Using a string as name to set property values

Question

I have these big huge repetitive chunks of code in my project I am attempting to shrink them down. Take this piece example:

self.Day11.delegate = (id)self;
self.Day12.delegate = (id)self;
self.Day13.delegate = (id)self;
self.Day14.delegate = (id)self;
self.Day15.delegate = (id)self;
self.Day16.delegate = (id)self;
self.Day17.delegate = (id)self;
self.Day18.delegate = (id)self;
self.Day19.delegate = (id)self;

What I would like to do is make it that I can use a for loop or something similar to shrink it down like this:

   for (int i = 1 ; i<=9; i++) {
    NSString *var = [NSString stringWithFormat:@"Day1%d",i];

    self.var.delegate = (id)self;

}

I know this doesn't work is there a possible way to do something like this?

It sounds like you need an array. Also, those casts to (id) are superfluous and horrible. — user529758
– user529758, Commented Jan 18, 2014 at 21:42

nhgrif · Accepted Answer · 2014-01-19 15:42:59Z

4

No, no, no.

@property (nonatomic,strong) NSArray *arrayOfDays;

Now get rid of all those day objects and fill that self.arrayOfDays with whatever all those individual day objects are...

Then...

for(int i=0; i<[self.arrayOfDays count]; ++i) {
    [[self.arrayOfDays objectAtIndex:i] setDelegate: self];
}

Or even better, if all those objects are of the same type (I'll assume they're of type Day), we can do:

for(Day *day in self.arrayOfDays) {
    day.delegate = self;
}

Best (per Daij-Dan's comment):

[self.arrayOfDays setValue:self forKeyPath:@"delegate"];

edited Jan 19, 2014 at 15:42

answered Jan 18, 2014 at 21:43

nhgrif

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3 Comments

user1953754 Over a year ago

Thank you, this is exactly what I was looking for! Sorry for bad code I am new to objective-c.

user1953754 Over a year ago

Wait, using the second way I get the yellow flag assigning to 'id uitextfielddelegate ' from incompatible type *const __strong'

Daij-Djan Over a year ago

1 line only :: setValue:forKeyPath: [self.arrayOfDays setValue:self forKeyPath:@"delegate"];

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