Just having some hard time with UIButton. I remove all subviews using
for (UIView *v in button.subviews) {
[v removeFromSuperview];
}
But I want to set the background image afterwards using
[button setBackgroundImage:[UIImage imageNamed:#"backgroundImage.png"] forState:UIControlStateNormal];
and nothing happens. If I do not remove all subviews than the previous code works.
So is it possivle that removing all subviews actually removes the backgroundImage as well, in which case, is it possible to put the backgroundImage back in?
Yes, according to what you experienced, the background image seems to be shown using a separate subview. Short answer: instead of raping poor view hierarchy (which is private anyway), you should keep track of the subviews you added yourself and remove only those.
Related
I want to have several buttons and other objects in a long UIScrollView in my app. In storyboard, I added a UIScrollView to fill the entre view, and then created an IBOutlet in my .h file. I synthesized the scroller in my .m file, and then used the following code to start the scroller:
#synthesize scroller = _scroller;
- (void)viewDidLoad
{
[super viewDidLoad];
[_scroller setScrollEnabled:YES];
[_scroller setContentSize:CGSizeMake(640, 3000)];
}
So now I need to know how to actually add things, such as buttons, to the area of the scroller that extends below what you can see in the view. My problem is that as I add butons to my view in storyboard, I can only add things to what you can see in the view, and therefore need to know how to add buttons to part that I will scroll to!
Hopefully this is clear. Thanks for all your help!
UPDATE
I have posted a screencast that walks through this technique step-by-step.
ORIGINAL
The easiest way to handle this is simply to make the view in your storyboard taller. When the app runs, any of the normal container view controllers (UINavigationController, UITabBarController, UISplitViewController, or even UIViewController when it's the root view controller of its window) will resize the view to fit on the screen and scroll.
Here's an example of how to set it up in Xcode:
I changed the view controller's size from “Inferred” to “Freeform”. Then I changed its view's height from 460 to 800. (By the way, control-shift-click gives you a menu of all objects under the cursor.)
Here's what happens when I run it in the simulator:
As you can see, the view hierarchy was resized to fit the screen, but the subviews of the UIScrollView weren't repositioned, and the scroll view set its content size appropriately. (That may only work properly with autolayout, though...)
So, an example to you how to add a Button:
UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[btn setTitle:#"Cool title" forState:UIControlStateNormal];
[btn setFrame:CGRectMake(50, 700, 100, 100)];
[btn addTarget:self action:#selector(action:) forControlEvents:UIControlEventTouchUpInside];
[_scroller addSubview:btn];
You just need to set the frame of the view that you want to add and after that add it as a subview in your scroll.
You can you use the Size inspector(Left part of xcode) in order to position it. or reposition it programmatically.
Cheers,
Kel
I want to have several buttons and other objects in a long UIScrollView in my app. In storyboard, I added a UIScrollView to fill the entre view, and then created an IBOutlet in my .h file. I synthesized the scroller in my .m file, and then used the following code to start the scroller:
#synthesize scroller = _scroller;
- (void)viewDidLoad
{
[super viewDidLoad];
[_scroller setScrollEnabled:YES];
[_scroller setContentSize:CGSizeMake(640, 3000)];
}
So now I need to know how to actually add things, such as buttons, to the area of the scroller that extends below what you can see in the view. My problem is that as I add butons to my view in storyboard, I can only add things to what you can see in the view, and therefore need to know how to add buttons to part that I will scroll to!
Hopefully this is clear. Thanks for all your help!
UPDATE
I have posted a screencast that walks through this technique step-by-step.
ORIGINAL
The easiest way to handle this is simply to make the view in your storyboard taller. When the app runs, any of the normal container view controllers (UINavigationController, UITabBarController, UISplitViewController, or even UIViewController when it's the root view controller of its window) will resize the view to fit on the screen and scroll.
Here's an example of how to set it up in Xcode:
I changed the view controller's size from “Inferred” to “Freeform”. Then I changed its view's height from 460 to 800. (By the way, control-shift-click gives you a menu of all objects under the cursor.)
Here's what happens when I run it in the simulator:
As you can see, the view hierarchy was resized to fit the screen, but the subviews of the UIScrollView weren't repositioned, and the scroll view set its content size appropriately. (That may only work properly with autolayout, though...)
So, an example to you how to add a Button:
UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[btn setTitle:#"Cool title" forState:UIControlStateNormal];
[btn setFrame:CGRectMake(50, 700, 100, 100)];
[btn addTarget:self action:#selector(action:) forControlEvents:UIControlEventTouchUpInside];
[_scroller addSubview:btn];
You just need to set the frame of the view that you want to add and after that add it as a subview in your scroll.
You can you use the Size inspector(Left part of xcode) in order to position it. or reposition it programmatically.
Cheers,
Kel
I would like to improve performance by making my views opaque where appropriate. I have a UIButton that is showing red in the simulator - it's only red around the text of the button, not the entire frame. In the Storyboard, I've enabled Opaque and changed the background color from clear to white, yet it still shows red in the simulator.
How do I change that to green so that it's fully opaque and not trying to work with transparency?
Note that UILabels are fully green when you change its background and opaque to YES.
I am use following code in your case:
[button.titleLabel setOpaque:YES];
[button.titleLabel setBackgroundColor:[UIColor whiteColor]];
// or which-you-want-color
Obviously, you should keep weak reference to your button.
Pretty works. Button size smaller than the screenshot size.
I believe the UIButton is made of a couple of views such as titleLabel. It may be possible to enumerate the UIButtons' subview and set them each to opaque.
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
for(UIView *subview in [button subviews]){
subview.opaque = YES;
}
I want to have several buttons and other objects in a long UIScrollView in my app. In storyboard, I added a UIScrollView to fill the entre view, and then created an IBOutlet in my .h file. I synthesized the scroller in my .m file, and then used the following code to start the scroller:
#synthesize scroller = _scroller;
- (void)viewDidLoad
{
[super viewDidLoad];
[_scroller setScrollEnabled:YES];
[_scroller setContentSize:CGSizeMake(640, 3000)];
}
So now I need to know how to actually add things, such as buttons, to the area of the scroller that extends below what you can see in the view. My problem is that as I add butons to my view in storyboard, I can only add things to what you can see in the view, and therefore need to know how to add buttons to part that I will scroll to!
Hopefully this is clear. Thanks for all your help!
UPDATE
I have posted a screencast that walks through this technique step-by-step.
ORIGINAL
The easiest way to handle this is simply to make the view in your storyboard taller. When the app runs, any of the normal container view controllers (UINavigationController, UITabBarController, UISplitViewController, or even UIViewController when it's the root view controller of its window) will resize the view to fit on the screen and scroll.
Here's an example of how to set it up in Xcode:
I changed the view controller's size from “Inferred” to “Freeform”. Then I changed its view's height from 460 to 800. (By the way, control-shift-click gives you a menu of all objects under the cursor.)
Here's what happens when I run it in the simulator:
As you can see, the view hierarchy was resized to fit the screen, but the subviews of the UIScrollView weren't repositioned, and the scroll view set its content size appropriately. (That may only work properly with autolayout, though...)
So, an example to you how to add a Button:
UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[btn setTitle:#"Cool title" forState:UIControlStateNormal];
[btn setFrame:CGRectMake(50, 700, 100, 100)];
[btn addTarget:self action:#selector(action:) forControlEvents:UIControlEventTouchUpInside];
[_scroller addSubview:btn];
You just need to set the frame of the view that you want to add and after that add it as a subview in your scroll.
You can you use the Size inspector(Left part of xcode) in order to position it. or reposition it programmatically.
Cheers,
Kel
I want to have several buttons and other objects in a long UIScrollView in my app. In storyboard, I added a UIScrollView to fill the entre view, and then created an IBOutlet in my .h file. I synthesized the scroller in my .m file, and then used the following code to start the scroller:
#synthesize scroller = _scroller;
- (void)viewDidLoad
{
[super viewDidLoad];
[_scroller setScrollEnabled:YES];
[_scroller setContentSize:CGSizeMake(640, 3000)];
}
So now I need to know how to actually add things, such as buttons, to the area of the scroller that extends below what you can see in the view. My problem is that as I add butons to my view in storyboard, I can only add things to what you can see in the view, and therefore need to know how to add buttons to part that I will scroll to!
Hopefully this is clear. Thanks for all your help!
UPDATE
I have posted a screencast that walks through this technique step-by-step.
ORIGINAL
The easiest way to handle this is simply to make the view in your storyboard taller. When the app runs, any of the normal container view controllers (UINavigationController, UITabBarController, UISplitViewController, or even UIViewController when it's the root view controller of its window) will resize the view to fit on the screen and scroll.
Here's an example of how to set it up in Xcode:
I changed the view controller's size from “Inferred” to “Freeform”. Then I changed its view's height from 460 to 800. (By the way, control-shift-click gives you a menu of all objects under the cursor.)
Here's what happens when I run it in the simulator:
As you can see, the view hierarchy was resized to fit the screen, but the subviews of the UIScrollView weren't repositioned, and the scroll view set its content size appropriately. (That may only work properly with autolayout, though...)
So, an example to you how to add a Button:
UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[btn setTitle:#"Cool title" forState:UIControlStateNormal];
[btn setFrame:CGRectMake(50, 700, 100, 100)];
[btn addTarget:self action:#selector(action:) forControlEvents:UIControlEventTouchUpInside];
[_scroller addSubview:btn];
You just need to set the frame of the view that you want to add and after that add it as a subview in your scroll.
You can you use the Size inspector(Left part of xcode) in order to position it. or reposition it programmatically.
Cheers,
Kel