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UIStackView : More than an Introduction
- 1. UISTACKVIEW PROVIDES A STREAMLINEDINTERFACE FOR LAYING OUT A COLLECTION OF VIEWS IN EITHER A COLUMN OR A ROW.
- 2. DON’T NEED YOU! I HAVE AUTOLAYOUT FOR THAT…
- 3. AUTOLAYOUT AutoLayout ! Auto Layoutdynamically calculates the size and position of all the views in your view hierarchy, based on constraints placed on those views
- 4. UISTACKVIEW The Real AutoLayout Stackviews lets you leverage the power of Auto Layout, creating user interfaces that can dynamically adapt to the device’s orientation, screen size, and any changes in the available space.
- 5. INTRINSIC CONTENT SIZE????? BEFORE WE BEGIN… CHCR PRIORITIES ???
- 6. INTRINSIC CONTENT SIZE ▸The minimum space needed to express the full view content without squeezing or clipping that data https://developer.apple.com/library/content/documentation/UserExperience/Conceptual/AutolayoutPG/ AnatomyofaConstraint.html#//apple_ref/doc/uid/TP40010853-CH9-SW21
- 7. CONTENT HUGGING, COMPRESSIONRESISTANCE PRIORITY https://littlebitesofcocoa.com/69-compression-resistance-content-hugging (CHCR PRIORITIES)
- 8. ATTRIBUTES ▸ Axis ▸ Alignment ▸Distribution ▸ Spacing
- 9. ALIGNMENT | DISTRIBUTION| SPACING Source : https://developer.apple.com/reference/uikit/uistackview
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- 12. ALIGNMENT : HORIZONTALSTACKVIEW ▸ Top ▸ Center ▸ Bottom ▸ Fill
- 13. ALIGNMENT : VERTICALSTACKVIEW ▸ Leading ▸ Center ▸ Trailing ▸ Fill
- 14. DISTRIBUTION (1/3) ▸ Fill ▸Fill Equally ▸ Fill Proportionally (Test in code !) ▸ Equal Centering ▸ Equal Spacing
- 15. DISTRIBUTION (2/3) ▸ Fill ▸Attempts to fill the space along the axis with the items. ▸ Sizes each item via its intrinsicContentSize. ▸ Uses each item’s contentCompressionResistancePriority and contentHuggingPriority to determine which items to grow or shrink. ▸ contentCompressionResistancePriority – The view with the lowest value gets truncated when there is not enough space to fit everything’s intrinsicContentSize. ▸ contentHuggingPriority – The view with the lowest value gets expanded beyond its intrinsicContentSize when there is leftover space to fill.
- 16. DISTRIBUTION (3/3) ▸ FillEqually : Resizes each item equally along the axis to fill the available space. Also takes into account spacing between items. ▸ Fill Proportionally : Resizes each item by proportionally distributing the extra space based on their intrinsicContentSize along the axis. ▸ Equal Centering :Sizes each item based on its intrinsicContentSize and spaces them all equally along the axis. Uses spacing as a minimum value. ▸ Equal Spacing : Sizes each item based on its intrinsicContentSize and spaces them all equally from each others center along the axis. Uses spacing as a minimum value.
- 17. POSITIONING AND SIZINGTHE STACK VIEW ‣ You are responsible for defining the position and (optionally) the size of the stack view. The stack view then manages the layout and size of its content.
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- 20. Define the positiononly. Define the stack’s size along its axis. Define the stack’s size perpendicular to its axis. Define the size and position of the stack view https://developer.apple.com/reference/uikit/uistackview COMMON UISTACKVIEW LAYOUTS
- 21. PROGRAMMATICALLY UIView UIStackView addSubview: addArrangedSubview: insertSubview:atIndex:insertArrangedSubview:atIndex: subviews arrangedSubviews
- 22. PECULIARITIES ▸ Non-rendering Subclassof UIView ▸ Be careful with removeArrangedSubview: method. (Avoid It) ▸ hidden property is animatable !
- 23. USEFUL LINKS :UISTACKVIEW ▸ https://www.raywenderlich.com/114552/uistackview-tutorial- introducing-stack-views ▸ http://www.runtimecrash.com/2015/09/17/exploring-uistackview/ ▸ https://developer.apple.com/reference/uikit/uistackview ▸ http://www.thinkandbuild.it/introduction-to-uistackview/ ▸ https://www.raizlabs.com/dev/2016/04/uistackview/ ▸ https://spin.atomicobject.com/2016/06/22/uistackview-distribution/ ▸ http://angelolloqui.com/blog/36-Oddities-of-UIStackView
- 24. USEFUL LINKS :CHCR PRIORITIES ▸ https://littlebitesofcocoa.com/69-compression-resistance-content-hugging ▸ https://developer.apple.com/library/content/documentation/ UserExperience/Conceptual/AutolayoutPG/AnatomyofaConstraint.html#// apple_ref/doc/uid/TP40010853-CH9-SW19 ▸ https://krakendev.io/blog/autolayout-magic-like-harry-potter-but-real ▸ http://tuchangwei.github.io/2015/09/14/Cocoa-Autolayout-content- hugging-vs-content-compression-resistance-priority/ ▸ http://www.iosinsight.com/content-hugging-and-compression-resistance- explained/
- 25. LASTLY, ON ACOMPLETELY DIFFERENT NOTE, ONE IMPORTANT THING… ▸ Don’t use custom views for navigation bar. It leads to choppy UX ! ▸ Use native Navigation bar only and customise if needed ! ▸ http://www.appcoda.com/customize-navigation-status- bar-ios-7/ ▸ https://www.natashatherobot.com/navigation-bar- interactions-ios8/