ios - self.property = self.property in objective c -


good morning, looking through old code online in objective c , having trouble finding out following means.

the class subclassing uiview , following uiscrollviewdelegate protocol. following class method have questions about:

@property(nonatomic, strong) nsdate * _nonnull date;  - (void)layoutsubviews {     [super layoutsubviews];      if(!self.pagingview) {         uiscrollview *pagingview = [[uiscrollview alloc] initwithframe:self.bounds];         pagingview.pagingenabled = yes;         pagingview.directionallockenabled = yes;         pagingview.delegate = self;         [pagingview setautoresizingmask:uiviewautoresizingflexiblewidth | uiviewautoresizingflexibleheight];         [self addsubview:pagingview];         self.pagingview = pagingview;     }      cgrect f = self.pagingview.bounds;     cgsize s = self.pagingview.contentsize;     if(s.width != f.size.width * 3) {         self.date = self.date;         } }

first, not sure [super layoutsubviews] achiving , not sure self.date = self.date trying do. setting itself? if so, not able work swift. (which trying convert code to)

https://github.com/daij-djan/ddcalendarview/blob/master/ddcalendarview_objc/ddcalendarview.m

thanks again help;

looking @ code posted, setdate: method performing view setup, doing self.date = self.date; author's way of forcing setup done without changing set date. better done if view setup code factored out of setdate:, make call setup after new date set. in above code, call setup method, updatedateviews or along lines.

as question code calling [super layoutsubviews];, idea time override method call superclass implementation, unless know sure superclass implementation , know don't need call it, , in rare cases don't want call it. rule of thumb add call superclass method. it's same when override viewwillappear:, viewwilldisappear:, etc. should calling superclass implementation those.


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