Problem with a method to modify the transparency of a Label UILabel

Question

HI
I Have create a small project which can modify the brightness ( or the transparency ) of a label
UIlabel
So the code
File .m
ControlBoxCookeAppDelegate.m
Code :
Code:
*// ControlBoxCookeAppDelegate.m*
*// Control Box Cooke*
*// Created by Bruno on 1/11/10.*
*// Copyright _MyCompanyName_ 2010. All rights reserved.*
*#import "SerialManager.h"*
*#import "ControlBoxCookeAppDelegate.h"*
*#import "PickerViewController.h"*
*#include <fcntl.h>*
*#include "Led.h"*
*@implementation ControlBoxCookeAppDelegate*
*@synthesize window;*
*- (void)applicationDidFinishLaunching:(UIApplication *)application {*
*// Override point for customization after application launch*
*[window makeKeyAndVisible];*
//RootViewController.m
*- (void)applicationDidFinishLaunching:(UIApplication *)application {*
* pvController = [[PickerViewController alloc] initWithNibName:@"pickerview"/@"MainWindow"*//@"Control Box Cooke"//*@"PickerView"/ bundle:[NSBundle mainBundle]];*
* Led_Operateur= [[Led alloc] initWithFrame:CGRectMake(20,50,280,20)];*
* Led_Operateur.text=@" ";*
* [Led_Operateur setBackgroundColor: [ UIColor colorWithWhite:1.0 alpha: 0.5]];*
* [pvController.view addSubview:Led_Operateur];*
* [window addSubview:pvController.view];*
* // Override point for customization after application launch*
* [window makeKeyAndVisible];*
*- (void)dealloc {*
* [Led_Operateur release];*
* [pvController release];*
*[window release];*
*[super dealloc];*
-(void)Modifie_luma:(CGFloat)luma
* pvController = [[PickerViewController alloc] initWithNibName:@"pickerview" bundle:[NSBundle mainBundle]];*
* Led_Operateur= [[UILabel alloc] initWithFrame:CGRectMake(20,50,280,20)];*
* Led_Operateur.text=@" ";*
* [Led_Operateur setBackgroundColor: [ UIColor colorWithWhite:1.0 alpha: luma]];*
* [pvController.view addSubview:Led_Operateur];*
* [window addSubview:pvController.view];*
* [window makeKeyAndVisible];*
@end
file.h
Code :
Code:
*// ControlBoxCookeAppDelegate.h*
*// Control Box Cooke*
*// Created by Bruno on 1/11/10.*
*// Copyright _MyCompanyName_ 2010. All rights reserved.*
*#import <UIKit/UIKit.h>*
*#import "SerialManager.h"*
*#import "led.h"*
*@class PickerViewController;*
*@interface ControlBoxCookeAppDelegate : NSObject <UIApplicationDelegate> {*
*UIWindow window;
* PickerViewController pvController;
* SerialManager portCunima;
* int portin,portout; // numero de port de com in-out*
* UILabel Led_Operateur;
-(void)Modifie_luma:(CGFloat)luma;
*@property (nonatomic, retain) IBOutlet UIWindow window;
@end
To the initialization no problem my label UILabel display itself very well with the transparency
of 50% ( alpha=0.5)
But when I modify this transparency with a button, in my window iPhone
the program call the method Modifie_Luma witch is the class
ControlBoxCookeAppDelegate
the program go on to this method, (I have fixe a breakpoint) but impossible to various this transparency.
So if I change in method (void)applicationDidFinishLaunching
the transparency
example alpha =0,5 => alpha =0,8
Code :
Code:
* [Led_Operateur setBackgroundColor: [ UIColor colorWithWhite:1.0 alpha: 0.8]];*
this example go on
resume
when I change the transparency in the method
(void)applicationDidFinishLaunching it 's OK
when I change the transparency in the method
-(void)Modifie_luma it's not OK
Have you an explanation ?

Answer 1

So the code , sorry but no marker for the code in post
How do you do ?
// ControlBoxCookeAppDelegate.h
// Control Box Cooke
// Created by Bruno on 1/11/10.
// Copyright _MyCompanyName_ 2010. All rights reserved.
#import <UIKit/UIKit.h>
#import "SerialManager.h"
#import "led.h"
@class PickerViewController;
@interface ControlBoxCookeAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
PickerViewController *pvController;
SerialManager *portCunima;
int portin,portout; // numero de port de com in-out
UILabel *Led_Operateur;
-(void)Modifie_luma:(CGFloat)luma;
@property (nonatomic, retain) IBOutlet UIWindow *window;
@end
// ControlBoxCookeAppDelegate.m
// Control Box Cooke
// Created by Bruno on 1/11/10.
// Copyright _MyCompanyName_ 2010. All rights reserved.
#import "SerialManager.h"
#import "ControlBoxCookeAppDelegate.h"
#import "PickerViewController.h"
#include <fcntl.h>
#include "Led.h"
@implementation ControlBoxCookeAppDelegate
@synthesize window;
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// Override point for customization after application launch
[window makeKeyAndVisible];
//RootViewController.m
- (void)applicationDidFinishLaunching:(UIApplication *)application {
pvController = [[PickerViewController alloc] initWithNibName:@"pickerview"/@"MainWindow"*//@"Control Box Cooke"//*@"PickerView"/ bundle:[NSBundle mainBundle]];
Led_Operateur= [[Led alloc] initWithFrame:CGRectMake(20,50,280,20)];
Led_Operateur.text=@" ";
[Led_Operateur setBackgroundColor: [ UIColor colorWithWhite:1.0 alpha: 0.5]];
[pvController.view addSubview:Led_Operateur];
[window addSubview:pvController.view];
Led *ZoneA;
CGRect Dimension;
ZoneA = [[Led alloc]initWithFrame:Dimension];
[pvController.view addSubview:ZoneA];
[window addSubview:pvController.view];
[ZoneA Modifie_luma:0.5];
[ZoneA release];
// Override point for customization after application launch
[window makeKeyAndVisible];
Led *Led1;
CGRect frame;
Led1=[[Led alloc] initWithFrame:frame];
[pvController.view addSubview:Led1];
[window addSubview:pvController.view];
[Led1 release];
[label release];
[Error_message release];
[path_port release];
- (void)dealloc {
[Led_Operateur release];
[pvController release];
[window release];
[super dealloc];
-(void)Modifie_luma:(CGFloat)luma
pvController = [[PickerViewController alloc] initWithNibName:@"pickerview" bundle:[NSBundle mainBundle]];
Led_Operateur= [[UILabel alloc] initWithFrame:CGRectMake(20,50,280,20)];
Led_Operateur.text=@" ";
[Led_Operateur setBackgroundColor: [ UIColor colorWithWhite:1.0 alpha: luma]];
[pvController.view addSubview:Led_Operateur];
[window addSubview:pvController.view];
[window makeKeyAndVisible];
@end