ios - How to set a constraint using percentage? -


just direct question, had spent many hours trying find working solution faild.

in xcode, storyboard, how set constraint 1 view can located 30% of total window height top of superview? , need way supported ios devices of orientations.

please see illustration attached.enter image description here

thank help!!

update

sorry, have misunderstood problem.

you'll need add constraints code (the xconstraint totally arbitrary, must need define x, y positions, width , height, unambiguous layout):

@iboutlet weak var imageview: uiimageview!      override func viewdidlayoutsubviews() {         super.viewdidlayoutsubviews()          let yconstraint = nslayoutconstraint(item: imageview, attribute: .top, relatedby: .equal, toitem: view, attribute: .top, multiplier: 1, constant: view.bounds.height / 3)          let xconstraint = nslayoutconstraint(item: imageview, attribute: .leading, relatedby: .equal, toitem: view, attribute: .leading, multiplier: 1, constant: 30)          nslayoutconstraint.activateconstraints([yconstraint, xconstraint])     }

this way, equation be:

imageview.top = 1 * view.top + (view.width / 3)

original answer

auto layout uses following equation constraints:

aview.property = multiplier * bview.property + constant

based on this, can add equal width/height constraint, add multiplier:

enter image description here

so equation be:

view.height = 0.3 * superview.height + 0

Comments

Post a Comment

Popular posts from this blog

c++ - Difference between pre and post decrement in recursive function argument -

i have following sample code used pre-decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(--c); cout << c << endl; return; } } this function give output input 4 : dp3 dp2 dp1 dp0 0 1 2 3 but when use post decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(c--); cout << c << endl; return; } } output goes in infinite loop dp4 can explain me in detail why happens ? this happens because function(c--) called same value of c , when finishes c decremented. recursively called, hence called same value no chance of return , hit stack overflow error. assume this, int x = 1, y = 0; y = x++ result y == 1 , x == 2. if y = ++x , bot x , y 2.
Read more

php - How can I echo out this array? -

i don't know how go grabbing data in variable , put foreach loop. class tree{ private $info = array( array('name'=>'jim','state'=>'nu','company'=>'nu','phone'=>array('cell'=>'5615111111','office'=>'5611111111'),'email'=>array('primary'=>'exs@example.com','ex@there.com')), array('name'=>'joe smith','city'=>'phoenix','phone'=>'4805551111','email'=>'jsmith@some_email.com'), array('name'=>'john doe','city'=>'chandler','company'=>'doe co.','email'=>array('jdoe@gmail.com','personal'=>'email@email.com'),'phone'=>'6025550002') ); } if you're inside of class, can access private variable using $this->variablename . example, i...
Read more

javascript - IE11 incompatibility with jQuery's 'readonly'? -

the code i'm running has no issues in firefox, or chrome. user typing 1 textbox, tabs next , can continue typing that. when run webpage on ie11, user tabs next textbox , can't type in. textbox has double-clicked before user can insert anything. i've googled , seems ie give problems when using older jquery (i.e. prefers 'prop' 'attr' ). in code below jquery's readonly keyword being used in way ie11 no longer recognise/accept? i assume issue readonly , removeclass('ignore') working expected. //when focus on textbox 1 $("#field1").focus(function() { //remove readonly property textbox 1 $('#field1').prop('readonly', false).removeclass('ignore'); //add readonly property other textboxes $('#field2, #field3, #field4') .prop('readonly', 'readonly').addclass('ignore').val(''); }); i'm using jquery 2.1.3 ...
Read more