iOS gradient NSArray problem

Elements C#
1

Hello

There is any issue with NSArray and WithObjects. I’m trying to set gradient for button. This code do not compile because first NSArray parameter should be id - compiler says. Casting it to id give error that it cannot be casted as id. Closed circle. In Objective-c all params for gradient are casted as id.

CAGradientLayer gradientLayer = CAGradientLayer.layer();
gradientLayer.frame = butt.layer.bounds;
gradientLayer.colors = new NSArray WithObjects(UIColor.blackColor.CGColor, UIColor.whiteColor.CGColor, null);
gradientLayer.locations = NSArray.arrayWithObjects(NSNumber.numberWithFloat(0), NSNumber.numberWithFloat(1), null);
gradientLayer.cornerRadius = butt.layer.cornerRadius;
butt.layer.addSublayer(gradientLayer);

This one works, but first parameter is ignored in gradient (must be CGColorRef):

gradientLayer.colors = new NSArray WithObjects(UIColor.blackColor, UIColor.whiteColor.CGColor, null);

How to resolve, what I’m doing wrong?

Original Objective-C code (colors are different). Please use oxidizer and try to compile:

gradientLayer.colors = [NSArray arrayWithObjects:
(id)[UIColor colorWithWhite:1.0f alpha:0.1f].CGColor,
(id)[UIColor colorWithWhite:0.4f alpha:0.5f].CGColor,
nil];

Aha, QuartzCore reference must be added.

[EDIT[

Temporary workaround is to define first object and location as UIColor (blank - which is bad as color value for gradient), second param will be first color and add location for second (really first) same as first.

gradientLayer.colors = new NSArray WithObjects(UIColor.blackColor, UIColor.blackColor.CGColor, UIColor.whiteColor.CGColor, null);
gradientLayer.locations = NSArray.arrayWithObjects(NSNumber.numberWithFloat(0), NSNumber.numberWithFloat(0), NSNumber.numberWithFloat(1), null);

b.r.

2

Thanks, logged as bugs://72706

3

bugs://72706 got closed with status fixed.

4

Just small info. Got beta access and first testing fire and there this bug exists too. I know is not listed in changelog (not fixed), but just info that fire is affected.
Good work!

b.r.

5

Hmm checked beta 8.2.88.1811 in VS and is not fixed. Still cannot compile:

gradientLayer.colors = new NSArray WithObjects(UIColor.blackColor.CGColor, UIColorFromRGB(0xFF00FF00).CGColor, null);

First parameter must be as CGColor.

Error code:

Error 3 (E486) Parameter 1 is “CGColorRef”, should be “id”, in call to instancetype NSArray.initWithObjects(id firstObj, params dynamic[] param1)

b.r.

6

bump, maybe my response was not noticed, but bug still exist :smile:

b.r.

7

My apologies. I’ll personally have look tomorrow (i’m traveling today)

8

bugs://72706 got reopened.

9

np. take Your time :slight_smile: 'm just tracking progress :slight_smile:

10

Refreshing with question if issue was checked? :smile:

b.r.

11

Try this:
new NSArray WithObjects(bridge(UIColor.blackColor.CGColor), bridge(UIColor.greenColor.CGColor), null);

12

bugs://72706 got closed with status fixed.

13

I got error message while compile:

Error 1 (E0) Internal error: Object reference not set to an instance of an object

ps. Too fast with fixing :slight_smile: Is not fixed :smile:

b.r.

14

Got a full fragment I can try? I tried what I pasted.

15

try this please:

[IBOutlet]
    public UIButton butt { get; set; }
     
    public override void viewDidLoad()
    {
    	base.viewDidLoad();
     
    	CAGradientLayer gradientLayer = CAGradientLayer.layer();
    	gradientLayer.frame = butt.layer.bounds;
    	gradientLayer.colors = new NSArray WithObjects(bridge(UIColor.blackColor.CGColor), bridge(UIColor.greenColor.CGColor), null);
    	gradientLayer.locations = NSArray.arrayWithObjects(NSNumber.numberWithFloat(0), NSNumber.numberWithFloat(1), null);
    	gradientLayer.cornerRadius = butt.layer.cornerRadius;
    	butt.layer.addSublayer(gradientLayer);
    }

b.r.

16

Ah! My paste lost <id>, try this (next version will properly error)


			  	CAGradientLayer gradientLayer = CAGradientLayer.layer();
    	gradientLayer.frame = butt.layer.bounds;
    	gradientLayer.colors = new NSArray WithObjects(bridge<id>(UIColor.blackColor.CGColor), bridge<id>(UIColor.greenColor.CGColor), null);
    	gradientLayer.locations = NSArray.arrayWithObjects(NSNumber.numberWithFloat(0), NSNumber.numberWithFloat(1), null);
    	gradientLayer.cornerRadius = butt.layer.cornerRadius;
    	butt.layer.addSublayer(gradientLayer);
17

it’s working now ! :slight_smile: Thank You :smile:
So it will be like this, I mean always need to use bridge or it will be changed in future?

b.r.

18

Yes always bridge; I think objc requiers it too when ARC is enabled.

19

Okay. Just read again about bridge and was mentioned that can be used to cast to id. Thanks!

b.r.