Currently I am displaying a list of items to choose from, the scrollview scrolls to the bottom, however, it goes 'under' the GUI/Banner, whereas I would prefer the scrollview to stop displaying beyond that point - the user should still be able to keep scrolling but the scrollview should not overlap the bottom if that makes sense?
At the moment the scrollview takes up the whole screen.
- (void)reloadScroll
{
for(UIView *view in [scroll subviews])
[view removeFromSuperview];
scroll.contentSize = CGSizeMake(scroll.frame.size.width, 1760);
for(int i = 0; i < 20; i++)
{
int xCoord = 0;
if(i % 2 == 0)
xCoord = 57;
else
xCoord = 188;
UIButton *glasss = [[UIButton alloc] initWithFrame:CGRectMake(xCoord, 20 + i/2 * 150 + i/2 * 20, 75, 150)];
if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
{
int xCoord = 0;
if(i % 2 == 0)
xCoord = 156;
else
xCoord = 462;
glasss.frame = CGRectMake(xCoord, 20 + i/2 * 300 + i/2 * 20, 150, 300);
scroll.contentSize = CGSizeMake(scroll.frame.size.width, 3240);
}
}
Related
I newbie in Obj-C.
I have the following chess field:
for (int row = 0; row < 8; row++) {
for (int column = 0; column < 8; column++) {
CGRect square = {horizontalOffSet + (column * squareSize),
verticalOffSet + (row * squareSize),
squareSize, squareSize};
UIView *rect = [[UIView alloc] initWithFrame:square];
rect.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin;
horizontalOffSet = horizontalOffSet + squareSize;
if ((row + column) % 2 == 0) {
//verticalOffSet = verticalOffSet + squareSize;
horizontalOffSet = 0;
rect.backgroundColor = [UIColor whiteColor];
[anotherRect addSubview:rect];
} else {
//verticalOffSet = verticalOffSet + squareSize;
horizontalOffSet = 0;
rect.backgroundColor = [UIColor blackColor];
[anotherRect addSubview:rect];
}
}
}
My task to change colours of the field when it rotates, for example, fill it with cyan and purple colour when rotating on left. Not clearly understand how to do it.
#somerk check my updated code:
1) I have give identifier(tag) to identified chess view and which has white and which has black color. you can do it without identifier but in case of multiple subviews identifier is better way to get.
int horizontalOffSet = 2;
int squareSize = 40;
int verticalOffSet = 2;
for (int row = 0; row < 8; row++) {
for (int column = 0; column < 8; column++) {
CGRect square = {horizontalOffSet + (column * squareSize),
verticalOffSet + (row * squareSize),
squareSize, squareSize};
UIView *rect = [[UIView alloc] initWithFrame:square];
rect.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin;
horizontalOffSet = horizontalOffSet + squareSize;
if ((row + column) % 2 == 0) {
//verticalOffSet = verticalOffSet + squareSize;
horizontalOffSet = 0;
rect.tag = 101;
rect.backgroundColor = [UIColor whiteColor];
[self.view addSubview:rect];
} else {
//verticalOffSet = verticalOffSet + squareSize;
rect.tag = 102;
horizontalOffSet = 0;
rect.backgroundColor = [UIColor blackColor];
[self.view addSubview:rect];
}
}
2) I have performed color change event on UIButton click so you have to use that code after rotation event.
-(IBAction)changeColor:(UIButton *)btn{
for(UIView *rectViews in self.view.subviews){
UIColor *clrblck = [UIColor blackColor];
if(rectViews.backgroundColor == clrblck && rectViews.tag == 102){
rectViews.backgroundColor = [UIColor cyanColor];
}else if(rectViews.backgroundColor == clrblck && rectViews.tag == 101){
rectViews.backgroundColor = [UIColor purpleColor];
}else{
// you will get other views here..
}
}
}
I have get all subviews and check backgroundColor and tag and change its backgroundColor.
Note: change view'name according your view's name in loop and where you add rect as subviews in your anotherRect.
Free to ask me if you have any question. Happy Coding :)
Find another possible solution to change colors:
-(void) viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
[super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
CGFloat rndmColor1 = (float)(arc4random() % 256) / 255;
CGFloat rndmColor2 = (float)(arc4random() % 256) / 255;
for(UIView *rect in self.chessField.subviews){
if (rect.tag == 102) {
rect.backgroundColor = [UIColor colorWithHue:rndmColor1 saturation:1 brightness:1 alpha:1];
} else if (rect.tag == 101) {
rect.backgroundColor = [UIColor colorWithHue:rndmColor2 saturation:1 brightness:1 alpha:1];
}
}
}
I have three UIButtons and a holder UIView I want all my three UIButton to be vertically centred inside the UIView and also I want them to be distributed equal horizontally
float ycentre = CGRectGetMidY(self.buttonHolderView.bounds);
float xposition = (self.buttonHolderView.frame.size.width - 135.0f)/4.0f;
self.button1 = [[UIButton alloc]initWithFrame:CGRectMake(xposition,0, 45, 30)];
self.button1.center = CGPointMake(self.button1.frame.origin.x, ycentre);
self.button2 = [[UIButton alloc]initWithFrame:CGRectMake((xposition*2)+45,0, 45, 30)];
self.button2.center = CGPointMake(self.button2.frame.origin.x, ycentre);
self.button3 = [[UIButton alloc]initWithFrame:CGRectMake((xposition*3)+90,0, 45, 30)];
self.button3.center = CGPointMake(self.button3.frame.origin.x, ycentre);
[self.button3 addTarget:self action:#selector(ShareButtonClicked) forControlEvents:UIControlEventTouchUpInside];
[self.buttonHolderView addSubview:self.button1];
[self.buttonHolderView addSubview:self.button2];
[self.buttonHolderView addSubview:self.button3];
Each button has height 30 and width 45 , but my code doesn't distribute them equally what is wrong?
Place them in a UIStackView. It makes spacing views evenly quite easy.
Set the frame of your buttons as follows and do Not set center
float thirdOfWidth = (self.buttonHolderView.frame.width/3.0);
float buttonWidth = 45.0;
float buttonHeight = 30.0;
self.button1 = [[UIButton alloc]initWithFrame:CGRectMake(thirdOfWidth*0 + (thirdOfWidth - buttonWidth)/2, (self.buttonHolderView.frame.height - buttonHeight)/2, 45, 30)];
self.button2 = [[UIButton alloc]initWithFrame:CGRectMake(thirdOfWidth*1 + (thirdOfWidth - buttonWidth)/2, (self.buttonHolderView.frame.height - buttonHeight)/2, 45, 30)];
self.button3 = [[UIButton alloc]initWithFrame:CGRectMake(thirdOfWidth*2 + (thirdOfWidth - buttonWidth)/2, (self.buttonHolderView.frame.height - buttonHeight)/2, 45, 30)];
It can be done also in loop with arbitrary count of buttons
NSInteger count = 3;
CGFloat buttonWidth = 45;
CGFloat buttonHeight = 30;
CGFloat x = (self.bounds.size.width - buttonWidth) / 2;
CGFloat verticalSpacing = ((self.bounds.size.height - buttonHeight * count) / count) - buttonHeight / 2;
CGFloat y = verticalSpacing;
for (int i = 0; i < count; i++) {
UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(x, y, buttonWidth, buttonHeight)];
[self addSubview:button];
y += buttonHeight + verticalSpacing;
}
What would be the best way on iOS to achieve drawing a grid of circles with fixed columns and rows ?. I would want to identify each circle when the user taps on it.
I tried using collection views but it seems CoreGraphics is meant for tasks like these.
You can create buttons dynamically as follows :
- (void)drawSheet
{
int numberOfRow=5;
int numberOfColumn=4;
float x = 1,
y = 20,
padding = 5,
width = (self.view.frame.size.width-(padding*(numberOfColumn-1)))/numberOfColumn,
height = (self.view.frame.size.height-(padding*(numberOfRow-1)))/numberOfRow;
int counter = 0;
for (int i=0; i<numberOfRow; i++) {
for (int j=0; j<numberOfColumn; j++) {
UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(x, y, 74, 74)];
btn.layer.cornerRadius = btn.frame.size.width/2;
btn.layer.borderColor = [UIColor grayColor].CGColor;
btn.layer.borderWidth = 2.0;
[btn addTarget:self action:#selector(buttonPress:) forControlEvents:UIControlEventTouchUpInside];
btn.clipsToBounds = YES;
btn.tag = counter;
[self.view addSubview:btn];
x = x + width + padding;
counter = counter + 1;
}
x = 0;
y = y + height + padding;
}
}
When you tap on it, you will get tag of it :
- (IBAction)buttonPress:(UIButton *)sender{
NSLog(#"%ld",sender.tag);
}
hi Please check the below code. i have added 3 circles in a row, you could use more if you want.
- (void)viewDidLoad {
[super viewDidLoad];
UIView *circleView;
int x = 10;
int y = 20;
static int tagNum = 0;
for (int row=0; row < 5;) {
for (int cirNum =0 ; cirNum <3;) {
circleView = [[UIView alloc] initWithFrame:CGRectMake(x,y,100,100)];
circleView.alpha = 0.5;
circleView.layer.cornerRadius = 50;
circleView.backgroundColor = [UIColor blueColor];
circleView.tag = tagNum;
NSLog(#"tagNum is %d", tagNum);
[self.view addSubview:circleView];
cirNum ++;
x = x + 100;
tagNum ++;
//y = y + 20;
}
row++;
y = y + 100;
x = 10;
}
// Do any additional setup after loading the view, typically from a nib.
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
CGPoint location = [[touches anyObject] locationInView:self.view];
CGRect fingerRect = CGRectMake(location.x-5, location.y-5, 10, 10);
for(UIView *view in self.view.subviews){
CGRect subviewFrame = view.frame;
if(CGRectIntersectsRect(fingerRect, subviewFrame)){
//we found the finally touched view
//NSLog(#"Yeah !, i found it %#",view);
NSLog(#"view tag touched is %ld",view.tag);
}
}
}
output would look like this
Hi I am able to see my UIScrollView offset the first time but I would like it to be constantly updating and checking the offset as the user scrolls from left to right.
Here is what I have.
My UIScrollView
int PageCount = 2;
NSMutableArray *myArray =[[NSMutableArray alloc]initWithObjects:#"12-4.png", #"13-4.png", nil];
scroller = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
scroller.scrollEnabled = YES;
scroller.backgroundColor = [UIColor clearColor];
scroller.pagingEnabled = YES;
[self.view addSubview:scroller];
width = scroller.frame.size.width;
xPos = 0;
for (int i = 0; i < PageCount; i++)
{
ImgView = [[UIImageView alloc]initWithFrame:CGRectMake(xPos, 0, scroller.frame.size.width, scroller.frame.size.height)];
[ImgView setImage:[UIImage imageNamed:[myArray objectAtIndex:i]]];
[scroller addSubview:ImgView];
scroller.contentSize = CGSizeMake(width, 0);
width += scroller.frame.size.width;
xPos += scroller.frame.size.width;
}
And then the offset
if (scroller.contentOffset.x >= 0 && scroller.contentOffset.x <= 320)
{
NSLog(#"Offset %f", scroller.contentOffset.x);
}
And that returns 0.I would like to constantly update and check the offset.
I have tried [scroller needsDisplay] and [scroller needsLayout]
Any help would be really appreciated.Thank you.
You need to learn the basics of C:
if (scroller.contentOffset.x >= 0 && scroller.contentOffset.x <= 320)
This assumes you want to see if the x offset is between 0 and 320 (inclusive).
To check the offset as the scroll view is scrolled, implement the scrollViewDidScroll: delegate method:
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
if (scrollView.contentOffset.x >= 0 && scrollView.contentOffset.x <= 320) {
NSLog(#"Offset %f", scroller.contentOffset.x);
} else if (...) {
}
}
And of course you need to see the scroll view's delegate property.
I want to create 15 UIButtons progaramatically using for loop. I want to arrange buttons like matrix with rows and colums, say 3 rows and 5 columns. The buttons height is 50 and width is 80. I can set y,width,height coordinates. But I face problem only with x coordinate. Tell me the logic for setting x coordinate.
Thanks in advance.
float x = 10;
float y = 10;
float width = 50;
float height = 50;
for(int i =0;i<15;i++)
{
UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[btn setFrame:CGRectMake(x, y, width, height)];
[btn setTitle:[NSString stringWithFormat:#"B%d",i+1] forState:UIControlStateNormal];
[self.view addSubview:btn];
x = x + width + 20;
if((i+1)%3==0)
{
x = 10;
y = y + height + 20;
}
}
Just replace x and y and also set height and width in above code.
int row = 0;
int column = 0;
for (int i = 0; i < 15; i++)
{
if((row%3 == 0) && (row > 0))
{
row = 0;
column++;
}
else{
row++;
}
CGRect btnFrame = CGRectMake(row*80+10, column*50+10, 80, 50);//your button frame
UIButton *btnTemp = [UIButton buttonWithType:UIButtonTypeCustom];
[btnTemp setFrame:btnFrame];
[self.view addSubView:btnTemp];
}
Here you go:
CGFloat marginX = 10.f;
CGFloat marginY = 5.f;
CGRect buttonFrame = CGRectMake(0., 0., 80., 50.f);
for(NSUInteger row = 0; row < 5; row++) {
for(NSUInteger column = 0; column < 3; column++) {
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = buttonFrame;
//... more button settings
[self.view addSubview:button];
buttonFrame.origin.x += marginX;
}
buttonFrame.origin.x = 0.;
buttonFrame.origin.y += marginY;
}