CODEWITHSUNDEEP
objective-ccocoa-touch
jdl
jdl

Reputation: 6323

What is the name for UIControlState to get the value when subclassing UIButton?

I am subclassing UIButton. But I need to know the state that the button is in to draw the color of button for up or down:

- (void)drawRect:(CGRect)rect{
     if (state==UIControlStateNormal) {
         //draw rect RED
     }
     if (state==UIControlEventTouchDown) 
         //draw rect BLUE
     }
}

Upvotes: 3

Views: 3002

Answers (3)

jdl
jdl

Reputation: 6323

To redraw rect, I did this...

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    myState = 1;
    [self setNeedsDisplay];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
    myState = 0;
    [self setNeedsDisplay];
}


- (void)drawRect:(CGRect)rect
{
    // Drawing code
    NSLog(@"drawRect state: %d", self.state);
    NSLog(@"rect %@", NSStringFromCGRect(self.frame));
    c = UIGraphicsGetCurrentContext();

    if (myState==0){
    ///////// plot border /////////////
    CGContextBeginPath(c);
    CGContextSetLineWidth(c, 2.0);
    CGContextMoveToPoint(c, 1, 1);
    CGContextAddLineToPoint(c, 1, 20);
    CGContextAddLineToPoint(c, 299, 20);
    CGContextAddLineToPoint(c, 299, 1);
    CGContextSetRGBFillColor(c, 0.0, 0.0, 1.0, 1.0);
    CGContextFillPath(c);
    CGContextClosePath(c);
    CGContextStrokePath(c);
    }else{
    CGContextBeginPath(c);
    CGContextSetLineWidth(c, 2.0);
    CGContextMoveToPoint(c, 1, 20);
    CGContextAddLineToPoint(c, 1, 40);
    CGContextAddLineToPoint(c, 299, 40);
    CGContextAddLineToPoint(c, 299, 20);
    CGContextSetRGBFillColor(c, 1.0, 0.0, 1.0, 1.0);
    CGContextFillPath(c);
    CGContextClosePath(c);
    CGContextStrokePath(c); 
    }
}

Upvotes: 0

Paul.s
Paul.s

Reputation: 38728

Did you even try looking at the docs?

  1. Goto UIButton Reference
  2. Check the properties
  3. Nothing obvious
  4. See if UIButton has a superclass
  5. Goto UIControl Reference - UIButton's superclass
  6. Check the properties
  7. Oh look there is a state property

Update

The accepted answer is slightly incorrect and could lead to some annoyingly difficult bug to track down.

The header for UIControl declares state as

@property(nonatomic,readonly) UIControlState state;                  // could be more than one state (e.g. disabled|selected). synthesized from other flags.

Now looking up to see how UIControlState is defined we see

enum {
    UIControlStateNormal       = 0,                       
    UIControlStateHighlighted  = 1 << 0,                  // used when UIControl isHighlighted is set
    UIControlStateDisabled     = 1 << 1,
    UIControlStateSelected     = 1 << 2,                  // flag usable by app (see below)
    UIControlStateApplication  = 0x00FF0000,              // additional flags available for application use
    UIControlStateReserved     = 0xFF000000               // flags reserved for internal framework use
};
typedef NSUInteger UIControlState;

Therefore as you are dealing with a bit mask you should check for the state appropriately e.g.

if (self.state & UIControlStateNormal) { ... }

Update 2

You could do this by drawing into an image and then setting the image as the background e.g.

- (void)clicked:(UIButton *)button;
{
    UIGraphicsBeginImageContext(button.frame.size);

    // Draw gradient

    UIImage *gradient = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    [button setBackgroundImage:image forState:UIControlStateNormal];
}

Upvotes: 5

cxa
cxa

Reputation: 4248

Since state is a property, you can use self.state to access it.

Update:

See the next answer's update.

Upvotes: 1

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