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ParallaxHeaderView.m
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ParallaxHeaderView.m
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//
// ParallaxHeaderView.m
// ParallaxTableViewHeader
//
// Created by Vinodh on 26/10/14.
// Copyright (c) 2014 Daston~Rhadnojnainva. All rights reserved.
//
#import <QuartzCore/QuartzCore.h>
#import "ParallaxHeaderView.h"
#import "UIImage+ImageEffects.h"
@interface ParallaxHeaderView ()
@property (weak, nonatomic) IBOutlet UIScrollView *imageScrollView;
@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@property (weak, nonatomic) IBOutlet UIView *subView;
@property (nonatomic) IBOutlet UIImageView *bluredImageView;
@end
#define kDefaultHeaderFrame CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)
static CGFloat kParallaxDeltaFactor = 0.5f;
static CGFloat kMaxTitleAlphaOffset = 100.0f;
static CGFloat kLabelPaddingDist = 8.0f;
@implementation ParallaxHeaderView
+ (id)parallaxHeaderViewWithImage:(UIImage *)image forSize:(CGSize)headerSize;
{
ParallaxHeaderView *headerView = [[ParallaxHeaderView alloc] initWithFrame:CGRectMake(0, 0, headerSize.width, headerSize.height)];
headerView.headerImage = image;
[headerView initialSetupForDefaultHeader];
return headerView;
}
+ (id)parallaxHeaderViewWithSubView:(UIView *)subView
{
ParallaxHeaderView *headerView = [[ParallaxHeaderView alloc] initWithFrame:CGRectMake(0, 0, subView.frame.size.width, subView.frame.size.height)];
[headerView initialSetupForCustomSubView:subView];
return headerView;
}
- (void)awakeFromNib
{
if (self.subView)
[self initialSetupForCustomSubView:self.subView];
else
[self initialSetupForDefaultHeader];
[self refreshBlurViewForNewImage];
}
- (void)layoutHeaderViewForScrollViewOffset:(CGPoint)offset
{
CGRect frame = self.imageScrollView.frame;
if (offset.y > 0)
{
frame.origin.y = MAX(offset.y *kParallaxDeltaFactor, 0);
self.imageScrollView.frame = frame;
self.bluredImageView.alpha = 1 / kDefaultHeaderFrame.size.height * offset.y * 2;
self.clipsToBounds = YES;
}
else
{
CGFloat delta = 0.0f;
CGRect rect = kDefaultHeaderFrame;
delta = fabs(MIN(0.0f, offset.y));
rect.origin.y -= delta;
rect.size.height += delta;
self.imageScrollView.frame = rect;
self.clipsToBounds = NO;
self.headerTitleLabel.alpha = 1 - (delta) * 1 / kMaxTitleAlphaOffset;
}
}
- (void)refreshBlurViewForNewImage
{
UIImage *screenShot = [self screenShotOfView:self];
screenShot = [screenShot applyBlurWithRadius:5 tintColor:[UIColor colorWithWhite:0.6 alpha:0.2] saturationDeltaFactor:1.0 maskImage:nil];
self.bluredImageView.image = screenShot;
}
#pragma mark -
#pragma mark Private
- (void)initialSetupForDefaultHeader
{
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:self.bounds];
self.imageScrollView = scrollView;
UIImageView *imageView = [[UIImageView alloc] initWithFrame:scrollView.bounds];
imageView.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
imageView.contentMode = UIViewContentModeScaleAspectFill;
imageView.image = self.headerImage;
self.imageView = imageView;
[self.imageScrollView addSubview:imageView];
CGRect labelRect = self.imageScrollView.bounds;
labelRect.origin.x = labelRect.origin.y = kLabelPaddingDist;
labelRect.size.width = labelRect.size.width - 2 * kLabelPaddingDist;
labelRect.size.height = labelRect.size.height - 2 * kLabelPaddingDist;
UILabel *headerLabel = [[UILabel alloc] initWithFrame:labelRect];
headerLabel.textAlignment = NSTextAlignmentCenter;
headerLabel.numberOfLines = 0;
headerLabel.lineBreakMode = NSLineBreakByWordWrapping;
headerLabel.autoresizingMask = imageView.autoresizingMask;
headerLabel.textColor = [UIColor whiteColor];
headerLabel.font = [UIFont fontWithName:@"AvenirNextCondensed-Regular" size:23];
self.headerTitleLabel = headerLabel;
[self.imageScrollView addSubview:self.headerTitleLabel];
self.bluredImageView = [[UIImageView alloc] initWithFrame:self.imageView.frame];
self.bluredImageView.autoresizingMask = self.imageView.autoresizingMask;
self.bluredImageView.alpha = 0.0f;
[self.imageScrollView addSubview:self.bluredImageView];
[self addSubview:self.imageScrollView];
[self refreshBlurViewForNewImage];
}
- (void)initialSetupForCustomSubView:(UIView *)subView
{
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:self.bounds];
self.imageScrollView = scrollView;
self.subView = subView;
subView.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
[self.imageScrollView addSubview:subView];
self.bluredImageView = [[UIImageView alloc] initWithFrame:subView.frame];
self.bluredImageView.autoresizingMask = subView.autoresizingMask;
self.bluredImageView.alpha = 0.0f;
[self.imageScrollView addSubview:self.bluredImageView];
[self addSubview:self.imageScrollView];
[self refreshBlurViewForNewImage];
}
- (void)setHeaderImage:(UIImage *)headerImage
{
_headerImage = headerImage;
self.imageView.image = headerImage;
[self refreshBlurViewForNewImage];
}
- (UIImage *)screenShotOfView:(UIView *)view
{
UIGraphicsBeginImageContextWithOptions(kDefaultHeaderFrame.size, YES, 0.0);
[self drawViewHierarchyInRect:kDefaultHeaderFrame afterScreenUpdates:NO];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
@end