I am generating a custom header view for my UITableView which has two horizontal lines up & down and a UILabel in between.
let lineWidth = tableView.bounds.width //This is not correct, will never align with UITableViewCell
let offset = (tableView.bounds.width - lineWidth)/2 //This will always yield 0, but my question is to compute line width that aligns with UITableViewCell as shown in the image attached to this question.
let topLine = UIView(frame: CGRect(x: offset, y: 0, width: lineWidth, height: 1))
topLine.backgroundColor = UIColor.white
let bottomLine = UIView(frame: CGRect(x: offset, y: 49.0, width: lineWidth, height: 1))
bottomLine.backgroundColor = UIColor.white
let label = UILabel(frame: CGRect(x: 0, y: 1.0, width: tableView.bounds.width, height: 48.0))
label.textColor = UIColor.white
let headerView = UIView(frame: CGRect(x: 0, y: 0, width: tableView.bounds.width, height: 50))
headerView.addSubview(topLine)
headerView.addSubview(label)
headerView.addSubview(bottomLine)
Problem: I need the top & bottom lines to align with UITableViewCell bounds in the section as shown in the picture below. What I get with the code above is horizontal lines that cover the entire width of UITableView. How do I achieve it?
EDIT: Some answers here describe an arbitrary offset value, but the heart of the problem is how to compute offset that aligns with UITableViewCell bounds in the section? In other words, I need exact width of UITableViewCell's that go into the section.
Your Offset will be practically zero as you are subtracting the same things
let lineWidth = tableView.bounds.width
let offset = (tableView.bounds.width - lineWidth)/2
let topLine = UIView(frame: CGRect(x: offset, y: 0, width: lineWidth, height: 1)) // this line gonna give offset as zero and width of full tableview width
Change this to the below code and try
let lineWidth = tableView.bounds.width - 20
let topLine = UIView(frame: CGRect(x: 10, y: 0, width: lineWidth, height: 1))
It seems the issue with the position of your top & bottom lines. As per the calculation of offset it always set to 0 for top & bottom lines. So it would be better to remove that offset calculation and you can add some desired static value as a x for CGRect of top & bottom lines.
As far as we are going to move the position of x for the top & bottom line don't forget to remove the added value for x position from the width of the top & bottom lines.
let yourLine = UIView(frame: CGRect(x: some_value, y: 0, width: Int(lineWidth - (some_value * 2)), height: 1))
The best practice is you can use some variables to achieve this.
Related
I'm trying to build this:
But instead, I have this:
I haven't started working on background color or changing the slide's background color when selected yet.
My error right now is that I can't get the sizes right (you can tell that when I scroll to the end, it stops at slide 2).
How do I make the frame and slides fit correctly? (each slide is 188 width and 153 height).
Here's my code:
func setupSlideScrollView(slides : [Slide]) {
scrollView.frame = CGRect(x: 0, y: 0, width: 200, height: 160)
scrollView.contentSize = CGSize(width: 188 * CGFloat(slides.count), height: 153)
scrollView.isPagingEnabled = true
for i in 0 ..< 3 {
slides[i].frame = CGRect(x: view.frame.width * CGFloat(i), y: 0, width: 188, height: 153)
slides[i].backgroundColor = UIColor.red
scrollView.addSubview(slides[i])
}
}
For all the code, I'm following this tutorial (except Step 10+ since I don't need animation): https://medium.com/#anitaa_1990/create-a-horizontal-paging-uiscrollview-with-uipagecontrol-swift-4-xcode-9-a3dddc845e92
You are not giving the correct frame to the cells or tickets inside the scrollview.
var lastCellMaxX: CGFloat = 0
var constantSpacingBetweenCell: CGFloat = 10
for i in 0 ..< 3 {
slides[i].frame = CGRect(x: lastCellMaxX, y: 0, width: 188, height: 153)
slides[i].backgroundColor = UIColor.red
scrollView.addSubview(slides[i])
lastCellMaxX += 188 + constantSpacingBetweenCell
}
I didn't get what is view.frame and I think that is also of no use in your case.
Store the lastcellMaxX which is cell.origin.x + cellwidth + spacingBetweenCell,
That will be the x while giving frame to the next view
You have to add the space between two slides in the width parameter of scrollview.
In scrollview the content size is the total size of the content you are adding. so, if there is a space between two slides or if you have leading and trailing space then you have to add that total space in content size of scrollview.
For example, If the space between two slides is 10 then, the modified content size of scrollView is as below.
scrollView.contentSize = CGSize(width: 188 * CGFloat(slides.count) + CGFloat((slides.count - 1) * 10), height: 153)
I have added a UIImageView to my UITableView Header and now I am trying to center is, but it won't center, it goes to the right.
let imageHeader = UIImageView(frame: CGRect(x: 0, y: 0, width: self.tableView.frame.width, height: 50))
let header = UIView(frame : CGRect(x : 0, y : 0, width : self.tableView.frame.width, height : 200))
imageHeader.image = UIImage(named: "paindown-logo.png")
imageHeader.contentMode = .scaleAspectFit
imageHeader.center = CGPoint(x: header.bounds.midX, y: header.bounds.midY);
header.addSubview(imageHeader)
self.tableView.tableHeaderView = header
What am I doing wrong? Why will not center?
reload your imageHeader view then reload your table view after open menu.
If I change a UIView's bounds from...
v2.bounds = CGRect(0, 0, 70, 70)
to...
v2.bounds = CGRect(-2000, 0, 70, 70)
... nothing happens - the dimensions stay the same upon rendering. Why is this?
To help understand what bounds does, run this sample code in a view controller's viewDidLoad method:
let newView = UIView(frame: CGRect(x: 50, y: 100, width: 30, height: 30))
newView.backgroundColor = UIColor.blue
let secondView = UIView(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
secondView.backgroundColor = UIColor.red
newView.addSubview(secondView)
view.addSubview(newView)
DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
newView.bounds = CGRect(x: 10, y: 0, width: 30, height: 30)
}
Here we're moving the bounds to the right by 10 points, so you'll see the "second view" (which is red) move to the left by 10 points.
Changing the origin of the bounds changes the coordinate system of the view, which affects the location of all of it's subviews. It doesn't affect its origin with respect to its super view, however. For that, you should change the origin of the frame.
Bounds only takes into account width and height, you are only changing the origin in your example, only changing x to be precise. To accomplish this use frame property:
v2.frame = CGRect(-2000, 0, 70, 70)
I have been fighting with this all morning and can't seem to find a solution. I have created a UIImageView, filled it with red, then added it to a UIScrollView and set the contentSize to the size of the UIImageView. If I print the contentOffset i see (0, 0) and if I print the contentSize and the UIImageView.frame.size they are the same but the red "image" always appears smaller than what the scrollView thinks the contentSize is.
If I scroll all the way to the top I see a cyan stripe about 100 pixels high above the red image and the scroll bar will not make it all the way to the top of what I believe the top of my scroll view to be. Although the top of the scroll bar does line up with the top of my red window so it would seem as though the scroll view is confused as to where it actually lives. Or more likely, I'm confused
Here is my what seems like very simple code...
imgHorizon = UIImage.init(named:"horizon")!
imgBezel = UIImage.init(named:"bezel_transparent")!
imgWings = UIImage.init(named:"wings_transparent")!
imgViewHorizon = UIImageView.init()
imgViewBezel = UIImageView.init()
imgViewWings = UIImageView.init()
svHorizon = UIScrollView.init()
super.init(coder: aDecoder)
imgViewHorizon = UIImageView(frame: CGRect(x: 0, y: 0, width: imgBezel.size.width, height: imgHorizon.size.height))
imgViewHorizon.backgroundColor = UIColor.red
imgViewBezel = UIImageView(frame: CGRect(x: 0, y: 0, width: imgBezel.size.width, height: imgBezel.size.height))
imgViewBezel.contentMode = UIViewContentMode.center
imgViewBezel.clipsToBounds = true
imgViewBezel.image = imgBezel
imgViewWings = UIImageView(frame: CGRect(x: 0, y: 0, width: imgBezel.size.width, height: imgBezel.size.height))
imgViewWings.contentMode = UIViewContentMode.center
imgViewWings.clipsToBounds = true
imgViewWings.image = imgWings
svHorizon = UIScrollView(frame: CGRect(x: 0, y: 0, width: imgBezel.size.width, height: imgBezel.size.width))
svHorizon.contentSize = CGSize(width: imgBezel.size.width, height: imgHorizon.size.height)
svHorizon.contentMode = UIViewContentMode.scaleToFill
svHorizon.bounces = false
svHorizon.backgroundColor = UIColor.cyan
svHorizon.contentOffset = CGPoint(x: 0, y: 0)
svHorizon.addSubview(imgViewHorizon)
addSubview(svHorizon)
addSubview(imgViewBezel)
addSubview(imgViewWings)
From the discussion in the comments it turns out that the Adjust Scroll View Insets option was checked in the attributes inspector of the ViewController. Unchecking it resolved the problem. Have a look at the image below. You need to uncheck the highlighted option.
I have a UIView that holds a UILabel inside.
After applying affine transform on the UIView using:
myView.transform = CGAffineTransformMakeScale(4, 4);
My UILabel (which is a sub view to myView) grows as well.
Is there a way to prevent this?
i tried:
1) Using the CGAffineTransformIdentity flag on the label.
2) Adding a superview to myView and adding myView as superview's subview, and the label as a subview to the superview (and not myView).
Non of them seem to be working, the label keeps growing.
Any ideas?
You answered your own question with option 2. Not sure why it's not working since you did not supply any code. The playground code below shows it will work. Uncomment out the last line to transform the subview but not the label.
import UIKit
import XCPlayground
let superview = UIView(frame: CGRect(x: 10, y: 10, width: 200, height: 200))
XCPlaygroundPage.currentPage.liveView = superview
superview.backgroundColor = UIColor.redColor()
let view = UIView(frame: CGRect(x: 10, y: 10, width: 100, height: 100))
view.backgroundColor = UIColor.greenColor()
superview.addSubview(view)
let label = UILabel(frame: CGRect(x: 20, y: 10, width: 40, height: 40))
label.text = "Hello"
superview.addSubview(label)
//view.transform = CGAffineTransformMakeScale(2, 2)