flash animation
I set a CalendarViewController's view as menuitem.view, when touch the bottom of menuitem.view, menuitem.view will begin animate, but i found the animation appears flashing. What can i do that make the animation become more smooth.
- (IBAction)respondToTapBottomView:(NSButton *)sender {
NSSize size = self.view.frame.size;
NSLog(#"%#", NSStringFromRect(self.view.window.frame));
[NSAnimationContext runAnimationGroup:^(NSAnimationContext * _Nonnull context) {
context.duration = 0.5;
CGFloat height = 10;
if (self.bottomContentHeightConstraint.constant >= 30) {
height = 10;
} else {
height = 97;
}
CGFloat windowHeight = self.calendarView.frame.size.height + height;
self.view.animator.frame = CGRectMake(0, 0, size.width, windowHeight);
self.bottomContentHeightConstraint.animator.constant = height;
} completionHandler:^{
NSLog(#"%#", NSStringFromRect(self.view.window.frame));
}];
}
I gave up using this method, finaly, i work around the problem by draw a custom popoverView rather than use menuItem.view.
I have a navigation bar that I've manually coded to animate the frame of depending on the offset of the scrollView (tableView). Below is a screenshot of what it looks like unscrolled.
Now after setScrollOffset:(0,0) is invoked (by scrollsToTop, not me manually - e.g. by tapping status bar), the scrollview scrolls to the top, but at the position at which there used to be no navigation bar. I can manually scroll the last 44px or so after the animation happens, but obviously thats not the behavior that's expected.
Here is my code for hiding the navbar:
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGRect frame = self.navigationController.navigationBar.frame;
CGFloat size = frame.size.height - kMacro1;
CGFloat framePercentageHidden = ((kMacro2 - frame.origin.y) / (frame.size.height - 1));
CGFloat scrollOffset = scrollView.contentOffset.y;
CGFloat scrollDiff = scrollOffset - self.previousScrollViewYOffset;
CGFloat scrollHeight = scrollView.frame.size.height;
CGFloat scrollContentSizeHeight = scrollView.contentSize.height + scrollView.contentInset.bottom;
if (scrollOffset <= -scrollView.contentInset.top) {
frame.origin.y = kMacro2;
} else if ((scrollOffset + scrollHeight) >= scrollContentSizeHeight) {
frame.origin.y = -size;
} else {
frame.origin.y = MIN(kMacro2, MAX(-size, frame.origin.y - scrollDiff));
}
[self.navigationController.navigationBar setFrame:frame];
[self updateBarButtonItems:(1 - framePercentageHidden)];
self.previousScrollViewYOffset = scrollOffset;
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
[self stoppedScrolling];
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView
willDecelerate:(BOOL)decelerate
{
if (!decelerate) {
[self stoppedScrolling];
}
}
- (void)stoppedScrolling
{
CGRect frame = self.navigationController.navigationBar.frame;
if (frame.origin.y < kMacro2) {
[self animateNavBarTo:-(frame.size.height - kMacro1)];
}
}
- (void)animateNavBarTo:(CGFloat)y
{
[UIView animateWithDuration:0.2 animations:^{
CGRect frame = self.navigationController.navigationBar.frame;
CGFloat alpha = (frame.origin.y >= y ? 0 : 1);
frame.origin.y = y;
[self.navigationController.navigationBar setFrame:frame];
[self updateBarButtonItems:alpha];
}];
}
I'm working on an app with 9 views on screen, and I want the users to connect the views in a way they want, and record their sequence as password.
But I don't know which gesture recognizer I should use.
Should I use CMUnistrokeGestureRecognizer or combination of several swipe gesture or anything else?
Thanks.
You could use a UIPanGestureRecognizer, something like:
CGFloat const kMargin = 10;
- (void)viewDidLoad
{
[super viewDidLoad];
// create a container view that all of our subviews for which we want to detect touches are:
CGFloat containerWidth = fmin(self.view.bounds.size.width, self.view.bounds.size.height) - kMargin * 2.0;
UIView *container = [[UIView alloc] initWithFrame:CGRectMake(kMargin, kMargin, containerWidth, containerWidth)];
container.backgroundColor = [UIColor darkGrayColor];
[self.view addSubview:container];
// now create all of the subviews, specifying a tag for each; and
CGFloat cellWidth = (containerWidth - (4.0 * kMargin)) / 3.0;
for (NSInteger column = 0; column < 3; column++)
{
for (NSInteger row = 0; row < 3; row++)
{
UIView *cell = [[UIView alloc] initWithFrame:CGRectMake(kMargin + column * (cellWidth + kMargin),
kMargin + row * (cellWidth + kMargin),
cellWidth, cellWidth)];
cell.tag = row * 3 + column;
cell.backgroundColor = [UIColor lightGrayColor];
[container addSubview:cell];
}
}
// finally, create the gesture recognizer
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self
action:#selector(handlePan:)];
[container addGestureRecognizer:pan];
}
- (void)handlePan:(UIPanGestureRecognizer *)gesture
{
static NSMutableArray *gesturedSubviews;
// if we're starting a gesture, initialize our list of subviews that we've gone over
if (gesture.state == UIGestureRecognizerStateBegan)
{
gesturedSubviews = [NSMutableArray array];
}
// now figure out whether:
// (a) are we over a subview; and
// (b) is this a different subview than we last were over
CGPoint location = [gesture locationInView:gesture.view];
for (UIView *subview in gesture.view.subviews)
{
if (CGRectContainsPoint(subview.frame, location))
{
if (subview != [gesturedSubviews lastObject])
{
[gesturedSubviews addObject:subview];
// an example of the sort of graphical flourish to give the
// some visual cue that their going over the subview in question
// was recognized
[UIView animateWithDuration:0.25
delay:0.0
options:UIViewAnimationOptionAutoreverse
animations:^{
subview.alpha = 0.5;
}
completion:^(BOOL finished){
subview.alpha = 1.0;
}];
}
}
}
// finally, when done, let's just log the subviews
// you would do whatever you would want here
if (gesture.state == UIGestureRecognizerStateEnded)
{
NSLog(#"We went over:");
for (UIView *subview in gesturedSubviews)
{
NSLog(#" %d", subview.tag);
}
// you might as well clean up your static variable when you're done
gesturedSubviews = nil;
}
}
Obviously, you would create your subviews any way you want, and keep track of them any way you want, but the idea is to have subviews with unique tag numbers, and the gesture recognizer would just see which order you go over them in a single gesture.
Even if I didn't capture precisely what you want, it at least shows you how you can use a pan gesture recognizer to track the movement of your finger from one subview to another.
Update:
If you wanted to draw a path on the screen as the user is signing in, you could create a CAShapeLayer with a UIBezierPath. I'll demonstrate that below, but as a caveat, I feel compelled to point out that this might not be a great security feature: Usually with password entry, you'll show the user enough so that they can confirm that they're doing what they want, but not enough so that someone can glance look over their shoulder and see what the whole password was. When entering a text password, usually iOS momentarily shows you the last key you hit, but quickly turns that into an asterisk so that, at no point, can you see the whole password. Hence my initial suggestion.
But if you really have your heart set on showing the user the path as they draw it, you could use something like the following. First, this requires Quartz 2D. Thus add the QuartzCore.framework to your project (see Linking to a Library or Framework). Second, import the QuartCore headers:
#import <QuartzCore/QuartzCore.h>
Third, replace the pan handler with something like:
- (void)handlePan:(UIPanGestureRecognizer *)gesture
{
static NSMutableArray *gesturedSubviews;
static UIBezierPath *path = nil;
static CAShapeLayer *shapeLayer = nil;
// if we're starting a gesture, initialize our list of subviews that we've gone over
if (gesture.state == UIGestureRecognizerStateBegan)
{
gesturedSubviews = [NSMutableArray array];
}
// now figure out whether:
// (a) are we over a subview; and
// (b) is this a different subview than we last were over
CGPoint location = [gesture locationInView:gesture.view];
for (UIView *subview in gesture.view.subviews)
{
if (!path)
{
// if the path hasn't be started, initialize it and the shape layer
path = [UIBezierPath bezierPath];
[path moveToPoint:location];
shapeLayer = [[CAShapeLayer alloc] init];
shapeLayer.strokeColor = [UIColor redColor].CGColor;
shapeLayer.fillColor = [UIColor clearColor].CGColor;
shapeLayer.lineWidth = 2.0;
[gesture.view.layer addSublayer:shapeLayer];
}
else
{
// otherwise add this point to the layer's path
[path addLineToPoint:location];
shapeLayer.path = path.CGPath;
}
if (CGRectContainsPoint(subview.frame, location))
{
if (subview != [gesturedSubviews lastObject])
{
[gesturedSubviews addObject:subview];
[UIView animateWithDuration:0.25
delay:0.0
options:UIViewAnimationOptionAutoreverse
animations:^{
subview.alpha = 0.5;
}
completion:^(BOOL finished){
subview.alpha = 1.0;
}];
}
}
}
// finally, when done, let's just log the subviews
// you would do whatever you would want here
if (gesture.state == UIGestureRecognizerStateEnded)
{
// assuming the tags are numbers between 0 and 9 (inclusive), we can build the password here
NSMutableString *password = [NSMutableString string];
for (UIView *subview in gesturedSubviews)
[password appendFormat:#"%c", subview.tag + 48];
NSLog(#"Password = %#", password);
// clean up our array of gesturedSubviews
gesturedSubviews = nil;
// clean up the drawing of the path on the screen the user drew
[shapeLayer removeFromSuperlayer];
shapeLayer = nil;
path = nil;
}
}
That yields a path that the user draws as the gesture proceeds:
Rather than showing the path the user draws with each and every movement of the user's finger, maybe you just draw the lines between the center of the subviews, such as:
- (void)handlePan:(UIPanGestureRecognizer *)gesture
{
static NSMutableArray *gesturedSubviews;
static UIBezierPath *path = nil;
static CAShapeLayer *shapeLayer = nil;
// if we're starting a gesture, initialize our list of subviews that we've gone over
if (gesture.state == UIGestureRecognizerStateBegan)
{
gesturedSubviews = [NSMutableArray array];
}
// now figure out whether:
// (a) are we over a subview; and
// (b) is this a different subview than we last were over
CGPoint location = [gesture locationInView:gesture.view];
for (UIView *subview in gesture.view.subviews)
{
if (CGRectContainsPoint(subview.frame, location))
{
if (subview != [gesturedSubviews lastObject])
{
[gesturedSubviews addObject:subview];
if (!path)
{
// if the path hasn't be started, initialize it and the shape layer
path = [UIBezierPath bezierPath];
[path moveToPoint:subview.center];
shapeLayer = [[CAShapeLayer alloc] init];
shapeLayer.strokeColor = [UIColor redColor].CGColor;
shapeLayer.fillColor = [UIColor clearColor].CGColor;
shapeLayer.lineWidth = 2.0;
[gesture.view.layer addSublayer:shapeLayer];
}
else
{
// otherwise add this point to the layer's path
[path addLineToPoint:subview.center];
shapeLayer.path = path.CGPath;
}
[UIView animateWithDuration:0.25
delay:0.0
options:UIViewAnimationOptionAutoreverse
animations:^{
subview.alpha = 0.5;
}
completion:^(BOOL finished){
subview.alpha = 1.0;
}];
}
}
}
// finally, when done, let's just log the subviews
// you would do whatever you would want here
if (gesture.state == UIGestureRecognizerStateEnded)
{
// assuming the tags are numbers between 0 and 9 (inclusive), we can build the password here
NSMutableString *password = [NSMutableString string];
for (UIView *subview in gesturedSubviews)
[password appendFormat:#"%c", subview.tag + 48];
NSLog(#"Password = %#", password);
// clean up our array of gesturedSubviews
gesturedSubviews = nil;
// clean up the drawing of the path on the screen the user drew
[shapeLayer removeFromSuperlayer];
shapeLayer = nil;
path = nil;
}
}
That yields something like:
You have all sorts of options, but hopefully you now have the building blocks so you can design your own solution.
Forgive me Rob, pure Plagiarism here :) Needed the same code in swift 3.0 :) so I translated this great little example you wrote into swift 3.0.
ViewController.swift
import UIKit
class ViewController: UIViewController {
static let kMargin:CGFloat = 10.0;
override func viewDidLoad()
{
super.viewDidLoad()
// create a container view that all of our subviews for which we want to detect touches are:
let containerWidth = fmin(self.view.bounds.size.width, self.view.bounds.size.height) - ViewController.kMargin * 2.0
let container = UIView(frame: CGRect(x: ViewController.kMargin, y: ViewController.kMargin, width: containerWidth, height: containerWidth))
container.backgroundColor = UIColor.darkGray
view.addSubview(container)
// now create all of the subviews, specifying a tag for each; and
let cellWidth = (containerWidth - (4.0 * ViewController.kMargin)) / 3.0
for column in 0 ..< 3 {
for row in 0 ..< 3 {
let cell = UIView(frame: CGRect(x: ViewController.kMargin + CGFloat(column) * (cellWidth + ViewController.kMargin), y: ViewController.kMargin + CGFloat(row) * (cellWidth + ViewController.kMargin), width: cellWidth, height: cellWidth))
cell.tag = row * 3 + column;
container.addSubview(cell)
}
}
// finally, create the gesture recognizer
let pan = UIPanGestureRecognizer(target: self, action: #selector(handlePan))
container.addGestureRecognizer(pan)
}
func handlePan(gesture: UIPanGestureRecognizer)
{
var gesturedSubviews : [UIView] = []
// if we're starting a gesture, initialize our list of subviews that we've gone over
if (gesture.state == .began)
{
gesturedSubviews.removeAll()
}
let location = gesture.location(in: gesture.view)
for subview in (gesture.view?.subviews)! {
if (subview.frame.contains(location)) {
if (subview != gesturedSubviews.last) {
gesturedSubviews.append(subview)
subview.backgroundColor = UIColor.blue
}
}
// finally, when done, let's just log the subviews
// you would do whatever you would want here
if (gesture.state != .recognized)
{
print("We went over:");
for subview in gesturedSubviews {
print(" %d", (subview as AnyObject).tag);
}
// you might as well clean up your static variable when you're done
}
}
}
}
Update: Almost that is; I tried to translate the update too, but my translation missed something and didn't work, so I searched around SO and crafted a similar if slightly different final solution.
import UIKit
import QuartzCore
class ViewController: UIViewController {
static let kMargin:CGFloat = 10.0;
override func viewDidLoad()
{
super.viewDidLoad()
// create a container view that all of our subviews for which we want to detect touches are:
let containerWidth = fmin(self.view.bounds.size.width, self.view.bounds.size.height) - ViewController.kMargin * 2.0
let container = UIView(frame: CGRect(x: ViewController.kMargin, y: ViewController.kMargin, width: containerWidth, height: containerWidth))
container.backgroundColor = UIColor.darkGray
view.addSubview(container)
// now create all of the subviews, specifying a tag for each; and
let cellWidth = (containerWidth - (4.0 * ViewController.kMargin)) / 3.0
for column in 0 ..< 3 {
for row in 0 ..< 3 {
let cell = UIView(frame: CGRect(x: ViewController.kMargin + CGFloat(column) * (cellWidth + ViewController.kMargin), y: ViewController.kMargin + CGFloat(row) * (cellWidth + ViewController.kMargin), width: cellWidth, height: cellWidth))
cell.tag = row * 3 + column;
container.addSubview(cell)
}
}
// finally, create the gesture recognizer
let pan = UIPanGestureRecognizer(target: self, action: #selector(handlePan))
container.addGestureRecognizer(pan)
}
// Here's a Swift 3.0 version based on Rajesh Choudhary's answer:
func drawLine(onLayer layer: CALayer, fromPoint start: CGPoint, toPoint end:CGPoint) {
let line = CAShapeLayer()
let linePath = UIBezierPath()
linePath.move(to: start)
linePath.addLine(to: end)
line.path = linePath.cgPath
line.fillColor = nil
line.lineWidth = 8
line.opacity = 0.5
line.strokeColor = UIColor.red.cgColor
layer.addSublayer(line)
}
var gesturedSubviews : [UIView] = []
var startX: CGFloat!
var startY: CGFloat!
var endX: CGFloat!
var endY: CGFloat!
func handlePan(gesture: UIPanGestureRecognizer) {
if (gesture.state == .began)
{
gesturedSubviews = [];
let location = gesture.location(in: gesture.view)
print("location \(location)")
startX = location.x
startY = location.y
}
if (gesture.state == .changed) {
let location = gesture.location(in: gesture.view)
print("location \(location)")
endX = location.x
endY = location.y
drawLine(onLayer: view.layer, fromPoint: CGPoint(x: startX, y: startY), toPoint: CGPoint(x:endX, y:endY))
startX = endX
startY = endY
}
if (gesture.state == .ended) {
let location = gesture.location(in: gesture.view)
print("location \(location)")
drawLine(onLayer: view.layer, fromPoint: CGPoint(x: startX, y: startY), toPoint: CGPoint(x:location.x, y:location.y))
}
// now figure out whether:
// (a) are we over a subview; and
// (b) is this a different subview than we last were over
let location = gesture.location(in: gesture.view)
print("location \(location)")
for subview in (gesture.view?.subviews)! {
if subview.frame.contains(location) {
if (subview != gesturedSubviews.last) {
gesturedSubviews.append(subview)
subview.backgroundColor = UIColor.blue
subview.alpha = 1.0
}
}
}
}
}
I'm trying to zooming UIImageView in UIScrollView. And i've got this:
-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
return imageView;
}
-(void)scrollViewDidZoom:(UIScrollView *)scrollView {
[imageView setCenter:CGPointMake(scrollView.center.x, scrollView.center.y)];
}
-(void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale {
}
Problem is: When i'm zooming out image it's centered, but when i'm zooming in, image is shifted to left up corner.
Where is problem with my code?
Answer is remove all from scrollViewDidZoom: and add:
[self centerScrollViewContent];
Method implementation:
- (void)centerScrollViewContents {
CGSize boundsSize = self.scrollView.bounds.size;
CGRect contentsFrame = self.containerView.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.containerView.frame = contentsFrame;
}
Iam beginner in IOS Dev. asking about a way to make UIScrollView images scrolls by dragging UISlider . This is my case :
Required case :
when dragging slider , images scrolls on UIScrollView . also when scrolling images , slider changes its value accordingly .
Actual case :
when scrolling images , slider changes its value accordingly BUT when dragging slider images DONOT Scroll .
Here is my code , I wish any one tell me how to scrolling when slider drags .
Slider IBAction
- (IBAction)sliding:(UISlider *)sender{
int slider_value = (int)slider.value;
NSString *current_page = [[NSString alloc] initWithFormat:#"%i",slider_value];
current_page_lbl.text = current_page ;
[self loadPage:slider_value];
[self loadVisiblePages];
}
methods for UIScrollview :
- (void)loadPage:(NSInteger)page {
if (page < 0 || page >= self.pageImages.count) {
return;
}
UIView *pageView = [self.pageViews objectAtIndex:page];
if ((NSNull*)pageView == [NSNull null]) {
CGRect frame = self.scrollView.bounds;
frame.origin.x = frame.size.width * page;
frame.origin.y = 0.0f;
UIImageView *newPageView = [[UIImageView alloc] initWithImage:[self.pageImages objectAtIndex:page]];
newPageView.contentMode = UIViewContentModeScaleAspectFit;
newPageView.frame = frame;
[self.scrollView addSubview:newPageView];
[self.pageViews replaceObjectAtIndex:page withObject:newPageView];
}
}
- (void)purgePage:(NSInteger)page {
if (page < 0 || page >= self.pageImages.count) {
// If it's outside the range of what you have to display, then do nothing
return;
}
UIView *pageView = [self.pageViews objectAtIndex:page];
if ((NSNull*)pageView != [NSNull null]) {
[pageView removeFromSuperview];
[self.pageViews replaceObjectAtIndex:page withObject:[NSNull null]];
}
}
To loadVisiblePage
- (void)loadVisiblePages {
CGFloat pageWidth = self.scrollView.frame.size.width;
NSInteger page = (NSInteger)floor((self.scrollView.contentOffset.x * 2.0f + pageWidth) / (pageWidth * 2.0f));
NSLog(#"page loaded is %d",page);
self.pageControl.currentPage = page;
NSInteger firstPage = page - 1;
NSInteger lastPage = page + 1;
for (NSInteger i=0; i<firstPage; i++) {
[self purgePage:i];
}
for (NSInteger i=firstPage; i<=lastPage; i++) {
[self loadPage:i];
slider.value = 21-i ;
int slider_value = (int)slider.value;
NSString *current_page = [[NSString alloc] initWithFormat:#"%i",21-slider_value];
current_page_lbl.text = current_page ;
}
for (NSInteger i=lastPage+1; i<self.pageImages.count; i++) {
[self purgePage:i];
}
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
[self loadVisiblePages];
}
uislider is not suitable to use with uiscrollview....for this purpose there is one controll available name UIPagecontrol..
following link is the nice example with code which direct you to how to use it with UIScollview
UIPagecontroll with UIscollview with code Click Here