ios - How do I add a constraint such that a view is as wide as the widest of two other views? -

-

for example, labels a, b , c. label should have width of whichever wider, b or c.

visually, along lines of

@"h:[viewa(==max(viewb,viewc))]"

if want ensure viewa simultaneously @ least wide both viewb , viewc, use 2 separate vfl statements, @"h:[viewa(>=viewb)]" , @"h:[viewa(>=viewc)]".

if want ensure not wider maximum width of viewb and/or viewc, define optional constraint (i.e. lower priority uilayoutpriorityrequired) width of viewa equal 1 of them, e.g.:

nslayoutconstraint *constraint = [nslayoutconstraint constraintwithitem:viewa                                                               attribute:nslayoutattributewidth                                                               relatedby:nslayoutrelationequal                                                                  toitem:viewb                                                               attribute:nslayoutattributewidth                                                              multiplier:1.0                                                                constant:0.0]; constraint.priority = uilayoutprioritydefaultlow; [viewa.superview addconstraint:constraint];

according documentation priority:

if constraint 'a == b' optional, constraint-based layout system attempt minimize 'abs(a-b)'.

thus, if viewb larger viewc, optional constraint satisfied , viewa wide viewb. if viewb smaller viewc, constraint system satisfy required @"h:[viewa(>=viewc)]" constraint, minimize abs(a-b), making viewa same width viewc.

in practice, don't need optional viewa==viewb constraint, if want ensure viewa won't wider both viewb , viewc, add final optional constraint.


Comments

Post a Comment

Popular posts from this blog

c# - must be a non-abstract type with a public parameterless constructor in redis -

-
when save object, got below error must non-abstract type public parameterless constructor in order use parameter 't' in generic type or method 'servicestack.redis.redisclient.store<t>(t) redisclass.getinstnace().store(msg); // error here redisclass.getinstnace().save(); as third party's class, can not edit how save object? could create wrapper around third party object call constructor, store wrapper? e.g. public class mywrapper { public thirdpartyobject thirdpartyinstance { get; set; } public mywrapper() { thirdpartyinstance = new thirdpartyobject("constructors"); } }
Read more

c# - ReportViewer control - axd url -

-
i've embedded microsoft.reporting.webforms.reportviewer control in aspx. site works on mysite.com. when try exmple export report, there new black window opened address mysite.com/reserved.reportviewerwebcontrol.axd... it's working fine. but.. pass axd via proxy. mean, i'd force export use url myproxy.mysite.com/reserved.reportviewerwebcontrol.axd... redirect request mysite.com/reserved.reportviewerwebcontrol.axd... i've noticed, link build within js (that inlcuded in axd): exportreport: function(format) { if (this.exporturlbase == null) return false; window.open(this.exporturlbase + encodeuricomponent(format), "_blank"); return true; }, the url axd stored in exporturlbase . how can change proxy serwer url? it possible modify exporturlbase field in javascript. report stored in placeholder somewhere on page, once found can create call _getinternalviewer() function on gain access exporturlbase. have @ following code: ...
Read more

time series - R growth rate calculation week over week on daily timeseries data -

-
i'm trying calculate w/w growth rates entirely in r. use excel, or preprocess ruby, that's not point. data.frame example date gpv type 1 2013-04-01 12900 office 2 2013-04-02 16232 office 3 2013-04-03 10035 office i want factored 'type' , need wrap date type column weeks. , calculate week on week growth. i think need ddply group week - custom function determines if date in given week or not? then, after that, use diff , find growth b/w weeks divided previous week. then i'll plot week/week growths, or use data.frame export it. this closed had same useful ideas. update: answer ggplot: all same below, use instead of plot ggplot(data.frame(week=seq(length(gr)), gr), aes(x=week,y=gr*100)) + geom_point() + geom_smooth(method='loess') + coord_cartesian(xlim = c(.95, 10.05)) + scale_x_discrete() + ggtitle('week on week growth rate, apr 1') + ylab('growth rate %') (old, correct answer using plot) w...
Read more