Say I have a UIProgressBar with size (394,129,328,9) and I increased the height with
CGAffineTransform transform = CGAffineTransformMakeScale(1.0f, 3.0f);
PgView.transform = transform;
What I need to implement is : If I have 5 minute time,the progressView should be filled with a certain amount and totally filled at the end of 5 minute. Same for 1 minute and 30 minutes too.
I am implementing like this :
-(void)viewWillAppear:(BOOL)animated
{
CGAffineTransform transform = CGAffineTransformMakeScale(1.0f, 3.0f);
PgView.transform = transform;
recievedData = 0.01;
xpectedTotalSize = 1.0;
PgView.progress = 0.0;
[self performSelectorOnMainThread:#selector(makeMyProgressBarMoving) withObject:nil waitUntilDone:NO];
}
- (void)makeMyProgressBarMoving
{
float actual = [PgView progress];
if (actual < 1)
{
PgView.progress = actual + ((float)recievedData/(float)xpectedTotalSize);
[NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:#selector(makeMyProgressBarMoving) userInfo:nil repeats:NO];
}
else{
}
}
And it works. But I want to implement progress and time interval dynamically? Any idea??
Thanks in advance.
It's difficult to understand your intention. As I suppose, you want to update the progress bar only if new values are available instead of updating with a fixed timer interval.
This would result in the simple answer: update your progress bar whenever you change the value of 'recievedData'. So, the method 'makeMyProgressBarMoving' doesn't need a timer. Also, you don't need to remember the 'actual' value. You can directly assign the 'receivedData/xpectedTotalSize' to the progress bar.
- (void) updateProgressBar
{
PgView.progress = ((float)receivedData/(float)xpectedTotalSize);
}
- (void) updateReceivedData
{
if (receivedData < 20)
receivedData += 1.0;
else
receivedData += 10.0;
[self updateProgressBar];
}
-(void)viewWillAppear:(BOOL)animated
{
receivedData = 0.0;
xpectedTotalSize = 100.0;
[NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:#selector(updateReceivedData) userInfo:nil repeats:YES];
}
Now, a timer is still used for demonstration to call 'updateReceivedData' which just increments 'receivedData' and calls 'updateProgressBar'. As you see, 'updateReceivedData' does not increment linear, again just for demonstration. If 'updateReceivedData' would be called on demand instead by the timer then also the progress bar would be updated on demand. Now it's just an issue of how and when you want to update your receivedData. It's not an issue regarding progress bars.
Related
I want to show number in a UILabel from an unknown number to unknown number. Suppose from 40 to 699. I want to show this one by one and then break the loop sequence when required number is arrived.
E.g {40,41,42...667,668,669}
I want to remove the previous number from the label and add new number to the label object.
I am confuse to use UIAnimation in for() Loop.
Does anyone have any idea how to do this?
Using timer to animation with increase counter.
int loopCount;
NSTimer *myTimer;
// Method that calls your timer.
- (void)doStuff {
loopCount++;.
self.yourLabel.alpha = 0;
[UIView animateWithDuration:0.65 delay:0 options:UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse animations:^{
self.yourLabel.alpha = 1;
} completion:nil];
if (loopCount >= 669) {
[myTimer invalidate];
myTimer = nil;
self.yourLabel.alpha = 0;
}
}
// Method that kicks it all off
- (IBAction)startDoingStuff {
myTimer = [NSTimer scheduledTimerWithTimeInterval:0.75
target:self
selector:#selector(doStuff)
userInfo:nil
repeats:YES];
}
Task:
Take Progress bar (NSProgressIndicator) from 0 to 100 smoothly.
Problem:
Progress bar is getting 0 to 100 but not smoothly.
What I have done as yet:
// scan click on which the prgress should start
-(void)ScanNowClick:(id)sender
{
// setting initial value of progress bar
[progressbar setDoubleValue:0];
// starting timer
[NSTimer scheduledTimerWithTimeInterval:0.5
target:self
selector:#selector(callAfter10sec:)
userInfo:nil
repeats:YES];
}
// timer that will update progress bar
-(void)callAfter10sec:(NSTimer *)time {
double value = [progressbar doubleValue]+10;
[[progressbar animator] setDoubleValue:value];
if(value >= 100)
{
[time invalidate];
}
}
/// layer is also set
You should use CADisplayLink and not NSTimer when dealing with UI related updates.
The link is called 60 times per second (per the refresh rate of the screen)
In the callback you should calculate the proportion to advance the view
I have an action in while loop.
while (y < 26)
{
[NSTimer scheduledTimerWithTimeInterval:.06 target:self selector:#selector(self) userInfo:nil repeats:NO];
self.ball.center = CGPointMake(_ball.center.x + 0, _ball.center.y + 10);
y = y + 1;
}
I have an image of a ball a when the button is click, I want the ball to start moving downwards, but I need it to wait for .5 seconds and then go again or it will go down instancely. I tryed sleep(.5) and
[NSTimer scheduledTimerWithTimeInterval:.05 target:self selector:#selector(self) userInfo:nil repeats:NO];, but they did not work.
In iOS you don't do animations by hand (in this case you're trying to do it with a while loop). Instead, you ask the OS to do the animation for you. The following is a super simple option to achieve the ball movement you want:
[UIView animateWithDuration:1.0 animations:^{
self.ball.center = CGPointMake(self.ball.center.x + 0, self.ball.center.y + 10);
}];
Please replace your code (including the while loop) with the one I'm giving you here.
Hope this helps!
You can animate move of a ball as following:
/// declare block for animating
#property (nonatomic, strong) void(^animationCompletion)(BOOL);
CGFloat static kAnimationDuration = 0.3;
...
/// you declare here next position
CGPoint myPoint = CGPointMake(x, y)
/// create weak of self to not make retain cycle
ClassName __weak weakSelf = self;
/// define completion block declared above.
/// this block is called when one step is done. look below this block.
self.animationCompletion = ^(BOOL finished) {
myPoint = CGPointMake... //next point to move to
if (myPoint == lastPoint/*or other check when to finish moving*/) {
weakSelf.animationCompletion = nil; /// nil your block to not call this again
}
/// call next animation with next step
UIView animateWithDuration:kAnimationDuration animations:^{
// animate to next point
} completion:weakSelf.animationCompletion; /// and call block itself to make some sort of loop.
}
/// here is first call of above block. you make first step here.
UIView animateWithDuration:kAnimationDuration animations:^{
// animate to next point
} completion:self.animationCompletion;
Is it working? Yes. Look at Arcade Balls app for iOS. I used it there.
I am a beginner when it comes to iOS App development. I want to move a label from left to right until it reaches half the screen width - i.e. the label should move by 240px (the label moves left to right like a marquee).
I have used NSTimer and I want to stop the timer when the label reaches half the view's width.
I have used the following code but it moves the label out of the view:
- (void)viewDidLoad {
[super viewDidLoad];
timer = [[NSTimer scheduledTimerWithTimeInterval:0.09 target:self selector:#selector(time:) userInfo:nil repeats:YES] retain];
}
- (void)time:(NSTimer *)theTimer {
label.center = CGPointMake(label.center.x+3.5, label.center.y);
NSLog(#"point:%#", label);
if (label.center.x < - (label.bounds.size.width/2)) {
label.center = CGPointMake(320+(label.bounds.size.width/2), label.center.y);
}
}
How can I solve this, please?
If you want to stop the repeating timer, you can use
if (/*You label is in position*/)
[myTimer invalidate];
But that's not the normal way to do animation in iOS, try this instead:
CGRect endFrame = /*The frame of your label in end position*/
[UIView animateWithDuration:0.5 animations:^{ myLabel.frame = endFrame;}];
To stop a timer, do [timer invalidate].
You can't "pause" a timer, so once you do this you'll need to call another timer.
correct way to invalidate your timer is
[myTimer invalidate];
myTimer = nil;
So I have two problems but both are related.
I created a "animation" that moves a progress view when a button is clicked by using NSTimer. This animation works fine the first couple times the button is clicked but after that it starts speeding up the process, practically skipping from the initial start of the NSTimer loop to the end of the NSTimer loop. I was wondering if anyone has ever heard of this issue and/or knows a solution?
I created the same thing in question 1 but in a UItableViewCell and the NSTimer loop is activated when the edit button is pressed. The edit button activates a function that has this [self.tableView2 setEditing:NO animated:YES]; and the NSTimer scheduledTimerWithInterval ... (The progress view animation). The issue here is that it the setEdit animation no longer animates it just pops into place. Once again, does anyone know of a solution for this?
Here is the code for question 2 (Both the code for the questions are very similar so if you can spot the problem here then it is likely I can use that solution to fix them both):
-(void)editTable{
[self.tableView2 setEditing:YES animated:YES];
iCount = 8;
iCount2 = 257;
forwardProgress = YES;
animationFlag = YES;
myTimer = [NSTimer scheduledTimerWithTimeInterval:0.001f target:self selector:#selector(increaseAmount) userInfo:nil repeats:YES];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:#selector(cancelEdit)];
}
-(void)cancelEdit{
[self.tableView2 setEditing:NO animated:YES];
forwardProgress = NO;
animationFlag = YES;
iCount = 38;
iCount2 = 227;
myTimer = [NSTimer scheduledTimerWithTimeInterval:0.001f target:self selector:#selector(increaseAmount) userInfo:nil repeats:YES];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:self action:#selector(editTable)];
}
-(void)increaseAmount{
float max = 38.0f;
float max2 = 257.0f;
float min2 = 227.0f;
float min = 8.0f;
if (animationFlag == YES) {
if (forwardProgress == YES) {
if (iCount <= max) {
iCount++;
// NSLog(#"iCount = %i", iCount);
}
if (iCount2 >= min2) {
iCount2--;
// NSLog(#"iCount2 = %i", iCount2);
}
if (iCount <= max) {
[tableView2 reloadData];
}
if (iCount2 >= min2) {
[tableView2 reloadData];
}
if (iCount == max) {
animationFlag = NO;
}
newFrame = CGRectMake(iCount, 33.0f, iCount2, 11.0f);
[tableView2 reloadData];
}else{
if (iCount >= min) {
iCount--;
NSLog(#"iCount = %i", iCount);
}
if (iCount2 <= max2) {
iCount2++;
NSLog(#"iCount2 = %i", iCount2);
}
newFrame = CGRectMake(iCount, 33.0f, iCount2, 11.0f);
if (iCount >= min) {
[tableView2 reloadData];
}
if (iCount2 <= max2) {
[tableView2 reloadData];
}
if (iCount == min) {
animationFlag = NO;
}
}
}
}
Any timer invalidates itself when it has finished unless it has repeats:YES. If that's the case, you need to invalidate it yourself at some point, ideally when all your conditions are met. In your case I think you'd want it when you're setting animationFlag == 0 (I presume that's when you want the timer to stop firing). Use something like this:
if ([myTimer isValid]) {
[myTimer invalidate];
myTimer = nil;
You also need to place that code in editTable at the beginning. That way, if a timer was running and someone started it again, it would first reset, and then begin again.Otherwise you have multiple timers all firing increaseAmount. You also need it anytime the user cancels the timer.
You probably have to invalidate the timer from your first animation. I suspect that you have two timers running and therefore the speed of the animation is doubled.
This is probably because of the reloadData call in your timer callback. A tableview cannot reload and animate at the same time.
I believe rgeorge is correct;
You don't get rid of the "myTimer" when you stop your animation. So even though you may not see the animation any more, increaseAmount is still being called over and over. Change the method to something like this:
-(void)increaseAmount:(NSTimer*)Timer;
Then, when you're done with increase amount, make sure to turn off the timer from within increaseAmount.