A UIImageView and UIStackView walk into a bar and sit next to each other

UI Frameworks UIKit
infiniteloop OP
Created Jan ’16
Replies 3
Boosts 0
Views 5.3k
Participants 3

Setup

  • I have a UIView with two top level elements:
    • A UIImageView bounded to the top, left and right of it's supverview.
    • A UIStackView bounded to the bottom, left and right of the superview. The stack view has many other nested stack views with labels and, images.
  • In between the two views is a vertical constraint.
  • The stack view and all of it's descendants have the default
    • Vertical Content Hugging Priority of 250.
    • Vertical Content Compression Resistance Priority of 750.
  • The image view has
    • Vertical Content Hugging Priority of 240.
    • Vertical Content Compression Resistance Priority of 740.


Desired Outcome

  • The stack view takes up its intrinisic size as defined by all of its subviews.
  • The image view expands to fill the remaining top of the view.


Success with just a UIView

I first set this up using a UIView instead of a UIImageView and it worked beautifully.

Failure with a UIImageView

When I later removed the UIView and replaced it with a UIImageView containing an image with a height less than the imageview height, the imageview shrinks and the stack view expands. I think the imagview shrinks according to the image it contains, and the stack view expands to fill in the remaining content.

Debugging

I've listed below the the output of _autolayoutTrace and constraintsAffectingLayoutForAxis for both setups.

With a UIView, there's no ambiguity in the layout.

With a UIImageView it shows ambigious layout for the stack view. But I think this is only because the stack view is forced to expand greater than its intrinsic size and there aren't enough rules to dictate what should occur.

Question

Am I correct in that the the intrinsic size of the image view is causing the stack view to expand?

And if so, how can I indicate to the auto layout engine that the intrinsic size of the stack view is more important than the intrinsic size of the image view?

Everything works with a UIView:

(lldb) po self.view.window?.performSelector("_autolayoutTrace")
•UIWindow:0x7f8139f29770
|   •UIView:0x7f8139f1f330
|   |   *UIStackView:0x7f8139f2cd50
|   |   |   *UIStackView:0x7f8139f2e420
|   |   |   |   *UILabel:0x7f8139f2e600'The case for doing someth...'
|   |   |   |   *UILabel:0x7f8139f30f20'Just when it's needed mos...'
|   |   |   *UIStackView:0x7f8139f33510
|   |   |   |   *UILabel:0x7f8139f336a0'By ANEED SHANKER'
|   |   |   |   *UIStackView:0x7f8139f33eb0
|   |   |   |   |   *UIStackView:0x7f8139f34040
|   |   |   |   |   |   *UIImageView:0x7f8139f34240
|   |   |   |   |   |   *UILabel:0x7f8139d23ef0'ANEEDSHARKER'
|   |   |   |   |   *UIStackView:0x7f8139d25330
|   |   |   |   |   |   *UIImageView:0x7f8139d255d0
|   |   |   |   |   |   *UILabel:0x7f8139f396a0'ANEEDSHARKER'
|   |   |   *UIStackView:0x7f8139f3b690
|   |   |   |   *UILabel:0x7f8139f3b840'ab.com'
|   |   |   |   *UIStackView:0x7f8139f3bc60
|   |   |   |   |   *UIStackView:0x7f8139f3bdf0
|   |   |   |   |   |   *UIImageView:0x7f8139f3bfa0
|   |   |   |   |   |   *UILabel:0x7f8139f3c220'AB'
|   |   |   |   |   *UIStackView:0x7f8139f3cff0
|   |   |   |   |   |   *UIImageView:0x7f8139f3d180
|   |   |   |   |   |   *UILabel:0x7f8139f3d3d0'ABCDEFNEWS'
|   |   |   *UILabel:0x7f8139f3f900'Lorem ipsum dolor sit ame...'
|   |   *UIView:0x7f8139f41850
|   |   *_UILayoutGuide:0x7f8139f41bd0
|   |   *_UILayoutGuide:0x7f8139f42940

Legend:
  * - is laid out with auto layout
  + - is laid out manually, but is represented in the layout engine because translatesAutoresizingMaskIntoConstraints = YES
  • - layout engine host))

(lldb) e let $view = unsafeBitCast(0x7f8139f41850, UIView.self)
(lldb) po $view.constraintsAffectingLayoutForAxis(UILayoutConstraintAxis(rawValue:1)!)
▿ 40 elements
  - [0] : <NSContentSizeLayoutConstraint:0x7f8139f4ba70 V:[UILabel:0x7f8139f2e600'The case for doing someth...'(57.5)] Hug:250 CompressionResistance:750>
  - [1] : <NSContentSizeLayoutConstraint:0x7f8139f4c150 V:[UILabel:0x7f8139f30f20'Just when it's needed mos...'(26.5)] Hug:250 CompressionResistance:750>
  - [2] : <NSContentSizeLayoutConstraint:0x7f8139f43ff0 V:[UILabel:0x7f8139f336a0'By ANEED SHANKER'(17)] Hug:250 CompressionResistance:750>
  - [3] : <NSContentSizeLayoutConstraint:0x7f8139f52810 V:[UILabel:0x7f8139f396a0'ANEEDSHARKER'(13.5)] Hug:250 CompressionResistance:750>
  - [4] : <NSContentSizeLayoutConstraint:0x7f8139f55d20 V:[UILabel:0x7f8139f3b840'ab.com'(17)] Hug:250 CompressionResistance:750>
  - [5] : <NSContentSizeLayoutConstraint:0x7f8139f5ab00 V:[UILabel:0x7f8139f3c220'AB'(13.5)] Hug:250 CompressionResistance:750>
  - [6] : <NSContentSizeLayoutConstraint:0x7f8139f3f6d0 V:[UILabel:0x7f8139f3f900'Lorem ipsum dolor sit ame...'(11)] Hug:250 CompressionResistance:750>
  - [7] : <NSLayoutConstraint:0x7f8139f43540 V:|-(0)-[UIView:0x7f8139f41850]   (Names: '|':UIView:0x7f8139f1f330 )>
  - [8] : <NSLayoutConstraint:0x7f8139f435e0 V:[UIStackView:0x7f8139f2cd50]-(8)-|   (Names: '|':UIView:0x7f8139f1f330 )>
  - [9] : <NSLayoutConstraint:0x7f8139f43630 V:[UIView:0x7f8139f41850]-(8)-[UIStackView:0x7f8139f2cd50]>
  - [10] : <NSLayoutConstraint:0x7f8139f54820 'UISV-alignment' UIImageView:0x7f8139d255d0.centerY == UILabel:0x7f8139f396a0'ANEEDSHARKER'.centerY>
  - [11] : <NSLayoutConstraint:0x7f8139f55a70 'UISV-alignment' UIStackView:0x7f8139f34040.bottom == UIStackView:0x7f8139d25330.bottom>
  - [12] : <NSLayoutConstraint:0x7f8139f53ff0 'UISV-alignment' UIStackView:0x7f8139f34040.top == UIStackView:0x7f8139d25330.top>
  - [13] : <NSLayoutConstraint:0x7f8139f5cda0 'UISV-alignment' UIImageView:0x7f8139f3bfa0.centerY == UILabel:0x7f8139f3c220'AB'.centerY>
  - [14] : <NSLayoutConstraint:0x7f8139f37750 'UISV-canvas-connection' UIStackView:0x7f8139f2e420.top == UILabel:0x7f8139f2e600'The case for doing someth...'.top>
  - [15] : <NSLayoutConstraint:0x7f8139f4c580 'UISV-canvas-connection' V:[UILabel:0x7f8139f30f20'Just when it's needed mos...']-(0)-|   (Names: '|':UIStackView:0x7f8139f2e420 )>
  - [16] : <NSLayoutConstraint:0x7f8139f53b80 'UISV-canvas-connection' UIStackView:0x7f8139d25330.top == _UILayoutSpacer:0x7f8139f53320'UISV-alignment-spanner'.top>
  - [17] : <NSLayoutConstraint:0x7f8139f53d60 'UISV-canvas-connection' UIStackView:0x7f8139d25330.centerY == UIImageView:0x7f8139d255d0.centerY>
  - [18] : <NSLayoutConstraint:0x7f8139f3ac40 'UISV-canvas-connection' UIStackView:0x7f8139f33eb0.top == UIStackView:0x7f8139f34040.top>
  - [19] : <NSLayoutConstraint:0x7f8139f4fd30 'UISV-canvas-connection' V:[UIStackView:0x7f8139f34040]-(0)-|   (Names: '|':UIStackView:0x7f8139f33eb0 )>
  - [20] : <NSLayoutConstraint:0x7f8139f55780 'UISV-canvas-connection' UIStackView:0x7f8139f33510.top == UILabel:0x7f8139f336a0'By ANEED SHANKER'.top>
  - [21] : <NSLayoutConstraint:0x7f8139f52240 'UISV-canvas-connection' V:[UIStackView:0x7f8139f33eb0]-(0)-|   (Names: '|':UIStackView:0x7f8139f33510 )>
  - [22] : <NSLayoutConstraint:0x7f8139f5c120 'UISV-canvas-connection' UIStackView:0x7f8139f3bdf0.top == _UILayoutSpacer:0x7f8139f5b6c0'UISV-alignment-spanner'.top>
  - [23] : <NSLayoutConstraint:0x7f8139f5c2f0 'UISV-canvas-connection' UIStackView:0x7f8139f3bdf0.centerY == UIImageView:0x7f8139f3bfa0.centerY>
  - [24] : <NSLayoutConstraint:0x7f8139f3ecb0 'UISV-canvas-connection' UIStackView:0x7f8139f3bc60.top == UIStackView:0x7f8139f3bdf0.top>
  - [25] : <NSLayoutConstraint:0x7f8139f5e300 'UISV-canvas-connection' V:[UIStackView:0x7f8139f3bdf0]-(0)-|   (Names: '|':UIStackView:0x7f8139f3bc60 )>
  - [26] : <NSLayoutConstraint:0x7f8139f5bc90 'UISV-canvas-connection' UIStackView:0x7f8139f3b690.top == UILabel:0x7f8139f3b840'ab.com'.top>
  - [27] : <NSLayoutConstraint:0x7f8139f5d040 'UISV-canvas-connection' V:[UIStackView:0x7f8139f3bc60]-(0)-|   (Names: '|':UIStackView:0x7f8139f3b690 )>
  - [28] : <NSLayoutConstraint:0x7f8139f64e20 'UISV-canvas-connection' UIStackView:0x7f8139f2cd50.top == UIStackView:0x7f8139f2e420.top>
  - [29] : <NSLayoutConstraint:0x7f8139f65b20 'UISV-canvas-connection' V:[UILabel:0x7f8139f3f900'Lorem ipsum dolor sit ame...']-(0)-|   (Names: '|':UIStackView:0x7f8139f2cd50 )>
  - [30] : <NSLayoutConstraint:0x7f8139f4c950 'UISV-spacing' V:[UILabel:0x7f8139f2e600'The case for doing someth...']-(0)-[UILabel:0x7f8139f30f20'Just when it's needed mos...']>
  - [31] : <NSLayoutConstraint:0x7f8139f560a0 'UISV-spacing' V:[UILabel:0x7f8139f336a0'By ANEED SHANKER']-(2)-[UIStackView:0x7f8139f33eb0]>
  - [32] : <NSLayoutConstraint:0x7f8139f61260 'UISV-spacing' V:[UILabel:0x7f8139f3b840'ab.com']-(2)-[UIStackView:0x7f8139f3bc60]>
  - [33] : <NSLayoutConstraint:0x7f8139f66000 'UISV-spacing' V:[UIStackView:0x7f8139f2e420]-(5)-[UIStackView:0x7f8139f33510]>
  - [34] : <NSLayoutConstraint:0x7f8139f4ca40 'UISV-spacing' V:[UIStackView:0x7f8139f33510]-(5)-[UIStackView:0x7f8139f3b690]>
  - [35] : <NSLayoutConstraint:0x7f8139f54950 'UISV-spacing' V:[UIStackView:0x7f8139f3b690]-(5)-[UILabel:0x7f8139f3f900'Lorem ipsum dolor sit ame...']>
  - [36] : <NSLayoutConstraint:0x7f8139f507a0 'UISV-spanning-boundary' _UILayoutSpacer:0x7f8139f53320'UISV-alignment-spanner'.top <= UILabel:0x7f8139f396a0'ANEEDSHARKER'.top>
  - [37] : <NSLayoutConstraint:0x7f8139f5ba50 'UISV-spanning-boundary' _UILayoutSpacer:0x7f8139f5b6c0'UISV-alignment-spanner'.top <= UILabel:0x7f8139f3c220'AB'.top>
  - [38] : <NSLayoutConstraint:0x7f8139f65270 'UIView-Encapsulated-Layout-Height' V:[UIView:0x7f8139f1f330(667)]>
  - [39] : <NSAutoresizingMaskLayoutConstraint:0x7f8139f26070 h=-&- v=-&- 'UIView-Encapsulated-Layout-Top' V:|-(0)-[UIView:0x7f8139f1f330]   (Names: '|':UIWindow:0x7f8139f29770 )>

(lldb) e let $stackview = unsafeBitCast(0x7f8139f2cd50, UIStackView.self)
(lldb) po $stackview.constraintsAffectingLayoutForAxis(UILayoutConstraintAxis(rawValue:1)!)
▿ 38 elements
  - [0] : <NSContentSizeLayoutConstraint:0x7f8139f4ba70 V:[UILabel:0x7f8139f2e600'The case for doing someth...'(57.5)] Hug:250 CompressionResistance:750>
  - [1] : <NSContentSizeLayoutConstraint:0x7f8139f4c150 V:[UILabel:0x7f8139f30f20'Just when it's needed mos...'(26.5)] Hug:250 CompressionResistance:750>
  - [2] : <NSContentSizeLayoutConstraint:0x7f8139f43ff0 V:[UILabel:0x7f8139f336a0'By ANEED SHANKER'(17)] Hug:250 CompressionResistance:750>
  - [3] : <NSContentSizeLayoutConstraint:0x7f8139f52810 V:[UILabel:0x7f8139f396a0'ANEEDSHARKER'(13.5)] Hug:250 CompressionResistance:750>
  - [4] : <NSContentSizeLayoutConstraint:0x7f8139f55d20 V:[UILabel:0x7f8139f3b840'ab.com'(17)] Hug:250 CompressionResistance:750>
  - [5] : <NSContentSizeLayoutConstraint:0x7f8139f5ab00 V:[UILabel:0x7f8139f3c220'AB'(13.5)] Hug:250 CompressionResistance:750>
  - [6] : <NSContentSizeLayoutConstraint:0x7f8139f3f6d0 V:[UILabel:0x7f8139f3f900'Lorem ipsum dolor sit ame...'(11)] Hug:250 CompressionResistance:750>
  - [7] : <NSLayoutConstraint:0x7f8139f435e0 V:[UIStackView:0x7f8139f2cd50]-(8)-|   (Names: '|':UIView:0x7f8139f1f330 )>
  - [8] : <NSLayoutConstraint:0x7f8139f54820 'UISV-alignment' UIImageView:0x7f8139d255d0.centerY == UILabel:0x7f8139f396a0'ANEEDSHARKER'.centerY>
  - [9] : <NSLayoutConstraint:0x7f8139f55a70 'UISV-alignment' UIStackView:0x7f8139f34040.bottom == UIStackView:0x7f8139d25330.bottom>
  - [10] : <NSLayoutConstraint:0x7f8139f53ff0 'UISV-alignment' UIStackView:0x7f8139f34040.top == UIStackView:0x7f8139d25330.top>
  - [11] : <NSLayoutConstraint:0x7f8139f5cda0 'UISV-alignment' UIImageView:0x7f8139f3bfa0.centerY == UILabel:0x7f8139f3c220'AB'.centerY>
  - [12] : <NSLayoutConstraint:0x7f8139f37750 'UISV-canvas-connection' UIStackView:0x7f8139f2e420.top == UILabel:0x7f8139f2e600'The case for doing someth...'.top>
  - [13] : <NSLayoutConstraint:0x7f8139f4c580 'UISV-canvas-connection' V:[UILabel:0x7f8139f30f20'Just when it's needed mos...']-(0)-|   (Names: '|':UIStackView:0x7f8139f2e420 )>
  - [14] : <NSLayoutConstraint:0x7f8139f53b80 'UISV-canvas-connection' UIStackView:0x7f8139d25330.top == _UILayoutSpacer:0x7f8139f53320'UISV-alignment-spanner'.top>
  - [15] : <NSLayoutConstraint:0x7f8139f53d60 'UISV-canvas-connection' UIStackView:0x7f8139d25330.centerY == UIImageView:0x7f8139d255d0.centerY>
  - [16] : <NSLayoutConstraint:0x7f8139f3ac40 'UISV-canvas-connection' UIStackView:0x7f8139f33eb0.top == UIStackView:0x7f8139f34040.top>
  - [17] : <NSLayoutConstraint:0x7f8139f4fd30 'UISV-canvas-connection' V:[UIStackView:0x7f8139f34040]-(0)-|   (Names: '|':UIStackView:0x7f8139f33eb0 )>
  - [18] : <NSLayoutConstraint:0x7f8139f55780 'UISV-canvas-connection' UIStackView:0x7f8139f33510.top == UILabel:0x7f8139f336a0'By ANEED SHANKER'.top>
  - [19] : <NSLayoutConstraint:0x7f8139f52240 'UISV-canvas-connection' V:[UIStackView:0x7f8139f33eb0]-(0)-|   (Names: '|':UIStackView:0x7f8139f33510 )>
  - [20] : <NSLayoutConstraint:0x7f8139f5c120 'UISV-canvas-connection' UIStackView:0x7f8139f3bdf0.top == _UILayoutSpacer:0x7f8139f5b6c0'UISV-alignment-spanner'.top>
  - [21] : <NSLayoutConstraint:0x7f8139f5c2f0 'UISV-canvas-connection' UIStackView:0x7f8139f3bdf0.centerY == UIImageView:0x7f8139f3bfa0.centerY>
  - [22] : <NSLayoutConstraint:0x7f8139f3ecb0 'UISV-canvas-connection' UIStackView:0x7f8139f3bc60.top == UIStackView:0x7f8139f3bdf0.top>
  - [23] : <NSLayoutConstraint:0x7f8139f5e300 'UISV-canvas-connection' V:[UIStackView:0x7f8139f3bdf0]-(0)-|   (Names: '|':UIStackView:0x7f8139f3bc60 )>
  - [24] : <NSLayoutConstraint:0x7f8139f5bc90 'UISV-canvas-connection' UIStackView:0x7f8139f3b690.top == UILabel:0x7f8139f3b840'ab.com'.top>
  - [25] : <NSLayoutConstraint:0x7f8139f5d040 'UISV-canvas-connection' V:[UIStackView:0x7f8139f3bc60]-(0)-|   (Names: '|':UIStackView:0x7f8139f3b690 )>
  - [26] : <NSLayoutConstraint:0x7f8139f64e20 'UISV-canvas-connection' UIStackView:0x7f8139f2cd50.top == UIStackView:0x7f8139f2e420.top>
  - [27] : <NSLayoutConstraint:0x7f8139f65b20 'UISV-canvas-connection' V:[UILabel:0x7f8139f3f900'Lorem ipsum dolor sit ame...']-(0)-|   (Names: '|':UIStackView:0x7f8139f2cd50 )>
  - [28] : <NSLayoutConstraint:0x7f8139f4c950 'UISV-spacing' V:[UILabel:0x7f8139f2e600'The case for doing someth...']-(0)-[UILabel:0x7f8139f30f20'Just when it's needed mos...']>
  - [29] : <NSLayoutConstraint:0x7f8139f560a0 'UISV-spacing' V:[UILabel:0x7f8139f336a0'By ANEED SHANKER']-(2)-[UIStackView:0x7f8139f33eb0]>
  - [30] : <NSLayoutConstraint:0x7f8139f61260 'UISV-spacing' V:[UILabel:0x7f8139f3b840'ab.com']-(2)-[UIStackView:0x7f8139f3bc60]>
  - [31] : <NSLayoutConstraint:0x7f8139f66000 'UISV-spacing' V:[UIStackView:0x7f8139f2e420]-(5)-[UIStackView:0x7f8139f33510]>
  - [32] : <NSLayoutConstraint:0x7f8139f4ca40 'UISV-spacing' V:[UIStackView:0x7f8139f33510]-(5)-[UIStackView:0x7f8139f3b690]>
  - [33] : <NSLayoutConstraint:0x7f8139f54950 'UISV-spacing' V:[UIStackView:0x7f8139f3b690]-(5)-[UILabel:0x7f8139f3f900'Lorem ipsum dolor sit ame...']>
  - [34] : <NSLayoutConstraint:0x7f8139f507a0 'UISV-spanning-boundary' _UILayoutSpacer:0x7f8139f53320'UISV-alignment-spanner'.top <= UILabel:0x7f8139f396a0'ANEEDSHARKER'.top>
  - [35] : <NSLayoutConstraint:0x7f8139f5ba50 'UISV-spanning-boundary' _UILayoutSpacer:0x7f8139f5b6c0'UISV-alignment-spanner'.top <= UILabel:0x7f8139f3c220'AB'.top>
  - [36] : <NSLayoutConstraint:0x7f8139f65270 'UIView-Encapsulated-Layout-Height' V:[UIView:0x7f8139f1f330(667)]>
  - [37] : <NSAutoresizingMaskLayoutConstraint:0x7f8139f26070 h=-&- v=-&- 'UIView-Encapsulated-Layout-Top' V:|-(0)-[UIView:0x7f8139f1f330]   (Names: '|':UIWindow:0x7f8139f29770 )>


But doesn't work with a UIImageView:

(lldb) po self.view.window?.performSelector("_autolayoutTrace")
•UIWindow:0x7fdb2b690700 - AMBIGUOUS LAYOUT
|   •UIView:0x7fdb2b71afc0
|   |   *UIImageView:0x7fdb2b713e30
|   |   *UIStackView:0x7fdb2b424aa0
|   |   |   *UIStackView:0x7fdb2b425750
|   |   |   |   *UILabel:0x7fdb2b425930'The case for doing someth...'
|   |   |   |   *UILabel:0x7fdb2b4285d0'Just when it's needed mos...'
|   |   |   *UIStackView:0x7fdb2b42ab70- AMBIGUOUS LAYOUT for UIStackView:0x7fdb2b42ab70.Height{id: 200}
|   |   |   |   *UILabel:0x7fdb2b42ad00'By ANEED SHANKER'
|   |   |   |   *UIStackView:0x7fdb2b42b7e0- AMBIGUOUS LAYOUT for UIStackView:0x7fdb2b42b7e0.Height{id: 186}
|   |   |   |   |   *UIStackView:0x7fdb2b42b970- AMBIGUOUS LAYOUT for UIStackView:0x7fdb2b42b970.Height{id: 113}
|   |   |   |   |   |   *UIImageView:0x7fdb2b42bc30- AMBIGUOUS LAYOUT for UIImageView:0x7fdb2b42bc30.minY{id: 116}
|   |   |   |   |   |   *UILabel:0x7fdb2b42f1e0'ANEEDSHARKER'- AMBIGUOUS LAYOUT for UILabel:0x7fdb2b42f1e0'ANEEDSHARKER'.minY{id: 131}
|   |   |   |   |   *UIStackView:0x7fdb2b430710- AMBIGUOUS LAYOUT for UIStackView:0x7fdb2b430710.Height{id: 177}
|   |   |   |   |   |   *UIImageView:0x7fdb2b4308a0- AMBIGUOUS LAYOUT for UIImageView:0x7fdb2b4308a0.minY{id: 156}
|   |   |   |   |   |   *UILabel:0x7fdb2b721290'ANEEDSHARKER'- AMBIGUOUS LAYOUT for UILabel:0x7fdb2b721290'ANEEDSHARKER'.minY{id: 173}
|   |   |   *UIStackView:0x7fdb2b7232a0- AMBIGUOUS LAYOUT for UIStackView:0x7fdb2b7232a0.minY{id: 325}, UIStackView:0x7fdb2b7232a0.Height{id: 337}
|   |   |   |   *UILabel:0x7fdb2b723450'ab.com'- AMBIGUOUS LAYOUT for UILabel:0x7fdb2b723450'ab.com'.minY{id: 335}
|   |   |   |   *UIStackView:0x7fdb2b723870- AMBIGUOUS LAYOUT for UIStackView:0x7fdb2b723870.minY{id: 252}, UIStackView:0x7fdb2b723870.Height{id: 323}
|   |   |   |   |   *UIStackView:0x7fdb2b723a00- AMBIGUOUS LAYOUT for UIStackView:0x7fdb2b723a00.minY{id: 248}, UIStackView:0x7fdb2b723a00.Height{id: 250}
|   |   |   |   |   |   *UIImageView:0x7fdb2b723bb0- AMBIGUOUS LAYOUT for UIImageView:0x7fdb2b723bb0.minY{id: 253}
|   |   |   |   |   |   *UILabel:0x7fdb2b723e30'AB'- AMBIGUOUS LAYOUT for UILabel:0x7fdb2b723e30'AB'.minY{id: 268}
|   |   |   |   |   *UIStackView:0x7fdb2b724c00- AMBIGUOUS LAYOUT for UIStackView:0x7fdb2b724c00.minY{id: 294}, UIStackView:0x7fdb2b724c00.Height{id: 314}
|   |   |   |   |   |   *UIImageView:0x7fdb2b724d90- AMBIGUOUS LAYOUT for UIImageView:0x7fdb2b724d90.minY{id: 293}
|   |   |   |   |   |   *UILabel:0x7fdb2b724fe0'ABCDEFNEWS'- AMBIGUOUS LAYOUT for UILabel:0x7fdb2b724fe0'ABCDEFNEWS'.minY{id: 310}
|   |   |   *UILabel:0x7fdb2b727610'Lorem ipsum dolor sit ame...'
|   |   *_UILayoutGuide:0x7fdb2b7293b0
|   |   *_UILayoutGuide:0x7fdb2b72a0f0

Legend:
  * - is laid out with auto layout
  + - is laid out manually, but is represented in the layout engine because translatesAutoresizingMaskIntoConstraints = YES
  • - layout engine host

(lldb) e let $imageview = unsafeBitCast(0x7fdb2b713e30, UIImageView.self)
(lldb) po $imageview.constraintsAffectingLayoutForAxis(UILayoutConstraintAxis(rawValue:1)!)
▿ 5 elements
  - [0] : <_UILayoutSupportConstraint:0x7fdb2b723820 V:[_UILayoutGuide:0x7fdb2b7293b0(0)]>
  - [1] : <_UILayoutSupportConstraint:0x7fdb2b70f0d0 V:|-(0)-[_UILayoutGuide:0x7fdb2b7293b0]   (Names: '|':UIView:0x7fdb2b71afc0 )>
  - [2] : <NSContentSizeLayoutConstraint:0x7fdb2b68cbb0 V:[UIImageView:0x7fdb2b713e30(360)] Hug:240 CompressionResistance:740>
  - [3] : <NSLayoutConstraint:0x7fdb2b72ab20 V:[_UILayoutGuide:0x7fdb2b7293b0]-(0)-[UIImageView:0x7fdb2b713e30]>
  - [4] : <NSAutoresizingMaskLayoutConstraint:0x7fdb2b515900 h=-&- v=-&- 'UIView-Encapsulated-Layout-Top' V:|-(0)-[UIView:0x7fdb2b71afc0]   (Names: '|':UIWindow:0x7fdb2b690700 )>


(lldb) e let $stackview = unsafeBitCast(0x7fdb2b424aa0, UIStackView.self)
(lldb) po $stackview.constraintsAffectingLayoutForAxis(UILayoutConstraintAxis(rawValue:1)!)
▿ 8 elements
  - [0] : <_UILayoutSupportConstraint:0x7fdb2b723820 V:[_UILayoutGuide:0x7fdb2b7293b0(0)]>
  - [1] : <_UILayoutSupportConstraint:0x7fdb2b70f0d0 V:|-(0)-[_UILayoutGuide:0x7fdb2b7293b0]   (Names: '|':UIView:0x7fdb2b71afc0 )>
  - [2] : <NSContentSizeLayoutConstraint:0x7fdb2b68cbb0 V:[UIImageView:0x7fdb2b713e30(360)] Hug:240 CompressionResistance:740>
  - [3] : <NSLayoutConstraint:0x7fdb2b72ab20 V:[_UILayoutGuide:0x7fdb2b7293b0]-(0)-[UIImageView:0x7fdb2b713e30]>
  - [4] : <NSLayoutConstraint:0x7fdb2b72abc0 V:[UIImageView:0x7fdb2b713e30]-(8)-[UIStackView:0x7fdb2b424aa0]>
  - [5] : <NSLayoutConstraint:0x7fdb2b72ab70 V:[UIStackView:0x7fdb2b424aa0]-(8)-|   (Names: '|':UIView:0x7fdb2b71afc0 )>
  - [6] : <NSLayoutConstraint:0x7fdb2b533e00 'UIView-Encapsulated-Layout-Height' V:[UIView:0x7fdb2b71afc0(667)]>
  - [7] : <NSAutoresizingMaskLayoutConstraint:0x7fdb2b515900 h=-&- v=-&- 'UIView-Encapsulated-Layout-Top' V:|-(0)-[UIView:0x7fdb2b71afc0]   (Names: '|':UIWindow:0x7fdb2b690700 )>
Replies  3
Boosts  0
Views  5.3k
Participants  3
anils OP
Jan ’16

Have you tried changing the content mode of your uiimageview

0
infiniteloop OP
Jan ’16

The image view content mode is set to aspect fill because the images are coming from web and are all different sizes and aspect ratios.


I really need the image view to expand and then for the image to fill that space.

0
KMT OP
Jan ’16

Stackview says "Sorry I'm late - what did I miss?"

0
A UIImageView and UIStackView walk into a bar and sit next to each other
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