I've seen some solutions, none of which have worked for my issue.
I have a UIButton created by simply drag/dropping into the UIViewController in Storyboard editor.
The UIButton has an outlet linked to the .h file for the UIViewController associated to that view. It is also Synthesized in the .m file.
#property (strong, nonatomic) IBOutlet UIButton *answerButton;
I want to change the location of the button during run time like this;
CGRect btFrame = answerButton.frame;
btFrame.origin.x = xOne;
btFrame.origin.y = yOne;
answerButton.frame = btFrame;
However whenever I try this, the button refuses to move.
All other editing functions (like setTitle etc) are functional, but for some reason the frame won't move how I want it to.
Simply uncheck "Use Autolayout" in the file inspector..
.h file
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController{
IBOutlet UIButton *theButton;
}
#property(nonatomic, strong) IBOutlet UIButton *theButton;
-(IBAction)moveTheButton:(id)sender;
#end
.m file
-(IBAction)moveTheButton:(id)sender{
CGRect btFrame = theButton.frame;
btFrame.origin.x = 90;
btFrame.origin.y = 150;
theButton.frame = btFrame;
}
This code moves the button from one point to another.
Replace your code by the below, which includes code to remove auto resizing mask.
CGRect btFrame = answerButton.frame;
btFrame.origin.x = xOne;
btFrame.origin.y = yOne;
answerButton.autoresizingMask = UIViewAutoresizingNone;
answerButton.frame = btFrame;
Related
I'm relatively new to Xcode, and am in the process of making an app in Objective C with several viewControllers each with a single UIScrollView containing a single UIImage that can be zoomed and scrolled.
This code works for the first image (dermatomes), but I can't figure out how to tweak the UIView to enable zooming and scrolling on the second image (anatomicPlanes). Currently the second image imports correctly to the second UIScrollView, but when I try to zoom it just jumps down and right and remains static there.
The size of the UIScrollViews were set using Interface Builder, no problems there.
viewController.h:
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController <UIScrollViewDelegate> {
IBOutlet UIScrollView *dermatomeScrollView;
UIImageView *dermatomesImageView;
IBOutlet UIScrollView *anatomicPlaneScrollView;
UIImageView *anatomicPlanesImageView;
}
#property (strong, nonatomic) IBOutlet UIScrollView *dermatomeScrollView;
#property (strong, nonatomic) IBOutlet UIImageView *dermatomesImageView;
#property (strong, nonatomic) IBOutlet UIImageView *anatomicPlanesImageView;
#property (strong, nonatomic) IBOutlet UIScrollView *anatomicPlaneScrollView;
#end
viewController.m
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize dermatomeScrollView, anatomicPlanesImageView, dermatomesImageView, anatomicPlaneScrollView;
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
return dermatomesImageView;
}
- (void)viewDidLoad {
[super viewDidLoad];
UIImageView *dermatomes = [[UIImageView alloc]
initWithImage:[UIImage imageNamed:#"dermatomes.jpg"]];
self.dermatomesImageView = dermatomes;
dermatomeScrollView. maximumZoomScale = 1.2;
dermatomeScrollView. minimumZoomScale = 0.4;
dermatomeScrollView. delegate = self;
[dermatomeScrollView addSubview:dermatomesImageView];
dermatomeScrollView.zoomScale = 0.6;
UIImageView *planes = [[UIImageView alloc]
initWithImage:[UIImage imageNamed:#"anatomic planes.jpg"]];
self.anatomicPlanesImageView = planes;
anatomicPlaneScrollView. maximumZoomScale = 1.2;
anatomicPlaneScrollView. minimumZoomScale = 0.4;
anatomicPlaneScrollView. delegate = self;
[anatomicPlaneScrollView addSubview:anatomicPlanesImageView];
anatomicPlaneScrollView.zoomScale = 0.6;
}
Any help is appreciated!
You need to return the correct view based on the scroll view that is requesting. Every method in the delegate pattern is passed a reference to the originator of the method call, so your delegate implementation can handle it differently. In this case, the originator of the delegate method call is the scroll view:
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
if (scrollView == dermatomeScrollView) {
return dermatomesImageView;
}
return anatomicPlanesImageView;
}
If you add more scrollviews, you'll have to extend this method further.
I need to subclass a UITabBarController so that I can completely replace the UITabBar view with a custom view that I can hopefully produce in the interface builder. I tried but am not succeeding.
First, I created a subclass of UITabBarController along with a xib. I deleted the default view in the xib, and replaced it with a new one that was only 60px tall (the size of my tabbar). I dragged the necessary buttons onto it, and configured the .h file like so:
#interface ToolbarViewController : UITabBarController
#property (strong, nonatomic) IBOutlet UIView *tabBarView;
#property (strong, nonatomic) IBOutlet UIButton* firstButton;
#property (strong, nonatomic) IBOutlet UIButton* secondButton;
#end
My xib looks like this:
When I launch the app, I see an empty space at the bottom made for the tab bar, but I am not seeing an actual tab bar:
Update: I realize that I'm not actually launching the xib file in the .m file. Anyone know how I can do this properly?
There are various different solutions for adding a custom set of buttons to a custom tab bar controller subclass. I've done it years ago following this guide: http://idevrecipes.com/2010/12/16/raised-center-tab-bar-button/.
The idea is to add a custom UIView over the tab bar of your UITabBarController subclass. The CustomTabBarController class doesn't have to have a xib. Instead, I have a subclass of UIView that can either be programmatically laid out, or created using a xib for a UIView. Here's the header file for my CustomTabBarView class:
#interface CustomTabBarView : UIView
{
CALayer *opaqueBackground;
UIImageView *tabBG;
IBOutlet UIButton *button0;
IBOutlet UIButton *button1;
IBOutlet UIButton *button2;
NSArray *tabButtons;
int lastTab;
}
#property (nonatomic, weak) id delegate;
-(IBAction)didClickButton:(id)sender;
You'll either connect the desired buttons to button0, button1, button2, etc in the xib file, or do it programmatically on init for the view. Note that this is the UIView subclass.
In CustomTabBarView.m:
-(IBAction)didClickButton:(id)sender {
int pos = ((UIButton *)sender).tag;
// or some other way to figure out which tab button was pressed
[self.delegate setSelectedIndex:pos]; // switch to the correct view
}
Then in your CustomTabBarController class:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
tabView = [[CustomTabBarView alloc] init];
tabView.delegate = self;
tabView.frame = CGRectMake(0, self.view.frame.size.height-60, 320, 60);
[self.view addSubview:tabView];
}
When the buttons are clicked in the CustomTabBarView, it will call its delegate function, in this case the CustomTabBarController. The call is the same function as if you clicked on a tab button in the actual tab bar, so it will jump to the tabs if you have set up the CustomTabBarController correctly like a normal UITabBarController.
Oh, on a slightly separate note, the correct way to add a custom xib as the interface for a subclass of UIView:
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
NSArray *subviewArray = [[NSBundle mainBundle] loadNibNamed:NSStringFromClass([self class]) owner:self options:nil];
UIView *mainView = [subviewArray objectAtIndex:0];
//Just in case the size is different (you may or may not want this)
mainView.frame = self.bounds;
[self addSubview:mainView];
}
return self;
}
In the xib file, make sure the File's Owner has its Custom class set as CustomTabBarView.
I am just start studying iOS developing watching Stanford iOS course, but it looks like I have already missing something.
I have a form with UILabel and UIButton. When an user press the button the title of the button must be added to the text of label.
Here is my current CalculatorViewController.h:
#import <UIKit/UIKit.h>
#interface CalculatorViewController : UIViewController
#property (weak, nonatomic) IBOutlet UILabel *display;
#end
and here is a CalculatorViewController.m:
#import "CalculatorViewController.h"
#implementation CalculatorViewController
#synthesize display = _display;
- (IBAction)digitPressed:(UIButton *)sender {
NSString *digit = [sender currentTitle];
UILabel *myDisplay = self.display;
myDisplay.text = [myDisplay.text stringByAppendingString:digit];
}
#end
The problem is that self.display (and myDisplay) variables have a nil value. Looks like I need to do something to link my variable with control on the form. What ?
Thanks in advance.
You need to link the control, the UILabel in Interface Builder to the variable in your CalculatorViewController class.
It is very likely that the file's owner (talking about the Xib file) is your CalculatorViewController, so you need to Control+drag the file's owner (or the object representing your VC) to the control and you will be shown a menu with the possible IBOutlet variables declared in your class, so you select the one you want to represent the control.
You can check if this link is properly set in two ways: (1) Select the UILabel in Interface Builder and see if there's a connection to the variable in the Connections Inspector, or (2) In your code you'll see a bullet near the IBOutlet declaration, if the bullet is hollow the connections is not set, if the bullet is filled the connection is set.
There is no need of this line
UILabel *myDisplay = self.display;
You have already declared your label in your interface file
- (IBAction)digitPressed:(UIButton *)sender
{
NSMutableString *string = [myDisplay.text stringByAppendingString:sender.titleLabel.text];
myDisplay.text = string;
}
I am using XCode 4.6.1 and developing for iOS 6.
I have added a button to the storyboard. I have created an outlet in my implementation file ViewController.m:
//
// ViewController.m
//
#import "ViewController.h"
#interface ViewController ()
#property (weak, nonatomic) IBOutlet UIButton *b1;
#end
I try to change the button b1's properties as follows (in this same file: ViewController.m):
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.b1.alpha = 0.5;
self.b1.frame = CGRectMake(0,0,123,412);
}
When I run the app in the simulator, the alpha of the button is successfully set to 0.5.
However, the position and size of the button doesn't change.
I have tried various ways to make it happen. However nothing seems to work. I would like to know what am I doing wrong. I am pretty new to Objective C. Any help would be greatly appreciated.
You are probably using autolayout:
When using autolayout you cannot manually change your outlets frames. You have two options: you can either disable autolayout (then your code should work), or create outlets to your constraints and then modify the constrains programmatically:
#property (weak, nonatomic) IBOutlet NSLayoutConstraint *widthConstraint;
and then in your code:
self.widthConstraint.constant = 123;
and so on with all the constraints that need to be modified.
I'm newbie in the iOS development and I'm working in a projecte that it uses iOS5 and Storyboarding. I would like to create a reusable component, like a button, with a custom view (inside the button there will be some images and labels, it will be a big button), to create some of them in the same view of a Storyboard.
So I've created a XIB file (ItemClothes.xib) with a UIButton and inside of it some UIImagesViews and a UILabel. Then I've created a subclass of UIButton (UIItemClothes.h and UIItemClothes.m), with properties for UIImageViews and UILabel components.
UIItemClothes.h
#import <UIKit/UIKit.h>
#import "SCClothes.h"
#interface UIItemClothes : UIButton
#property (nonatomic, strong) IBOutlet UIImageView *imageClothes;
#property (nonatomic, strong) IBOutlet UIActivityIndicatorView *loadingImage;
#property (nonatomic, strong) IBOutlet UIImageView *seasonIconClothes;
#property (nonatomic, strong) IBOutlet UIImageView *categoryIconClothes;
#property (nonatomic, strong) NSString *idClothes;
#property (strong, nonatomic) IBOutlet UILabel *lblProva;
#end
UIItemClothes.m
#import "UIItemClothes.h"
#implementation UIItemClothes
#synthesize imageClothes = _imageClothes;
#synthesize loadingImage = _loadingImage;
#synthesize seasonIconClothes = _seasonIconClothes;
#synthesize categoryIconClothes = _categoryIconClothes;
#synthesize idClothes = _idClothes;
#synthesize lblProva = _lblProva;
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
[self addSubview:[[[NSBundle mainBundle] loadNibNamed:#"ItemClothes" owner:self options:nil] objectAtIndex:0]];
}
return self;
}
#end
Then in the .XIB file I've set the class of UIButton as UIItemClothes, and make the relationships between XIB's UI components and my class properties.
So, after that, in the Storyboard, in the ViewController of one view I've written this code:
UIItemClothes *item = [[UIItemClothes alloc] initWithFrame:CGRectMake(0.0, 0.0, 200.0, 200.0)];
item.lblProva.text = #"test!";
[item.categoryIconClothes setImage:iconCategory];
item.seasonIconClothes.image = iconSeason;
[cell addSubview:item];
As you see, this component will be inside a TableViewCell, and the idea is to put more components (UIItemClothes) inside of it.
The problem is that the component is drawed but any outlet is set as I do in the code above.
Can anyone help me?
Thanks!
well, the problem has been resolved... Instead of having a custom subclass of UIButton, there will be needed a ViewController with all Outlets. Then in the other ViewController (StoryBoard) is initialized this new ViewController