FaderView - A UIView to add an edge fade

FaderView.m

//
//  FaderView.h
//
//  Created by Rob Booth on 11/6/12.
//
//
// Usage
// [[FaderView alloc] initWithFrame:CGRectZero color:[UIColor redColor] andDirection:FaderViewDirectionDown];

#import <UIKit/UIKit.h>

typedef enum {
	FaderViewDirectionDown = 0,
	FaderViewDirectionUp = 1,
	FaderViewDirectionLeft = 2,
	FaderViewDirectionRight = 3,
} FaderViewDirection;

@interface FaderView : UIView

- (id)initWithFrame:(CGRect)frame color:(UIColor *)color andDirection:(FaderViewDirection)direction;

@end

//
//  FaderView.m
//
//  Created by Rob Booth on 11/6/12.
//
//

#import "FaderView.h"

@implementation FaderView

+ (Class)layerClass
{
	return [CAGradientLayer class];
}

- (id)initWithFrame:(CGRect)frame color:(UIColor *)color andDirection:(FaderViewDirection)direction
{
	self = [super initWithFrame:frame];
	self.autoresizingMask = UIViewAutoresizingFlexibleWidth+UIViewAutoresizingFlexibleHeight;
	self.backgroundColor = [UIColor clearColor];
	self.clipsToBounds = YES;
	
	NSArray * colors = @[ (id)color.CGColor, (id)[color colorWithAlphaComponent:0.0].CGColor ];
	CGPoint startPoint = CGPointMake(0.5, 0.0);
	CGPoint endPoint = CGPointMake(0.5, 1.0);

	if (direction == FaderViewDirectionUp || direction == FaderViewDirectionLeft)
	{
		colors = @[ (id)[color colorWithAlphaComponent:0.0].CGColor, (id)color.CGColor ];
	}
		
	// Rotate start and end points
	if (direction == FaderViewDirectionLeft || direction == FaderViewDirectionRight)
	{
		startPoint = CGPointMake(0.0, 0.5);
		endPoint = CGPointMake(1.0, 0.5);
	}
	
	CAGradientLayer * layer = (id)self.layer;
	layer.startPoint = startPoint;
	layer.endPoint = endPoint;
	layer.shouldRasterize = YES;
	layer.colors = colors;
	
	return self;
}

@end