#implementation Fruit{
-(void) setWeight: (int)a{
weight=a;
}
-(void) setType:t{
Type=t;
}
-(void) setName:n{
name=n;
}
the error is in the 2nd line shown. i tried the show invisible spaces trick and it didnt work.
You've got an open bracket { next to your implementation, delete that and make sure your file ends in #end
Edit: The other problems are
You're writing your setters incorrectly. You need to provide a type like you did for setWeight int, for the type and name.
If you're going to make your own setters it needs to be _type = t, and _name = n
I just wrote this code and it builds without issue:
#interface Fruit : NSObject
#property (nonatomic) int weight;
#property (nonatomic, strong) NSString *type;
#property (nonatomic, strong) NSString *name;
#end
#import "Fruit.h"
#implementation Fruit
-(void) setWeight: (int)a{
_weight=a;
}
-(void) setType:(NSString *)t{
_type=t;
}
-(void) setName:(NSString *)n{
_name=n;
}
#end
You don't need brackets around your #implementation. Instead, you just need to put a #end after it
#implementation Fruit
...
#end
Related
I moved my app to XCode 6 and found this problem. I have NSObject and it stopped returning objects when initialized, I use XCode 6 iPhone 6 Simulator.
My .h file:
#import <Foundation/Foundation.h>
#interface RBGAlpha : NSObject{
NSString *red;
NSString *blue;
NSString *green;
NSString *alpha;
}
#property (nonatomic, retain) NSString *red;
#property (nonatomic, retain) NSString *blue;
#property (nonatomic, retain) NSString *green;
#property (nonatomic, retain) NSString *alpha;
-(id)initWithName:(NSString *)r bl:(NSString *)b gr:(NSString *)g al:(NSString *)a;
#end
my .m file
#import "RBGAlpha.h"
#implementation RBGAlpha
#synthesize red,blue,green,alpha;
-(id)initWithName:(NSString *)r bl:(NSString *)b gr:(NSString *)g al:(NSString *)a{
self = [super init];
if (self) {
self.red = r;
self.blue = b;
self.green = g;
self.alpha = a;
}
return self;
}
#end
I use something like this in viewDidLoad method to create my objects:
RBGAlpha *tmpObj=[[RBGAlpha alloc] initWithName:#"0.01" bl:#"0.01" gr:#"0.01" al:#"1.00"];
However, while running the app in Simulator iPhone 6 this returns nothing
Has anybody dealt with that kind of problem?
I think that you're being mislead. There is indeed a value, that is what 0x786... in the value field means.
Summary saying 0 objects is confusing. I cannot understand why it would say that, but I bet if you typed po tmpObj into LLDB it would not return nil but the address showing next to "Value".
If you want to see something more interesting from the Xcode debugger consider implementing debugQuickLookObject.
On a side note, you can omit the definition of your instances variables in
#interface RBGAlpha : NSObject{
NSString *red;
NSString *blue;
NSString *green;
NSString *alpha;
}
And you also don't need to #synthesize each of them anymore, the compiler included with Xcode 5 and up does this for you.
I have a window with a large NSTextFeildCell, where text can be modified. Upon clicking a button another window appears where the text from the original window can be used some how. The issue I am having is when I attempt to retrieve that text the log spits out...
" -[NSTextView stringValue]: unrecognized selector sent to instance 0x100151860"
Fallowed by a long trace...
I have tried to solve this several different ways but with no luck.
currently,
First window controller
.h
#import <Cocoa/Cocoa.h>
#class NextWindowController;
#interface TextViewWindowController : NSWindowController
#property (nonatomic, weak) NextWindowController *NextWindow;
#property (nonatomic, weak) IBOutlet NSTextFieldCell *txtTextView;
- (IBAction)btnClicked:(id)sender;
- (NSString*)getText;
#end
.m
#import "TextViewWindowController.h"
#import "NextWindowController.h"
#implementation TextViewWindowController
#synthesize NextWindow;
- (IBAction)btnClicked:(id)sender{
[NextWindow setCallingWindow:self];
[NextWindow showWindow:self];
}
- (NSString*)getText{
return [_txtTextView stringValue];// there is a problem with the view...
}
#end
Next Window controller
.h
#import <Cocoa/Cocoa.h>
#class TextViewWindowController;
#interface NextWindowController : NSWindowController{
NSMutableString* str;
}
#property (nonatomic, weak) TextViewWindowController *callingWindow;
#end
.m
#import "NextWindowController.h"
#import "TextViewWindowController.h"
#implementation NextWindowController
#synthesize callingWindow;
- (IBAction)btnEnterClicked:(id)sender{
[str setString:callingWindow.txtTextView.stringValue];
}
- (id)initWithWindow:(NSWindow *)window{
self = [super initWithWindow:window];
if (self) {
str = [[NSMutableString alloc] init];
}
return self;
}
#end
I have also tried str = [callingWindow getText] with the same result.
Any help would be very appreciated!
It's not super intuitive to figure out from Apple's documentation, but to get the raw string value of a NSTextView (which inherits from NSText), just use:
[_txtTextView string];
And since you're using properties, it might be smarter to use the accessor in your function, like this:
- (NSString*)getText{
return [self.txtTextView string];
}
Right before my model class sends the variable stringToDisplay, NSLog shows me that it has a value. But when I try to use it in my ViewController, I just get (null). Any thoughts about what I'm doing wrong?
(The good news is that, while working on this, I had sort of a breakthrough in understanding how models and controllers relate to each other. I'm still a complete newbie, but I don't feel quite as lost as I did.)
Here's what I think is the relevant code:
CalculatorBrain.h
#import <Foundation/Foundation.h>
#interface CalculatorBrain : NSObject
#property (nonatomic) NSMutableString *stringToAdd;
#property (nonatomic,strong) NSString *stringForDisplay;
- (double)performOperation:(NSString *)operation withArray:(NSMutableArray *)particularStackYouNeedToPopOff;
CalculatorBrain.m
#implementation CalculatorBrain
#synthesize stringToAdd = _stringToAdd;
#synthesize stringForDisplay = _stringForDisplay;
#synthesize whatHappenedSinceLastClear = _whatHappenedSinceLastClear;
- (double)performOperation:(NSString *)operation withArray:(NSMutableArray *)particularStackYouNeedToPopOff
{
<long code that I think doesn't matter because this NSLog produces exactly what I want it to:>
NSLog(#"%#",stringForDisplay);
return result;
}
CalculatorViewController.h
#import <UIKit/UIKit.h>
#interface CalculatorViewController : UIViewController
#property (nonatomic) NSArray *arrayOfDictionaries;
#property (nonatomic) NSDictionary *dictionary;
#property (weak, nonatomic) IBOutlet UILabel *variablesUsed;
#property (nonatomic, strong) NSString *operation;
#end
CalculatorViewController.m
#import "CalculatorViewController.h"
#import "CalculatorBrain.h"
#interface CalculatorViewController ()
#property (nonatomic,strong) CalculatorBrain *brain;
#end
#implementation CalculatorViewController
#synthesize display = _display;
#synthesize history = _history;
#synthesize brain = _brain;
#synthesize operation = _operation;
- (IBAction)operationPressed:(UIButton *)sender
{
NSString *otherString=[self.brain stringForDisplay];
if (self.userIsEnteringNumber) [self enterPressed];
NSString *operation = sender.currentTitle;
double result = [self.brain performOperation:operation withArray:[self.brain whatHappenedSinceLastClear]];
self.display.text = [NSString stringWithFormat:#"%g",result];
self.history.text = otherString;
NSLog(#"%#",otherString);
}
And the NSLog in that last line of code give me (null).
Any thoughts?
Maybe I'm missing something but your property is declared in the class extension of CalculatorBrain so nobody outside CalculatorBrain.m knows about this property.
So if you want to expose this property to other objects, you will have to declare it in CalculatorBrain.h instead.
Oh - your declaration of the property whatHappenedSinceLastClear isn't exposed to other classes that import CalculatorBrain.h because you put the property declaration in an interface extension in the .m file, which other classes will not see.
To make it publicly accessible move the #property line for whatHappenedSinceLastClear to CalculatorBrain.h, not the .m file.
I can guess that problem lies in the way you assign your stringForDisplay, eg.:
if you use something like
stringForDisplay_ = anotherString;
setter for property doesn't fire, so you have to retain your variable yourself otherwise it'll live just until your method finishes;
If so - use property setters, eg.:
self.stringForDisplay = anotherString;
that way ARC will do all the memory management.
It really depends how you set stringForDisplay inside the performOperation:withArray: method.
for a blind guess, try using
NSString *otherString = self.brain.stringForDisplay;
after this line
double result = [self.brain performOperation:operation withArray:[self.brain whatHappenedSinceLastClear]];
I've just starting out with obj-c and I created 2 files, a .h and a .m file. The .h file is..
#import <Foundation/Foundation.h>
#interface CardUnit : NSObject
{
#private
NSString *_name;
NSString *_gold;
}
#property (nonatomic, assign) NSString *name;
#property (nonatomic, assign) NSString *gold;
#end
and the .m file is
#import "CardUnit.h"
#implementation CardUnit
#synthesize gold = _gold;
#synthesize name = _name;
#end
But it's giving me 2 errors on the #synthesize lines, which are...
"Existing ivar "_gold" for property gold with assign attribute must be __unsafe retained" and the same for name.
From the error i see you are using ARC, Automatic Reference Counting .
Basically you can get rid of all the #synthesize statements and even the private declarations of the ivar's name and gold is not necessary.
All you need is the CardUnit.h to be like this :
#interface CardUnit : NSObject
#property (assign) NSString *name;
#property (assign) NSString *gold;
#end
The Xcode compiler will take care of the rest.
See also this reply on SO
So I have a class with a NSInteger in it and now I want to return the NSInteger value. For some kind of reason, the code for that is not working. I have already declared the #property for the NSInteger class.
#property (readwrite, assign, nonatomic) NSInteger numberFun;
- (NSInteger)sampleMethod {
...
return sample.numberFun;
}
The compiler says "Return from pointer without a cast". I'm pretty sure that means that I'm using a C type for an objective-c method. I want to know the work around for this. (Though I don't want it to return a casted NSInteger as a NSNumber).
Thanks
The following code sample compiles fine. I suggest you present a more complete example of your problem so we can figure out what you are doing wrong.
#interface MyObject : NSObject
{ }
#property (readwrite, assign, nonatomic) NSInteger numberFun;
#end
#implementation MyObject
#synthesize numberFun;
#end
#interface MyObject2 : NSObject
{ }
#property (nonatomic, copy) MyObject* sample;
#end
#implementation MyObject2
#synthesize sample;
- (NSInteger)sampleMethod { return sample.numberFun; }
#end