CODEWITHSUNDEEP
objective-c
Baral
Baral

Reputation: 3141

Objective C - NSMutableArrays - For each

I would like to know if there is a better way to set each objects in a NSMutableArray a property value ?

//player.h
@interface Player : NSObject
@property BOOL isEliminated;

//test.h
@property NSMutableArray *players;

//test.m
for(Player *p in self.players)
{
    p.isEliminated = NO;
}

I am pretty new to xCode and I have a C# background. I know C# & Linq can provide a non-loop solution.. I would like to know if this is also possible with Objective C

I search here and there... All I could found is a way to get objects from array where property X equals somevalue..

Upvotes: 0

Views: 83

Answers (3)

Greg
Greg

Reputation: 25459

You can use makeObjectsPerformSelector: method on NSMutableArray to set change value of all object in NSMutableArray:

[self.players makeObjectsPerformSelector:@selector(setIsEliminated:) withObject:@NO];

Upvotes: 0

Adam Wright
Adam Wright

Reputation: 49386

Well, you can create one loopless solution with blocks and NSArrays - (void)enumerateObjectsUsingBlock:(void (^)(id obj, NSUInteger idx, BOOL *stop))block message. Something like:

[self.players enumerateObjectsUsingBlock:^(Player *p, NSUInteger idx, BOOL *stop) {
    p.isEliminated = NO;
}];

However, this is hardly more readable. Using a loop for this type of work is, in my opinion, fine.

Upvotes: 0

Martin R
Martin R

Reputation: 540105

With Key-Value Coding:

[self.players setValue:@NO forKey:@"isEliminated];

sets the property on each element of the array.

Note that even though the property is a (scalar) BOOL, you have to use the Objective-C number object @NO here. It is automatically "translated" to NO when setting the property.

Upvotes: 6

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