Re: Looking at self = [super init].
Re: Looking at self = [super init].
- Subject: Re: Looking at self = [super init].
- From: Michael David Crawford <email@hidden>
- Date: Mon, 01 Jun 2015 15:33:51 -0700
I've always used "m" to prefix ivars: mSpeed, mDistance. I use "s"
for statics and "k" for constants.
I'd like to find a good convention for distinguishing properties but
haven't really found one that is appealing to me.
Michael David Crawford, Consulting Software Engineer
email@hidden
http://www.warplife.com/mdc/
Available for Software Development in the Portland, Oregon Metropolitan
Area.
On Mon, Jun 1, 2015 at 3:14 PM, Charles Srstka <email@hidden> wrote:
> On Jun 1, 2015, at 4:52 PM, Britt Durbrow <email@hidden> wrote:
>>
>> I don't use underscores to prefix ivars. I think it's ugly, and unnecessary -- it doesn't help with namespacing (if a subclass and a superclass both declare _someVariable with the underscore they will collide just as badly as if they declare someVariable without one)
>
> Which is not at all, actually:
>
> #import <Foundation/Foundation.h>
>
> @interface Foo : NSObject
>
> - (void)fooLogAnIvar;
>
> @end
>
> @interface Bar : Foo
>
> - (void)barLogAnIvar;
>
> @end
>
> int main(int argc, const char * argv[]) {
> @autoreleasepool {
> Bar *bar = [Bar new];
>
> [bar fooLogAnIvar];
> [bar barLogAnIvar];
> }
> return 0;
> }
>
> @implementation Foo {
> NSString *_anIvar;
> }
>
> - (instancetype)init {
> self = [super init];
>
> if (self == nil) {
> return nil;
> }
>
> _anIvar = @"Foo";
>
> return self;
> }
>
> - (void)fooLogAnIvar {
> NSLog(@"Foo: _anIvar is %@", _anIvar);
> }
>
> @end
>
> @implementation Bar {
> NSString *_anIvar;
> }
>
> - (instancetype)init {
> self = [super init];
>
> if (self == nil) {
> return nil;
> }
>
> _anIvar = @"Bar";
>
> return self;
> }
>
> - (void)barLogAnIvar {
> NSLog(@"Bar: _anIvar is %@", _anIvar);
> }
>
> @end
>
> 2015-06-01 17:12:16.328 test[17203:2499855] Foo: _anIvar is Foo
> 2015-06-01 17:12:16.329 test[17203:2499855] Bar: _anIvar is Bar
>
>> and ivars vs accessors are obvious by context: [self obviouslyAnAccessor] or self.obviouslyAnAccessor vs obviouslyAnIvar (or very rarely, someObject->obviouslyAnIvar).
>
>
> Non-underscored ivars vs. local variables, however, are not obvious at all, especially if the method is large.
>
> Charles
>
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