I'm trying to make a square (50 x 50) UIView in the lower right hand of my main view, but I'm confused about why it's not entirely visible. In this instance, only the tip of it is visible from the bottom. Am I confusing some concept?
CGFloat width = CGRectGetWidth(self.view.bounds);
CGFloat height = CGRectGetHeight(self.view.bounds);
UIView *transparentFloater = [[UIView alloc] initWithFrame:CGRectMake(width - 50.f, height - 50.0f, 50.0f, 50.0f)];
[self.view addSubview:transparentFloater];
Try to add the autoresizing mask:
transparentFloater.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleLeftMargin;
If I am not wrong, You have created your ViewController with xib and in the attributes of view, you have forgot to mention that you are using a "navigation bar" as "top bar".
Reason
So in ViewDidLoad, view in .xib with a height X is returned. But as you might have loaded the viewController using UINavigationController, after loading the height of view is decreased by 44pixels.
Suggestions :
1) Whenever you know that you are going to have navigation bar on top please mention it in .xib file as well.
For doing so click on the view in xib and select the option called topbar in attributes Inspector of utilities area
2) Call the following api
NSLog(#"In ViewDidAppear %#",NSStringFromCGRect(self.view.bounds));
in
viewDidLoad
viewDidAppear
to track whats happening with the bounds of view
You does not need to do anything just put
transparentFloater.backgroundColor = [UIColor redColor];
because your view (custom) is invisible (because your main view color and custom view color are same (white) ) may be. I tried your code in my demo project. it worked perfectly for me.
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 a storyboard with a square imageView in the middle at: 280,140 (vertical)
When the application starts i am able to move this imageView by pressing buttons. I move the imageView using:
_mainImage.frame = CGRectMake(_mainImage.frame.origin.x + 2, _mainImage.frame.origin.y, _mainImage.frame.size.width, _mainImage.frame.size.height);
while the application is running i keep adding new imageViews to the mainView:
UIImageView *imgView;
imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, yCoordinate, 50, 10)];
imgView.backgroundColor = [UIColor whiteColor];
[self.view addSubview:imgView];
each time i call this code the square imageView i have placed in the middle and moved around, gets set back to its starting position. It seems like the mainView gets "reset" each time the addSubview gets called. Is there any way i can add a subview without having the mainView "reset"?
Most likely your view is set up using Autolayout (this is the default for storyboards or nibs) and when you add a new subview, a layout pass is performed which resets your views position back to that defined by its original constraints.
You should move your view by updating its constraints, or turn off Autolayout. There are lots of posts around explaining how to do either of these things.
I have an iphone app with 2 ViewControllers . Both screens(viewcontrollers) show a loading screen. I create the loading screen programmatically:
UIView *loadingScreen = [[UIView alloc] initWithFrame:CGRectMake(100,200,144,144)];
loadingScreen.center = CGPointMake(self.view.frame.size.width / 2.0, self.view.frame.size.height / 2.0);
//{.. Other customizations to loading screen
// ..}
[self.view addSubview:loadingScreen];
For some reason, the second viewcontroller's loadingScreen is significantly lower and it isn't centered on the screen. The first viewcontroller works perfectly and is dead center like I want.
The second viewcontroller is a UITableView and it shows the uinavigationbar, whereas the first viewcontroller doesn't show the uinavigationbar. Also, I use storyboard for my app.
I've outputted to the NSLog self.view.frame.size.height and loadingScreen.center in both instances and THEY HAVE THE SAME COORDINATES! So, not sure why it is showing up lower. Any ideas why the second loadingScreen is lower and how to fix? Thanks!
You mention that one screen displays a UINavigationBar while the other does not. When you display a navigation bar, it offsets the rest of your view - in this case by shifting it down.
There are two quick fixes. You can either adjust your center point up by the size of the UINavigationBar (65 pts - unless it's a custom UINavigationBar and you've changed its size) or you can set the "Adjust Scroll View Insets" value to false in the attributes inspector.
The latter is probably the easiest and comes most recommended. Note though, that the top of your UITableView will now be underneath the UINavigationBar.
My final note would be that if you wanted to do it programmatically than in your UITableView's delegate you can call
- (BOOL)automaticallyAdjustsScrollViewInsets
{
return NO;
}
I have a custom UIViewController which create a view containing an action bar at the top (view with 4 buttons), a tableview and then another view below the tableview. Layout is done all in code and is not using auto layout.
Everything works perfectly on various device with iOS 7.0 and 7.0.2, but in the simulator, the root view of the controller get anchored at the top right corner of the screen (0,0) instead of below the navigation bar.
I'm going to force the relay out in the viewDidAppear: method, but this seem like a hack...
Thanks for any insights
Edit: added an image. You can see the UIView highlighted. As ManicMonkOnMac mentioned, the UIView is under the toolbar (but this only happens in the simulator, on the device, the view lines up fine)
In the loadView method on the controller, i set the frame when creating the view:
- (void)loadView
{
// Our parent view controller will resize us appropriately. The size set
// here is a convenience for initial view layout.
self.view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 320)];
self.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
}
But this frame is later changed. Not by my code, though, but by UIkit code)
Edit2: addded loadView method body
EDIT: After going through session 201 of WWDC 2013, I think I have the solution.
in iOS 7 there is a property that you can set on your view controllers to specify whether you want the views to be overlapped by navigation bar.
viewController.edgesForExtendedLayout = UIRectEdgeNone;//UIRectEdgeAll specifies that nav bars should overlap the view.
Unlike iOS 6, navigation bars are placed over the views in iOS 7.
Use the frame size that excludes the navigation bar.
code:
CGRect frame = CGRectMake(self.view.frame.origin.x,self.view.frame.origin.y+self.navigationController.navigationBar.frame.size.height,self.view.frame.size.width,self.view.frame.size.height);
CustomView *view = [[CustomView alloc] initWithFrame:frame];
[self.view addSubview: view];
I noticed that with a NavigationController on an iPhone, the height is 460. So it includes the whole screen except the status bar.
However, when I add something at coordinate 0, it shows up after the NavigationBar, although the size of the navigation bar is included in the height (meaning the entire frame of this view sticks off the screen).
Did I make a mistake? If not, why is it structured this way?
NSLog(#"Frame: %#", [NSValue valueWithCGRect: self.view.frame]); // prints {(0, 20), (320, 460)}
UIScrollView* scrollView = [[UIScrollView alloc] initWithFrame: CGRectMake(0, self.navigationController.navigationBar.frame.size.height, self.view.frame.width, 50)];
[self.view addSubview: scrollView]; // showing up 44px *after* the nav bar
I already answered your other similar question, but here is one for this.
In viewDidLoad you will see the views height as 460 because at that point it hasn't resized to account for the Nav Bar.
But If you printed the same frame out in say viewWillAppear you will see that now the frames height has adjusted for the Nav Bar.
So if you want to add something in viewDidLoad, you need to add it based on the views frame, add whichever resizing mask will do the job you want, and see it adjust correctly once the view appears.