ios - Zoom image using auto layout in scroll view How to center? -


i'm done zooming using auto layout storyboard, problem image not center after zoom. goal make picture zoom picture boundaries without black stripes.

here constraints (it's standard scrollview imageview): enter image description here

and here done in order. firstable set uiscrollviewdelegate methods:

-(uiview *)viewforzoominginscrollview:(uiscrollview *)scrollview{     return self.fullscreenimageview; }

and after image download complete update height constraint of uiimageview:

-(void)setupconstraintstoimagesize:(cgsize)imagesize {     [self.imagehconstraint setconstant:imagesize.height];     [self layoutifneeded]; }

for image constraints

enter image description here

so it's work (sorry 3mb gif) :

enter image description here

so it's almost works, it's strangely goes bottom, not center, how center it?

i figure out have sth method -(void)scrollviewdidzoom:(uiscrollview *)scrollview i'm not sure should set there.

eureka! managed autolayout

to achieve needs done create outlet center y constraints , modify when zoomed:

-(void)scrollviewdidzoom:(uiscrollview *)scrollview {     cgfloat diff = self.fullscreenimageview.frame.size.height-self.fullscreenimageview.image.size.height;     if(self.fullscreenimageview.frame.size.height >= self.frame.size.height) {return;}     [self.centeryconstraint setconstant:-diff/2]; }

that's it.


Comments

Post a Comment

Popular posts from this blog

1111. appearing after print sequence - php -

morning, i have code takes string of shoe sizes, explodes , puts in table. code works , info displayed correctly on page after table there few 1's after table. i'm confused this. so table looks (in columns of 3 on webpage) available in following sizes: 3 4 5 6 9 10 111 here's codes, purpose of example $x = 3|4|6|10|9 function get_sizes_pipe($x) { $counter = 0; $splits = explode("|",$x); asort($splits); $x = print "<table class='greentable'>"; $x .= print "<thead><tr><th scope='col' colspan='3' abbr='starter'>available in following sizes:</th></tr></thead><tbody><tr>"; foreach ($splits $split) { $entry = print "<td>".$split."</td>"; if($counter == 2){ $entry .= print "</tr><tr>"; $counter =0; } else { $counter++; ...
Read more

java - WARN : org.springframework.web.servlet.PageNotFound - No mapping found for HTTP request with URI [/board/] in DispatcherServlet with name 'appServlet' -

this question has answer here: why spring mvc respond 404 , report “no mapping found http request uri […] in dispatcherservlet”? 3 answers i trying making simple bbs i'm encountering following error, warn : org.springframework.web.servlet.pagenotfound - no mapping found http request uri [/board/] in dispatcherservlet name 'appservlet' i have tried solve error many times, have failed. how can solve error? here web.xml, controllerand , servlet-context. my web.xml <?xml version="1.0" encoding="utf-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xsi:schemalocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <filter> <filter-nam...
Read more

Ruby on Rails, ActiveRecord, Postgres, UTF-8 and ASCII-8BIT encodings -

weirdest error, who’s challenge try , me? spent hours yesterday on , it’s magic. can't believe happening , it's driving me crazy. btw, using: rails 4.2.3 ruby 2.2.3 pg 0.18 encoding.default_internal = encoding.default_external = utf-8 config.encoding = 'utf-8' it has postgres, activerecord , encodings! turns out we’ve been getting these errors whenever create new users on database special characters: encoding::undefinedconversionerror: "\xc3" ascii-8bit utf-8 \xc3 may vary depending on characters. weird part we’ve set since beginning utf-8. makes no sense , digged it, , used script: user.all.each |user| user.attributes.each |name, value| if value.is_a? string puts user.email + name.encoding.to_s + value.encoding.to_s end end end and output of 1 of users, users same: dr_lottahelp@blahblah.comutf-8utf-8 dr_lottahelp@blahblah.comutf-8ascii-8bit dr_lottahelp@blahblah.comutf-8ascii-8bit dr_lottahelp@blahblah.comutf-8asci...
Read more