How to hide Text from UILabel in IOS - ios

Question

I'm trying to display a set of numbers on a UILabel sequentially.
For example: I have an array with 5 numbers and each time I want one number from the array to be displayed for 2 seconds on the screen then disappear and then the next number…
This is what i have done so far, but it is not quite what I want. The code below just displays the last number in the array for 2 seconds and then disappears.
- (void)viewDidLoad
{
[super viewDidLoad];
NSMutableArray* myArray = [NSMutableArray array];
for (int i=0; i<5; i++) {
NSNumber *temp;
temp = [myArray objectAtIndex:i];
[self displayNumber:temp];
[myLabel setHidden:NO];
}
}
-(void) displayNumber: (NSNumber *) myNumber{
myLabel.text = [NSString stringWithFormat:#"%#", myNumber];
NSTimer *myTimer;
myTimer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:#selector(hideLabel) userInfo:Nil repeats:NO];
}
-(void) hideLabel{
[myLabel setHidden:YES];
}
I thought about having 5 functions and each gets called sequentially after 2 seconds, but that is very inefficient.
Are there any other ways I can do this?

Answer 1

Change this method
Hope it will works for you what you want
1) Define
NSMutableArray* myArray , int repeatCount; and NSTimer *myTimer in .h file and set its property;
2)
-(void)viewDidLoad
{
[super viewDidLoad];
//This will initialize your timer
myTimer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:#selector(showLabel) userInfo:Nil repeats:NO];
//This will trigger your timer
[myTimer fire];
//Your timer will run in a loop
[[NSRunLoop currentRunLoop] addTimer:myTimer forMode:NSDefaultRunLoopMode];
myArray = [NSMutableArray array];
}
-(void) displayNumber: (NSNumber *) myNumber{
myLabel.text = [NSString stringWithFormat:#"%#", myNumber];
}
-(void) showLabel{
if(repeatCount >= [myArray count])
{
repeatCount = 0;
}
NSNumber *temp = [myArray objectAtIndex:repeatCount];
repeatCount ++;
[self displayNumber:temp];
[myLabel setHidden:NO];
}

Answer 2

I think, that you can use timer with counter.
Create 3 properties:
#property (nonatomic, assign) int counter;
#property (nonatomic, strong) NSArray *array;
#property (nonatomic, strong) NSTimer *timer;
Set them in viewDidLoad: and start timer(with repetition):
- (void)viewDidLoad {
[super viewDidLoad];
_counter = 0;
_array = #[#0, #1, #2, #3, #4, #5];
_timer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:#selector(nextLabel) userInfo:Nil repeats:YES];
}
Update label:
- (void)nextLabel{
if (_counter == [_array count]) {
//stop in the end of array
[_timer invalidate];
return;
}
[_label setText:[NSString stringWithFormat:#"%#", _array[_counter]]];
_counter++;
}

Answer 3

Pass the array with NSNumber instances to the below method
- (void)updateLabelWithArray:(NSMutableArray *)array
{
if ([array count] != 0)
{
myLabel.text = [NSString stringWithFormat:#"%#", [array firstObject]];
[array removeObjectAtIndex:0];
[self performSelector:#selector(updateLabelWithArray:)
withObject:array
afterDelay:2.0f];
}
}
This should do.

Answer 4

Try this:
// Initialize the timer when you want to change the first number
[NSTimer scheduledTimerWithTimeInterval:0.0 target:self selector:#selector(changeNumber:) userInfo:#{#"currentNumber" : [NSNumber numberWithInt:0]} repeats:NO];
-(void)changeNumber:(NSTimer *)timer
{
NSDictionary * dictionary = [timer userInfo];
int number = [(NSNumber *)[dictionary objectForKey:#"currentNumber"] integerValue];
if (number < [numbersArray count])
{
myLabel.text = [NSString stringWithFormat:#"%#", [numbersArray objectAtIndex:number]];
[NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:#selector(changeNumber:) userInfo:#{#"currentNumber" : [NSNumber numberWithInt:number + 1]} repeats:NO];
}
}

Answer 5

try this hope this helps u .. :)
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[super viewDidLoad];
myArray = [[NSMutableArray alloc]initWithObjects:[NSNumber numberWithInt:3],[NSNumber numberWithInt:5],[NSNumber numberWithInt:6],[NSNumber numberWithInt:7],[NSNumber numberWithInt:10], nil]; //your array contains any number you want
index = 0; //showing the numbers from 0th index to last indx
[self.myLabel setHidden:NO];
[NSTimer scheduledTimerWithTimeInterval:2 target:self selector:#selector(DisplayFortwoSec) userInfo:nil repeats:YES];//call the method reguraly for 2 sec
}
- (void)DisplayFortwoSec
{
[self.myLabel setHidden:YES];
if(index == ([myArray count] - 1))
index = 0;//other stuffs to come out of loop like invalidating the timer
[self.myLabel setHidden:NO];
NSNumber *num = [myArray objectAtIndex:index];
NSString *strNum = [num stringValue];
self.myLabel.text = strNum;
[self.myLabel setHidden:NO];
index ++;
}