How to add objects in NSMutableArray with for loop?

Question

Here, the issue is nothing but I don't know much about objectiveC. So the query is that I am working on a project where user taps on Image and with UITapGestureRecognizer I have to store that tapped position in my array. I don't know how is this possible that every time user taps the view and CGPoint value gets stored in NSMutableArray.

dataArray = [[NSMutableArray alloc] init];
for (NSInteger i = 0; i < [getResults count]; i++) {

[dataArray addObject:tappedPoint];
NSLog(@"RESULT TEST %@", dataArray);
}

THIS answers your question. You will have to try it yourself. — Schrodingrrr
– Schrodingrrr, Commented Aug 2, 2014 at 6:05

Brian Tracy · Accepted Answer · 2014-08-02 06:32:28Z

1

You need to subclass UIView and implement the method - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event to get a touch callback. Second, a touch location (CGPoint) cannot be added to an NSMutableArray, but a wrapper class for it can (NSValue). Here would be a very basic implementation of what you are going for.

// in UIView subclass
// Precondition: you have an NSMutableArray named `someMutableArray'
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    CGPoint touchLocation = [[touches anyObject] locationInView:self];
    NSValue *wrapper = [NSValue valueWithCGPoint:touchLocation];

    [someMutableArray addObject:wrapper];
}

If you want to loop through these touch locations later, all you have to to is fast enumerate through the array and unwrap the NSValues.

for (NSValue *wrapper in someMutableArray) {
    CGPoint touchLocation = [wrapper CGPointValue];
}

edited Aug 2, 2014 at 6:32

answered Aug 2, 2014 at 6:26

Brian Tracy

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4 Comments

Sushil Sharma Over a year ago

Thanks Brian Tracy, you mean that i don't need to implement any for loop,right?

Brian Tracy Over a year ago

@SushilSharma No, unless you want to loop through all of the touch locations later.

Sushil Sharma Over a year ago

Ok,so with this code it will add objects one after another,every time user taps the view.

Sushil Sharma Over a year ago

Thanks Brian Tracy,thanks a lot for your great solution.

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