I have a very simple UIViewController subclass. I've set an image view as its view. It takes the entire window.When I create a label and add it like this
UILabel *titleLabel=[self labelWithText:#"Some text"];
[self.imageView addSubview: titleLabel];
the label does not appear. But if I add it like this
[self.view addSubview: titleLabel];
it works, I see the label added to the view. A UIImageView is a subclass of UIView and it responds to the selector addSubview:. Then why does not this work?
Related
I want to add a "shadow" image on my view, but, i want part of my view to still be "visible". You better understand what i want to do, when look on screenshot:
I can add a UIView above my superview, but how could i make specific point "visible"? That actually mean make specific area of a view with different colour or opaque.
For your problem I had a way, try the below example.
1. First storyboard design: I had a UIButton
2. Added black View as a subview
UIView *blackView=[[UIView alloc]initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height)];
blackView.backgroundColor=[UIColor blackColor];
blackView.alpha=0.6f;
[self.view addSubview:blackView];
now result will be:
3. Add one more UIImageView with frame equal to button frame
UIImageView *imageView=[[UIImageView alloc]init];
imageView.frame=self.button.frame; //getting current UIButton bounds
imageView.image=[UIImage imageNamed:#"add_img.png"];
[self.view addSubview:imageView];
Now it looks same as what you want:
You have to add some views. A main view will be the container of your less-alpha view and of the opaque button.
MainView
|
------- UIView with 0.6 alpha
|
------- UIButton with 1 alpha
Indeed, if you change the alpha of the MainView, all subviews will be affected. Here, UIView with 0.6 will have the same frame as MainView but it will not affect UIButton alpha.
Make a new View, a parent View with clear color background. Add the black view and the button to the parent view and set the black view's alpha to 0.6 or whatever.
Try this:
Make a UIView called buttonBackgroundView, give it a black color and then
[self.view addsubView:buttonBackgroundView];
now make a UIView named plusView (or UIButton if this plus sign is a button) then
[self.view addsubView:plusView];
After that, give the alpha to the buttonBackgroundView
buttonBackgroundView.alpha = 0.6;
Happy coding!
I have designed a UIView in storyboard and the parent view is a tableview. But I want to set it hidden or unhidden depend on my decision.How can I do?
Get the view by tag? Or any other method？
I put up the code:
UIView *myview=[[UIView alloc] viewWithTag:99];
myview.hidden=true;
But it does not work!
Give the IBOutlet to the UIView in storyboard
#property(nonatomic, weak)IBOutlet UIView *subView;
In the ViewDidLoad or ViewWillAppear
put this line
subView.hidden=YES;
You should replace this line UIView *myview=[[UIView alloc] viewWithTag:99];
with
UIView *myview = [self.view viewWithTag:99];
if you have added on the main view and then try setting the view hidden.
Try writing this code in viewDidAppear.
I have UIViewController which set top storyboard and having few subviews in storyboard. and I want to add a UIImageView programmatically and set it as a background view. so if I add a UIImageView, storyboard subviews are not visible.
how can I send this UIImageView behind all the storyboard subviews?
Thanks
You need to go with the sendSubviewToBack:
UIImageView *imgView = [[UIImageView alloc]initWithFrame:self.view.frame];
imgView.image = [UIImage imageNamed:#"blank-background.jpg"];
[self.view addSubview:imgView];
[self.view sendSubviewToBack:imgView];
use method of subview's "bringSubViewToFront".
like
[parentView bringSubViewToFront:subViewImg];
For example:
there is a tableView, when it is pulled down, the back view display. the effect is like this:
I tried like this but not working:
[self.view addSubview:logoView];
[self.view addSubview:tableView];
You have to
add your logo image view below the table view in xib.
set table view background color to clear color
Set logo image hidden.
in - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate or check for your self which delegate is best suited. set the logo image hidden to NO
You set the tableView background as your logoview. Keep your UITableviewCell as what color you want.
I'm not sure if i recognize your problem but i think you want something like this:
you'll have to use:
[self.view insertSubview:aboveSubview: ];
[self.view insertSubview:belowSubview: ];
not
[self.view addSubview: ];
You can achieve the same as the example image above by adding the view with a negative y offset.
UIView *header = [[UIView alloc] initWithFrame: CGRectMake(0.0f, 0.0f - self.view.bounds.size.height, self.view.bounds.size.width, self.view.bounds.size.height)];
header.backgroundColor = [UIColor lightGrayColor];
[self.tableView addSubview:header];
However if you have content in this view, such as a logo, it will appear to be pulled down from the top, rather than behind the table, I don't know if this is the effect you want or not.
I have a XIB file with UIControl and UIScrollView elements inside of it. I would like to add a background image to the view. I tried adding an ImageView in IB but I could not get it to be present as a background and it obscured the control elements. Sending a sendViewBack message doesn't seem to do anything either.
When I create a UIImageView programmatically, it doesn't show up.
Below is the code I attempted:
Programmatic Creation
UIImage *imageBackground = [UIImage imageWithContentsOfFile:#"globalbackground"];
UIImageView *backgroundView = [[UIImageView alloc] initWithImage:imageBackground];
[[self view] addSubview:backgroundView];
[[self view] sendSubviewToBack:backgroundView];
Dealing with the NIB file
[[self view] sendSubviewToBack:background];
where background is an IBOutlet declared in the header file and connected to the NIB's image view in IB.
Is there a step I'm missing here?
Set the frame and dont use sendSubviewToBack:. If you are working with UIImageViews you have to use [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"imageName.png"]];
UIImageView *backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"imageBackground"]];
backgroundView.frame = self.view.bounds;
[[self view] addSubview:backgroundView];
hope this was the deal.
Don't add the image view as a subview of the scroll view, it needs to be a separate view at the top level of the hierarchy, then sent to the back of the Z-order.
You will need to set the background of your scroll view to [UIColor clearColor], and ensure that the scroll view is not marked as opaque. You can do this in code or in interface builder.
Don't use imageWithContentsOfFile and then just pass it a filename with no extension (I'm assuming .png) - this is probably returning nil. Use imageNamed: instead (you don't supply an extension in that case, iOS4 and above)
Depending on the nature of your image, you can also generate a colour with it and use that as the background colour of your scroll view. I'm assuming self.view is the scroll view:
self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:#"globalBackground"]];