How can I draw textured button in iOS? - ios

Question

I would like to draw textured button in iOS app. I would not use Photoshop rather CoreGraphics because I want a general solution that works with buttons that has different size. What is the basic principle of it? What technology do I need?
My first step was to subclass a UIButton, but how can I add i.e. bevel effect to it?

Answer 1

The best approach will be subclassing you button class(your new class must inherit from UIButton). by doing this you can give some customized details too to your button.. Below is a sample ..
//interface of custom button class
#interface myButton : UIButton
{
int orderNo;
CAGradientLayer *gradientLayer;
CALayer *wrapperLayer;
CGColorRef _borderColor;
}
#property (assign) int orderNo;
#property (nonatomic) CGColorRef _borderColor;
#property (nonatomic, retain) CALayer *wrapperLayer;
#property (nonatomic, retain) CAGradientLayer *gradientLayer;
- (void)setBorderColor:(CGColorRef)color;
- (void)setCornerRadius:(float)radius;
The implementation..
#import "Button.h"
#implementation Button
#synthesize orderNo,wrapperLayer,_borderColor,gradientLayer;
- (id)initWithFrame:(CGRect)frame
{if ((self = [super initWithFrame:frame])) {
CGFloat radius = self.bounds.size.width / 2;
CGFloat borderWidth = self.bounds.size.width / 10;
self.layer.backgroundColor = [[UIColor blackColor] CGColor];
self.layer.borderColor = [[UIColor whiteColor] CGColor];
self.layer.borderWidth = borderWidth;
self.layer.cornerRadius = radius;
if ([self.layer respondsToSelector:#selector(setShadowOffset:)])
self.layer.shadowOffset = CGSizeMake(0.25, 0.25);
if ([self.layer respondsToSelector:#selector(setShadowColor:)])
self.layer.shadowColor = [[UIColor blackColor] CGColor];
if ([self.layer respondsToSelector:#selector(setShadowRadius:)])
self.layer.shadowRadius = borderWidth;
if ([self.layer respondsToSelector:#selector(setShadowOpacity:)])
self.layer.shadowOpacity = 0.75;
[self setNeedsDisplay];
}
return self;
}
- (void)drawRect:(CGRect)rect {
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSetShouldAntialias(ctx, true);
CGFloat xsize = self.bounds.size.width / 6;
CGFloat borderWidth = self.bounds.size.width / 10;
CGContextSaveGState(ctx);
CGContextSetLineCap(ctx, kCGLineCapRound);
CGContextSetLineWidth(ctx, borderWidth);
CGContextSetStrokeColorWithColor(ctx, [[UIColor whiteColor] CGColor]);
CGFloat width = self.bounds.size.width;
CGPoint start1 = CGPointMake(width / 2 - xsize, width / 2 - xsize);
CGPoint end1 = CGPointMake(width / 2 + xsize, width / 2 + xsize);
CGPoint start2 = CGPointMake(width / 2 + xsize, width / 2 - xsize);
CGPoint end2 = CGPointMake(width / 2 - xsize, width / 2 + xsize);
CGContextBeginPath(ctx);
CGContextMoveToPoint(ctx, start1.x, start1.y);
CGContextAddLineToPoint(ctx, end1.x, end1.y);
CGContextStrokePath(ctx);
CGContextBeginPath(ctx);
CGContextMoveToPoint(ctx, start2.x, start2.y);
CGContextAddLineToPoint(ctx, end2.x, end2.y);
CGContextStrokePath(ctx);
CGContextRestoreGState(ctx);
}
- (void)setBorderColor:(CGColorRef)color
{
[[self layer] setBorderColor:color];
[[self layer] setNeedsDisplay];
}
- (void)setCornerRadius:(float)radius
{
[[self layer] setCornerRadius:radius];
// and get the wrapper for the gradient layer too
[wrapperLayer setCornerRadius:radius];
}
#end