failure of alloc and Init - ios

Question

So perhaps this is a beginner's mistake and super easy to you guys, but i really do not know how to solve it,really appreciate for any suggestions:
Right Now:
1: I have to ViewController: EnterCommandViewController and DetectionViewController
2: I wrote Delegate protocol in EnterCommandViewController and set DetectionViewController as its delegate.
3: About delegate: I have a inputTextField in the EnterCommandView and a "Save" bar button item on the top toolbar in this view. Once I click the save , current view will be dismissed and return back to DetectionView and show the NSString just entered in the UILabel in DetectionView.
Finally, My question is that Why After I alloc and init a EnterCommandViewController instance , that is enterCVS, the instance is still nil as show in end of my post.
Code:
EnterCommandViewController.h
#import <UIKit/UIKit.h>
#import "RscMgr.h"
#protocol EnterCommandDelegate <NSObject>
#optional
-(void) commandEntered:(NSString*)command;
#end
#interface EnterCommandViewController : UIViewController <RscMgrDelegate,EnterCommandDelegate>
{
RscMgr* rscMgr;
IBOutlet UITextField *inputTextField;
// DetectionViewController* detectionViewController;
// __unsafe_unretained id<EnterCommandDelegate> delegate;
}
-(void)sendMessage:(NSString*)message;
-(id)initWithDelegate:(id)delegateToBe;
- (IBAction)cancelPressed;
- (IBAction)savePressed;
#property (nonatomic,weak) id<EnterCommandDelegate> delegate; //assign replaced
#end
EnterCommandVIewController.m
#import "EnterCommandViewController.h"
#import "DetectionViewController.h"
#interface EnterCommandViewController () <UITextFieldDelegate>
{
#private
BOOL connected;
}
#end
#implementation EnterCommandViewController
#synthesize delegate;
- (void)viewDidLoad {
[super viewDidLoad];
rscMgr = [[RscMgr alloc] init];
[rscMgr setDelegate:self];
// Do any additional setup after loading the view, typically from a nib.
[inputTextField becomeFirstResponder];
}
-(id)initWithDelegate:(id)delegateToBe{
if(self = [super init]){
delegate = delegateToBe;
}
return self;
}
-(void) viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
inputTextField.delegate = self;
}
-(void) viewWillDisappear:(BOOL)animated{
[super viewWillDisappear:animated];
inputTextField.delegate = nil;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - UITextFieldDelegate Methods
-(BOOL) textFieldShouldReturn:(UITextField *)textField{
[self sendMessage:textField.text];
textField.text = nil;
return NO;
}
#pragma mark - Serial Tx/Rx Methods Implementation
-(void) sendMessage:(NSString *)message{
if(connected == YES) {
[rscMgr writeString:message];
}
else{
NSLog(#"CableDisconnected!");
NSLog(#"Attempted To Send: %#",message);
}
}
- (IBAction)cancelPressed {
[self dismissViewControllerAnimated:YES completion:^{}];
}
- (IBAction)savePressed {
//is anyone listening
if([[[UIDevice currentDevice]systemVersion] compare:#"7.0" options:NSNumericSearch] != NSOrderedAscending){
NSLog(#"SYStem version > 7.0");
}
if(delegate&&[delegate respondsToSelector:#selector(commandEntered:)]){
NSLog(#"SomeMethod is listening");
[delegate commandEntered:inputTextField.text];
}
[self dismissViewControllerAnimated:YES completion:nil]; //commened: ^{}
}
#pragma mark - RscMgrDelegate Methods Implementation
-(void) cableConnected:(NSString *)protocol{
inputTextField.text = #"cableConnected";
[rscMgr setBaud:9600];
[rscMgr open];
connected = YES;
}
-(void) cableDisconnected{
inputTextField.text = #"cableDisconnected";
connected = NO;
}
-(void) readBytesAvailable:(UInt32)length{}
-(void) portStatusChanged{}
#end
DetectionViewController.h
#import <UIKit/UIKit.h>
#import "EnterCommandViewController.h"
#interface DetectionViewController : UIViewController <EnterCommandDelegate>{
}
- (IBAction)showSettings:(UIBarButtonItem *)sender;
#property (nonatomic, strong) EnterCommandViewController* enterCVC;
#property (nonatomic, strong) IBOutlet UILabel *showReceivedCommand;
#end
DetectionViewController.m
#import <Foundation/Foundation.h>
#import "DetectionViewController.h"
#import "EnterCommandViewController.h"
#implementation DetectionViewController
#synthesize showReceivedCommand;
#synthesize enterCVC;
- (IBAction)showSettings:(UIBarButtonItem *)sender {
}
-(void) viewDidLoad{
[super viewDidLoad];
if(showReceivedCommand){
showReceivedCommand.text=#"Initial text";
NSLog(#"UILAbel in ViewDidload is not nil");
}else {
NSLog(#"UILAbel in viewDidload is nil");
}
enterCVC = [[EnterCommandViewController alloc] init];
if(enterCVC.delegate) NSLog(#"X nil");
[enterCVC setDelegate:self];
}
#pragma mark - EnterCommandDelegate function(s)
-(void)commandEntered:(NSString *)command{
dispatch_async(dispatch_get_main_queue(), ^{
if(showReceivedCommand){
NSLog(#"UILabel is not nil");
}else{NSLog(#"UILabel is nil");}
showReceivedCommand = [[UILabel alloc] init];
NSLog(#"command received: %#",command);
showReceivedCommand.text = command;
[showReceivedCommand setNeedsDisplay];
NSLog(#"text in showReceivedCommand is %#",showReceivedCommand.text);
});
}
#end
I set a break point at DetectionViewController.n --> ViewDidLoad() --> [enterCVC setDelegate:self];
I got:
self DetectionViewController * 0x15c50e850 0x000000015c50e850
UIViewController UIViewController
showReceivedCommand UILabel * 0x15c510650 0x000000015c510650
enterCVC EnterCommandViewController * 0x15c611360 0x000000015c611360
showReceivedCommand UILabel * 0x15c510650 0x000000015c510650
enterCVC EnterCommandViewController * 0x15c611360 0x000000015c611360
UIViewController UIViewController
rscMgr RscMgr * nil 0x0000000000000000
inputTextField UITextField * nil 0x0000000000000000
connected BOOL NO false
delegate id 0x0 0x0000000000000000

Answer 1

enterCVC = [[EnterCommandViewController alloc] init]
Try changing that to....
enterCVC = [[EnterCommandViewController alloc] initWithDelegate:self];