Crucial iOS7 changes

crucial_iOS7_changes.md

#Key Notes from iOS7 Tech Talks Videos - Architecting Modern Apps, Part 1

A few additional more detailed talks are available at WWDC Videos

##iBeacon

• Location sensitive bluetooth
• Any existing device with iOS7 can enable iBeacon and be an iBeacon itself!
• Note: Watch What's New in Core Location
• Also, watch What's New in Passbook
  • iBeacon and Passbook have some interesting integrations

##Text kit for text management and layout

• UIKit Dynamics for more responsive UI
• Beautiful native animations that behave based on a physics engine
• Interactive vs animated transitioning

##UIViewController changes ###Extended layout

• Content underlaps navigation bars (iOS7) vs positioned below (iOS6)
• Controlled by self.edgesForExtendedLayout = UIRectEdgeAll; property
  • Setting it to UIRectEdgeNone will revert to iOS6 behavior
• Scroll views have self.automaticallyAdjustScrollViewInsets = YES; to inset content automatically to account for navigation and tab bars
• Status bars have no background (it's transparent)
  • UIStatusBarStyleDefault - black status bar on light content
  • UIStatusBarStyleLightContent - white status bar on dark content
  • Use - (UIStatusBarStyle) preferredStatusBarStyle { ... } method on a concrete per-controller basis.
• Hiding the status bar is done via - (BOOL)prefersStatusBarHidden { return YES; } method on a concrete per-controller basis.
• It's possible to animate status bars out and in via a slew of methods for cleaner transitions, if necessary

##Text Kit No UITextKit.h anywhere, part of UIKit

###Text Styles

• Referring to a font by its purpose: i.e. headline, subheadline, body, footnote, caption 1, caption 2, etc.
• Use + (UIFont *)preferredFontForTextStyle:(NSString *)style

###Dynamic Type

• Small font size, medium font size, large font size.
• Affects rendering
• Can change while the app is running!
• Listen for UIContentSizeCategoryDidChangeNotification UIContentSizeCategorySmall, UIContentSizeCategoryMedium, UIContentSizeCategoryLarge, etc.
• Does NOT affect things like navigation bar fonts
• Only affects content

###Font Descriptors

• This is crucial and absolutely key
• Should be the primary way to implement fonts in app
• Emulate dynamic type, when using custom fonts!
• The model that describes the font
• Used to describe font attributes
• Cheap to create these objects - like Font VOs :)
• Makes it easy to compose fonts
• Build compositions of fonts
  • Note: Watch Using Fonts with Text Kit