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I want to setup a custom color picker. I have setup a circular image with a picker bug. But, I want the bug to only move over the image (there are no colours outside the image), or, another way, only in the circle of the image size.
How can I limit the bug position?
I understand that you want to keep your picker inside the circle image.
To do that just simply grab center point (p1) of your circle image and center point (p2) of currnet position of the picker. Calculate distans between both:
float distance = sqrt((p2.x-p1.x)*(p2.x-p1.x)+(p2.y-p1.y)*(p2.y-p1.y));
And if the distance is more that circle radius stop move your picker:
if(distance <= radius)
return YES;// Let the picker move, it's inside the circle image
else
return NO; // Picker outside the circle image
Hope this is what you are about.
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I have following image,
from that I need to use separate images like below.
I don't know which kind of functionalities can be work here.
I don't want to just crop that image from photoshop or anything like that. I know there is some way to achieve this. But don't know how to get sub-image.
I've searched somewhere long ago but now can't find the way.
could you please help me to get this.
I've already visited here.
Swift 4
If I understood correctly you would want something like this:
[YOUR_FIRST_IMAGE]
let image = UIImage(named: "[YOUR_FIRST_IMAGE]")
let fromRect = CGRect(x:[OFFSET_HERE], y:0,width:[WIDTH_OF_EACH_ICON],height:[HEIGHT_OF_EACH_ICON])
let croppedImageFromRect = image?.cgImage!.cropping(to: fromRect)
let dottedCircleGreenImage = UIImage(cgImage: croppedImageFromRect!)
imageView.image = dottedCircleGreenImage
To select a different sub image from this collection ([YOUR_FIRST_IMAGE]) you have to offset the x (in the CGRect) with the width of each icon multiplied by the position of image you want minus 1.
For example to select the fifth one: . Get the width of a single icon than multiply it by 5.
Notes:
imageView in the above example is some outlet or form of reference to a UIImageView in a view.
force unwrapping variables is not a good practise, this is just per example.
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I was playing with iOS built-in Compass app and the UI do make me curious.
Here is the interesting part:
The color of text (even the circle) can be partially and dynamically changed.
I have made a lot of search, but the results are all about attributed string. How to implement the effect like this?
Edited:
I have tried to add two UILabels (whiteLabel and blackLabel) as whitelabel at the bottom and blackLabel at the top with the same frame. Then I set the circle as the mask of blackLabel.
The problem is 'whiteLabel' is totally covered by blackLabel, and if the circle do not intersect with 'blackLabel', both labels are not visible.
I imagine that there are two "14" labels in the same place. The bottom one is white and unmasked, and the top one is black and has a layer mask that contains two circles, so it's only visible where the circles are.
Achieving this has most probably nothing to do with NSAttributedStrings, like Woodstock said.
I'd say it's the UILabel's layer that is recolored live, depending on what other layer it intersects with, and the overlaying area of said intersection.
Once you figure those common points, you just apply a mask that inverts colors from there.
Now it's a little bit more complicated than that since there appears to be two circles (hence two layers to find intersections with), but in the end, it's "just a list of coordinates" that the label's coordinates intersects or not.
That could be an interesting exercise ; it would probably take me a decent amount of tries to mimic that behaviour, but I'm pretty confident my reasoning is on point. (get it? :o)
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I am trying to apply a sort of impulse onto a sprite and have it thrown onto the screen from the side. However, when it is after the screen I want the impulse to stop and for the regular physics to be applied to it, so I would be able to drag it around. Its difficult to explain but if anyone can help out it would be very much appreciated. Thanks!
Apple docs show that a we can influence the physicsBody of a sprite with these instance methods:
- applyForce:
- applyTorque:
- applyForce:atPoint:
- applyImpulse:
- applyAngularImpulse:
- applyImpulse:atPoint:
As for "throwing it on the screen from the side", you can have the sprite spawn outside your current skViews bounds, and have the force be applied to it accordingly (if the sprite is located outside the north side of the screen, you'll want to applyImpulse downward).
With respect to "regular physics" upon entrance of the skView, you can have a check in update:(CFTimeInterval)currentTime for those types of sprites entering the skViews frame OR define a protocol within your sprite's class, and have your SKScene subclass conform to that protocol; then have your sprite fire a method when entering a certain frame (skView.frame), which your SKScene will be able to respond to. You can then apply counter forces or impulses to that sprite.
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Or some kind of UI objects that can
interact with users
be drawn into any shape, for example, oval.
yes. It is pretty simple.
UIImage *buttonImage = [UIImage imageNamed:#"greenButton.png"];
UIImage *buttonImageHighlight = [UIImage imageNamed:#"greenButtonHighlight.png"];
[myCustomButton setBackgroundImage:buttonImage forState:UIControlStateNormal];
[myCustomButton setBackgroundImage:buttonImageHighlight forState:UIControlStateHighlighted];
It is possible to do it in a variety of ways. Rydgaze gave you the option for using a UIImage as your custom button. If you are looking for a code only way then I would suggest UIBezierPath. UIBezierPath allow's you to draw any shape that you want as well as customize the look. With UIBezierPath I could draw a star and fill it with anything that I would like.
Here is the link to the Reference: https://developer.apple.com/library/ios/documentation/uikit/reference/UIBezierPath_class/Reference/Reference.html
The idea is that you create a view class. In that view's drawRect method you will design whatever shape you are looking to create and customize it to what you see fit. For you button you would set its self.view to be the view that of your custom UIBezierPath class. That will just draw your custom shape as the button.
The advantage's to writing your button's in code are that it will for one be faster. It also takes up significantly less size because it isn't storing an image file. Also you are able to continue the customization of your shape. That mean's you could change the color, dimensions, etc. very easily.
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I try to create many markers in map with icon is a png image like placeholder.
After that i want to set an other image inside of each placeholder.
It looks like this.
My problem is how to set image inside image of marker.
How to do that?
You would need to write code which takes the background image (eg the frame) and adds on the sub-image (eg the food picture), to create a combined UIImage. Then you could use the combined UIImage as the marker's icon.
Check out these questions for some examples of how to draw 2 UIImage objects into a single UIImage:
Draw another image on a UIImage
Attempting to draw image on top of another image using a touch event