How to make your own delegate method? - iphone

Question

I am trying to make my own delegate method for this I declare 'Mydelegate' protocol in forDelegate.h file.
#protocol Mydelegate <NSObject>
-(void)show:(NSString *)msg;
#end
then in my first viewController I make the property for this.I declare a method clickMe which is call on button press,that button is present in my firstviewcontroller .xib file.
#class SecondViewController;
#interface ViewController : UIViewController
{
id <Mydelegate> delegate1;
SecondViewController *secondController;
}
#property (assign) id <Mydelegate> delegate1;
-(IBAction)clickMe:(id)sender;
#end
and then after I adopt this protocol in my second view controller and define the method of this protocol
SecondViewController.h file
#class ViewController;
#interface SecondViewController : UIViewController <Mydelegate>
{
ViewController *viewController;
}
SecondViewController.m file
-(void)show:(NSString *)msg
{
NSLog(#"in delegate mathod");
}
-(void)viewDidLoad
{
viewController =[[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
viewController.delegate1=self;
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
Program is running but Mydelegate method 'show' is not call.

Answer 1

This will be a useful answer for your question.

Answer 2

In the implementation of ViewController, you should call the delegate's method..
-(IBAction)clickMe:(id)sender
{
[self.delegate1 show:#"Your String Param"];
}

Answer 3

Create one button on second view controller xib and connect method to that button then after click that button check your console.
#class ViewController;
#interface SecondViewController : UIViewController <Mydelegate>
{
ViewController *viewController;
}
-(IBAction)showmsg;
SecondViewController.m file
-(void)show:(NSString *)msg
{
NSLog(#"in delegate mathod");
}
-(IBAction)showmsg
{
[self show:];
}
-(void)viewDidLoad
{
viewController =[[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
viewController.delegate1=self;
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}

Answer 4

#protocol CPUPerformanceDelegate <NSObject>
-(void)getUsedCpuOperations:(float)percent;
-(void)getKernelCpuOperations:(float)percent;
-(void)getIdleCpuOperations:(float)percent;
-(void)getUserCpuOperations:(float)percent;
-(void)getNiceCpuOperations:(float)percent;
#end
#interface CPUPerformance : NSObject{
processor_info_array_t cpuInfo, prevCpuInfo;
mach_msg_type_number_t numCpuInfo, numPrevCpuInfo;
unsigned numCPUs;
NSLock *CPUUsageLock;
}
#property(nonatomic,assign)id<CPUPerformanceDelegate>delegate;
#property(nonatomic,retain)NSTimer *updateTimer;
#end
Then
#import "CPUPerformance.h"
#implementation CPUPerformance
#synthesize delegate,updateTimer;
- (void)updateInfo
{
idlepercent = ((idle/total)*100);
userpercent = (user/total)*100;
syspercent = (sys/total)*100;
nicepercent = (nice/total)*100;
inUsepercent = (inUse/total)*100;
[delegate getIdleCpuOperations:idlepercent];
[delegate getKernelCpuOperations:syspercent];
[delegate getNiceCpuOperations:nicepercent];
[delegate getUsedCpuOperations:inUsepercent];
[delegate getUserCpuOperations:userpercent];
}
and finally
#import "CPUPerformance.h"
#interface SpecProjectFirstViewController : UIViewController<UITableViewDataSource,UITableViewDelegate,CPUPerformanceDelegate>{
//Ivars
NSMutableArray *processArray;
//User Interface Object
UILabel *cpuUsage;
UILabel *cpuIdle;
UILabel *cpuUser;
UILabel *cpuNice;
UILabel *cpuKernel;
IBOutlet UITableView *tableViews;
CPUPerformance *cpuObject;
}
=================
#import "SpecProjectFirstViewController.h"
#implementation SpecProjectFirstViewController
-(void)getIdleCpuOperations:(float)percent{
[cpuIdle setText:nil];
[cpuIdle setText:[NSString stringWithFormat:#"Idle :%.0f %%",percent]];
[cpuIdle setTextAlignment:UITextAlignmentCenter];
}
-(void)getKernelCpuOperations:(float)percent{
[cpuKernel setText:nil];
[cpuKernel setText:[NSString stringWithFormat:#"Kernel :%.0f %%",percent]];
[cpuKernel setTextAlignment:UITextAlignmentCenter];
}
-(void)getNiceCpuOperations:(float)percent{
[cpuNice setText:nil];
[cpuNice setText:[NSString stringWithFormat:#"Nice :%.0f %%",percent]];
[cpuNice setTextAlignment:UITextAlignmentCenter];
}
-(void)getUsedCpuOperations:(float)percent{
[cpuUsage setText:nil];
[cpuUsage setText:[NSString stringWithFormat:#"Used :%.0f %%",percent]];
[cpuUsage setTextAlignment:UITextAlignmentCenter];
}
-(void)getUserCpuOperations:(float)percent{
[cpuUser setText:nil];
[cpuUser setText:[NSString stringWithFormat:#"User :%.0f %%",percent]];
[cpuUser setTextAlignment:UITextAlignmentCenter];
}
-(void)viewDidAppear:(BOOL)animated{
cpuObject = [[CPUPerformance alloc]init];
cpuObject.delegate = self;
[self creatObjectsOnView];
[super viewDidAppear:animated];
}