I am trying to change the color and the font size of NSTextView but it doesn't seem to work.This is my code.I have checked other posts but they dont seem to be working.This is my code.
var area:NSRange = NSMakeRange(0, textView.textStorage!.length)
self.textView.setTextColor(NSColor.grayColor(), range: area)
self.textView.textStorage?.font = NSFont(name: "Calibri", size: 16)
You should use attributed strings:
let textView = NSTextView(frame: NSMakeRect(0, 0, 100, 100))
let attributes = [NSForegroundColorAttributeName: NSColor.redColor(),
NSBackgroundColorAttributeName: NSColor.blackColor()]
let attrStr = NSMutableAttributedString(string: "my string", attributes: attributes)
let area = NSMakeRange(0, attrStr.length)
if let font = NSFont(name: "Helvetica Neue Light", size: 16) {
attrStr.addAttribute(NSFontAttributeName, value: font, range: area)
textView.textStorage?.appendAttributedString(attrStr)
}
Related
I am trying to make the background color of a UItextfield blurry. When I try the code below, my app crashes when it runs. Has anyone tried this before and knows how to make a UITextfield blurry?
let p = UITextField()
let blurEffect = UIBlurEffect(style: .light)
let blurView = UIVisualEffectView(effect: blurEffect)
p.layer.isOpaque = true
p.layer.backgroundColor = blurView as! CGColor
I found a solution where you place a view behind the UITextfield, and make it transparent.
let v = UIView()
v.frame = CGRect(x: 30, y: 100, width: 180, height: 30)
let blurEffect = UIBlurEffect(style: .light)
let blurView = UIVisualEffectView(effect: blurEffect)
blurView.frame = v.bounds
blurView.backgroundColor = .clear
v.addSubview(blurView)
let p = UITextField()
p.frame = CGRect(x: 0, y: 0, width: 180, height: 30)
p.layer.isOpaque = true
p.backgroundColor = .clear
v.addSubview(p)
self.view.backgroundColor = .red
self.view.addSubview(v)
This is an example of proposed solution, with background image instead of red color, to emphasize the blur effect
self.view.backgroundColor = UIColor(patternImage: UIImage(named: "background") ?? UIImage())
How can I convert an RGB image into its grayscaled colour space? I can find a lot of code for iOS but non for macOS.. And the Apple's documentations are all in objective C....
let width = image.size.width
let height = image.size.height
let imageRect = NSMakeRect(0, 0, width, height);
let colorSpace = CGColorSpaceCreateDeviceGray();
let bits = image.representations.first as! NSBitmapImageRep;
bitmap!.representationUsingType(NSBitmapImageFileType.NSPNGFileType, properties: nil)
let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.none.rawValue);
let context = CGContext(data: nil, width: Int(width), height: Int(height), bitsPerComponent: 8, bytesPerRow: 0, space: colorSpace, bitmapInfo: bitmapInfo.rawValue);
context.draw(image.cgImage!, in : imageRect);// and this line is wrong obviously..
This is what I have got so far..just copy and pasting from the internet.. but I have no idea on how to go further...
I have found an interesting way to do this.. My code are simply copied from the three sources below.
how to create grayscale image from nsimage in swift?
Greyscale Image using COCOA and NSImage
Changing the Color Space of NSImage: The second reply
My Code:
func saveImage(image:NSImage, destination:URL) throws{
let rep = greyScale(image);
var data = rep.representation(using: NSJPEGFileType, properties: [:]);
try data?.write(to: destination);
}
// rgb2gray
func greyScale(image: NSImage) -> NSBitmapImageRep{
let w = image.size.width
let h = image.size.height
let imageRect : NSRect! = NSMakeRect(0,0, w, h);
let colourSpace : ColourSpace! = CGColorSpaceCreateDeviceGray();
let context : CGContext! = CGContext(data: nil, width: Int(w),
height: Int(h), bitsPerComponent: 8,
bytesPerRow: 0, space: colorSpace,
bitmapInfo: CGImageAlphaInfo.none.rawValue);
context.draw(nsImageToCGImage(image: image), in: imageRect);
let greyImage : CGImage! = context.makeImage();
return NSBitmapImageRep(cgImage: greyImage);
}
func nsImageToCGImage(image: NSImage) -> CGImage{
if let imageData = image.tiffRepresentation as NSData! {
let imageSource : CGImageSource! = CGImageSourceCreateWithData(imageData,
nil);
let image = CGImageSourceCreateImageAtIndex(imageSource, 0, nil);
return image;
}
return nil;
}
I am still trying to understand the principle behind.
You can try CIFilter. The annoyance is that you have to convert back and forth between NSImage and CIImage:
import Cocoa
import CoreImage
let url = Bundle.main.url(forResource: "image", withExtension: "jpg")!
let image = CIImage(contentsOf: url)!
let bwFilter = CIFilter(name: "CIColorControls", withInputParameters: ["inputImage": image, "inputSaturation": 0.0])!
if let ciImage = bwFilter.outputImage {
let rep = NSCIImageRep(ciImage: ciImage)
let nsImage = NSImage(size: rep.size)
nsImage.addRepresentation(rep)
// nsImage is now your black-and-white image
}
Image of the pixelated text in the UITextView
Does anyone have any suggestions? The image of the issue is in the clickable link above.
Code:
struct Views {
static var name_field: UITextView?
}
In the viewDidLoad()
Views.name_field = UITextView(frame: CGRectMake(0, 0, name_field_width, 50))
Views.name_field!.textAlignment = NSTextAlignment.Center
Views.name_field!.font = UIFont.systemFontOfSize(15)
Views.name_field!.autocorrectionType = UITextAutocorrectionType.No
Views.name_field!.keyboardType = UIKeyboardType.Default
Views.name_field!.returnKeyType = .Done
Views.name_field!.delegate = self
Calling this function to style it
styleIt(Views.name_field!)
Adds a bottom border style and then sets the font, etc.
func styleIt(target: UITextView){
target.layer.backgroundColor = UIColor.clearColor().CGColor
let _border = CAShapeLayer()
_border.backgroundColor = UIColor.whiteColor().CGColor
_border.frame = CGRectMake(0, CGRectGetHeight(target.frame) - 1.0, CGRectGetWidth(target.frame), 1.0)
_border.shadowColor = UIColor.whiteColor().CGColor
_border.shadowOffset = CGSize(width: 3, height: 3)
_border.shadowOpacity = 0.23
_border.shadowRadius = 4
target.layer.addSublayer(_border)
target.font = UIFont(name: "ClementePDaa-Hairline", size: 24)
target.textColor = UIColor.whiteColor()
target.textContainerInset = UIEdgeInsets(top: 20, left: 0, bottom: 0, right: 0)
applyPlaceholderStyle(target, placeholderText: _SEARCH_TEXT)
target.returnKeyType = .Done
target.frame = CGRectIntegral(target.frame)
target.layer.shouldRasterize = true
_border.shouldRasterize = true
target.textInputView.layer.shouldRasterize = true
}
This UITextView is a subview of search_field which is simply a UIView
search_field!.addSubview(Views.name_field!)
Your text view is blurry because the frame is using floating numbers.
To force integers value for your frame just do :
textView.frame = CGRectIntegral(textView.frame)
I'm trying to put a view with subviews. The view has an image and a text, which are subviews, but when i run the app, it doesn't show the complete text. Here is the code…
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let ballonview = UIImageView()
let label = UILabel()
let turn = 1
ballonview.frame = CGRectZero
label.frame = CGRectZero
label.backgroundColor = UIColor.clearColor()
label.numberOfLines = 0
label.lineBreakMode = NSLineBreakMode.ByWordWrapping
label.font = label.font.fontWithSize(20)
let message = UIView()
message.frame = CGRectMake(-160, 48, view.frame.size.width, view.frame.size.height)
message.addSubview(ballonview)
message.addSubview(label)
let text: NSString = "hola como estas"
let size:CGSize = text.boundingRectWithSize(CGSizeMake(240.0, 480.0), options: NSStringDrawingOptions.UsesDeviceMetrics, attributes: [NSFontAttributeName: UIFont.systemFontOfSize(14.0)], context: nil).size
var ballon:UIImage = UIImage()
ballonview.frame = CGRectMake(320.0 - (size.width + 28.0), 2.0, size.width + 28.0, size.height + 15.0)
ballon = UIImage(named:"green.png")!.stretchableImageWithLeftCapWidth(24, topCapHeight: 15)
label.frame = CGRectMake(307.0 - (size.width + 5.0), 8.0, size.width + 5.0, size.height)
ballonview.image = ballon;
label.text = text as String
view.addSubview(message)
}
What can I do?
The problem here is that you are using different font sizes when measuring the size and rendering.
The font of label is 20pt system font, and the font you use for measuring size is 14pt system font. So the size will be smaller than you expected.
Also, the drawing options should be changed to NSStringDrawingUsesLineFragmentOrigin in order to get the correct size if you have characters with long legs (like g, j, y).
Reference: official NSString document.
I'd suggest you change the way you measure the size:
let size: CGSize = text.boundingRectWithSize(
CGSizeMake(240.0, 480.0),
options: .UsesLineFragmentOrigin,
attributes: [
NSFontAttributeName: label.font
],
context: nil
).size
So it will match the font you use for rendering the label.
I hope this answer helps you.
I would like to create a pdf dynamically. But I have problems with new pages.
Currently I am writing a text block and if that text block does not fit to the remaining Y position - I write the whole text block on a new page.
But I would like to take the whole text block, write to the actual page as much as I can and write the rest on a new page. Does someone know how to split the text in a rect depending on the rect size?
Thats the code:
writeString ist coming from CoreData and has a dynamic length.
func drawTextBlock(pdfFileName: String, writeString: NSString = " ", fontSize: CGFloat = 12.0, fontName: String = "Helvetica", textAlignment: NSTextAlignment = NSTextAlignment.Natural) {
//Text attribute configuration
let font = UIFont(name: fontName, size: fontSize)
let textStyle = NSMutableParagraphStyle.defaultParagraphStyle().mutableCopy() as! NSMutableParagraphStyle
textStyle.alignment = textAlignment
let textFontAttributes = [
NSFontAttributeName: font!,
NSParagraphStyleAttributeName: textStyle
]
let textSize = writeString.sizeWithAttributes(textFontAttributes)
let linesNeeded = ceil(textSize.width / (myPageCalibration.pageWidth - myPageCalibration.xOffsetLeft - myPageCalibration.xOffsetRight))
if remainingSpaceY >= (textSize.height * linesNeeded) {
//draw text in rectangle
writeString.drawInRect(CGRectMake(myPageCalibration.xOffsetLeft, myPageCalibration.yOffsetUp + currentPositionY, myPageCalibration.pageWidth - myPageCalibration.xOffsetLeft - myPageCalibration.xOffsetRight, (textSize.height * linesNeeded )), withAttributes: textFontAttributes)
//calc remainingSpace
currentPositionY = CGFloat(linesNeeded * textSize.height) + currentPositionY
remainingSpaceY = remainingSpaceY - (textSize.height * linesNeeded)
}
else {
//next page
UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, 595, 842), nil);
remainingSpaceY = myPageCalibration.pageHeight - myPageCalibration.yOffsetDown - myPageCalibration.yOffsetUp
currentPositionY = 0
drawTextBlock(pdfFileName, writeString: writeString, fontSize: fontSize, fontName: fontName, textAlignment: textAlignment)
}
}