Question

The variables bounds, width and height are at present local variables. I cannot access them from other classes or even access them from another method.

How can I make these variables available to the whole instance? I have tried placing them within the .h file and renaming them to CGFloats to no avail.

#import "TicTacToeBoard.h"

@implementation TicTacToeBoard

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}

- (void)drawRect:(CGRect)rect
{
    CGRect bounds = [self bounds];
    float width = bounds.size.width;
    float height = bounds.size.height;

    CGContextRef ctx = UIGraphicsGetCurrentContext();
    CGContextSetRGBStrokeColor(ctx, 0.3, 0.3, 0.3, 1);
    CGContextSetLineWidth(ctx, 5);
    CGContextSetLineCap(ctx, kCGLineCapRound);

    CGContextMoveToPoint(ctx, width/3, height * 0.95);
    CGContextAddLineToPoint(ctx, width/3, height * 0.05);
    CGContextStrokePath(ctx);

}

@end

Answer 1

You can use properties to make variables accessible to other objects.

In your interface add something like this:

@property (nonatomic, retain) NSString *myString;

and then add

@synthesize mystring;

to your implementation.

Two methods will be created to get the property and to change it.

[myObject myString]; // returns the property
[myObject setMyString:@"new string"]; // changes the property

// alternately, you can write it this way
myObject.myString;
myObject.mystring = @"new string";

You can change the value of a property within a class using [self setMystring:@"new value"] or if you have the same variable already declared in the interface and then create a property from it you can keep using your variables within the class the way you are .

There’s more info on properties in the developer docs: http://developer.apple.com/library/ios/#documentation/cocoa/conceptual/objectiveC/Chapters/ocProperties.html#//apple_ref/doc/uid/TP30001163-CH17-SW1