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i using uialertcontroller present dialog uitextfield , 1 uialertaction button labeled "ok". how disable button until number of characters (say 5 characters) input uitextfield ? add following property in header file @property(nonatomic, strong)uialertaction *okaction; then copy following code in viewdidload method of viewcontroller self.okaction = [uialertaction actionwithtitle:@"ok" style:uialertactionstyledefault handler:nil]; self.okaction.enabled = no; uialertcontroller *controller = [uialertcontroller alertcontrollerwithtitle:nil message:@"enter text" preferredstyle:uialertcontrollerstylealert]; [controller addtextfieldwithconfigurationhandler:^(uitextfield *textfield) { textfield.delegate = self; }]; [controller ...

when define function why might want use argument / parameter? benefits of using arguments? how useful? explain? thanks. var playlist = [ 'i did way', 'respect', 'imagine', 'born run', 'louie louie', 'maybellene' ]; function print(message) { document.write(message); } function printlist (list) { var listhtml = '<ol>'; (var = 0; < list.length; += 1) { listhtml += '<li>' + list[i] + '</li>'; } listhtml += '</ol>'; print(listhtml); } printlist(playlist); why have arguments been used in example above? arguments let apply same logic different data, meaning can re-use code. if don't use arguments there limitation on re-usability of functions or methods, can produce same output repeatedly, same how asking question on , on again no new information give same answer. in example, printlist function written such that, if wanted, generate mu...

my code doesn't have error, when try click button happens. can guys guess what's error? look @ photo you should swap second , third argument call msgbox. error occurs second argument should msgboxstyle , you're providing string ('ilist'). take @ documention on msdn more information.

in laravel 5.1 have 2 models.a city model , photo model. there polymorphic relation between city , photo. while updating city's photo with $city->photos()->updateorcreate($attributes,$values) the child time stamps updates. parent model's timestamp , city in case, not update accordingly , should manually call $city->touch() how can update parent model's timestamp when touching child model in laravel? for polymorphic relations class photo extends eloquent { protected $touches = ['city']; public function city() { return $this->morphto() // add function if not done } } class city extends eloquent { public function photos() { return $this->morphmany(app\photo::class, 'city'); } } in case, when photo updated, touches parent (city in situation). hope helps.

i hoping shed light on following build error when trying launch project in android studio imported form eclipse: error:execution failed task ':diveapp:dexdebug'. com.android.ide.common.process.processexception: org.gradle.process.internal.execexception: process 'command '/library/java/javavirtualmachines/jdk1.7.0_11.jdk/contents/home/bin/java'' finished non-zero exit value 2 i running on os x yosemite 10.10 , running java 8.0 update 60 (build 1.8.8_60-b27). url above seems reference jdk1.7.0_11jdk, not sure if issue or how check. cheers look @ gradle console log, see exact error. most of time because added same package few times - library different modules or in different places. if not - try clean - rebuild project. p.s. can change jdk project in file -> project structure also, there answers question error:execution failed task ':app:dexdebug'. com.android.ide.common.process.processexception

i'm having hard time making websites responsive downloaded basic template , navigation sample bootstrap, i'm wondering how edit navigation bar? because multiple css folders. tried creating new css file , editing through there can't seem make work. i'm trying making text centre in container/wrapper (i'm not sure called, each word in box , centre word in box html: <!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="x-ua-compatible" content="ie=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <!-- above 3 meta tags *must* come first in head; other head content must come *after* these tags --> <title>example</title> <!-- bootstrap --> <link href="css/bootstrap.min.css" rel="stylesheet"> <link href="navbar.css" rel=...

this question has answer here: attempt set non-property-list object nsuserdefaults 7 answers i'm working on swift application interacts shopify api through mobile buy sdk . i'm having issues saving cart device. else works fine, when use following code save cart device: func savecart() { nsuserdefaults.standarduserdefaults().setobject(cart, forkey: "cart") println("cart saved") } i receive following error: terminating app due uncaught exception 'nsinvalidargumentexception', reason: 'attempt insert non-property list object <buycart: 0x7fb5e30512f0> key cart' from nsuserdefaults class reference: the nsuserdefaults class provides convenience methods accessing common types such floats, doubles, integers, booleans, , urls. default object must property list, is, instance of (or collections c...