This is probably an easy one but I want to hide variably named UI elements in a loop:
int i = intFigures + 1;
while (i <= 16) {
imagei.hidden = TRUE;
i++
}
Essentially I need to display a number of images between 1 and 16 depending on the record. If that particular record only has 12 images, I want to hide UIImage 13 through 16. How do I set the UIImage that I am trying to hide based on the increment of the loop?
You cannot just append the variable i to the name of the image variable. You probably already have your ImageViews in an array, why not just iterate over that.
for(UIImageView *image in myArrayOfImageViews) {
image.hidden = YES;
}
Alternatively, if your imageViews are added directly to your current view, you could just iterate over its subviews. When you add the images, you could give certain imageViews a specific tag so that you can later identify them. Such as:
for(UIView *view in [self.view subviews]) {
if (view.tag == SOME_MAGIC_NUMBER) view.hidden = YES;
}
Related
This is my first year of vex. I am taking on the role of programmer.
I have had this idea for rapid autonomous creation, recording the driver. Instead of the usual array/debugger dump of raw streams of power levels, I had the idea of extracting functions from driver movement.
I wont go into the details, and I can code it myself, but I need some help.
There is one thing I am unable to do simply because of my lack of coding experience.
I want to create a for loop that checks every joystick button one by one.
For example:
struct button
{
bool pressed;
}
for(int i = 0; i>12; i++) //12 is number of buttons on the joystick
{
struct button button<cycle through buttons>;
}
I want there to then be:
struct button button6U;
struct button button6D;
struct button button6R;
etc.
Then, I want this:
for(int i = 0; i>12; i++) // 12 is number of buttons on the joystick
{
if(VexRT[<currentButton>])
{
button<currentButton>.pressed = true;
}
}
I have no idea how to do this, with a wildcard modifing the actual variable name I am writing to.
A couple thoughts:
A for statement would have no idea how to advance the order of joystick buttons. So something I think I might need is:
orderOfButtons
{
VexRT[6U];
VexRT[6D];
VexRT[6R];
// etc.
}
I just cant seem to figure out how to have a variable defining what VexRT[]button I am reading from.
Any help would be appreciated!
Thanks.
Sounds like you want an array:
#define NUMBER_OF_BUTTONS 12
...
struct button VexRT[NUMBER_OF_BUTTONS];
If you want to use symbolic constants to refer to specific buttons in the array, you can use an enumeration:
enum btn_id { BTN_6U, // maps to 0
BTN_6D, // maps to 1
BTN_6R, // maps to 2
...
}
Enumeration constants are represented as integers, and by default they start at 0 and increment by 1. You can initialize them to different values if you want, and multiple enumeration constants can map to the same value. I take advantage of this when I want to identify a "first" and "last" enumeration for looping, like so:
enum btn_id {
BTN_6U,
BTN_FIRST = BTN_6U, // both BTN_FIRST and BTN_6U will map to 0
BTN_6D,
BTN_6R,
...
BTN_whatever,
BTN_LAST
};
Thus, VexRT[BTN_6U] maps to VexRT[0], VexRT[BTN_6D] maps to VexRT[1], etc.
Note that this way, you don't have to loop through all the buttons just to set one:
enum btn_id currentButton = BTN_6D;
...
VexRT[currentButton].pressed = true;
If you do want to loop through the whole set, you can use
for ( enum btn_id i = BTN_FIRST; i < BTN_LAST; i++ )
{
VexRT[i].pressed = false;
}
So, what you want is to sample the user input (at some specified rate), then record it into an array, then play that back at a later time? If you have functions that drive the VEX (I'm not familiar with that), each of which are associated with an input, you can use an array of function pointers to create your output.
#define MAX_ACTION 12
#define MAX_RECORDED 200
// Declare your array of function pointers
int (*action[MAX_ACTION])(void);
// Declare your stored array of recorded actions
int recorded[MAX_RECORDED];
...
// Assign function pointers to associated functions
action[0] = go_forward;
action[1] = turn_right;
...
// Record your actions into some array
while (...)
{
// Record the action
recorded[i++] = get_action();
// Sample delay
}
...
// Playback the actions
for (i=0;i<RECORDED;i++)
{
(*action[recorded[i]])();
// delay here
}
P.S. Your for loop is backward (i<12 not i>12).
I think you are trying to access the events coming from the joystick. You can just loop through the array of values and record them. I think the channels on the joystick are simply accessed like: vexRT[x] where x is 1-12. If you just want to store the latest value from each channel you could do this:
int value[12];
for(i=0; i<12; i++)
{
value[i] = vexRT[i];
}
If you want to store all of the values so that you can map them or play them back or something then you will need a more complex data structure to store them, like a list of the value arrays.
I also have found documentation that says the values are accessed by like vexRT[Chx] where x is 1-12, so you could alternatively create a string and use it to access the joystick channels inside your loop:
string *s = (char *)malloc(5*sizeof(char)); //5 is the max length of the null terminated string
for() . . . {
sprintf(s,"Ch%d", i);
value[i] = vertRT[s];
}
I'm using SpriteKit and Swift 3 to create a simple game.
I have an array of Rings/Circles:
mRings = [mRingOne, mRingTwo, mRingThree, mRingFour, mRingFive]
each object in the array has a different color, In some point in the game I want to change the color of each ring, but I have 2 condition for this to happen:
1. a ring should not have the color it had one iteration before.
2. each ring should be in a different color from the others.
for the first condition I did this:
func changeRingsColor(){
var previousColor: UIColor?
for ring in mRings {
previousColor = ring.fillColor
repeat{
ring.fillColor = hexStringToUIColor(hex: mColors[Int(arc4random_uniform(UInt32(5)))])
}while(ring.fillColor.isEqual(previousColor))
}
}
and it is working, however, I couldn't figure out a way to answer the second condition.
In Java I would probably do something like this:
for (int i=0; i<mRings.length; i++){
for( int j=1; j<mRings.length; j++){
if (ring[i].fillColor == ring[j].fillColor){
generate another color for 'j' ring.
}
}
}
but nothing I tried worked.
Hope you guys can help me, Thanks in advance!
btw, mColors is an array of 5 different colors, from there I pick the colors.
I'm going to ignore some of the implementation details and focus on the core of the question, which is:
Loop through an array
Within each loop, start a new loop at the current index to the end of the array.
Let me know if I'm misunderstanding the above. But I would do it like this:
for (index, ring) in mRings.enumerated() {
let remainingRings = mRings[index+1..<mRings.count]
for otherRing in remainingRings {
print("Now comparing \(ring) to \(otherRing)")
}
}
First, enumerated() gives you both the current ring, and the index, on each iteration of the first for loop. Then, we slice the array from the current index to the end (remainingRings), and loop through those.
It is possible to rewrite Java code in this way :
let mRings = ["mRingOne", "mRingTwo", "mRingThree", "mRingFour", "mRingFive"]
for (index, item) in mRings.enumerated() {
for item in index + 1..<mRings.count {
}
}
Something like this will work:
func changeRingsColor(){
// extract the previous colors
let colors = rings.map { $0.fillColor }
// the order in which the rings will pass color to each other
let passOrder = mRings.indices.shuffled()
for i in mRings.indices {
let previous = i == 0 ? mRings.count - 1 : i - 1
mRings[passOrder[i]].fillColor = colors[passOrder[previous]]
}
}
Using this implementation of shuffled
How does it work?
Instead of randomly choosing a color for each individual ring, I am randomly generating an order in which the rings will swap the colors (passOrder). Since every ring will pass its color to a different ring in that order, you can be sure no color will stay the same.
I'm making a simple game in swift and xcode and I ran into this problem that I can't figure out. Because I have so many levels, the code locks up indexing and slows down the whole program. I get a color wheel spinning for a few minutes but it never crashes. Just takes several minutes everytime I type in a few characters. Strange, but xcode has always had it's bugs right?
Each Button ("button1, button2..." below) gets a single number from "level1:Array". It's like a code that fills in the button's value for the game. There are only 4 buttons, but the numbers should be able to change as they each have their own variables.
I want to generate this for every level. I should be able to generate something like "button1 = level#[0]" where # is replaced by "userLevel". Changing to a string and doing something like "button1 = ("level(userLevel)") as! Array... doesn't seem to work. Look below and use my terminology when giving examples if you can. Thanks!
Here's the example:
let level1:Array = [9,7,4,1] // current puzzle, to go directly into button vars below (button1,button2,ect)
var userLevel = 1 // current user's level
if userLevel == 1 {
print("making Level 1, setting buttons to value from array")
button1 = level1[0]
button2 = level1[1]
button3 = level1[2]
button4 = level1[3]
}
Now, since level# is repeated so often (for each level as the number progresses) I would rather just make it something like this:
//this doesn't work in swift, but what else can I do?
if userLevel > 0 {
button1 = level\(userLevel)[0]
button2 = level\(userLevel)[1]
button3 = level\(userLevel)[2]
button4 = level\(userLevel)[3]
}
Is there an easy way to do this? Thanks!
-GG
Try using a for-in loop. Create an array of the buttons, and then
var index = 0
for button in buttons {
button = level1[index]
index++
}
EDIT since you want both the user level and the level number to increase, I suggest you define the levels like this. (Make sure that the number of buttons is equal to the number of userLevels, otherwise you will have problems)
var array = [1,2,3]
let levels = [1:[1,3,8],2:[3,6,4],3:[4,2,5]]
var index = 0
if array.count == levels.count {
for number in array {
array[index] = levels[index+1]![index]//The second index can be 0 if you want
index++
}
}
//array = [1,6,5]
// You could create a second index to match the number of levels within the main user level.
In this case, assume array to be your array of buttons
EDIT 2 :)
I've made a function that will allow you to assign all the levels to your array for a specific userLevel, since I see that is what you want
let levels = [1:[1,3,8],2:[3,6,4],3:[4,2,5]]
func assignValuesToArray(levelNo:Int) -> [Int] {
var array: [Int] = []
if (levelNo > 0) && (levelNo <= levels.count) {
for (level,levelArray) in levels {
if level == levelNo {
for value in levelArray {
array.append(value)
}
}
}
return array
} else {
print("This Level number does not exist")
return []
}
}
var finalArray = assignValuesToArray(2)
print(finalArray) // Returns [3,6,4]
As you can see from this example, you will return your array of buttons from the function, and you can assign the returned array values to whatever you like.
I got a ton of movieclips in a class. Is there a more efficient way to apply a function to every instance in the class other than this?
var textArray:Array = [
interludes.interludeIntro.interludeBegin1,
interludes.interludeIntro.interludeBegin2,
interludes.interludeIntro.interludeBegin3,
interludes.interludeIntro.interludeBegin4,
interludes.interludeIntro.interludeBegin5,
interludes.interludeIntro.interludeBegin6,
interludes.interludeIntro.interludeBegin7,
//... ... ...
interludes.interludeIntro.interludeBegin15
];
for each (var interludeText:MovieClip in interludeBeginText)
{
interludeText.alpha = 0 //clear all text first
}
Also for some reason this doesn't work:
interludes.interludeIntro.alpha = 0;
It permanently turns that class invisible, even if I try to make specific instances visible later with:
interludes.interludeIntro.interludeBegin1.alpha = 1;
I have NO idea why the above doesn't work. I want to turn every single instance in the class interludeIntro invisible, but I want to turn specific instances visible later.
(btw I have no idea how to insert code on this website, pressing "code" doesn't do anything, so pardon the bad formatting)
I'm not really sure what you're asking, but what may be useful is that, in ActionScript you can refer to properties by name, like myObject["someProperty"].
Using that, you can iterate over properties if they follow some naming scheme, so for example:
for (var i:int = 1; i <= 15; i ++)
interludes.interludeIntro["interludeBegin" + i].alpha = 0;
That iterates over interludes.interludeIntro.interludeBegin1 through ...15 and sets their alpha properties to 0.
When you do that:
interludes.interludeIntro.alpha = 0;
you turn the movie clip and all its children invisible.
So later when you do that:
interludes.interludeIntro.interludeBegin1.alpha = 1;
You make the movie clip visible, but since its parent is still invisible, you don't see anything. The solution is to loop through the movie clips and make each of them invisible/visible.
// Keep the parent visible at all time
interludes.interludeIntro.alpha = 1;
for (var i:int = 0; i < textArray.length; i++) {
textArray[i].alpha = 0;
}
// Now this will work:
interludes.interludeIntro.interludeBegin1.alpha = 1;
I'm writing a game with Flash CS5/AS 3.0 that tries to simulate depth of field by drawing all the relevant Movie Clips based on their Y position in ascending order, i.e. things lower on the stage overlap things higher on the stage. A MovieClip with a Y position of 10 would therefore need to have a lower index compared to a MovieClip with a Y position of 20, so the second one gets drawn on top of the first.
I wrote a quick and dirty function just to test this. During the trace, I've noticed that the truck's index hits 0 when I go near the top of the stage, but if I go too far up it will completely disappear from the stage. Trace then starts generating this error:
ArgumentError: Error #2025: The supplied DisplayObject must be a child of the caller.
at flash.display::DisplayObjectContainer/getChildIndex()
at EICT::Game/ReorganizeDisplayIndexes()
at EICT::Game/loop()
theTruck is a MovieClip of the player controlled vehicle
Enemies, Cones, Rocks are all arrays which contain MovieClips
None of them have event listeners.
private function ReorganizeDisplayIndexes(): void
{
var drawableObjects:Array = new Array();
drawableObjects.push(theTruck);
drawableObjects = drawableObjects.concat(Enemies, Rocks, Bushes);
drawableObjects.sortOn("y", Array.DESCENDING | Array.NUMERIC);
drawableObjects.reverse();
trace(collisionLayer.getChildIndex(theTruck));
for (var a:int = collisionLayer.numChildren - 1; a >= 0; a--)
{
collisionLayer.removeChildAt(a);
}
for (var i:int = 0; i < drawableObjects.length; i++)
{
collisionLayer.addChild(drawableObjects[i]);
}
}
Hint: You don't need to remove the child first. When you use addChild() on an object, it is automatically re-added to the next highest depth.
That said, you'll just need to do something like this:
drawableObjects.sortOn("y");
for each(var i:DisplayObject in drawableObjects)
{
if(i.parent)
i.parent.addChild(i);
}
Use setChildIndex instead of removing and re-adding:
for (var a:int = collisionLayer.numChildren - 1; i >= 0; i--)
{
collisionLayer.setChildIndex(drawableObjects[i], i);
}
Also, it's a bit wasteful to first order the sort in descending and then reversing the array. Sort it ascending to begin with!