Imitation Bread Travel Personal Center dropdown top background amplification Gaussian blur effect

HeaderView.h

////HeaderView.h//Imitation Bread Travel Personal Center////Created by [e-mail protected] on 15/5/14.//Copyright (c) 2015 wb145230. All rights reserved.//#import<UIKit/UIKit.h>@interfaceHeaderview:uiview@property (nonatomic, strong) Uiscrollview*Imagescrollview, @property (nonatomic, strong) Uiimageview*imageview;//Background Image@property (nonatomic, strong) Uiimageview *imagebackgroundview;//to change the background picture/** * Change the size of the top view and the Gaussian effect * * @param offset ScrollView sliding record*/-(void) Updateheaderview: (cgpoint) offset;@end

headerview.m

////headerview.m//Imitation Bread Travel Personal Center////Created by [e-mail protected] on 15/5/14.//Copyright (c) 2015 wb145230. All rights reserved.//#import "HeaderView.h"#import<Accelerate/Accelerate.h>@implementationHeaderview-(Instancetype) initWithFrame: (CGRect) Frame {if(self =[Super Initwithframe:frame]) {Self.imagescrollview=[[Uiscrollview alloc] initWithFrame:self.bounds];                [Self addSubview:self.imageScrollView]; UIImage*image = [UIImage imagenamed:@"HEADER_BG"]; //Gaussian background imageSelf.imagebackgroundview =[[Uiimageview alloc] initWithFrame:self.imageScrollView.bounds];        [Self setblurryimage:image]; Self.imageBackgroundView.autoresizingMask= Uiviewautoresizingflexibleleftmargin | Uiviewautoresizingflexiblerightmargin | Uiviewautoresizingflexibletopmargin | Uiviewautoresizingflexiblebottommargin | Uiviewautoresizingflexibleheight |Uiviewautoresizingflexiblewidth; Self.imageBackgroundView.contentMode=Uiviewcontentmodescaleaspectfill;                [Self.imagescrollview AddSubview:self.imageBackgroundView]; //OriginalSelf.imageview =[[Uiimageview alloc] initWithFrame:self.imageScrollView.bounds]; Self.imageView.image=image; Self.imageView.autoresizingMask= Uiviewautoresizingflexibleleftmargin | Uiviewautoresizingflexiblerightmargin | Uiviewautoresizingflexibletopmargin | Uiviewautoresizingflexiblebottommargin | Uiviewautoresizingflexibleheight |Uiviewautoresizingflexiblewidth; Self.imageView.contentMode=Uiviewcontentmodescaleaspectfill;    [Self.imagescrollview AddSubview:self.imageView]; }        returnSelf ;}/** * Change the size and Gaussian effect of the top view by sliding the scrollview * * @param offset ScrollView falling distance*/-(void) Updateheaderview: (cgpoint) offset {if(Offset.y <0) {CGRect rect= CGRectMake (0,0, Self.frame.size.width, self.frame.size.height); CGFloat Delta= Fabs (MIN (0.0f, Offset.y)); RECT.ORIGIN.Y-=Delta; Rect.size.height+=Delta; Self.imageScrollView.frame=rect; Self.clipstobounds=NO; Self.imageView.alpha= Fabs (Offset.y/(2* Cgrectgetheight (Self.bounds)/3)); }}/** * Gaussian picture * * @param originalimage need Gauss's picture*/- (void) Setblurryimage: (UIImage *) originalimage {dispatch_async (Dispatch_get_global_queue (Dispatch_queue_priority_default,0), ^{UIImage*blurredimage = [Self blurryimage:originalimage withblurlevel:0.9]; Dispatch_async (Dispatch_get_main_queue (),^{Self.imageView.alpha=0.0; Self.imageBackgroundView.image=Blurredimage;    });    }); }/** * Gaussian background * * @param image requires Gaussian blur picture * @param blur Gaussian Blur value * * @return*/-(UIImage *) Blurryimage: (UIImage *) Image withblurlevel: (CGFloat) Blur {if((Blur <0.0f) || (Blur >1.0f) ) {Blur=0.5f; }        intBoxsize = (int) (Blur * -); Boxsize-= (boxsize%2) +1; Cgimageref img=image.        Cgimage;    Vimage_buffer Inbuffer, Outbuffer;    Vimage_error Error; void*Pixelbuffer; Cgdataproviderref Inprovider=Cgimagegetdataprovider (IMG); Cfdataref Inbitmapdata=Cgdataprovidercopydata (Inprovider); Inbuffer.width=cgimagegetwidth (IMG); Inbuffer.height=cgimagegetheight (IMG); Inbuffer.rowbytes=Cgimagegetbytesperrow (IMG); Inbuffer.data= (void*) cfdatagetbyteptr (inbitmapdata); Pixelbuffer= malloc (Cgimagegetbytesperrow (IMG) *cgimagegetheight (IMG)); Outbuffer.data=Pixelbuffer; Outbuffer.width=cgimagegetwidth (IMG); Outbuffer.height=cgimagegetheight (IMG); Outbuffer.rowbytes=Cgimagegetbytesperrow (IMG); Error= vimageboxconvolve_argb8888 (&inbuffer, &outbuffer, NULL,0,0, Boxsize, Boxsize, NULL, kvimageedgeextend); if(Error) {NSLog (@"error from convolution%ld", error); } cgcolorspaceref colorspace=Cgcolorspacecreatedevicergb (); Cgcontextref CTX= Cgbitmapcontextcreate (Outbuffer.data, Outbuffer.width, Outbuffer.height,8, Outbuffer.rowbytes, ColorSpace, Cgimagegetbitmapinfo (image.        Cgimage)); Cgimageref Imageref=cgbitmapcontextcreateimage (CTX); UIImage*returnimage =[UIImage Imagewithcgimage:imageref]; // Clean Upcgcontextrelease (CTX);        Cgcolorspacerelease (ColorSpace);    Free (pixelbuffer);        Cfrelease (Inbitmapdata);    Cgcolorspacerelease (ColorSpace);        Cgimagerelease (IMAGEREF); returnreturnimage;}@end

ViewController.h

////ViewController.h//Imitation Bread Travel Personal Center////Created by [e-mail protected] on 15/5/14.//Copyright (c) 2015 wb145230. All rights reserved.//#import<UIKit/UIKit.h>#import "HeaderView.h"@interfaceViewcontroller:uiviewcontroller<uitableviewdatasource, uitableviewdelegate>@property (nonatomic, strong) UITableView*TableView, @property (nonatomic, strong) Headerview*Headerview;@end

Viewcontroller.m

////VIEWCONTROLLER.M//Imitation Bread Travel Personal Center////Created by [e-mail protected] on 15/5/14.//Copyright (c) 2015 wb145230. All rights reserved.//#import "ViewController.h"@interfaceViewcontroller ()@end@implementationViewcontroller- (void) viewdidload {[Super viewdidload];        [[UIApplication sharedapplication] setstatusbarstyle:uistatusbarstylelightcontent Animated:YES]; Self.view.backgroundColor=[Uicolor Whitecolor]; Self.tableview=[[UITableView alloc] InitWithFrame:self.view.bounds Style:uitableviewstyleplain]; Self.tableView.dataSource=Self ; Self.tableview.Delegate=Self ; Self.tableView.autoresizingMask= Uiviewautoresizingflexibleheight |Uiviewautoresizingflexiblewidth; Self.tableView.separatorColor=[Uicolor Clearcolor]; Self.tableView.showsVerticalScrollIndicator=NO; Self.headerview= [[Headerview alloc] Initwithframe:cgrectmake (0,0, Self.view.frame.size.width, -)]; Self.tableView.tableHeaderView=Self.headerview;    [Self.view AddSubview:self.tableView]; }-(void) Scrollviewdidscroll: (Uiscrollview *) ScrollView {[Self.headerview updateHeaderView:scrollView.contentOffset];}-(Nsinteger) TableView: (UITableView *) TableView numberofrowsinsection: (nsinteger) Section {return Ten;}-(UITableViewCell *) TableView: (UITableView *) TableView Cellforrowatindexpath: (Nsindexpath *) indexpath{UITableViewCell*cell = [TableView dequeuereusablecellwithidentifier:@"Cell"]; if(Cell = =Nil) {Cell= [[UITableViewCell alloc] Initwithstyle:uitableviewcellstyledefault reuseidentifier:@"Cell"]; } Cell.selectionstyle=Uitableviewcellselectionstylenone; returncell;}- (void) didreceivememorywarning {[Super didreceivememorywarning];}@end

Effect

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Imitation Bread Travel Personal Center dropdown top background amplification Gaussian blur effect