如何循环通过CGPoints数组

Question

I have created an array of 16 CGpoints representing 16 positions on a game board. This is how i set up the array CGPoint cgpointarray[16]; I would like to create a for loop to cycle through each item in the array and check if the touch is within x distance of a position (i have the position as a CGPoint. I don't have much experiance with xcode or objective c. I know the python equivalent would be

 for (i in cgpointarray){
        //Stuff to do
    }

How would i accomplish this? Thanks

Answer 1

for (int i = 0; i < 16; i++){
        CGPoint p = cgpointarray[i];
        //do something
    }

Or if you want to use the NSArray Class:

NSMutableArray *points = [NSMutableArray array];

[points addObject:[ NSValue valueWithCGPoint:CGPointMake(1,2)]];

for(NSValue *v in points) {
       CGPoint p = v.CGPointValue;

        //do something
}

( not tested in XCode )

Answer 2

This should do it:

for (NSUInteger i=0; i < sizeof(cgpointarray)/sizeof(CGPoint); i++) {
    CGPoint point = cgpointarray[i];

    // Do stuff with point
}

Answer 3

I would normally go for the NSValue approach above but sometimes you are working with an API where you can't change the output. @Andrews approach is cool but I prefer the simplicity of .count:

NSArray* arrayOfStructyThings = [someAPI giveMeAnNSArrayOfStructs];
for (NSUInteger i = 0; i < arrayOfStructyThings.count; ++i) {
    SomeOldStruct tr = arrayOfStructyThings[i];
    .... do your worst here ...
}