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I want to override the getter and setter in my ObjC class using ARC.
.h File
@property (retain, nonatomic) Season *season; .m File
@synthesize season; - (void)setSeason:(Season *)s { self.season = s; // do some more stuff } - (Season *)season { return self.season; } Am I missing something here?
478
The getter method returns the value of the attribute. The setter method takes a parameter and assigns it to the attribute. Getters and setters allow control over the values.
Getters and setters are methods used to declare or obtain the values of variables, usually private ones. They are important because it allows for a central location that is able to handle data prior to declaring it or returning it to the developer.
Getters give you a way to define a property of an object, but they do not calculate the property's value until it is accessed. A getter defers the cost of calculating the value until the value is needed.
Properties. Properties are the variables (to be more precise, member variables) that are declared inside a class but outside the method. Kotlin properties can be declared either as mutable using the “var” keyword or as immutable using the “val” keyword. By default, all properties and functions in Kotlin are public.
Yep, those are infinite recursive loops. That's because
self.season = s; is translated by the compiler into
[self setSeason:s]; and
return self.season; is translated into
return [self season]; Get rid of the dot-accessor self. and your code will be correct.
This syntax, however, can be confusing given that your property season and your variable season share the same name (although Xcode will somewhat lessen the confusion by coloring those entities differently). It is possible to explicitly change your variable name by writing
@synthesize season = _season; or, better yet, omit the @synthesize directive altogether. The modern Objective-C compiler will automatically synthesize the accessor methods and the instance variable for you.
164
If you are going to implement your own getter and setter, you'll need to maintain an internal variable:
@synthesize season = _season; - (void)setSeason:(Season *)s { // set _season //Note, if you want to retain (as opposed to assign or copy), it should look someting like this //[_season release]; //_season = [s retain]; } - (Season *)season { // return _season } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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