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Why can't variables be declared in a switch statement?
(23 answers)
Closed 2 years ago.
i am trying to create a stack of UIImageViews in my app where i can indefinitely touch the uiimageview move it around the screen and drop it anywhere and there would still be a representation of the UIImageview in the original location where i could go grab another uiimageview move it and so on.the way i was trying to solve this problem was to create a uiimageview in IB that would remain in its original location and each time a touch is detected on top of it create a new uiimageview in the same location that would be able to be moved. here is the code i have so far:
-(void)dispatchTouchEvent:(UIView *)theView toPosition:(CGPoint)position
{
switch (glyphActive) {
case 1:
UIImage *image = [UIImage imageNamed:#"1.png"];
onePieceCopy = [[UIImage alloc] initWithImage:image];
onePieceCopy.frame = CGRectMake(currentPos.x, currentPos.y, 75, 75);
[self.view addSubview:image];
if (CGRectContainsPoint([onePiece frame], position)) {
onePiece.center = position;
[self bringSubviewToFront:onePiece];
}
//[onePieceCopy release];
break;
}
}
however i am getting errors on this line:
UIImage *image = [UIImage imageNamed:#"1.png"];
that says "expected expression before 'UIImage'".
and another error here:
[self.view addSubview:image];
that says " error: request for member 'view' in something not a structure or union"
i'm fairly new to all this and im not sure what im doing wrong can anyone give me a hand?
well for one thing [self.view addSubview:image] should be [theView addSubview:image]
Related
I have a a XCUITest that fails to find a specific image, yet it is perfectly visible on the screen.(emulators and physical devices)
How can I workaround or make the the UIImage accessible to the tests?
All I want to validate is whether the element is visible and touchable on the screen.
The UIImage is added as a subview to a UITableView - it is placed at the bottom of the TableView.
- (void)viewDidLoad {
[super viewDidLoad];
// portions of code left out here
_aView = [[UIImageView alloc] initWithFrame:CGRectZero];
[[self aView] setContentMode:UIViewContentModeScaleAspectFit];
[[self aView] setImage:[UIImage imageNamed:IMG_NAME]] ;
[[self tableView] addSubview:[self aView]];
The UIImageView is later layed out:
- (void) viewWillLayoutSubviews {
// portions of code left out here
[[self aView] setFrame:CGRectMake(0, MAX([self tableView].contentSize.height - 41 ,[self tableView].bounds.size.height - 41) , 180, 30)];
[[self aView] setCenter:CGPointMake([self tableView].center.x, [self aView].center.y)];
Then when running the test:
let app = XCUIApplication()
//this works
let tapString = localizedString("skip")
let skipButton = app.buttons[tapString].firstMatch
if (skipButton.exists) {
skipButton.tap()
}
let theImage = app.images["img.png"]
let doesExist = theImage.exists //<< it never exists
Also doing a debug and printing all the images
does not show the image. I set a breakpoint at the line with doesExists
and in the debug window I run the command:
po app.images
Many images are found but not the particular image under test.
Is there perhaps an alternative to solve this problem?
This is what I did:
#implementation BGUIActivityIndicator
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
}
[self customInitialize];
return self;
}
-(id)initWithCoder:(NSCoder *)aDecoder
{
self = [super initWithCoder:aDecoder];
[self customInitialize];
return self;
}
-(void)customInitialize
{
UIView * theImageView= [self findASubViewforClass:[UIImageView class]];//
UIImageView * theImageView1 = (UIImageView *) theImageView;
theImageView1.image = [UIImage imageNamed:#"spinner_blue"];
[theImageView1.image saveScreenshot];
while (false) ;
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
// Drawing code
}
*/
#end
Everything seems perfect. [theImageView1.image saveScreenshot]; jot down both the old and new view perfectly.
However, nothing changes. Why?
I am not exactly asking how to change the image of UIActivityIndicator. There are tons of it already. I want to use it by subclassing UIActivityIndicator because I think it's the most elegant solution. I can't seem to do that.
In particular, I am asking why my approach, which works for changing background of search controller, for example, doesn't work for this.
According to the UIActivityIndicatorView Class Reference ,there is no way/ chance to change the image through sub-classing.
However you can change its activityIndicatorViewStyle , color of the activity indicator,UIActivityIndicatorStyle etc..
I think, without sub-classing, the class class UIImageView provides a very useful and simple way to implement such a thing. The only thing you have to do is to:
1.Provide a number of images that reflect your indicator animation.
2.Create a new UIImageView instance and set images and animation duration.
3.Position your custom activity indicator within your current view.
SAMPLE CODE:
//Create the first status image and the indicator view
UIImage *statusImage = [UIImage imageNamed:#"status1.png"];
UIImageView *activityImageView = [[UIImageView alloc]
initWithImage:statusImage];
//Add more images which will be used for the animation
activityImageView.animationImages = [NSArray arrayWithObjects:
[UIImage imageNamed:#"status1.png"],
[UIImage imageNamed:#"status2.png"],
[UIImage imageNamed:#"status3.png"],
[UIImage imageNamed:#"status4.png"],
[UIImage imageNamed:#"status5.png"],
[UIImage imageNamed:#"status6.png"],
[UIImage imageNamed:#"status7.png"],
[UIImage imageNamed:#"status8.png"],
nil];
//Set the duration of the animation (play with it
//until it looks nice for you)
activityImageView.animationDuration = 0.8;
//Position the activity image view somewhere in
//the middle of your current view
activityImageView.frame = CGRectMake(
self.view.frame.size.width/2
-statusImage.size.width/2,
self.view.frame.size.height/2
-statusImage.size.height/2,
statusImage.size.width,
statusImage.size.height);
//Start the animation
[activityImageView startAnimating];
//Add your custom activity indicator to your current view
[self.view addSubview:activityImageView];
See the full details Here
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
C function calling objective C functions
I've done the following code in ViewController.m
-(void) callIncomingCreateButton
{
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
//set the position of the button
button.frame = CGRectMake(100, 170, 100, 30);
//set the button's title
[button setTitle:#"Click Me!" forState:UIControlStateNormal];
//add the button to the view
[self.view addSubview:button];
}
- (IBAction)DemoCall:(id)sender {
callIncoming(1, "a");
}
int callIncoming(int a, char* b)
{
ViewController * tempObj = [[ViewController alloc] init];
[tempObj callIncomingCreateButton];
return a;
}
But still the UIButton is not getting displayed, what am I missing here.
Edit : this is for iOS
and yes, the function does get called. I put a breakpoint and stepped it through.
ViewController * tempObj = [[ViewController alloc] init];
[tempObj callIncomingClass];
It's hard to tell from your example, but assuming that -callIncomingClass is actually part of the definition of ViewController and callIncoming() is called from somewhere else, a likely problem is that tempObj is not the current view controller. You'd need to push tempObj onto the navigation stack, present it modally, or otherwise make it the active view controller in order for its view to be loaded. If its view isn't loaded, then there's no view to add the button to, and even if it has a view, that view won't be in the window.
i have this method i use to load many images to scroll view, but when the images load from the url my scroll view is stuck and i can't understand how to load them in the background so the user will not feel it.
this method will call few times (8) in "for" cycle.
- (void)loadPhotosToLeftscroll{
//getting image information from JSON
NSMutableDictionary *photoDict;
photoDict = [leftPhotoArray lastObject];
//getting the photo
NSString *photoPath = [photoDict objectForKey:#"photos_path"];
NSLog(#"photo Path:%#",photoPath);
NSData * imageData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:photoPath]];
UIImage *image = [UIImage imageWithData:imageData];
// use the image how you like, say, as your button background
//calculating the hight of next photo
UIImageView *leftImage = [leftBlockScroll.subviews lastObject];
//allocating photoView
UIImageView *photoView = [[UIImageView alloc]initWithFrame:CGRectMake(5 , leftImage.frame.origin.y + leftImage.frame.size.height+5, image.size.width/2, image.size.height/2 )];
photoView.userInteractionEnabled=YES;
[photoView.layer setMasksToBounds:YES];
[photoView.layer setCornerRadius:3];
//getting items list
NSDictionary *sh_items = [photoDict objectForKey:#"items"];
//adding image button
UIButton *imageOverButton = [UIButton buttonWithType:UIButtonTypeCustom];
imageOverButton.frame = CGRectMake(0, 0, photoView.frame.size.width, photoView.frame.size.height);
[imageOverButton addTarget:self action:#selector(LeftimagePressed:) forControlEvents:UIControlEventTouchUpInside];
[imageOverButton setTag:[leftPhotoArray count]-1];
[photoView addSubview:imageOverButton];
//adding sh button to imageView
[self addThe_sh_signs:sh_items To_ImageView:photoView];
//subViewing the image to the scrollView
[self insert_Image:image toImageView:photoView in_Scroll:leftBlockScroll];
//calclulating the position of next imageView in scroll.
nextLeftPhotoHight = photoView.frame.size.height + photoView.frame.origin.y + 5;
//calculating the hight of the highest scroll view in both.
leftBlockScroll.contentSize = CGSizeMake(160, [self theSizeOfScrollViewHight]);
rightBlocScroll.contentSize = CGSizeMake(160, [self theSizeOfScrollViewHight]);
isLoadindContant = NO;
[self.view reloadInputViews];
[leftBlockScroll reloadInputViews];
}
please do not send me to some link that trying to explain how to use the asynchronous.
Try to explain according the method you see here.
Im here for any question, that you need to ask to help me.
You will have to do it asynchronously in a proper way. I do not think there is any way around that. I subclassed an UIImageView object and placed many instances of it within the cells of a talbe (in your case within the scroll view). The subclass objects are initialized with an url and load their image asynchronously (with some caching so that the image is not loaded every time).
This tutorial helped me much in the beginning:
http://www.markj.net/iphone-asynchronous-table-image/
You will just have to adopt that to your scroll view. The underlaying principle remains the same.
So I have run into a fairly complex problem with my application.
I have about 40 UIImageView objects that need to be displayed at different locations when different ones are stacked (EX img 1 needs to take img 2 place if img2 ==NO).
What I am trying to do is use a "for loop" and run through all my Boolean values that check if the image is selected.
I was curious if it is at all possible to call variable like this
-(IBAction) button:(id) sender{
scrollView.hidden = YES;
NSInteger i = 1;
(#"imagenumber%d", i) = [[UIImageView alloc] initWithFrame: CGRectMake (28, 230, 86, 26)];
[[imagenumber(#"%d", i)] setImage:[UIImage imageNamed:#"csa.jpg"]];
[self.view addSubview: [imagenumber(#"%d", i)]];}
}
where #"imagenumber%d" is my NSImageView and i is a number ranging from 1-40.
I'm sorry if this is confusing, I really would appreciate any help at all on the subject because I can’t seem to get any idea and have been working on this problem for several weeks.
Put the views in a NSMutableArray - you can access elements in those by index, use fast enumeration, ... E.g.:
UIImageView *image = [[UIImageView alloc] ...
[myMutableArray addObject:image];
// ...
For the sake of hilarity you could also put them in a intrinsic array and use pointer arithmetic. (Which is probably what happens behind the scenes with faster enumeration for those interested)
UIImageView * imageArray[40];
...
for(UIImageView * this = imageArray; this; this++)
{
this = [[UIImageView alloc] initWithFrame: CGRectMake (28, 230, 86, 26)];
...
}