Everything compiles without a single warning or error….
but ctx is always NIL.

What would cause that?

1. Use a “View-based application” from the templates. This will give you a view controller and a nib.

2. From the file menu, select new file, and make it a new objective-C class. Have your new class subclass UIView instead of NSObject.

3. In your view controller’s nib file, change the class of your UIView to the new class you just created.

In your new class you will see the drawRect method commented out. If you uncomment it and paste in the tutorial code it should now work!

1: I make a view based app
2: Go to the View controller .m file
3: Do the DrawRect method

- (void)drawRect:(CGRect)rect
{
// Get the graphics context and clear it
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextClearRect(ctx, rect);
// Draw a red solid square
CGContextSetRGBFillColor(ctx, 1.0, 0.0, 0.0, 1.0);
CGContextFillRect(ctx, CGRectMake(10, 10, 50, 50));
}

And nothing happens. I’ve wasted my whole day. Any help?
Should I redraw something? Why doest it draws on my template mede view??? thx

I’m trying to draw a gauge — like a speedometer or volt meter.

Do you know of any links that point to source code that I can use as a starting point.

Thanks,

MM.

help me or i die ! (U can add nick hoangtuanfithou, please)
code like that :

//Init Image Array
-(void)InitImageArray1
{
myAnimationImages1 = [[NSMutableArray alloc] init];

for ( int i = 0; i < 24; i++ )
{
NSAutoreleasePool *poolArray=[[NSAutoreleasePool alloc] init];

NSString *fileName = [NSString stringWithFormat:@"001 (%d)",i];
image = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:fileName ofType:@”jpg”]];

[myAnimationImages1 addObject:image];
[poolArray release];
}

}

//Change Image
self.mainImage.image = [self.myAnimationImages1 objectAtIndex:animationImageArrIndex];