In my application I have a UISlider where file.h is:
#interface Mapa : UIViewController {
UILabel *label;
UISlider *slider;
}
#property(nonatomic, retain) IBOutlet UILabel *label;
#property(nonatomic, retain) IBOutlet UISlider *slider;
-(IBAction)sliderValueChanged:(UISlider *)sender;
-(IBAction) OpenList:(id)sender;
-(IBAction) OpenMap:(id)sender;
And file.m:
#synthesize label;
#synthesize slider;
-(IBAction)sliderValueChanged:(UISlider *)sender {
label.text = [NSString stringWithFormat:#"%f", sender.value];
}
- (void)dealloc {
[super dealloc];
[label release];
[slider release];
}
done this to me uislider goal of the label, I get the number that's out on the label bound to the UISlider, another screen to call a map, how this value label step to the other screen?
thanks
Assuming your 'other screen' is another UIViewController, then after instantiating the new UIViewController, you would set the parameters on the new UIViewController before calling either pushViewController or presentModalViewController.
If you're using a UIStoryboard then you can set the parameters of the new view controller in 'prepareForSegue'. See this question How to pass prepareForSegue: an object for details.
Related
I am having issues when I want to assign UIPicker as inputView of UITextField. It shows error " Assignement to readonly property". Please help as I think it is not related to property sythesizing.
I have added my code below:
#interface DriverWaitingDetails : UIViewController<UITextFieldDelegate,UIPickerViewDataSource, UIPickerViewDelegate>
{
IBOutlet UILabel *baseLabel;
IBOutlet UITableView *driverTableView;
IBOutlet UIPickerView *basePicker;
}
#property(nonatomic, retain) IBOutlet UIPickerView *basePicker;
#property(nonatomic,retain)IBOutlet UILabel *baseLabel;
#property(nonatomic,retain)IBOutlet UITableView *driverTableView;
#end
Implementation Code:-
-(void)viewDidLoad
{
basePicker=[[UIPickerView alloc] initWithFrame:CGRectMake(0,100,320, 500)];
self.navigationItem.title=#"Driver Table";
baseLabel.userInteractionEnabled = YES;
basePicker.delegate = self;
basePicker.dataSource = self;
[basePicker setShowsSelectionIndicator:YES];
baseLabel.inputView=nil;
[super viewDidLoad];
}
Attached Screenshot:-
You are setting the input view of UILabel.
You declared baseLabel as UILabel not UITextField.
IBOutlet UILabel *baseLabel;
You have declared
IBOutlet UILabel *baseLabel;
UILabel inherits from UIView : UIResponder : NSObject and the property is defined in UIResponder:
#property (readonly, retain) UIView *inputView
As the property inputView is read only, you cannot assign any value to it.
Here is the situation. I have a view controller titled "MyViewController." Within this view controller I have a text editing feature that uses subclassed buttons. The name of the UIButton Subclass is "ColorSwatch"
I have setup delegate/protocol methods in the "ColorSwatch.h" subclass as follow.
// ColorSwatch.h
#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#import <QuartzCore/QuartzCore.h>
#protocol ColorSwatchDelegate <NSObject>
- (void)fontColor:(UIColor *)color;
#end
#interface ColorSwatch : UIButton {
id <ColorSwatchDelegate> colorSwatchDelegate;
CAGradientLayer *gradient;
UIView *currentView;
UIColor *fontColor;
}
#property (nonatomic, retain) id <ColorSwatchDelegate> colorSwatchDelegate;
#property (nonatomic, retain) CAGradientLayer *gradient;
#property (nonatomic, retain) UIView *currentView;
#property (nonatomic, retain) UIColor *fontColor;
#end
Now in my "ColorSwatch.m" I have:
// ColorSwatch.m
#import "ColorSwatch.h"
#import <QuartzCore/QuartzCore.h>
#import "MyViewController.h"
#implementation ColorSwatch
#synthesize gradient;
#synthesize currentView;
#synthesize colorSwatchDelegate;
#synthesize fontColor;
-(void)setupView{
"Makes the subclassed buttons pretty"
}
-(id)initWithFrame:(CGRect)frame{
if((self = [super initWithFrame:frame])){
}
return self;
}
-(id)initWithCoder:(NSCoder *)aDecoder{
if((self = [super initWithCoder:aDecoder])){
[self setupView];
MyViewController *mvc = [[MyViewController alloc] initWithNibName:
#"MyViewController" bundle:nil];
self.colorSwatchDelegate = mvc;
}
return self;
}
-(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
[self magnify:view];
fontColor = view.backgroundColor;
[self.colorSwatchDelegate fontColor:fontColor];
}
- (void)magnify:(UIView *)view
{
}
- (void)dealloc
{
[currentView release];
[gradient release];
[fontColor release];
[super dealloc];
}
#end
In the "MyViewController.h" I have:
// MyViewController.h
#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>
#import "ColorSwatch.h"
#interface MyViewController : UIViewController <ColorSwatchDelegate> {
UITextField *photoLabelTextField;
}
#property (nonatomic, retain) IBOutlet UITextField *photoLabelTextField;
#end
In the "MyViewController.m" I have:
- (void)fontColor:(UIColor *)color
{
NSLog(#"Selected Font Color");
[self.photoLabelTextField setTextColor:color];
}
Now the delegate method sort of works, meaning when I tap on a color button the
NSLog(#"Selected Font Color");
message gets fired. But the problem is that I cannot change the
[self.photoLabelTextField setTextColor:color];
property. I have tried numerous ways of changing the property, the only thing that I can do is send NSLogs, anything I try to change a property in the "MyViewController" Class nothing happens.
If anyone could please help me out, I would appreciate it.
Thank you
The problem is that the ColorSwatch is sending delegate messages to a dangling instance of MyViewController that it incorrectly allocated in it's initWithCoder: method.
UIControls shouldn't allocate ViewControllers to be their delegates... it goes the other way around.
Delete these lines...
// in ColorSwatch.m initWithCoder:
MyViewController *mvc = [[MyViewController alloc] initWithNibName:
#"MyViewController" bundle:nil];
self.colorSwatchDelegate = mvc;
Then, in MyViewController.m ...
- (void)viewDidLoad {
ColorSwatch *colorSwatchButton = [[ColorSwatch alloc] buttonWithType:UIButtonTypeCustom];
// or place a ColorSwatch in the xib, on MyViewController's view... But not before you
// you delete lines from initWithCoder, otherwise it's infinite circular allocation
colorSwatchButton.frame = CGRectMake(/* ... */);
colorSwatchButton addTarget:self action:#selector(csButtonPressed:) forControlEvent: UIControlEventTouchUpInside];
// and so on...
// now the important part:
colorSwatchButton.colorSwatchDelegate = self;
// see - the ViewController is in charge of allocation, sets itself up as the delegate
[self.view addSubview:colorSwatchButton];
}
Instead of building the button in code, you can use IB.
Step 1: make the delegate an outlet...
#property (nonatomic, retain) IBOutlet id <ColorSwatchDelegate> colorSwatchDelegate;
Step 2: draw the buttons in IB, and set their class to ColorSwatch.
Then you can skip the code I wrote in viewDidLoad.
Step 3: The newly placed button should now present an outlet in IB. You can drag from that to the MyViewController as you normally do.
There might be a connection problem in your IBOutlet photoLabelTextField, you may have forgotten to connect xib text field with your photoLabelTextField
please help me to resolve this issue
i have a view controller in a navigation stack named firstviewcontroller
FirstViewController.h
#class ImperialPickerController;
#class FractionPickerController;
#class MetricPickerController;
#interface FirstViewController : UIViewController {
UIView *pickerViewContainer;
ImperialPickerController *ImperialPickerController;
FractionPickerController *FractionPickerController;
MetricPickerController *MetricPickerController;
UIView *ImperialPickerViewContainer;
UIView *FractionPickerViewContainer;
UIView *MetricPickerViewContainer;
UISegmentedControl *segmentedControl;
NSInteger selectedUnit;
}
#property(nonatomic,retain) IBOutlet UIView *pickerViewContainer;
#property(nonatomic,retain) IBOutlet UIView *ImperialPickerViewContainer;
#property(nonatomic,retain) IBOutlet UIView *FractionPickerViewContainer;
#property(nonatomic,retain) IBOutlet UIView *MetricPickerViewContainer;
#property(nonatomic,retain) IBOutlet ImperialPickerController *ImperialPickerController;
#property(nonatomic,retain) IBOutlet FractionPickerController *FractionPickerController;
#property(nonatomic,retain) IBOutlet MetricPickerController *MetricPickerController;
#property(nonatomic,retain) IBOutlet UISegmentedControl *segmentedControl;
-(IBAction)toggleUnit;
#end
FirstViewController.m
#implementation FirstViewController
#synthesize ImperialPickerController;
#synthesize FractionPickerController;
#synthesize MetricPickerController;
#synthesize ImperialPickerViewContainer;
#synthesize FractionPickerViewContainer;
#synthesize MetricPickerViewContainer;
#synthesize pickerViewContainer;
#synthesize segmentedControl;
define METRIC_INDEX 0
define IMPERIAL_INDEX 1
define FRACTION_INDEX 2
-(IBAction)toggleUnit
{
selectedUnit = [segmentedControl selectedSegmentIndex];
if (selectedUnit == METRIC_INDEX)
{
[MetricPickerController updateLabel1];
}
}
#end
MetricPickerController.h
#interface MetricPickerController : NSObject <UIPickerViewDataSource,UIPickerViewDelegate> {
UIPickerView *pickerView;
UILabel *label;
}
#property(nonatomic,retain)UIPickerView *pickerView;
#property(nonatomic,retain)UILabel *label;
-(void)updateLabel1;
#end
MetricPickerController.m
import "MetricPickerController.h"
#implementation MetricPickerController
#synthesize pickerView;
#synthesize label;
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 2;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
return 10;
}
-(void)updateLabel1
{
label.text = #"test"
}
the problem is that i get an error message on compiling here in the firstviewcontroller
-(IBAction)toggleUnit
{
selectedUnit = [segmentedControl selectedSegmentIndex];
if (selectedUnit == METRIC_INDEX)
{
[MetricPickerController updateLabel1]; <<<<< (MetricPickerController might not respond to +updateLabel1)!!
also if i click the toggle in IB xcode will crash with sigbart error
}
can anyone please help and advise what i have done wrong i think i have everything hooked up properly so i guess this is to do with my method declaration somehow
i know the code is incomplete at this stage but its driving me crazy trying to get rid of this error and i hope you can appreciate that i am just a learner
}
The problem is that updateLabel1 is an instance method, and you are sending it to a class (the +updateLabel1 instead of -updateLabel1 in the error message tells you this).
Since you've named your instance variables the same as the classes, you should be able to solve this by writing
[self.MetricPickerController updateLabel1];
instead - this makes it clear to the compiler you are referring to the instance variable and not the actual class.
I'm diving into iPad development and I'm still learning how everything works together. I understand how to add standard view (i.e. buttons, tableviews, datepicker, etc.) to my UI using both Xcode and Interface Builder, but now I'm trying to add a custom calendar control (TapkuLibrary) to the left window in my UISplitView application which doesn't involve Interface Builder, right? So if I have a custom view (in this case, the TKCalendarMonthView), how do I programmatically add it to one of the views in my UI (in this case, the RootViewController)? Below are some relevant code snippets from my project...
RootViewController interface
#interface RootViewController : UITableViewController <NSFetchedResultsControllerDelegate> {
DetailViewController *detailViewController;
NSFetchedResultsController *fetchedResultsController;
NSManagedObjectContext *managedObjectContext;
}
#property (nonatomic, retain) IBOutlet DetailViewController *detailViewController;
#property (nonatomic, retain) NSFetchedResultsController *fetchedResultsController;
#property (nonatomic, retain) NSManagedObjectContext *managedObjectContext;
- (void)insertNewObject:(id)sender;
TKCalendarMonthView interface
#class TKMonthGridView,TKCalendarDayView;
#protocol TKCalendarMonthViewDelegate, TKCalendarMonthViewDataSource;
#interface TKCalendarMonthView : UIView {
id <TKCalendarMonthViewDelegate> delegate;
id <TKCalendarMonthViewDataSource> dataSource;
NSDate *currentMonth;
NSDate *selectedMonth;
NSMutableArray *deck;
UIButton *left;
NSString *monthYear;
UIButton *right;
UIImageView *shadow;
UIScrollView *scrollView;
}
#property (readonly,nonatomic) NSString *monthYear;
#property (readonly,nonatomic) NSDate *monthDate;
#property (assign,nonatomic) id <TKCalendarMonthViewDataSource> dataSource;
#property (assign,nonatomic) id <TKCalendarMonthViewDelegate> delegate;
- (id) init;
- (void) reload;
- (void) selectDate:(NSDate *)date;
Thanks in advance for all your help! I still have a ton to learn, so I apologize if the question is absurd in any way. I'm going to continue researching this question right now!
Assuming you have initialized the custom UIView, you need to add it as a subview of the viewController's view.
- (void)addSubview:(UIView *)view
So an example would be if you have a plain viewController called myVC, which has simply a blank white UIView as its view, you would say this:
CGRect customViewsFrame = CGRectMake(10, 30, 5, 2);
MyCustomView *myView = [[MyCustomView alloc] initWithFrame:customViewsFrame];
[[myVC view] addSubview:myView];
[myView release]; //Since you called "alloc" on this, you have to release it too
Then it will show up in the viewController's view, taking up the space indicated by the CGRect.
The CGRect's coordinates specify a location in the local coordinate system of the superview you are adding to, if I'm not mistaken.
CGRect CGRectMake (CGFloat x, CGFloat y, CGFloat width, CGFloat height);
I'm not booted into Mac OS X so I can't verify this completely, but this is your general pattern:
RootViewController.h:
...
#interface RootViewController : UITableViewController <NSFetchedResultsControllerDelegate>
{
...
TKCalendarMonthView* calendarView;
...
}
...
#property (nonatomic, retain) TKCalendarMonthView* calendarView;
...
RootViewController.m:
...
#synthesize calendarView;
...
- (void)dealloc
{
...
[calendarView release];
...
}
...
- (void)viewDidLoad
{
...
TKCalendarMonthView* aCalendarView = [[TKCalendarMonthView alloc] init]; // <-- possibly initWithFrame here
self.calendarView = aCalendarView;
[aCalendarView release];
[self addSubview:self.calendarView];
...
}
I have a login controller ,and after the successful login i want to pass some string value to the menu page.however it does not work.the application crashes.
I have tried possible suggesstion of Ihuk and SAM from the link below
how to pass a string value from one view controller to another view controller
loginController.h:
#import <UIKit/UIKit.h>
#class RootViewController;
#class Menu;
#interface LoginController : UIViewController {
UIButton *login_Button;
UITextField *username_TextField;
UITextField *password_TextField;
RootViewController *mc1;
UINavigationController *navigationController;
Menu *mv1;
}
#property(nonatomic,retain) IBOutlet UIButton *login_Button;
#property(nonatomic,retain) IBOutlet UITextField *username_TextField;
#property(nonatomic,retain) IBOutlet UITextField *password_TextField;
#property(nonatomic,retain) RootViewController *mc1;
#property (nonatomic, retain) IBOutlet
UINavigationController *navigationController;
#property(nonatomic,retain)Menu *mv1;
- (IBAction)Login_Method:(id)sender;
-(id)initWithUserName:(NSString *)name ;
#end
loginController.m
#import "LoginController.h"
#import "Menu.h"
#import "ViewController.h"
#import "RootViewController.h"
#implementation LoginController
#synthesize mc1,mv1;
#synthesize login_Button,username_TextField,password_TextField;
#synthesize navigationController;
// Implement viewDidLoad to do additional setup after
// loading the view, typically from a nib.
- (void)viewDidLoad {
if (![self.navigationController isNavigationBarHidden])
[self.navigationController setNavigationBarHidden:YES animated:NO];
//[self presentModalViewController:navigationController animated:YES];
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (IBAction)Login_Method:(id)sender
{
Menu *mv2 = [[Menu alloc] initWithUserName:#"Menu" bundle:nil];
//mv2.l1.text=#"aa"; //i tried this, but not work,so created initWithUserName
self.mv1=mv2;
[self presentModalViewController:mv1 animated:YES];
// [RootViewController release];
}
-(id)initWithUserName:(NSString *)name
{
self = [super init];
if (nil == self) {
return nil;
}
// display or store login info somewhere
[mv1.l1 setText:name];
return self;
}
-(BOOL)textFieldShouldReturn:(UITextField *)theTextField {
[theTextField resignFirstResponder];
return YES;
}
- (void)dealloc {
[username_TextField release];
[password_TextField release];
[super dealloc];
}
#end
Menu.h
#import <UIKit/UIKit.h>
#class Menu;
#interface Menu : UIViewController {
UILabel *l1;
UIButton *AccountSummary_Button;
UIButton *PayOffQuote_Button;
UIButton *PayBill_Button;
UIButton *Logout_Button;
UINavigationController *nv1;
}
#property(nonatomic,retain) IBOutlet UILabel *l1;
#property(nonatomic,retain) IBOutlet UIButton *AccountSummary_Button;
#property(nonatomic,retain) IBOutlet UIButton *PayOffQuote_Button;
#property(nonatomic,retain) IBOutlet UIButton *PayBill_Button;
#property(nonatomic,retain) IBOutlet UIButton *Logout_Button;
#property (nonatomic, retain) IBOutlet UINavigationController *nv1;
-(IBAction)ViewAccountSummary_method:(id)sender;
-(IBAction)ViewPayOffQuote_method:(id)sender;
-(IBAction)ViewPayBill_method:(id)sender;
-(IBAction)Logout_method:(id)sender;
#end
Menu.m
Make a property in your application delegate, for example, an NSString* called myString.
Then access it from the login controller and other controllers like so:
[[UIApplication sharedApplication] delegate].myString
You could, for example, set myString's value in the login controller:
[[UIApplication sharedApplication] delegate].myString = #"value";
You could read it in any other controller:
NSLog(#"myString is: %#", [[UIApplication sharedApplication] delegate].myString);
Additionally, some Cocoa style tips:
Do not capitalize class members (AccountSummary_Button etc.)
Do not capitalize class methods (ViewAccountSummary_method etc.)
The only thing you should capitalize are the classes themselves (Menu etc.).