how to add UIButton to UIView with animation effect - ios

Question

I have a UIView in that, I am going to add 15 UIButtons. If I have written code like this
for(int i =0; i<15;i++)
{
[self.view addSubview:[self.buttonsArray objectAtIndex;i]];
}
But I want to subview UIButtons one after other. something like animation effect.How to achieve it.

Answer 1

try this:
in .h file
NSTimer *timer;
int buttonNo;
#property (nonatomic,retain) NSTimer *timer;
in .m file
#synthesize timer;
-(void) viewDidLoad {
[super viewDidLoad];
//start your timer where you write your for loop
buttonNo = 0;
timer = [NSTimer scheduledTimerWithTimeInterval:3.0 target:self selector:#selector(addbuttons) userInfo:nil repeats:YES];
}
-(void) addbuttons {
[self.view addSubview:[self.buttonsArray objectAtIndex;buttonNo]];
buttonNo++;
if (buttonNo == 15) {
[timer invalidate];
timer = nil;
}
}

Answer 2

I would do it like this:
const float fadein_duration = 0.3f;
const float time_between_fadein = 0.15f;
int index = 0;
for (UIButton* button in self.buttonsArray)
{
[self.view addSubview:button];
button.alpha = 0.0f;
[UIView animateWithDuration:fadein_duration delay:(index * time_between_fadein) options:0 animations:^{
button.alpha = 1.0f;
} completion:^(BOOL finished) {
// Do something maybe?
}];
index++;
}
Currently, the animation is to fade-in, but you should be able to adapt it to other types of animations.
There are 2 constants right now which you can use to control the duration of the fadein, and the time between the appearance of 2 buttons.
Make sure you set the correct frames for the buttons when you create them. Otherwise, you will just get a bunch of overlapping buttons. If you need you can set the position of the buttons dynamically when you add them to the subview.
Also, I changed the loop mode to use a fast iterator over the array, and keep a incremental index manually.

Answer 3

Im Unsure of what you mean. As for annimation EFFECT, you may want to implement some type of timer, otherwise they will all be added at the same time

Answer 4

If you want a fade in kind of animation then you can achieve something like this -
for(int i =0; i<15;i++)
{
[self.view addSubview:[self.buttonsArray objectAtIndex;i]];
[self performSelector:#selector(showBtn:) withObject:self.buttonsArray objectAtIndex;i] afterDelay:interval];
interval += 0.5f;
}
- (void) showBtn:(UIButton*) btn
{
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.5f];
[btn setAlpha:1.0f];
[UIView commitAnimations];
}
i assume the default alpha of all buttons in array is 0.

Answer 5

pls try this code
for(int i =0; i<15;i++)
{
[self.view addSubview:[self.buttonsArray objectAtIndex;i]];
[self performSelector:#selector(your animated methode) withObject:nil afterDelay:0.1];
}