Say for example I have 20 buttons. How can I add a subView of the UIView of this button in a circular format?
This will place the buttons around a circle of a given radius at a given center.
It will also rotate each button using the transform property of UIView.
Hope it helps. :)
- (void)viewDidLoad
{
[super viewDidLoad];
NSArray *buttons = /* you buttons here */
float curAngle = 0;
float incAngle = ( 360.0/(buttons.count) )*PI/180.0;
CGPoint circleCenter = CGPointMake(160, 200); /* given center */
float circleRadius = 100; /* given radius */
for (UIButton *button in buttons)
{
CGPoint buttonCenter;
buttonCenter.x = circleCenter.x + cos(curAngle)*circleRadius;
buttonCenter.y = circleCenter.y + sin(curAngle)*circleRadius;
button.transform = CGAffineTransformRotate(button.transform, curAngle);
button.center = buttonCenter;
[self.view addSubview:button];
curAngle += incAngle;
}
}
Result:
Related
Being new to the obj-c language and Sprite kit I'm having difficulties positioning a rectangle in a grid...
There's an offset in the rectangles I create - if I manage to get the code to position a rectangle in a chosen field another rectangle will be offset...
I have tried several different approches and I can get it to work using JavaFX. What am I doing wrong?
The photo below shows my problem clearly.
My code is rather simple and can be seen here:
#import "MyScene.h"
#implementation MyScene
const int ROWS = 10;
-(id)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
/* Setup your scene here */
self.backgroundColor = [SKColor darkGrayColor];
[self createBoardWithRows:ROWS];
[self createBoxPositionX:1 positionY:1];
[self createBoxPositionX:3 positionY:3];
[self createBoxPositionX:5 positionY:5];
}
return self;
}
-(void) createBoardWithRows: (int) rows{
for (int i = 1; i < rows; i++){
//Horisontal lines
int yPos = self.size.height/rows * i;
SKShapeNode *lineH = [SKShapeNode node];
CGMutablePathRef pathToDraw = CGPathCreateMutable();
CGPathMoveToPoint(pathToDraw, NULL, 0, yPos);
CGPathAddLineToPoint(pathToDraw, NULL, self.size.width, yPos);
lineH.path = pathToDraw;
lineH.lineWidth = 1.0;
[lineH setStrokeColor:[UIColor blackColor]];
//Vertical Lines
int xPos = self.size.width/rows * i;
SKShapeNode *lineV = [SKShapeNode node];
CGPathMoveToPoint(pathToDraw, NULL, xPos, 0);
CGPathAddLineToPoint(pathToDraw, NULL, xPos, self.size.height);
lineV.path = pathToDraw;
lineV.lineWidth = 1.0;
[lineV setStrokeColor:[UIColor blackColor]];
//Add lines
[self addChild:lineH];
[self addChild:lineV];
}
}
-(void) createBoxPositionX:(int) fieldIndexX positionY:(int) fieldIndexY{
int width = self.size.width/ROWS;
int height = self.size.height/ROWS;
int x = (width * fieldIndexX);
int y = (height * fieldIndexY);
CGRect box = CGRectMake(x, y, width, height);
SKShapeNode *shapeNode = [[SKShapeNode alloc] init];
shapeNode.path = [UIBezierPath bezierPathWithRect:box].CGPath;
shapeNode.fillColor = SKColor.yellowColor;
//Stroke settings
shapeNode.strokeColor = [SKColor clearColor];
shapeNode.lineWidth = 0;
[self addChild:shapeNode];
//Alternative rectangle
//SKSpriteNode spriteNodeWithColor:CGSize:
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
/* Called when a touch begins */
}
-(void)update:(CFTimeInterval)currentTime {
/* Called before each frame is rendered */
}
#end
It almost seems like you're not taking into account the line width of the border in each box - so when you create the yellow boxes they are displaced by the number of points equivalent to the number of "borders".
To fix this, change these two lines:
int x = (width * fieldIndexX);
int y = (height * fieldIndexY);
to:
int x = (width * fieldIndexX) + fieldIndexX;
int y = (height * fieldIndexY) + fieldIndexY;
If you are getting 1 pixel shifts into any direction it might be anchor point issue.
By default it is 0.5,0.5 - at center of the sprite.
So if your sprite has even length for example 4, the middle can fall on either 2 or 3 and you will get 1 pixel off positioning.
The fix for this is clear, set the anchor point of node to 0,0, like so:
node.anchorPoint = CGPointMake(0,0);
What this does is that the sprite is pinned to it parent with lower left corner instead of center. Since the lower left corner always starts at 0,0 pixel you will have correct positions regardless of pixel count of your nodes.
But you will have to adjust the nodes position to accomodate this change.
Hope this helps.
I am doing a project in which i need two imageviews in single Scrollview with zooming options. UIScrollView allows one view to make zoom easily. But my problem is not like that. I have two imageviews side by side in the scroll view.When I try to zoom the images its not working Is there is any option to zoom two image views at the same time.Please suggest me some idea.
Thanks in advance
Here is code for Zooming two images in single scrollview
I have added two UIImageView's in One UIView and then I have added the UIView to UIScrollView. Following is my code :
- (void)viewDidLoad {
[super viewDidLoad];
self.vwImages = [[UIView alloc]initWithFrame:CGRectMake(0, 0,100,200)];
// 1
UIImage *image = [UIImage imageNamed:#"imgBaskteBall2.jpeg"];
UIImageView *imageView1 = [[UIImageView alloc] initWithImage:image];
imageView1.frame = CGRectMake(0,0,100,100);
[self.vwImages addSubview:imageView1];
UIImage *image2 = [UIImage imageNamed:#"imgBaskteBall1.jpeg"];
UIImageView *imageView2 = [[UIImageView alloc] initWithImage:image2];
imageView2.frame = CGRectMake(0, 100, 100, 100);
[self.vwImages addSubview:imageView2];
// 2
[self.scrollView addSubview:self.vwImages];
self.scrollView.contentSize = self.vwImages.frame.size;
// 3
UITapGestureRecognizer *doubleTapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(scrollViewDoubleTapped:)];
doubleTapRecognizer.numberOfTapsRequired = 2;
doubleTapRecognizer.numberOfTouchesRequired = 1;
[self.scrollView addGestureRecognizer:doubleTapRecognizer];
UITapGestureRecognizer *twoFingerTapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(scrollViewTwoFingerTapped:)];
twoFingerTapRecognizer.numberOfTapsRequired = 1;
twoFingerTapRecognizer.numberOfTouchesRequired = 2;
[self.scrollView addGestureRecognizer:twoFingerTapRecognizer];
}
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
// 4
CGRect scrollViewFrame = self.scrollView.frame;
CGFloat scaleWidth = scrollViewFrame.size.width / self.scrollView.contentSize.width;
CGFloat scaleHeight = scrollViewFrame.size.height / self.scrollView.contentSize.height;
CGFloat minScale = MIN(scaleWidth, scaleHeight);
self.scrollView.minimumZoomScale = minScale;
// 5
self.scrollView.maximumZoomScale = 10.0f;
self.scrollView.zoomScale = minScale;
// 6
[self centerScrollViewContents];
}
- (void)centerScrollViewContents {
CGSize boundsSize = self.scrollView.bounds.size;
CGRect contentsFrame = self.vwImages.frame;
if (contentsFrame.size.width < boundsSize.width) {
contentsFrame.origin.x = (boundsSize.width - contentsFrame.size.width) / 2.0f;
} else {
contentsFrame.origin.x = 0.0f;
}
if (contentsFrame.size.height < boundsSize.height) {
contentsFrame.origin.y = (boundsSize.height - contentsFrame.size.height) / 2.0f;
} else {
contentsFrame.origin.y = 0.0f;
}
self.vwImages.frame = contentsFrame;
}
- (void)scrollViewDoubleTapped:(UITapGestureRecognizer*)recognizer {
// 1
CGPoint pointInView = [recognizer locationInView:self.imageView];
// 2
CGFloat newZoomScale = self.scrollView.zoomScale * 1.5f;
newZoomScale = MIN(newZoomScale, self.scrollView.maximumZoomScale);
// 3
CGSize scrollViewSize = self.scrollView.bounds.size;
CGFloat w = scrollViewSize.width / newZoomScale;
CGFloat h = scrollViewSize.height / newZoomScale;
CGFloat x = pointInView.x - (w / 2.0f);
CGFloat y = pointInView.y - (h / 2.0f);
CGRect rectToZoomTo = CGRectMake(x, y, w, h);
// 4
[self.scrollView zoomToRect:rectToZoomTo animated:YES];
}
- (void)scrollViewTwoFingerTapped:(UITapGestureRecognizer*)recognizer {
// Zoom out slightly, capping at the minimum zoom scale specified by the scroll view
CGFloat newZoomScale = self.scrollView.zoomScale / 1.5f;
newZoomScale = MAX(newZoomScale, self.scrollView.minimumZoomScale);
[self.scrollView setZoomScale:newZoomScale animated:YES];
}
- (UIView*)viewForZoomingInScrollView:(UIScrollView *)scrollView {
// Return the view that you want to zoom
return self.vwImages;
}
- (void)scrollViewDidZoom:(UIScrollView *)scrollView {
// The scroll view has zoomed, so you need to re-center the contents
[self centerScrollViewContents];
}
Make object of UIView as container for example viewContainer
[viewContainer addSubView:imageView1];
[viewContainer addSubView:imageView2];
[scrollView addSubView:viewContainer];
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return viewContainer;
}
Add
You can use this
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return [self.scrollView.subviews objectAtIndex:0];
}
the viewForZoomingInScrollView delegate method return the object at Index 0.
From Properly zooming a UIScrollView that contains many subviews
add both the imageView in the view and replace this method
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return view;
}
I want to drag resizable UIView from its corner?
Like on desktop we Click the mouse button and hold on click and drag the mouse then a transparent view is visible like this.
I want this in my Project in iPhone. I want when the user touch and drag the finger one resizable transparent view will visible.
I have done so far on click on button the view is visible and that is resizable also. But it is not my solution, I want on touch on any iphone screen the resizable UIView will come.
Any Idea and suggestions would be highly welcome.
This is my code what I have done so far:
- (void)viewDidLoad
{
tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTap:)];
tap.numberOfTapsRequired = 1;
[imageVw addGestureRecognizer:tap];
tap.delegate=self;
pan=[[UIPanGestureRecognizer alloc]initWithTarget:self action:#selector(panAction:)];
[pan setMinimumNumberOfTouches:1];
[pan setMaximumNumberOfTouches:2];
[pan setDelegate:self];
count=0;
// [pan minimumNumberOfTouches:1];
// [pan maximumNumberOfTouches:2];
[imageVw addGestureRecognizer:pan];
}
-(void)handleTap:(UIPanGestureRecognizer *)gestureRecognizer
{
userResizableView = [[SPUserResizableView alloc] init];
userResizableView.frame = CGRectMake(x,y,w,h);
//UIView *content_View = [[UIView alloc] initWithFrame:userResizableView.bounds];
//[content_View setBackgroundColor:[UIColor whiteColor]];
imageVw1 = [[UIImageView alloc]initWithFrame:userResizableView.bounds];
//imageVw1.image = [UIImage imageNamed:#"redacted2.jpg"];
imageVw1.backgroundColor = [UIColor blackColor];
imageVw1.userInteractionEnabled=YES;
imageVw1.autoresizesSubviews = YES;
imageVw1.alpha = 0.13; // for opacity
userResizableView.contentView = imageVw1;
//[content_View addSubview:imageVw1];
//userResizableView.contentView = content_View;
userResizableView.delegate = self;
[userResizableView showEditingHandles];
currentlyEditingView = userResizableView;
lastEditedView = userResizableView;
// [self.view addSubview:userResizableView];
// [imageVw addSubview: dview];
[self.view addSubview: userResizableView];
[userResizableView release];
}
- (void)userResizableViewDidBeginEditing:(SPUserResizableView *)userResizableView1 {
width = userResizableView.frame.size.width;
height = userResizableView.frame.size.height;
width1 = width;
height1 = height;
width = width + width;
height = height + height;
[currentlyEditingView hideEditingHandles];
currentlyEditingView = userResizableView1;
}
- (void)userResizableViewDidEndEditing:(SPUserResizableView *)userResizableView1 {
lastEditedView = userResizableView1;
x1 = x;
y1 = y;
x = userResizableView.frame.origin.x;
y = userResizableView.frame.origin.y;
}
First you have to declare two global variables
CGPoint startPoint;
BOOL _shouldResize;
Then you have to override two touch event methods in your view as given
1.TouchesBegan
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
CGPoint touchPoint = [[touches anyObject] locationInView:[self superview]];
/*
Here you have to check user tap to the corner of your view by using the method
CGRectContainsPoint(CGRect rect, touchPoint);
Here the parameter rect should be the corner of your view
if(!CGRectContainsPoint(CGRect rect, touchPoint)) { // Here user did not tap in your specific rect. so no need of resizing
_shouldResize = NO;
return;
}
*/
_shouldResize = YES;
startPoint = touchPoint;
}
2.TouchesMoved
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
if(!_shouldResize)
return;
CGPoint touchPoint = [[touches anyObject] locationInView:[self superview]];
CGFloat displacementX = touchPoint.x - startPoint.x;
CGFloat displacementY = touchPoint.y - startPoint.y;
startPoint.x = touchPoint.x;
startPoint.y = touchPoint.y;
CGRect frame = [self frame];
frame.size.width += displacementX;
frame.size.height += displacementY;
[self setFrame:frame];
}
Hope this will help you :)
How do you make a menu like in Cut the Rope game. Image below:
I am able to make three images slide horizontally but failed to make it as a button.
Though I don't need it to be fancy as the game's, but just a simple button.
Do I need to stack three different Views with its respective buttons inside UIScrollView? I am leaning towards doing it programmatically though.
Code: http://pastebin.com/ikrJ1U7w
Its actually a UIScrollView which containing UIButton of custom type & has image on that. Below that is UIPageIndicator.
You can create it as below, althouh also search for
How to create UIButton programatically to add on scrollview
In your view controller,
In viewDidLoad, in scrollView add the buttons.
UIScrollView *scrollView = // initalize & set frame as per ur req
scrollView.userInteractionEnabled = YES;
scrollView.pagingEnabled = YES;
float x = 0.0;
float y = 0.0, width = 320.0;
float height;
for (int j = 0; j <= numberofpagesYouwant; j++)
{
CGRect frame;
UIButton *button = // Create a button at here;
frame = CGRectMake(x, y, width, height); // Use this as your button frame
[scrollView addSubview:button];
[button release];
x = x + width;
}
scrollView.contentSize = CGSizeMake(numberOfPagesYouHave * 320, heightOfYourScrollView);
}
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
CGFloat pageWidth = self.scrollView.frame.size.width;
int page = floor((self.scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
if(page != activityIndicator.currentPage)
{
NSLog(#"now page change:%d",page);
[self changePageIndicator:page];
}
}
-(void)changePageIndicator:(int)index
{
activityIndicator.currentPage = index;
}
- (void)setNumberOfPages:(int)numPages1
{
activityIndicator.numberOfPages = numPages1;
}
Yes, I am pretty sure this is just several buttons placed on top of some sort of a scrollView. (most likely done programatically).
I need to create Arch shaped UIButtons, on a circle image.(the O/p need to look like Concentric Circles),
At present I am using 5 images, but in future I may add some more Images, Dynamically I need to fil the circle Image with the added images.
I had a sample Piece of code and O/P is the below image
int numberOfSections = 6;
CGFloat angleSize = 2*M_PI/numberOfSections;
for (int j = 0; j < numberOfSections; ++j) {
UIButton *sectionLabel = [[UIButton alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 150.0f, 2.0f)];
sectionLabel.backgroundColor = [UIColor redColor];
sectionLabel.layer.anchorPoint = CGPointMake(1.0f, 0.5f);
sectionLabel.layer.position = CGPointMake(container.bounds.size.width/2.0, container.bounds.size.height/2.0); // places anchorPoint of each label directly in the center of the circle.
sectionLabel.transform = CGAffineTransformMakeRotation(angleSize*j);
[container addSubview:sectionLabel];
}
I have tried with this piece of code and the O/P is the below image
int numberOfSections = 5;
CGFloat angleSize = 2*M_PI/numberOfSections;
for (int j = 0; j<numberOfSections; ++j) {
UIImage *imageframe = [imagesArray objectAtIndex:j];
OBShapedButton *button = [[OBShapedButton alloc] initWithFrame:CGRectMake(0.0f, 150.0f, 150.0f, 128.0f)];
button.transform = CGAffineTransformMakeRotation(angleSize*j);
[container addSubview:button];
}
I need my output as the below image
How can i Achieve that
O/P after I Tried with Sarah Zuo's code
same width and height buttons
AnyKind of Help is more Appreciated
I can answer only last part,
If you are able to get images for buttons, then you can refer this tutorial. This might help you. Provided, your image formed is having transparent background.
float radius = container.bounds.size.width / 2;
int numberOfSections = 5;
CGFloat angleSize = 2*M_PI/numberOfSections;
for (int j = 0; j<numberOfSections; ++j) {
UIImage *imageframe = [imagesArray objectAtIndex:j];
OBShapedButton *button = [[OBShapedButton alloc] initWithFrame:CGRectMake(0.0f, 150.0f, 150.0f, 128.0f)];
button.transform = CGAffineTransformMakeRotation(2*M_PI-angleSize*j);
button.center = CGPointMake(radius + radius * sin(angleSize * j) / 2, radius + radius * cos(angleSize * j) / 2);
[container addSubview:button];
}
Try this code.
You can use your UIImageView instead. You can give different tag to image view and add Gesture Recognizer. Now you can get touch events like button click event on image views.
If all buttons' image look like the one (same direction), the transform value may be work.
button.transform = CGAffineTransformMakeRotation(2*M_PI-angleSize*j);
button.center = CGPointMake(radius + radius * sin(angleSize * j) / 2, radius + radius * cos(angleSize * j) / 2);