i have this variables (int and double-array)
.h-File
#interface MyCLass : NSObject
{
int myInt;
double paramStack[100];
}
#property (nonatomic, assign) int myInt;
//#property (nonatomic, assign) double paramStack; //<- ?
.m-File
#synthesise myInt;
//#synthesize paramStack; //<- ?
I want the int and the double-array-variable accessible from other classes via properties.
For the int-var. it looks fine, but the array throws errors at .m-file (#synthsize) and at h.file (#property (nonatomic, assign) double paramStack).
How can i define
"#property (nonatomic, assign) double paramStack;" as a double-array?
Thanks
Make the property with a pointer:
#property(nonatomic, assign) double *paramStack;
You can just use it like this:
NSLog(#"%f", self.paramStack[20]);
This is mainly because an array cannot be returned, but a pointer can. I.E. this getter would be impossible and that's why you cannot create an array property:
- (double[100])paramStack;
Related
I am writing a unit test to test a method that updates a checklist. The checklist has these properties:
typedef NS_ENUM (NSUInteger, ChecklistStatus) { Pending, Completed };
#protocol IChecklistItem <NSObject>
#property (nonatomic, assign, readonly) NSInteger Id;
#property (nonatomic, copy, readonly) NSString *Description;
#property (nonatomic, assign, readonly)BOOL IsCompleted;
#property (nonatomic, assign, readwrite) ChecklistStatus Status;
#property (nonatomic, strong, readwrite) NSDate *CompletedDate;
#property (nonatomic, copy, readwrite) NSString *CompletedByUserId;
#property (nonatomic, assign, readonly) NSInteger RoleId;
#property (nonatomic, assign, readonly) NSInteger GroupId;
#property (nonatomic, strong, readonly) NSArray<IChecklistNote> *Notes;
- (void)sortNotes;
#end
However, in my unit test, as I am trying to validate,
checklistItem.Description = #"hello";, I get the error"Assignment to readonly property"
Why is this so?
heres the rest of my test method:
- (void)testUpdateChecklist {
NSString *testChecklistId = #"1";
NSString *testPatientDescription = #"Descriptive Description";
// What other properties do I need here?
XCTAssertNotNil(_service);
__block CCChecklistItem *checklistItem = nil;
SignalBlocker *blocker = [[SignalBlocker alloc] initWithExpectedSignalCount:1];
id delegate = OCMProtocolMock(#protocol(ChecklistServiceDelegate));
OCMExpect([delegate didCompleteUpdateChecklistItem:[OCMArg checkWithBlock:^BOOL(id obj) {
checklistItem = obj;
XCTAssertNotNil(checklistItem);
[blocker signal];
return true;
}]]);
[_service updateChecklistItem:checklistItem delegate:delegate];
[blocker waitWithTimeout:5.0f];
OCMVerifyAll(delegate);
NSString *originalDescription = checklistItem.Description;
checklistItem.Description = #"hello";
}
EDITED QUESTION:
So when I change the property from above to ReadWrite, I get this error in CChecklistItem
#interface CCChecklistItem ()
#property (nonatomic, assign, readwrite) NSInteger Id;
#property (nonatomic, copy, readwrite) NSString *Description;
#property (nonatomic, assign, readwrite) NSInteger RoleId;
#property (nonatomic, assign, readwrite) NSInteger GroupId;
#property (nonatomic, strong, readwrite) NSMutableArray<IChecklistNote> *Notes;
#end
`Illegal redeclaration of readwrite property in class extension 'CChecklistItem'
Your property is set to readonly as seen here:
#property (nonatomic, copy, readonly) NSString *Description;
Change it to:
#property (nonatomic, copy) NSString *Description;
or if you want to be consistent with the other properties (though overly explicit, IMO):
#property (nonatomic, copy, readwrite) NSString *Description;
Changing scope visibility only to satisfy tests is not encouraged. The easiest solution in your case would be to take advantage of wonderful KVO which Objective-C gives you.
Translated to your original question it would be something like:
[checklistItem setValue:#"hello" forKey:#"Description"]
No need to change access modifiers and your tests will be fine.
Your property is declared readonly in the protocol that the class CChecklistItem conforms. When that property is then synthersized it will create the backing variable and a getter method -(NSString *)description; but no setter method, since it is readonly. So redeclaring it as readwright in your anonymous category, that i'm guessing is declared in your test file to expose private methods to the test case, won't work since there still is no setter method for the property. Further more, even if you decide to try to make your own setter in the implementation of a category on your class you can't since there is no way to access the variable _description that is only exposed in the CChecklistItem.m file.
Depending on what you need to do with your test it might work to stub the getter - (NSString *)description; and return your #"hello" string when that method is called instead of trying to set the actual value to the backing variable.
Is there any macro for NSUInteger implemented in cocos2d-x for use in visual c++. I need this to port a project from obj-c to c++.
And also , I have seen these variables written after the declaration of the variables in the header file :
#property (nonatomic, readonly) CGPoint stickPosition;
#property (nonatomic, readonly) float degrees;
#property (nonatomic, readonly) CGPoint velocity;
#property (nonatomic, assign) BOOL autoCenter;
#property (nonatomic, assign) BOOL isDPad;
#property (nonatomic, assign) BOOL hasDeadzone;
#property (nonatomic, assign) NSUInteger numberOfDirections;
#property (nonatomic, assign) float joystickRadius;
#property (nonatomic, assign) float thumbRadius;
#property (nonatomic, assign) float deadRadius;"
Is there use in writing these in any way in c++ and is it possible? If so How?
NSUInteger is just the biggest-sized unsigned integer. In C++, you can use
unsigned long // when building a 64-Bit OS app
unsinged int // when building a 32-Bit OS app (ie iOS, Android)
instead of it. Or, to make it convenient:
typedef unsigned long NSUInteger;
typedef unsigned int NSUInteger;
If you want to represent a property in C++, that doesn't really belong to this topic - it's not Cocoa-dependent but language-dependent, simply solvable by reading the topic on member variables of a C++ book. Here's how:
class Whatever {
public:
CGRect rect;
}
then access it like:
Whatever *instance = new Whatever();
CGRect r = instance->rect;
I am getting the following error
Expected '{' before 'extern'
while using a third party header file and it has the following code
extern NSString *const kXXXError;
Is the usage related to Xcode version as currently i am using Xcode4
extern NSString *const kDeviceErrorDomain;
extern const NSInteger kDeviceErrorCodeUnknown;
#class DeviceInsightInternal;
#interface Device : NSObject {
DeviceInternal *_internal;
}
- (id)init;
- (NSString*)collect:(NSError**)error;
#property (nonatomic, assign) BOOL allowsJavascript;
#property (nonatomic, assign) BOOL privacyEnabled;
#end
You cannot declare a scalar property to have a any sort of retain,assign,copy semantic, it will result in a compile error. You should change:
#property(nonatomic, assign) BOOL allowsJavascript;
#property (nonatomic, assign) BOOL privacyEnabled;
to
#property(nonatomic) BOOL allowsJavascript;
#property (nonatomic) BOOL privacyEnabled;
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
I'm getting a NSObject doesNotRecognizeSelector error when trying to set a property and I'm not sure why.
The error occurs on the first line of setWithNSColor. I'm a bit confused how a property that's properly synthesized could be not recognized.
#interface ScopeColor : NSObject {
NSString *colorIntegerString;
float redColor;
float greenColor;
float blueColor;
NSString *name;
}
#property (readwrite, assign) NSString *colorIntegerString;
#property (readwrite, assign) float redColor;
#property (readwrite, assign) float greenColor;
#property (readwrite, assign) float blueColor;
#property (readwrite, assign) NSString *name;
-(void)setWithNSColor:(NSColor *)inColor
{
self.redColor=[inColor redComponent];
self.greenColor=[inColor greenComponent];
self.blueColor=[inColor blueComponent];
}
Are you sure it is your class and not NSColor that is raising the exception? If the NSColor object does not belong to the NSCalibratedRGBColorSpace or NSDeviceRGBColorSpace asking for redComponent, etc. will raise an exception.
Are you synthesizing redColor, greenColor, and blueColor somewhere outside of the included code? Also, primitive values (such as floats) don't need the assign keyword.