"IOS" screen fit Nslayoutconstraint

Objective

How to achieve a picture on the iphone and ipad display different sizes, I learned that there are three ways: direct handwriting code dynamically add constraints; Nslayoutconstraint associated to the Viewcontroller viewdidload inside plus judgment assignment , with size classes (this is not very good at present). Here is a way to share a direct fit within the storyboard.

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Body

Import Foundation

classNslayoutconstraintex:nslayoutconstraint {

@IBInspectable
var ipad:cgfloat =0{
Didset {
ifDeviceutils.isipad () {
Constant = ipad
}
}
}

@IBInspectable
var iphone4:cgfloat =0{
Didset {
//640 x 960
ifDeviceutils.isiphone () && deviceutils.getscreensize (). Height = =960.0{
Constant = Self.iphone4
}
}
}

@IBInspectable
var iphone5:cgfloat =0{
Didset {
//640 x 1136
ifDeviceutils.isiphone () && deviceutils.getscreensize (). Height = =1136.0{
Constant = Self.iphone5
}
}
}

@IBInspectable
var iphone6:cgfloat =0{
Didset {
//x 1334
ifDeviceutils.isiphone () && deviceutils.getscreensize (). Height = =1334.0{
Constant = Self.iphone6
}
}
}

@IBInspectable
var iphone6plus:cgfloat =0{
Didset {
//1242 x 2208
ifDeviceutils.isiphone () && deviceutils.getscreensize (). Height >=1920.0{
Constant = Self.iphone6plus
}
}
}
}

Usage:

Modify the current constraint so that it uses Nslayoutconstraintex, with the following effect:

Note that the user Defined Runtime attributes this column, if you remove a custom attribute, there may be a residue on this side, delete the remaining item can be removed. and the module column. If the show none indicates that using a custom class fails, it would be nice to remove the class and re-enact it.

The default is the iphone layout, so you can use a large size image on your ipad.

End

Bought this auto layout development cheats, continue to learn and think about screen adaptation aspects of the content.

"IOS" screen fit Nslayoutconstraint