the other entries on Stack Overflow about word wrapping. I don't believe this is a duplicate. I do not have trouble creating two lines for my text. I don't have trouble with word wrapping occurring. I have trouble with how and when it is occurring.
I think the intent is clear... what am I missing?
I'm trying to get my UILabel to get wider (along with its border and background color) as the content gets more - and then less when the content is reduced.
Where do I go to get started, I've looked at the Attributes Inspectors and it looks like this can only be done with code (which I'm fine with).
I thought adding two labels in a horizontal stack would do the trick, but it doesn't update in real-time (it will update the label only on launch).
Try using :
myLabel.sizeToFit()
on your label.This should update the label's frame to fit the content.
let label:UILabel = UILabel()
label.textColor=UIColor.black
label.font = UIFont(name: "Halvetica", size: 17)
label.numberOfLines = 1
label.text = "your string"
label.sizeToFit()
label.frame = CGRect(x: 5, y: imageView.frame.height+10, width: label.frame.width, height:label.frame.height)
I have 2 UILabels. lbl1's text can change, while lbl2's text is static.
They are both initially set on the same line. I have lbl1's numberOfLines set to 0 (infinity). I would like lbl2 to push down and align its top to lbl1's bottom when lbl1's width encroaches on lbl2's space. I have a current solution, but feel there's a pure autolayout way I'm missing. Any help would be great!
Both labels fit on 1 line:
lbl2 does not shift down in my attempts at pure autolayout:
Desired:
Current solution works, but feels un-ideal:
import XCPlayground
import SnapKit
import UIKit
let screen: UIView = UIView(frame: CGRectMake(0,0,320,568))
XCPlaygroundPage.currentPage.liveView = screen
XCPlaygroundPage.currentPage.needsIndefiniteExecution = true
let lbl1: UILabel = UILabel()
lbl1.text = "Short Text asnoetuha 1 1 1 1 "
lbl1.numberOfLines = 0
lbl1.backgroundColor = UIColor.whiteColor()
let lbl2: UILabel = UILabel()
lbl2.text = "Amount Text"
lbl2.backgroundColor = UIColor.yellowColor().colorWithAlphaComponent(0.5)
screen.addSubview(lbl1)
screen.addSubview(lbl2)
lbl1.snp_makeConstraints { (make: ConstraintMaker) in
make.top.leading.equalTo(screen)
make.width.lessThanOrEqualTo(screen.snp_width)
}
lbl2.snp_makeConstraints { (make: ConstraintMaker) in
// Below lines feel un-ideal
let lbl2X: CGFloat = screen.frame.width - lbl2.intrinsicContentSize().width
let lbl1RightX: CGFloat = screen.frame.origin.x + lbl1.intrinsicContentSize().width
let hasOverlap: Bool = lbl1RightX >= lbl2X
make.top.equalTo(hasOverlap ? lbl1.snp_bottom : lbl1.snp_top).priorityLow()
make.trailing.equalTo(screen)
}
I do believe you are not approaching this the right way. You should be able to create a function that listens for when lbl1 has its right anchor come into contact with lbl2's left anchor (very easy with SnapKit).
When this does happen, you call a function that remakes the constraints to how fit the image you provided. This is done with a call to snap_updateConstraints or snp_remakeConstraints. Then your constraint code should be straight forward as you would just pin the bottom anchor of lbl1 to the top anchor of lbl2 and then just make the other constraints until you get that desired effect.
I'm a beginner in creating a custom view. I'm trying to create a custom UIView with a scrollview and buttons that will look like this:
I'm adding a view(view with label of page number) inside of scrollView depending on the the number of pages. Is that how it should be?
Currently it looks like this:
My question is how can I center the subviews of scrollview? and next is what's wrong with this code? Why is that I can only see 1 label inside the view? and the other doesn't show up. How can I scroll to the selected page if the page number is not visible already in the scrollview?
Here's my code:
func addPageNumberViewWithCount(count: Int) {
var pageNumberViewX: CGFloat! = 0
let pageNumberViewDistance: CGFloat! = 10
for i in 1...count {
let pageNumberView = UIView(frame: CGRectMake(pageNumberViewX, 0, 30, 30))
pageNumberView.backgroundColor = UIColor.redColor()
pageNumberView.layer.cornerRadius = pageNumberView.frame.height / 2
pageNumberView.layer.masksToBounds = true
pageNumberView.clipsToBounds = true
// add number label
let label = UILabel(frame: CGRectMake(pageNumberViewX, 0, 30, 30))
label.center = pageNumberView.center
label.text = "\(i)"
label.textAlignment = .Center
pageNumberView.addSubview(label)
// update x for next view
pageNumberViewX = pageNumberView.frame.origin.x + pageNumberView.frame.width + pageNumberViewDistance
// add view inside scrollview
scrollView.addSubview(pageNumberView)
if i == count {
scrollView.contentSize = CGSizeMake(pageNumberViewX + pageNumberView.frame.width, 30)
}
}
}
Part of my answer will go to providing a solution to your question,and another part of my answer will go toward strongly suggesting that this not be the method you use to complete your desired tasks.
At this point, AutoLayout and Interface Builder have come a long way. Where they used to be difficult to use because of their inconsistency and unpredictability, they are now highly predictable and consistent as long as you understand the tools and how to use them.
Apple's suggested method for completing this task (which I mostly stand behind) is creating a .xib file (nib) to lay out the base components of the design, and to load the nib into the view or view controller whenever that design should be used. My question for you: have you tried this, or have you determined for some reason that this would be an unsatisfactory solution to your problem? AutoLayout exists to solve these problems not just in allowing you to achieve your desired solution in this one situation but to achieve it in other situations as well, with varying screen sizes and device types.
Now, if you were to simply ignore all of that and continue on your path, there would be a few good ways to handle your problem. One suggested solution I have:
1) Wrap your pageNumberView in another view. Constrain that view to the size of the scrollView. Doing this gives the scrollView content with which to base its scrollable content size, and gives the inner pageNumberView something to compare itself to.
2) Center the pageNumberView horizontally in its container (the new view that we just created).
Doing this, the page numbers should now center themselves in the container until they reach a size where they exceed the width of the scrollView. At that point, they will then continue to expand, making the area horizontally scrollable.
I can provide code examples of how you would do this, but frankly I would much prefer if you scrapped the idea of doing things this way and instead opted for the AutoLayout method at least, and perhaps even the Interface Builder method. I started out with iOS the same way you did, trying to do everything in code. It really isn't the best way to do things, at least with regard to iOS.
Edit: I've provided an example of how this would look in Interface Builder using UINib. I've populated the view with an example of 5 pages to show what it is like. I will see if I can make a GIF or something similar to show what each of the subviews look like.
For the OP, my suggestion would be this: Use this for reference, and go learn the constraints system. It is extremely unlikely that you will find success with iOS if you do not learn and utilize the constraints system. Coding in X values to a UIView's frame is only going to create a product with poor, inconsistent performance across devices, and will take much, much longer than it would to take the time to learn constraints.
Perhaps you should have a UICollectionView with a cell for each of these buttons. That's a better way of doing this, and you can lay it out again when the screen rotates and it changes width.
Those cells will layout offset to the left. You can solve that this way:
let pageNumberViewTotalWidth = 30 * count + (pageNumberViewDistance * count - 1)
self.collectionView.contentInset.left = (self.collectionView.frame.size.width - pageNumberViewTotalWidth) / 2
The labels aren't showing up because you're setting their frame's x to be the same as the page number view's x. It's frame should be relative to it's superview, in this case pageNumberView.
First Question of yours "how can I center the subviews of scrollview?"
Solution: lets suppose you have in total 50 pages and you want to show 5 pages at a time in the scrollview.
Then make 10 subviews of equal widths where each subview width will be equal to visible portion of the collection view that is
self.view.size.width - 2*(width of toggle button)
Then in each container view add 5 of your pageNumberView placed at equal distance
lets pageNumberViewWidth = container.width/5 - 2*margin
now pageNumberView frame will be (margin,0,pageNumberViewWidth,height)
In this way in each container view your pageNumberViews will be placed equally and it will look as if you have centred them.
Second Question "Why is that I can only see 1 label inside the view?"
Answer : Its because you are setting label frame incorrectly
let label = UILabel(frame: CGRectMake(pageNumberViewX, 0, 30, 30))
Here label is the subview of pageNumberView So you have to set its frame according to its parent's view which is pageNumberView, so change it to
let label = UILabel(frame: CGRectMake(0, 0, 30, 30))
First time it was right because pageNumberViewX is 0 for first iteration after that it become some positive value which makes its frame shifted to right but its parent's width is small so its not visible to you.
Third Question : "How can I scroll to the selected page if the page number is not visible already in the scrollview?"
For this you need to find the frame of your selected page:
you can do that by using the offset that you used to create pageNumberView.
(width of each pageNumberView)*pageNumber = starting point of the required pageNumberView.
let frame : CGRect = CGRectMake(calculated offset above, 0,30, 30)
//where you want to scroll
self.scrollView.scrollRectToVisible(frame, animated:true)
I hope this will help you in solving your problem
Edit for first problem
func addPageNumberViewWithCount(count: Int) {
var containerViewX: CGFloat! = 0
let pageNumberViewDistance: CGFloat! = 10
let pageNumberViewPerSubview = 5
var numberOfSubview = count/pageNumberViewPerSubview
if(count % pageNumberViewPerSubview > 0){
numberOfSubview = numberOfSubview + 1
}
var pagesLeft = count
for i in 1...numberOfSubview {
var pageNumberViewX: CGFloat! = 0
let containerView : UIView = UIView(frame:CGRectMake(containerViewX,0,scrollView.frame.size.width,scrollView.frame.size.height))
if(pagesLeft < pageNumberViewPerSubview){
for k in 1...pagesLeft{
}
}
else{
for j in 1...pageNumberViewPerSubview{
let pageNumberView = UIView(frame: CGRectMake(pageNumberViewX, 0, 30, 30))
pageNumberView.backgroundColor = UIColor.redColor()
pageNumberView.layer.cornerRadius = pageNumberView.frame.height / 2
pageNumberView.layer.masksToBounds = true
pageNumberView.clipsToBounds = true
// add number label
let label = UILabel(frame: CGRectMake(0, 0, 30, 30))
label.text = "\(i)"
label.textAlignment = .Center
pageNumberView.addSubview(label)
// update x for next view
pageNumberViewX = pageNumberView.frame.origin.x + pageNumberView.frame.width + pageNumberViewDistance
containerView.addSubview(pageNumberView)
}
containerViewX = containerViewX + scrollView.frame.size.width
// add view inside scrollview
scrollView.addSubview(containerView)
pagesLeft = pagesLeft - pageNumberViewPerSubview
}
if i == count {
scrollView.contentSize = CGSizeMake(numberOfSubview*scrollView.frame.size.width, 30)
}
}
}