I intend to make a splash screen on iOS consists of a person, a chair objects. Each of these objects has seperated aspects like the hands, head, body and feets that animated together. I wonder which is better way to go? Importing a GIF file or coding CALayer objects then adding animation?
You can't use GIF files or any code for animation for your launchscreen (splash screen), you can only use a static image, a PNG or JPG (if the launchscreen is a storyboard).
So, if you want your app's startup with some animation then you should manage it in your first view controller.
You can animate imageview with image sets like,
UIImageView* myImageViewForAnimation = [[UIImageView alloc] initWithFrame:self.view.bounds];
myImageViewForAnimation.animationImages = [NSArray arrayWithObjects:
[UIImage imageNamed:#"image1"],
[UIImage imageNamed:#"image2"],
[UIImage imageNamed:#"image3"],
[UIImage imageNamed:#"image4"], nil];
myImageViewForAnimation.animationDuration = 1.0f;
myImageViewForAnimation.animationRepeatCount = 0;
[myImageViewForAnimation startAnimating];
[self.view addSubview: myImageViewForAnimation];
Update (as asked in comment) :
You can get your view on which you have added gesture recognizer in your action method or you can set tag to every imageview and handle it in action method.
For example,
-(void)tapOnProfileImage : (UITapGestureRecognizer*)recog{
UIImageView *tempView = (UIImageView *)recog.view;
// or
if (recog.view.tag == 1) {
// image 1
}
if (recog.view.tag == 2) {
//image 2
}
}
So, on every image view, you should add target with selector - tapOnProfileImage and you can differentiate it as mentioned in above code snippet!
You can use gif image but not directly on launch xib. You create one view controller and load gif image on that view controller, once animation is completed then remove this controller from navigation stack. https://github.com/Flipboard/FLAnimatedImage use this gif image view control.
Related
I have an outlet called myImage for an imageView that is set up with an animation of 5 images. With a Tap Gesture Recognizer on it, I want to have the users tap on the correct image as it quickly passes to move onto the next level.
There is an error in my code and this does not work:
- (void)viewDidLoad {
[super viewDidLoad];
self.myImage.animationImages =
[NSArray arrayWithObjects:
[UIImage imageNamed:#"examplePic1.png"],
[UIImage imageNamed:#"examplePic2.png"],
[UIImage imageNamed:#"correctPic.png"],
[UIImage imageNamed:#"examplePic4.png"],
[UIImage imageNamed:#"examplePic5.png"],
nil];
[self.myImage setAnimationRepeatCount:0];
self.myImage.animationDuration = 1;
[self.myImage startAnimating];
}
- (IBAction)TapGestureRecognizer:(id)sender {
if (self.myImage.image = [UIImage imageNamed:#"correctPic.png"]) {
// Launch next level
}
else {
// Vibrate Device and subtract points from score
}
}
You have a fundamental misconception in your code about objects and equality. I assume that you meant "==" in your TapGestureRecognizer method. However, even if you changed the = to == would not give you what you want.
The expressions like
[UIImage imageNamed:#"examplePic1.png"]
call a class method of UIImage that creates a new UIImage object. You have created 5 of these objects, put them into an array, an set the animationImage array of your UIImage object to these images. These objects are all different objects from myView.image: I can tell because I can see from your code that you have assigned 5 new objects to the animationObjects array. Your == test cannot ever work because you are comparing self.image to a brand new UIImage object.
What you are trying to do is determine which image the user touched. There is no method in UIImageView that tells you which animation UIImage is currently showing. You are assuming that the image property of the view will be changed as the animation images are displayed, but there is no reason for this assumption to be true: it is certainly not stated in the documentation. Even if you corrected your code (by doing something like this):
if(self.image == [self.animationImages objectAtIndex:2]){
}
your code would not be correct.
If I were trying to do what you want, I would create a UIView with 5 UIImageView as subview, each with their own gesture recognizer. I would use the frame property of each subview to do my animation.
Looks like the options are to determine which image "should" be showing based upon the startTime of the animation.
Determine which of its animationImages a UIImageView is displaying?
Or, just use a timer to set the currently displayed image.
Detect which image was clicked in UIImageView with animationImages
I am creating an Navigation Button. When user presses it, the image of the button should change, reflecting it's state (e.g. menu opened / closed). I decided to do a morphing-liek animation for this. Is it possible to implement with CoreAnimation? What animation type do I need to use?
I attached the picture to clearly illustrate what I want. Also, you might see these animations in "Pimp My Ride" show.
You can use animationImages property of UIImageView for this, like this:
myImageView = [[UIImageView alloc] initWithFrame:myImageViewbounds];
//Add images which will be used for the animation using an array. These should exist in your project and bundle already.
myImageView.animationImages = #[[UIImage imageNamed:#"1.png"], [UIImage imageNamed:#"2.png"],[UIImage imageNamed:#"3.png"], [UIImage imageNamed:#"4.png"],[UIImage imageNamed:#"5.png"]];
//Set the duration of the entire animation
myImageView.animationDuration = 0.5;
//Set the repeat count. If you don't set that value, by default will be a loop (infinite)
myImageView.animationRepeatCount = 1;
//Start the animation
[myImageView startAnimating];
To ensure smooth morphing like transition you may check out GPUImage which has many great blur filters. Ideally you should be able to wrap a blur animation between two image animations to achieve what you want.
I call this method in my ViewController, which contains a UIScrollView, when the user taps a button.
-(void) updateView:(NSURL *) urlPicture{
UIImageView *imageNews = [[UIImageView alloc]initWithFrame:CGRectMake(0,0,300,200)];
imageNews.contentMode = UIViewContentModeScaleAspectFit;
[imageNews setImageWithURL:urlPicture];
[self.scrollView addSubview:imageNews];
}
It seems to work fine, but when I got a strange behavior.
It doesn't clear the previous image to put the new one.
E.g: if the first image is 300x200 and the second one is 200x200 I still can see the sides of the first one when the app download the second.
I would like to know how to clear the previous image before download the second.
I already try imageNews.image = nil; but it didn't work
First you need to remove old view from scrollView. You can edit your code as mentioned below
#define IMAGE_VIEW_TAG 1001
-(void) updateView:(NSURL *) urlPicture{
UIView *oldView = [self.scrollView viewWithTag:IMAGE_VIEW_TAG];
if(oldView)
[oldView removeFromSuperView]
UIImageView *imageNews = [[UIImageView alloc]initWithFrame:CGRectMake(0,0,300,200)];
imageNews.tag = IMAGE_VIEW_TAG;
imageNews.contentMode = UIViewContentModeScaleAspectFit;
[imageNews setImageWithURL:urlPicture];
[self.scrollView addSubview:imageNews];
}
Well I am not really sure what your application does ,
but seems like you need to have only 1 image
so I would suggest you to remove the previous image.
There are 2 ways to do so:
1) you could use your image as property and simply call [_imageNews removeFromSuperView];
2) you can iterate through your self.scrollView's sub views and remove it from there.
Suppose I generated the 100 image views. First of all I wish to generate all 100 image views and add them in my scroll view.
So image view are clearly display it’s in position using background color
Then after I want to set images into the image view. I have to types of Dictionary (Which comes from the another class). One Dictionary into set Already Downloaded images and another one into only generate object (Remaining download images). I am downloading this image Asynchronously.
Then how can I set images into the image view?
-(void)GenerateImageView{
for (int ivalue = 0; ivalue < 100; ivalue++) {
imageView = [[UIImageView alloc] init];
//Give tag to the image view
imageView.tag = ivalue;
[imageView setBackgroundColor:[UIColor whiteColor]];
CGFloat xOrigin =ivalue *ascrollView.frame.size.width+50;
imageView.frame=CGRectMake(xOrigin40,imgYpos,ascrollView.frame.size.width-20, scrollViewHight);
//set imageview into the scroll view
[ascrollView addSubview:imageView];
}
}
Then how can I set images into the imageview?
UIImageView *imageView = [ascrollView viewWithTag:some_tag];
if ([imageView isKindOfClass:[UIImageView Class]])
imageView.image = your_UIImage_object;
u can not access the directly image view.And also make sure ur tag not start with 0.bcs 0 is a by default main view tag
imageView = (UIImageView *)[ascrollView viewWithTag:some_tag];
imageView.image = your_UIImage_object;
You could use the code Avt suggested, but instead of reinventing the wheel, I would suggest to look into
AFNetworking
an open-source networking lib. It comes with an extension to the UIImageView which allows you to load the images asynchronously out-of-the-box. There are many other useful features too.
After importing the extension you could then use:
[imageView setImageWithURL:[NSURL URLWithString:#"yourImageURL"]];
the image gets loaded asynchronously and automaticly set when it's done loading.
I have an image called Empty.png, it is a small-ish square tile, how could I instantiate the image to appear at several different points on the screen?
Thank you for any help in advance :)
You can can place UIImageView's wherever you want the image to appear.And then set the image property of each image view as this image. (UIImage object).
If you are using interface builder then you just have to type in the name of the file in the attributes inspector of the imageview in the interface builder.
Or you could do this:
UIImage *img = [UIImage imageName:#"Empty.png"];
imageView.image = img; //Assuming this is your utlet to the image view.
It depends on how you want to use it.
If you just draw it with core graphics, let's say in drawInRect: or so, then you simply draw it several times.
If you want to display it within one or a number of image views, then instanciate your UIImageViews and assign the same object to all of them. Or let the Interface Builder do the instanciation for you. But you cannot add a single UIView object several times to one or a number of subview-hierarchies. If you add a UIView as subview to a view then it will disappear from the position where it was before.
10 UIImageView may use the same UIView but you need 10 UIImageViews to display all of them.
The same applies to UIButtons and every UI-thing that has an image or background image.
this will get you one image into some view
CGPoint position = CGPointMake(x,y);
UIImageView *img = [[UIImageView alloc] init];
img.image = [UIImage imageNamed:#"Empty.png"];
img.frame = CGRectMake(position.x, position.y, img.image.size.width, img.image.size.height);
[someUIView addSubview:img];
if you make an array for the positions (x,y) of all the images, then you can just run it in a for loop and it will place the images into the view at the positions you want
note: CGPoints cant be stored in an NSArray since its not an NSObject type, either use a C/C++ array or use something else that can fit into a NSArray