Changing UIImage randomly after 2 seconds in iOS 7 - objective-c

Question

I have an array of images. And I am trying to change the images randomly after 2 seconds.
-(void)loadImage
{
for(int i =0;i<=[imageArray count];i++)
{
imageView.image=[imageArray objecyAtIndex:i];
}
}
-(void)viewDidload
{
imageTimer = [NSTimer scheduledTimerWithTimeInterval: 2.0 target:self selector:#selector(loadImage) userInfo:nil repeats: YES];
}
But it is not working for me . It will be great appreciable if any one help to do this. Thanks .

Answer 1

modify your code in following way ..
-(void)viewDidload
{
index = 0; //index should be instance variable
imageTimer = [NSTimer scheduledTimerWithTimeInterval: 2.0 target:self selector:#selector(loadImage) userInfo:nil repeats: YES];
}
-(void)loadImage
{
if(index != imageArray.count-1)
{
imageView.image=[imageArray objecyAtIndex:index];
index++;
}
else
{
[imageTimer invalidate];
}
}

Answer 2

You have to make some changes in your loadImage method. You have to generate random number and set a range of the random numbers. I tried like this and it worked for me.
-(void)loadImage
{
NSString *max=#"3";
NSString *min=#"0";
int randNum = rand() % ([max intValue] - [min intValue]) + [min intValue];
_changeableImageView.image=[UIImage imageNamed:[imageArray objectAtIndex:randNum]];
}
- (void)viewDidLoad
{
[super viewDidLoad];
_changeableImageView.image=[UIImage imageNamed:#"program.jpg"];
imageArray=[[NSMutableArray alloc]initWithObjects:#"corporate.jpg",#"district.jpg",#"program.jpg", nil];
imageTimer = [NSTimer scheduledTimerWithTimeInterval: 2.0 target:self selector:#selector(loadImage) userInfo:nil repeats: YES];
}
I hope it will for for you.

Answer 3

-(void)loadImage
{
NSUInteger randomIndex = arc4random() % [imageArray count];
imageView.image = imageArray[randomIndex];
[self performSelector:#selector(loadImage) withObject:nil afterDelay:2.0];
}
-(void)viewDidload
{
[self performSelector:#selector(loadImage) withObject:nil afterDelay:2.0];
}

Answer 4

Your loadImage method does not select a random image from the array. What it actually does is iterate through every single member in the array and assign them to the image view one by one every time it is run.
To set a random image each time the method is called, your method should look like this:
-(void)loadImage
{
NSUInteger randomIndex = arc4random() % [imageArray count];
imageView.image = imageArray[randomIndex];
}

Answer 5

The problem with your code is that whenever the timer fires, the whole loop in loadImage is executed, so that your image is always the last image of the array.
You have to define a property that holds e.g. the index of the currently displayed image. In loadImage, you had to increment then this index (modulo the array size), and assign the next image to your imageView.

Answer 6

It's not working because every time loadImage is called you loop through and set every image in the array and therefore always end up with the last image in the array. Try something more like this:
-(void)loadImage{
int randNum = arc4random() % imageArray.count;
imageView.image=[imageArray objecyAtIndex:randNum-1];
}//end method