How to Draw a "Speech Bubble" on an Iphone

How to draw a speech bubble on an iPhone?

I've actually drawn this exact shape before (rounded rectangle with a pointing triangle at the bottom). The Quartz drawing code that I used is as follows:

CGRect currentFrame = self.bounds;

CGContextSetLineJoin(context, kCGLineJoinRound);
CGContextSetLineWidth(context, strokeWidth);
CGContextSetStrokeColorWithColor(context, [MyPopupLayer popupBorderColor]); 
CGContextSetFillColorWithColor(context, [MyPopupLayer popupBackgroundColor]);

// Draw and fill the bubble
CGContextBeginPath(context);
CGContextMoveToPoint(context, borderRadius + strokeWidth + 0.5f, strokeWidth + HEIGHTOFPOPUPTRIANGLE + 0.5f);
CGContextAddLineToPoint(context, round(currentFrame.size.width / 2.0f - WIDTHOFPOPUPTRIANGLE / 2.0f) + 0.5f, HEIGHTOFPOPUPTRIANGLE + strokeWidth + 0.5f);
CGContextAddLineToPoint(context, round(currentFrame.size.width / 2.0f) + 0.5f, strokeWidth + 0.5f);
CGContextAddLineToPoint(context, round(currentFrame.size.width / 2.0f + WIDTHOFPOPUPTRIANGLE / 2.0f) + 0.5f, HEIGHTOFPOPUPTRIANGLE + strokeWidth + 0.5f);
CGContextAddArcToPoint(context, currentFrame.size.width - strokeWidth - 0.5f, strokeWidth + HEIGHTOFPOPUPTRIANGLE + 0.5f, currentFrame.size.width - strokeWidth - 0.5f, currentFrame.size.height - strokeWidth - 0.5f, borderRadius - strokeWidth);
CGContextAddArcToPoint(context, currentFrame.size.width - strokeWidth - 0.5f, currentFrame.size.height - strokeWidth - 0.5f, round(currentFrame.size.width / 2.0f + WIDTHOFPOPUPTRIANGLE / 2.0f) - strokeWidth + 0.5f, currentFrame.size.height - strokeWidth - 0.5f, borderRadius - strokeWidth);
CGContextAddArcToPoint(context, strokeWidth + 0.5f, currentFrame.size.height - strokeWidth - 0.5f, strokeWidth + 0.5f, HEIGHTOFPOPUPTRIANGLE + strokeWidth + 0.5f, borderRadius - strokeWidth);
CGContextAddArcToPoint(context, strokeWidth + 0.5f, strokeWidth + HEIGHTOFPOPUPTRIANGLE + 0.5f, currentFrame.size.width - strokeWidth - 0.5f, HEIGHTOFPOPUPTRIANGLE + strokeWidth + 0.5f, borderRadius - strokeWidth);
CGContextClosePath(context);
CGContextDrawPath(context, kCGPathFillStroke);

// Draw a clipping path for the fill
CGContextBeginPath(context);
CGContextMoveToPoint(context, borderRadius + strokeWidth + 0.5f, round((currentFrame.size.height + HEIGHTOFPOPUPTRIANGLE) * 0.50f) + 0.5f);
CGContextAddArcToPoint(context, currentFrame.size.width - strokeWidth - 0.5f, round((currentFrame.size.height + HEIGHTOFPOPUPTRIANGLE) * 0.50f) + 0.5f, currentFrame.size.width - strokeWidth - 0.5f, currentFrame.size.height - strokeWidth - 0.5f, borderRadius - strokeWidth);
CGContextAddArcToPoint(context, currentFrame.size.width - strokeWidth - 0.5f, currentFrame.size.height - strokeWidth - 0.5f, round(currentFrame.size.width / 2.0f + WIDTHOFPOPUPTRIANGLE / 2.0f) - strokeWidth + 0.5f, currentFrame.size.height - strokeWidth - 0.5f, borderRadius - strokeWidth);
CGContextAddArcToPoint(context, strokeWidth + 0.5f, currentFrame.size.height - strokeWidth - 0.5f, strokeWidth + 0.5f, HEIGHTOFPOPUPTRIANGLE + strokeWidth + 0.5f, borderRadius - strokeWidth);
CGContextAddArcToPoint(context, strokeWidth + 0.5f, round((currentFrame.size.height + HEIGHTOFPOPUPTRIANGLE) * 0.50f) + 0.5f, currentFrame.size.width - strokeWidth - 0.5f, round((currentFrame.size.height + HEIGHTOFPOPUPTRIANGLE) * 0.50f) + 0.5f, borderRadius - strokeWidth);
CGContextClosePath(context);
CGContextClip(context);     

The clipping path at the end can be left out if you're not going to use a gradient or some other more fill that's more complex than a simple color.

How to draw the speech bubble as UITextview ContentSize

Are you triggering the redraw when the text is changed?

In the textViewDidChange method add...

[self setNeedsDisplay];

... as the last line.

This will trigger the drawRect method again.

How to draw a thought bubble in iOS

So you want to mask the image in the bubble.
So make the bubble internally full black.(To use for masking) and use the bellow function for masking.

- (UIImage*) maskImage:(UIImage *)image withMask:(UIImage *)maskImage {

CGImageRef maskRef = maskImage.CGImage; 

CGImageRef mask = CGImageMaskCreate(CGImageGetWidth(maskRef),
    CGImageGetHeight(maskRef),
    CGImageGetBitsPerComponent(maskRef),
    CGImageGetBitsPerPixel(maskRef),
    CGImageGetBytesPerRow(maskRef),
    CGImageGetDataProvider(maskRef), NULL, false);

CGImageRef masked = CGImageCreateWithMask([image CGImage], mask);
return [UIImage imageWithCGImage:masked];

}

for more sample tutorial visit the following links :-)

http://jeroendeleeuw.com/post/33638733049/how-to-mask-images-with-core-graphics-in-ios

http://iosdevelopertips.com/cocoa/how-to-mask-an-image.html

How to draw an oval speech bubble programmatically on iPhone?

I would do it in two iterations.

First get the context and begin a path. Fill an ellipse and then a custom path that encloses a triangle with three lines. I assumed the following dimensions: 70 width, 62 height. Override draw rect in a subclass of UIView and instantiate in a subclassed UIViewController:

-(void)drawRect:(CGRect)rect {
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    CGContextSetRGBFillColor(ctx, 0.0, 0.0, 1.0, 1.0);
    CGContextFillEllipseInRect(ctx, CGRectMake(0.0, 0.0, 70.0, 50.0)); //oval shape
    CGContextBeginPath(ctx);
    CGContextMoveToPoint(ctx, 8.0, 40.0);
    CGContextAddLineToPoint(ctx, 6.0, 50.0);
    CGContextAddLineToPoint(ctx, 18.0, 45.0);
    CGContextClosePath(ctx);
    CGContextFillPath(ctx);
}

Produces this in the iPhone simulator when added against a gray backdrop:

This second code example will almost duplicate what you produced above. I implemented this using flexible sizes that could be supplied to the UIView frame when you instantiate it. Essentially, the white portion of the speech bubble is drawn with a black stroke over lay to follow.

-(void)drawRect:(CGRect)rect {
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    CGRect aRect = CGRectMake(2.0, 2.0, (self.bounds.size.width * 0.95f), (self.bounds.size.width * 0.60f)); // set the rect with inset.
    CGContextSetRGBFillColor(ctx, 1.0, 1.0, 1.0, 1.0); //white fill
    CGContextSetRGBStrokeColor(ctx, 0.0, 0.0, 0.0, 1.0); //black stroke
    CGContextSetLineWidth(ctx, 2.0); 


    CGContextFillEllipseInRect(ctx, aRect); 
    CGContextStrokeEllipseInRect(ctx, aRect);    

    CGContextBeginPath(ctx);
    CGContextMoveToPoint(ctx, (self.bounds.size.width * 0.10), (self.bounds.size.width * 0.48f));
    CGContextAddLineToPoint(ctx, 3.0, (self.bounds.size.height *0.80f));
    CGContextAddLineToPoint(ctx, 20.0, (self.bounds.size.height *0.70f));
    CGContextClosePath(ctx);
    CGContextFillPath(ctx);

    CGContextBeginPath(ctx);
    CGContextMoveToPoint(ctx, (self.bounds.size.width * 0.10), (self.bounds.size.width * 0.48f));
    CGContextAddLineToPoint(ctx, 3.0, (self.bounds.size.height *0.80f));
    CGContextStrokePath(ctx);

    CGContextBeginPath(ctx);
    CGContextMoveToPoint(ctx, 3.0, (self.bounds.size.height *0.80f));
    CGContextAddLineToPoint(ctx, 20.0, (self.bounds.size.height *0.70f));
    CGContextStrokePath(ctx);
 }

speech bubbles like in comics for iphone

I would use a transparent UIView with a UIImageView containing the bubble and a UITextView set editable.

Use this to resize the text view whenever the text view changed notification is sent:
CGRect frame = textview.frame;
frame.size.height = textview.contentSize.height;
Textview.frame = frame;

Subclass the UIView and use touchesbegan and touchesmoved to determine where to move the view as its being dragged.

sizewithfont: constrainedtosize: linebreakmode is the string size method

How to save a UIImage of this layout to the photo album:

CGRect screenRect = CGRectMake(0, 0, 320, 416); // change this as necessary
UIGraphicsBeginImageContext(screenRect.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(screenshot, nil, nil, nil);

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